With Pump Patents (Class 303/10)
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Publication number: 20030015914Abstract: A vehicle has a hydraulic utility system for supplying a pressurized fluid to a number of user devices, including two axles, each having at least one wheel; and a brake assembly for each of the axles; a valve being provided to feed the pressurized fluid of the hydraulic system directly to one of the two brake assemblies in response to a signal from the other of the two brake assemblies.Type: ApplicationFiled: July 20, 2001Publication date: January 23, 2003Inventor: Emiliano Brancolini
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Patent number: 6499812Abstract: A method of brake pressure adjustment in a vehicle brake system equipped with an electric hydraulic pump comprises the following steps: detecting a prevailing brake pressure or determining a nominal pressure, and actuating the pump by degrees according to the detected brake pressure or the nominal pressure. In a method of opening an inlet valve of a hydraulic vehicle brake system, a pressure rise on the inlet side of the inlet valve is generated when the difference between the outlet-side and the inlet-side pressure on the inlet valve exceeds a positive threshold value.Type: GrantFiled: April 12, 2001Date of Patent: December 31, 2002Assignee: Continental Teves AG & Co., OHGInventors: Ralph Gronau, Tobias Scheller, Jürgen Woywod
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Patent number: 6491353Abstract: The precharging device is part of a hydraulic brake system of a vehicle and serves to impose brake fluid under pressure selectively on a brake assembly, by means of a charging unit. To activate the imposition of brake fluid, the charging unit is operatively connected to a fuel supply system. The charging unit is preferably embodied as a piston unit.Type: GrantFiled: June 29, 2001Date of Patent: December 10, 2002Assignee: Robert Bosch GmbHInventor: Matthias Hackl
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Publication number: 20020180258Abstract: An improved hydraulically assisted braking and steering system of a vehicle having a hydraulic pump communicating with a hydraulic steering assist device and including a hydraulic brake assist device coupled in series between the pump and the steering assist device includes the provision of a flow splitter which operates to reduce the interdependence of the hydraulic brake and steering assist devices on the flow of fluid from the pump. The flow splitter communicates with the outlet of the pump and the inlet of the brake assist device and is operative when the back pressure from the brake assist device exceeds a predetermined control value to divert a fraction of the flow of fluid around the brake assist device directly to the steering assist device, thereby providing sufficient flow to operate both the brake and steering assist devices within their normal design limits, rather than having the brake assist device starve the steering assist device when under heavy load.Type: ApplicationFiled: May 28, 2002Publication date: December 5, 2002Applicant: Delphi Technologies, Inc.Inventors: James Leroy Davison, Henry George Bean, Johnny M. Paris, Michael Alan Johnson
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Publication number: 20020162715Abstract: A hydraulic pressure intensifier for operating a vehicle braking system under conditions that are not conducive to the proper operation of a power assist for the braking system. The hydraulic pressure intensifier has an intensifier inlet fluidly connected to a master cylinder and an intensifier outlet fluidly connected to a wheel cylinder. A bypass valve has an input and output fluidly connected to the intensifier inlet and the intensifier outlet, respectively. With normal power assisted braking operation, the bypass valve is open and the master cylinder is fluidly connected to the wheel cylinder via the bypass valve. In a manual or nonpower assisted braking operation, the bypass valve is closed; and the hydraulic pressure intensifier is fluidly connected between the master cylinder and the wheel cylinder.Type: ApplicationFiled: May 1, 2001Publication date: November 7, 2002Applicant: Delphi Technologies, Inc.Inventors: Timothy A. Haerr, Gary C. Fulks
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Patent number: 6450589Abstract: A brake pressure transducer is to be provided for a hydraulic vehicle brake system that can be actuated by initiating an actuating force (FB) via an actuating element (2) in order to generate a brake pressure for at least one wheel brake (3) by reducing the volume of a hydraulic chamber (4) and that is equipped with a brake force booster (13) in order to superimpose a primary servo force (FS1) on the initiated actuating force (FB). An additional hydraulic chamber (6) is provided whose volume likewise decreases on initiating the actuating force (FB).Type: GrantFiled: December 1, 2000Date of Patent: September 17, 2002Assignee: Lucas Industries plcInventors: Werner Dieringer, Ralf Kinder
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Patent number: 6431661Abstract: A work vehicle is provided with a brake system actuated by depressing either the left pedal or the right pedal. The brake system comprises two parallel brake circuits. The first brake circuit has a first brake actuator, a first hydraulic line, a first flow regulating portion of a tandem brake valve and a first accumulator. The second brake circuit has a second brake actuator, a second hydraulic line, a second flow regulating portion of the tandem brake valve and a second accumulator. To equalize the hydraulic pressure applied to the first and second brake actuators, an equalizer hydraulic line having an orifice extends between the first and second hydraulic lines. A force feedback hydraulic circuit is hydraulically positioned between the first and second hydraulic lines. The force feedback circuit comprises a first force feedback hydraulic line, a second force feedback hydraulic line and a force feedback hydraulic actuator. The first feedback line extends between the first and second hydraulic lines.Type: GrantFiled: October 24, 2000Date of Patent: August 13, 2002Assignee: Deere & CompanyInventor: Douglas Gerard Meyer
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Publication number: 20020096406Abstract: An hydraulic brake system that rapidly and precisely slows or reduces speed by constraining or stopping the movement of a link mechanism connected between a piston and a rotational driving shaft of a power system with physical force generated due to the incompressible fluid characteristic by constraining or stopping the flow of oil filled in an hydraulic oil chamber. The hydraulic brake system includes a lubricating section for supplying the oil reserved in a protective casing to friction sliding parts of respective components through pumping movement by utilizing the reciprocal movement of a piston rod, and an oil supplement section for supplementing the hydraulic oil chamber with the oil. Accordingly, the possible abrasion of the respective friction sliding parts is constrained, and the durability is improved. Further, in the event of oil leakage, the oil is supplemented for emergency-braking, so that a possible accident can be prevented.Type: ApplicationFiled: October 2, 2001Publication date: July 25, 2002Inventor: Cheol H. Hwang
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Publication number: 20020084691Abstract: In an enabled mode of a first-fill device, if a fluid pressure in a first pressurizing chamber is lower than a predetermined value, a working fluid can be supplied to a brake cylinder from both the first pressurizing chamber and a second pressurizing chamber. If the fluid pressure in the first pressurizing chamber becomes higher than the predetermined value, the working fluid can be supplied only from the second pressurizing chamber. On the other hand, in a disabled mode of the first fill device, no matter how high the fluid pressure in the first pressurizing chamber is, the working fluid is supplied to the brake cylinder only from the second pressurizing chamber or supplied from both the first pressurizing chamber and the second pressurizing chamber.Type: ApplicationFiled: December 26, 2001Publication date: July 4, 2002Applicant: Toyota Jidosha Kabushiki KaishaInventors: Hiroshi Isono, Takayuki Yamamoto, Yasuji Mizutani
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Patent number: 6360854Abstract: An hydraulic brake system that rapidly and precisely slows or reduces speed by constraining or stopping the movement of a link mechanism connected between a piston and a rotational driving shaft of a power system with physical force generated due to the incompressible fluid characteristic by constraining or stopping the flow of oil filled in an hydraulic oil chamber. The hydraulic brake system includes a lubricating section for supplying the oil reserved in a protective casing to friction sliding parts of respective components through pumping movement by utilizing the reciprocal movement of a piston rod, and an oil supplement section for supplementing the hydraulic oil chamber with the oil. Accordingly, the possible abrasion of the respective friction sliding parts is constrained, and the durability is improved. Further, in the event of an oil leakage, the oil is supplemented for emergency-braking, so that a possible accident can be prevented.Type: GrantFiled: April 21, 2000Date of Patent: March 26, 2002Assignee: HKB Co., Ltd.Inventor: Cheol-hong Hwang
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Patent number: 6354672Abstract: A braking system including a brake cylinder, a first hydraulic pressure source having a first pump device for pressurizing a working fluid, a second hydraulic pressure source operable in response to an operation of a brake operating member, to pressurize the fluid to a pressure higher than a value corresponding to an operating force of the brake operating member, and a brake-cylinder-pressure control device operable when the brake cylinder is disconnected from the second hydraulic pressure source, to control the pressure of the fluid pressurized by the first hydraulic pressure source, such that the fluid pressure in the brake cylinder is controlled to a value determined on the basis of the operating force, and wherein an emergency communication device is operated when at least one of the brake-cylinder-pressure control device and the first pump device fails to normally function, to hold the brake cylinder in communication with the second hydraulic pressure source.Type: GrantFiled: October 3, 2000Date of Patent: March 12, 2002Assignees: Toyota Jidosha Kabushiki Kaisha, Aisin Seiki Kabushiki KaishaInventors: Eiji Nakamura, Akihiro Otomo, Fumiaki Kawahata, Tetsuya Miyazaki, Hiroshi Toda
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Patent number: 6347843Abstract: In a pump equipment having one or more rotary pumps for a hydraulic circuit, the intake port is communicated with the shaft hole for inserting the drive shaft and fluid flows through the shaft hole to a fluid groove provided in inner surfaces of the pump room for the purpose of lubrication. To prevent fluid leakage to the outside, first and second oil seals are disposed for filling the clearance between the drive shaft and the shaft hole and, preferably, a communicating conduit is provided between the first and second oil seals to transmit the fluid leaked through the first oil seal to a low pressure fluid conduit of the hydraulic circuit. In particular, in the pump equipment having plural rotary pumps, the respective discharge ports of the rotary pumps are located at the points which are nearly symmetrical with respect to the center axis of the drive shaft to counterbalance each other, the reaction forces against the drive shaft to be produced by the high pressure at the respective discharge ports.Type: GrantFiled: April 21, 1999Date of Patent: February 19, 2002Assignee: Denso CorporationInventors: Takashi Murayama, Takeshi Fuchida, Daizo Oba, Hiroyuki Shinkai, Toshiya Morikawa
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Patent number: 6345225Abstract: This invention relates to an electromechanical brake system, in particular for automotive vehicles, which includes a pedal module and at least two brake modules. Further, a central module may be provided. Connection between the aforementioned modules can be made by a data bus. The data bus is provided redundantly. In one embodiment, the central module can evaluate signals of a sensor system and examine them for their errors. Further, the central module can emit a corresponding nominal braking value which then is emitted to the brake modules. Thereupon, the brake modules determine appropriate actuating signals for the actuators which interact with the wheels in order to realize the driver's braking intention.Type: GrantFiled: August 11, 2000Date of Patent: February 5, 2002Assignee: Continental Teves AG & Co., OHGInventors: Jürgen Böhm, Stefan Stölzl, Peter Willimowski, Joachim Nell, Rainer Oehler
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Patent number: 6328388Abstract: The present invention relates to a brake actuation unit comprising a cylinder/piston arrangement which acts on at least one brake lining which can be brought into frictional engagement with a brake disk, a hydraulic pump which is hydraulically connectable with a pressure chamber of the cylinder/piston arrangement in order to move the cylinder of the cylinder/piston arrangement relative to the piston of the cylinder/piston arrangement, and a motor for driving the hydraulic pump.Type: GrantFiled: November 8, 1996Date of Patent: December 11, 2001Assignee: Lucas Industries public limited companyInventors: Kurt Mohr, Thomas Wagner
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Patent number: 6328391Abstract: A drum brake device produces a stable braking force at a predetermined boosting ratio in response to a brake operation force input thereto, even if the friction characteristics of the interface of the brake drum and the brake shoe varies, without increasing the size of the wheel cylinder.Type: GrantFiled: June 8, 1999Date of Patent: December 11, 2001Assignee: Akebono Brake Industry Co., Ltd.Inventors: Yukio Iwata, Hiroo Kobayashi, Toshifumi Maehara
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Patent number: 6315369Abstract: A hydraulically operated braking system including a hydraulic pump operated by an electric motor, and a motor control device connected to the electric motor and controlling an electric current to be applied to the electric motor, by pulse width modulation, such that a PWM frequency at which the electric current is controlled by the pulse width modulation is set at a relatively high value higher than an upper audibility limit while the braking system is placed in a normal braking operation during which the generation of an operating noise of the braking system is not allowed, and at a relatively low value not higher than the upper audibility limit while the braking system is placed in a noise-tolerable braking operation during which the generation of the operating noise is allowed.Type: GrantFiled: November 8, 1999Date of Patent: November 13, 2001Assignee: Toyota Jidosha Kabushiki KaishaInventor: Masanori Hirose
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Patent number: 6299260Abstract: A method of controlling a pump in a brake system of a motor vehicle, in particular an electrohydraulic brake system, is described, where the pump can be controlled by a pump motor either uncycled or continuously and cycled, where the period of uncycled control and/or an initial pulse-pulse pause ratio at the start of cycled control can be varied as a function of a voltage applied to the pump motor before and/or at the start of and/or during uncycled control and/or as a function of an on-board voltage of the motor vehicle determined before and/or at the start of and/or during uncycled control.Type: GrantFiled: March 30, 2000Date of Patent: October 9, 2001Assignee: Robert Bosch GmbHInventor: Juergen Hachtel
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Publication number: 20010023799Abstract: A parking brake system for a motor vehicle has a control for activating the parking brake, an electrical parking brake control unit for controlling braking devices which are assigned to the parking brake, a brake booster function control unit for controlling brake booster functions which promote traveling comfort and safety. When the control is activated at a vehicle velocity above a predefined minimum velocity, the braking devices assigned to the service brake are controlled by the brake booster function control unit.Type: ApplicationFiled: February 15, 2001Publication date: September 27, 2001Inventor: Willibald Engelhard
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Patent number: 6290307Abstract: A braking system (10) with a master cylinder (12) which comprises at least one cylinder/piston arrangement (14, 16) which can be actuated by a brake pedal (18) for supplying hydraulic fluid to at least one brake circuit (22, 24) is characterized by a controllable pressure source (54, 78, 90, 92) which, under the control of an electronic control unit ECU subjects the piston (16) of the cylinder/piston arrangement (14, 16) in the sense of supplying hydraulic fluid to the brake circuit (22, 24).Type: GrantFiled: May 13, 1998Date of Patent: September 18, 2001Assignee: Lucas Industries Public Limited CompanyInventors: Gregor Poertzgen, Kurt Mohr
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Patent number: 6280006Abstract: A brake hydraulic control device for use in a vehicle, includes: a master cylinder with a first reservoir attached thereto; a second reservoir different from the first reservoir; a drive wheel control valve unit switching communication and cut-off between a drive wheel brake and the master cylinder as well as communication and cut-off between the drive wheel brake and the second reservoir; a driven wheel control valve unit switching communication and cut-off between a driven wheel brake and the master cylinder as well as communication and cut-off between the driven wheel brake and the second reservoir; and a pump having a discharge port connected between the drive wheel control valve unit and the drive wheel brake, and a suction port connected to the master cylinder through an open/close switch valve and to the said second reservoir.Type: GrantFiled: July 20, 1999Date of Patent: August 28, 2001Assignee: Nissin Kogyo Co., Ltd.Inventors: Masashi Kobayashi, Ryouji Yamazaki
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Patent number: 6280002Abstract: A hydraulic brake system wherein a portion of a volume of a first fluid supplied to a steering system by a pump is selectively diverted to an actuator assembly for a master cylinder to develop an force for actuating a master cylinder to pressurize fluid which is supplied to wheel brakes. An electronic control unit (ECU) for the brake system receives a first input signal indicative of the flow of fluid from the pump in the steering system, a second input signal indicative of the input force applied by the operator and a third input signal indicative of the speed of the wheels of the vehicle for developing a pulse modulated operational signal. The electronic control develops an operational signal which is supplied as the pulse modulated operational signal to a magnetic responsive valve. The pulse modulated operational signal creates a variable orifice in the magnetic responsive valve to restrict the flow of the first fluid to the steering gear and increases the fluid pressure of the first fluid.Type: GrantFiled: January 28, 2000Date of Patent: August 28, 2001Assignee: Robert Bosch CorporationInventors: Gregory Paul Goodzey, Bryan Frances Heinz, Timothy Jay Albert
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Patent number: 6264287Abstract: A hydraulic brake apparatus for a vehicle includes a first hydraulic passage for supplying pressurized brake fluid from a master cylinder to wheel brakes without passing through a hydraulic pump, a first opening and closing electromagnetic valve interposed in the first hydraulic passage for opening and closing the first hydraulic passage, a second hydraulic passage for supplying brake fluid from the master cylinder to the suction side of the hydraulic pump, and a second opening and closing electromagnetic valve interposed in the second hydraulic passage for opening and closing the second hydraulic passage. A passage cross sectional adjusting valve is interposed in the second hydraulic passage and decreases the passage cross sectional area of the second hydraulic passage to suppress the transmission of a hydraulic pulsation generated in a suction side of the hydraulic pump to the master cylinder when the brake pedal is depressed.Type: GrantFiled: April 22, 1999Date of Patent: July 24, 2001Assignee: Aisin Seiki Kabushiki KaishaInventor: Yasuhito Sekihara
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Publication number: 20010005100Abstract: A brake system includes first brake assist means arranged in a first brake circuit to increase a first wheel cylinder pressure to a level higher than a master cylinder pressure. The brake system further includes second brake assist means arranged in a second brake circuit to increase a second wheel cylinder pressure to a level higher than the master cylinder pressure. The second brake assist means includes a brake regulator mechanism that uses the increased first wheel cylinder pressure as a pilot pressure and adjusts the increased second wheel cylinder pressure to a pressure falling within a predetermined range from the increased first wheel cylinder pressure when the first brake assist means is activated.Type: ApplicationFiled: December 22, 2000Publication date: June 28, 2001Inventor: Masahiko Kamiya
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Publication number: 20010002767Abstract: A brake pressure transducer is to be provided for a hydraulic vehicle brake system that can be actuated by initiating an actuating force (FB) via an actuating element (2) in order to generate a brake pressure for at least one wheel brake (3) by reducing the volume of a hydraulic chamber (4) and that is equipped with a brake force booster (13) in order to superimpose a primary servo force (FS1) on the initiated actuating force (FB), which brake pressure transducer can be produced in a more compact form and at a lower cost expenditure and can be actuated comfortably.Type: ApplicationFiled: December 1, 2000Publication date: June 7, 2001Inventors: Werner Dieringer, Ralf Kinder
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Patent number: 6226586Abstract: A brake control system determines utilizes a sensed amount of brake travel and a sensed amount of master cylinder pressure in determining a base brake control signal for an electro-hydraulic brake management system. The system also provides a springer function to provide an appropriate amount of brake jump-in, based on vehicle velocity and pedal travel. For pure brake-by-wire systems that have no hydraulic components, brake force is substituted for master cylinder pressure in determining a base brake control signal.Type: GrantFiled: August 24, 1999Date of Patent: May 1, 2001Assignee: Kelsey-Hayes CompanyInventors: Mark S. Luckevich, Andrew W. Kingston
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Fluid pressure generating system for a vehicle and brake fluid pressure control system for a vehicle
Patent number: 6224168Abstract: A fluid pressure generating system for a vehicle has a reservoir that stores brake fluid, a fluid pump that pressurizes the brake fluid, an accumulator that accumulates brake fluid pressurized by the fluid pump, and a pressure switch that detects a pressure value in the accumulator. A warning device is adapted to be operated in response to the pressure switch, and a mechanism is provided for detecting a stop of the vehicle. A warning suspending device controls the warning device by using a signal from the pressure switch and a signal from the device for detecting a stop of said vehicle.Type: GrantFiled: March 10, 1999Date of Patent: May 1, 2001Assignee: Aisin Seiki Kabushiki KaishaInventor: Satoshi Yamada -
Patent number: 6199958Abstract: The present invention relates to a hydraulic unit for an automotive vehicle brake system according to the recirculation principle, wherein each brake system in the area of the hydraulic unit includes a prefilling location which opens into the pump suction conduit to take up brake fluid. Thus, filling of the hydraulic unit can be simplified by prefilling of the secondary circuit in the vehicle.Type: GrantFiled: September 29, 1999Date of Patent: March 13, 2001Assignee: Continental Teves AG & Co., OHGInventor: Martin Baechle
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Patent number: 6199962Abstract: A hydraulic control unit of a vehicular brake system includes a housing having a cavity. Drive means is received in the cavity of the housing. A fluid supply source is in fluid communication with the housing. A piston slidably is disposed in the housing. The piston includes a first end and a second end wherein the second end is in contact with the drive means so that the piston moves from a bottom-dead-center position to a top-dead-center position. Biasing means is in contact with the first end of the piston so that the piston moves from a top-dead-center position to the bottom-dead-center position. A first variable-volume chamber is defined by the piston and the housing whereby fluid is transferred from the first variable-volume chamber when the piston moves from the bottom-dead-center position.Type: GrantFiled: June 24, 1999Date of Patent: March 13, 2001Assignee: Kelsey-Hayes CompanyInventors: David M. Dokas, Blaise J. Ganzel
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Patent number: 6195995Abstract: Hydraulic Brake System with a Device for Active Braking In order to enable a hydraulic brake system which has a self-priming return pump (14) to quickly fill the wheel brakes (5) in an active braking operation, the present invention discloses the provision of a pressure-volume converter (20) on the pressure side of the return pump (14). The converter (20) causes a large pressure fluid volume to be conducted into the brake line (4) to the wheel brake (5) concerned at a small delivery volume of the return pump (14). This is possible because a return pump can generate high pressure and, thus, produce a sufficient amount of force to displace a stepped piston which can then displace a large quantity of pressure fluid. To permit the development of a sufficient back pressure on the pressure side of the return pump (14), a pilot pressure non-return valve (19) is arranged in the pressure line (18) which extends in parallel to the pressure-volume converter (20).Type: GrantFiled: April 16, 1999Date of Patent: March 6, 2001Assignee: ITT Manufacturing Enterprises, Inc.Inventor: Thomas Bartsch
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Patent number: 6196641Abstract: A fluid pressure boosting device of the present invention performs jumping action at a higher servo ratio until fluid pressure in a power chamber (25) reaches a first predetermined value and a rear end (20e) of a reaction piston (20)comes in contact with a step of an input shaft (18). Since a switching valve is set in a first position I until the fluid pressure in the power chamber (25) reaches a second predetermined pressure, a reaction chamber (41) is connected to the reservoir (33) so as to be at atmospheric pressure. In this state, the normal brake control at a lower servo ratio is performed. As the fluid pressure in the power chamber (25) reaches a second predetermined value, the switching valve is set in a second position II by the fluid pressure so that the pressurized fluid in the power chamber is introduced into the reaction chamber (41). The fluid pressure in the reaction chamber 41 acts on the step between the reaction piston (20) and the input shaft (18) so that the servo ratio becomes higher.Type: GrantFiled: October 29, 1998Date of Patent: March 6, 2001Assignees: Bosch Braking Systems Co., Ltd., Denso CorporationInventors: Hiroyuki Oka, Michio Kobayashi, Masahiro Shimada, Satoru Watanabe, Junichi Hirayama, Mamoru Sawada, Yuzo Imoto
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Patent number: 6193329Abstract: A motor is secured to a housing by securing bolts. These bolts are threaded into screw-threaded holes formed in the housing so as to be parallel to an axis of rotation of a motor driven shaft, which drives radially reciprocal plungers that are disposed in diametrically opposed pump bores located on either side of the shaft. The screw-threaded holes are arranged close to, but offset from, the pump bores so that extrapolations of the screw-threaded holes do not intersect the pump bores or cavities in which pressure pulsation dampers or reservoirs are defined, enabling the housing to be small and low in vibration and noise.Type: GrantFiled: December 11, 1998Date of Patent: February 27, 2001Assignee: Unisia Jecs CorporationInventor: Koji Kanauchi
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Patent number: 6183050Abstract: A brake system including a master cylinder for generating pressurized fluid, a wheel brake in fluid communication with the master cylinder, and a first valve for regulating the flow of fluid between the master cylinder and the wheel brake. The brake system further includes a pedal travel simulator including a housing having a bore formed therein. A piston is slidably disposed in the bore. The piston and the housing generally defining a fluid chamber which is in fluid communication with the master cylinder. The pedal travel simulator further includes a spring which biases the piston in a direction so as to contract the fluid chamber. The brake system further includes a source of pressurized fluid and a boost valve which is in fluid communication with the source of pressurized fluid and the wheel brake.Type: GrantFiled: December 29, 1999Date of Patent: February 6, 2001Assignee: Kelsey-Hayes CompanyInventor: Blaise J. Ganzel
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Patent number: 6179389Abstract: A system generates a brake pressure with a pump which delivers a volume into the chamber of a master brake cylinder and builds up a pressure which is used by at least one additional assembly, particularly a power-assisted steering system. The system has at least one distributing and throttling element for admitting a definable pressure to the chamber of the master brake cylinder and/or the additional assembly. The one or more distributing and throttling elements can be triggered, as a function of the brake pedal position and/or of driving condition values and/or of operating values of the vehicle, such that the chamber and/or the additional unit can be acted upon by a pump generated adjustable pressure.Type: GrantFiled: June 7, 1999Date of Patent: January 30, 2001Assignees: DaimlerChrysler AG, MOOG GmbHInventors: Rainer Freitag, Armin M{umlaut over (u)}ller, Harry Tröster, Michael Duvenbeck, Franz Ringer
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Patent number: 6174033Abstract: A method and a device which are used for forming and/or adapting a driving signal of an arrangement for delivering a pressurized medium in a braking system. The driving signal, in particular, of a pump of a braking system, is a function of at least one driving signal and/or the formation of the driving signal of a shut-off device, in particular, of at least one valve, for the inlet and/or outlet and/or passage of the pressurized medium. A delivery rate of the pump is adapted in a manner compatible with the situation, including the valve position resulting from the driving signal and/or its formation and/or the prevailing pressure ratios.Type: GrantFiled: May 6, 1999Date of Patent: January 16, 2001Assignee: Robert Bosch GmbHInventors: Gerd Busch, Manfred Gerdes
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Patent number: 6170921Abstract: An actuation system includes a magnetostrictive pump assembly to operate a fluid ram such as a brake cylinder connected to an actuator such as a brake. A first accumulator is connected to an input of the fluid ram to store a fluid which actuates the fluid ram. A second accumulator is similarly connected to an output of the fluid ram to receive the used fluid after actuation of the fluid ram. The magnetostrictive pump assembly is connected between the first accumulator and second accumulator, to transfer the fluid from the second accumulator to the first accumulator such that the fluid is maintained at a high pressure for activation of the fluid ram. As the magnetostrictive pump assembly reacts essentially instantaneously, any delay between actuation or deactivation is practically eliminated. Further, although the displacement of the pump is relatively small, it can be cycled at extremely high frequencies to provide substantial pumping capacity for immediate brake activation.Type: GrantFiled: January 21, 1999Date of Patent: January 9, 2001Assignee: Meritor Heavy Vehicle Systems, LLCInventor: Yngve Naerheim
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Patent number: 6168245Abstract: The brake system has at least one brake circuit (I), in which a high-pressure pump is disposed. A self-aspirating charge pump is also provided, which is connected at least indirectly to the intake side of the high-pressure pump by an intake line of a supply container for brake fluid and by a pressure line. In the event of an inadequate supply of brake fluid by the charge pump, the pumping of air into the brake circuit (I) is intended to be precluded. To that end, a siphon is disposed in the intake line of the charge pump. Air aspirated by the siphon suddenly prevents pumping by the charge pump. The brake system is intended for use in motor vehicles with slip control or for automatic brakes.Type: GrantFiled: November 13, 1998Date of Patent: January 2, 2001Assignee: Robert Bosch GmbHInventors: Heinz Siegel, Arnold Pahl, Rolf Hummel, Guenter Krenz, Erika Mank, Rolf Stotz
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Patent number: 6164731Abstract: An automotive brake system comprises a sump fluidly disposed in a housing, constructing a brake unit, and in the middle of a suction circuit of a pressure apply device including at least a pressure apply pump. During vehicle dynamics control or during vehicle stability control, the pressure apply rapidly sucks the brake fluid stored in the sump and quickly performs a pressure apply action, irrespective of the distance between the brake unit and a brake-fluid source. This ensures a smooth brake-fluid supply to the suction circuit of a return pump returning the brake fluid from the wheel-brake cylinder to the brake circuit upstream of a fluid-pressure control valve unit.Type: GrantFiled: July 17, 1998Date of Patent: December 26, 2000Assignee: Unisia Jecs CorporationInventors: Chiharu Nakazawa, Yukinori Otsuka, Yukio Sudo
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Patent number: 6135577Abstract: In a pump operation control apparatus for a hydraulic brake boosting system, an ECU 13 is provided with a timer 16 to which an output signal from a brake switch 12 is supplied and a pump-operation-control-signal generating means 17 for transmitting a signal for operating and controlling a motor 9 in response to an output signal from the timer 16. When the brake switch 12 has been switched on, the operation of the pump is started. After predetermined time T has elapsed from a moment at which the brake switch 12 has been switched on, the operation of the pump is interrupted. If the brake switch 12 is continuously switched on after the predetermined time T has elapsed, the pump is operated for time elongated from the predetermined time T until the brake switch 12 is switched off. If the brake switch 12 is again switched on before the predetermined time T elapses, the pump is operated until the predetermined time T elapses from the moment at which the brake switch 12 has again been switched on.Type: GrantFiled: June 25, 1998Date of Patent: October 24, 2000Assignee: Jidosha Kiki Co., Ltd.Inventor: Tomoyuki Ishii
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Patent number: 6135572Abstract: An actuation unit for an electronically controlled hydraulic vehicle braking system, comprising a brake booster which can be actuated by a brake pedal and which comprises a master cylinder and a reservoir for hydraulic fluid, a first brake which is coupled with at least a first vehicle wheel and which is connectable with the master cylinder via an electronically controlled valve arrangement in a basic position or, in an actuation position is disconnectable from same, a brake pedal behaviour simulator which is connectable with the master cylinder and comprises a spring arrangement adapted to act against the hydraulic pressure from the master cylinder, and with which a characteristics modeling is associated.Type: GrantFiled: March 18, 1999Date of Patent: October 24, 2000Assignees: Varity GmbH, Lucas Industries plcInventors: Karl-Friedrich Worsdorfer, Gregor Poertzgen, Andrew Kingston, Thomas Weigert
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Patent number: 6135579Abstract: The present invention relates to a hydraulic automotive vehicle brake system with wheel slip control, in particular for driving dynamics control, including at least one pump and pressure modulation valves in the brake lines to control the wheel braking pressure, wherein the suction side of the pump is directly, or indirectly via the pressure modulation valves, connected hydraulically to a braking pressure generator. A diaphragm is interposed into the hydraulic connection between the braking pressure generator and the suction side of the pump and contributes to reducing the load on the sealing ring at the pump piston.Type: GrantFiled: June 25, 1999Date of Patent: October 24, 2000Assignee: Continental Teves AG & Co. OHGInventor: Erhard Beck
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Patent number: 6132013Abstract: A vehicular anti-lock and traction control braking system includes a master cylinder. A driven wheel brake is connected to the master cylinder via a first brake conduit. A non-driven wheel brake is connected to the master cylinder via a second brake conduit. A fluid supply is connected to an input of a pump. An output of the pump provides pressurized fluid to the driven and non-driven wheel brakes. A pump supply valve is disposed between the pump inlet and the fluid supply. A driven wheel isolation valve is disposed in the first brake conduit between the driven wheel brake and the master cylinder. The driven wheel isolation valve is opened to allow fluid communication between driven wheel brake and the master cylinder and closed to prevent fluid communication therebetween. A non-driven wheel isolation valve is disposed in the second brake conduit between the non-driven wheel brake and the master cylinder.Type: GrantFiled: September 25, 1997Date of Patent: October 17, 2000Assignee: Kelsey-Hayes Co.Inventor: Blaise J. Ganzel
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Patent number: 6126249Abstract: A brake pressure control system is proposed which operates on the fluid-return principle. This system includes a low pressure accumulator which must be emptied upon termination of a braking operation with brake pressure control. In this way, the emptying period is kept as short as possible. To this end, the pump is driven for a defined period. In this emptying period, the motor is controlled by pulse-width modulation, and the electromotive counterforce is measured in the phases of the control signal in which no voltage is applied to the motor. This counterforce is a standard of the rotational speed of the motor or the rotational speed of the connected pump. When the rotational speed or the rotational speed variation exceeds a given value, this can be considered as an indication that the low pressure accumulator is empty. As soon as such a signal appears, the emptying period is terminated by deactivation of the motor.Type: GrantFiled: April 19, 1999Date of Patent: October 3, 2000Assignee: ITT Manufacturing Enterprises, Inc.Inventor: Andreas Kohl
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Patent number: 6109879Abstract: A fluid pressure source apparatus includes a pump, an accumulator for receiving pressure from the pump, a pressure switch for detecting the pressure in the accumulator, an electric motor for driving the pump, and a motor control device for driving the motor when the pressure switch detects a low pressure. A current detecting device detects a motor current value of the motor and a control unit determines whether the accumulator or the motor is experiencing an abnormality based on the motor current value. The control unit determines whether the motor current value occurring during a first set time following the start of driving of the motor is greater than a first set value. If the motor current value is not greater than the first set value, the control unit determines that the current detecting device is experiencing an abnormality. If there is no such abnormality information, the control unit compares the motor current value with predetermined values.Type: GrantFiled: November 20, 1997Date of Patent: August 29, 2000Assignee: Aisin Seiki Kabushiki KaishaInventors: Satoshi Yamada, Hiroshi Nakashima, Shinsuke Sakane
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Patent number: 6106080Abstract: The present invention is directed to a brake control system for a vehicle, which includes a master cylinder for pressurizing the brake fluid to discharge a master cylinder pressure in response to depression of a brake pedal, a modulator disposed between the master cylinder and a wheel brake cylinder for selecting a pressure control mode out of rapid pressure increase, pulse pressure increase, pulse pressure decrease, rapid pressure decrease and hold modes, a hydraulic pressure pump for discharging the pressurized brake fluid to the wheel brake cylinder through the modulator, and a reservoir for storing the brake fluid drained from the wheel brake cylinder through the modulator. A normally open first switching valve is disposed between the master cylinder and the modulator, and a normally closed second switching valve is disposed between the master cylinder and an inlet of the pressure pump.Type: GrantFiled: August 25, 1998Date of Patent: August 22, 2000Assignee: Aisin Seiki Kabushiki KaishaInventors: Kenji Tozu, Takayuki Itoh, Norio Yamazaki, Satoshi Yokoyama
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Patent number: 6102490Abstract: Disclosed is a braking system of an automobile, which can produce and store an electric power by means of the energy generated when the automobile is braked, thereby increasing efficiency in energy use, and simultaneously which can perform an anti-lock braking function and a traction control function. In the braking system, a master cylinder generates a hydraulic pressure when the brake pedal is pressed. A variably exhausting pump unit performs a pumping operation by the hydraulic pressure from the master cylinder. A control section senses a traveling state of the automobile and controls so that a proper braking force is applied to a wheel of the automobile. A flow control valve providing the variably exhausting pump unit with the braking force. A generating section generates electricity by means of a bypassed hydraulic pressure according to the order of the control section.Type: GrantFiled: November 17, 1997Date of Patent: August 15, 2000Assignee: Mando Machinery CorporationInventor: Chang-Bok Ko
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Patent number: 6089678Abstract: In a hydraulic braking system, during normal service braking, the output from a master cylinder (3) is disabled and a brake (12) is applied from a high pressure hydraulic source (24) under the control of electric control means (30) including a solenoid operated actuator (6) responsive to electrical signals from a transducer (2) associated with the pedal (1), and upon failure of the electrical control means a direct flow path is defined between the master cylinder (3) and the brake (12) and through which the brake can be applied from the master cylinder by movement of the pedal in the "push through" mode.Type: GrantFiled: May 16, 1997Date of Patent: July 18, 2000Assignee: Lucas Industries Public Limited CompanyInventor: Ivan Mortimer
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Patent number: 6079799Abstract: A brake system has wheel cylinders for producing a braking force in wheels using pressurized brake fluid transmitted through a main conduit from a master cylinder, a reservoir for storing brake fluid, a sideslip preventing device for when a sideslip state of the vehicle is detected supplying brake fluid to the wheel cylinder corresponding to a sideslip controlled wheel and producing a braking force in the sideslip controlled wheel, a first conduit used for supplying brake fluid from the reservoir to the wheel cylinders by the pump and a first valve for switching this first conduit between an open state and a closed state. The sideslip preventing device, when the sideslip state is detected during non-braking of the vehicle, makes the first valve open-state and thereby conducts supply of brake fluid through the first conduit from the reservoir to the wheel cylinder by a pump.Type: GrantFiled: December 23, 1997Date of Patent: June 27, 2000Assignee: Denso CorporationInventors: Mamoru Sawada, Kazuya Maki, Hiroaki Niino, Masaki Tate, Yuzo Imoto
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Patent number: 6074018Abstract: The invention is based on a dual-circuit anti-lock vehicle brake system (10) with a tandem master cylinder (12), a switchover valve (14) following the latter, a brake pressure modulation valve assembly (18, 20) that has a brake pressure buildup valve (18) and a brake pressure reduction valve (20) for each wheel brake cylinder (16), and a return pump (24). To enable building up brake pressure rapidly for vehicle dynamics control, the invention proposes one additional pump (28) in each brake circuit (I, II), whose intake side is connected directly to the master cylinder (12) and which feeds in the direction of the wheel brake cylinders (16) connected to to this brake circuit (I, II). As a result, a brake pressure buildup is possible in each wheel brake cylinder (16), even when the master cylinder (12) is not actuated, which buildup can be modulated for individual wheels in a manner known per se.Type: GrantFiled: August 14, 1998Date of Patent: June 13, 2000Assignee: Robert Bosch GmbHInventors: Peter Zeiner, Jurgen Breitenbacher, Hans-Jorg Wolff, Rainer Heinsohn, Andreas Klug, Hermann Kaess, Karl-Heinz Willmann
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Patent number: 6068351Abstract: In a braking axle driven by a wheel of a trailer vehicle, wherein an axle-driven pumping mechnism is used to pressurize a volume of hydraulic fluid in response to a braking command, the fluid pressure activates a turbine which in turn drives a cooling fan aimed at a radiator used to dissipate the heat accumulating into the hydraulic fluid. The coaxially circular arrangement of the pumps, control valves and other components of the system yields a simple, efficient and sturdy mechanical structure that can withstand very high internal fluid pressure with a limited and controllable leakage rate.Type: GrantFiled: August 3, 1999Date of Patent: May 30, 2000Inventor: Jose Luis Martin-Gerez
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Patent number: 6030055Abstract: A method and device for regulating the pressure in at least one wheel brake, such that a controller is provided for pressure regulation which forms at least one activation signal magnitude for a pressure-influencing valve arrangement on the basis of, among other things, a stored correlation between the activation signal magnitude and the pressure conditions at the valve arrangement. The method and device allow for the correlation to be adapted to changes to the braking system during operation.Type: GrantFiled: February 25, 1998Date of Patent: February 29, 2000Assignee: Robert Bosch GmbHInventor: Michael Schubert