Including Pneumatic Power Booster Patents (Class 303/114.3)
  • Patent number: 7537294
    Abstract: In a method of controlling a hydraulic vehicle brake system with active hydraulic brake force boosting, wherein the driver can introduce brake pressure into a master brake cylinder with an actuating device, wherein the pressure introduced by the driver is boosted by an active hydraulic pressure increasing unit, a braking request or a suspected braking request of the driver is determined and, when a braking request or a suspected braking request of the driver is detected, a separating valve that is arranged in a line connecting the master brake cylinder and the hydraulic pressure increasing unit is opened or remains open and the pressure increasing unit is actuated for pressure generation purposes.
    Type: Grant
    Filed: April 28, 2003
    Date of Patent: May 26, 2009
    Assignee: Continental Teves AG & Co. oHG
    Inventors: Helmut Fennel, Thomas Sticher
  • Patent number: 7530646
    Abstract: Master cylinder assembly (1) for hydraulic control includes a master cylinder body (2) having a longitudinal bore (3). A piston (6) is arranged in the said bore and includes a seal packing (15) separating two chambers (16, 29) adapted to contain a liquid. The piston also includes a recovery conduit (36) connecting the chambers and by-passes the seal packing, and a valve (38). When the piston is in a rest position, an actuator (54) adjusts the position of the valve between an open position opening the recovery conduit and a closed position closing the recovery conduit.
    Type: Grant
    Filed: February 7, 2006
    Date of Patent: May 12, 2009
    Assignee: Delphi Technologies, Inc.
    Inventors: Jacques Loche, Philippe Georges Castel
  • Publication number: 20090115245
    Abstract: The invention relates to a brake booster with a short operating travel, in which the three-way valve comprises a mobile valve seat borne by a sleeve (54). The movement of this sleeve is controlled by the piston. According to the invention, there is an elastic device (70) applying force to the sleeve (54) in the direction of the front of the booster, and tending to move this sleeve forward with respect to the pneumatic piston (12). In addition, there is a device for transmitting the pressure of the master cylinder (120) to the sleeve (54) and that tends to apply a rearward force to the sleeve (54).
    Type: Application
    Filed: November 6, 2008
    Publication date: May 7, 2009
    Applicant: ROBERT BOSCH GMBH
    Inventor: Jean-Marc Attard
  • Patent number: 7475951
    Abstract: A control system for a brake vacuum pump, the system being capable of accumulating a negative pressure required for a vacuum chamber, without excessively operating the vacuum pump. In this system, an EGI_ECU determines whether a vehicle has experienced running at a speed equal to or higher than a preset creep vehicle speed after the startup of an engine. The EGI_ECU prohibits the operation of the vacuum pump until the time when the vehicle experiences running at a speed equal to or higher than the creep vehicle speed. Thereby, in a situation obviously not requiring a strong braking force, such as in a stopped state immediately after the startup of the engine, the operation of the vacuum pump can be prohibited, which allows the vacuum pump to be accurately prevented from an unnecessary drive.
    Type: Grant
    Filed: January 17, 2006
    Date of Patent: January 13, 2009
    Assignee: Fuji Jukogyo Kabushiki Kaisha
    Inventor: Katsufumi Ichikawa
  • Patent number: 7472968
    Abstract: In a vacuum type brake booster, the reaction of output transmitted from an output shaft to a reaction member is transmitted to a valve body, a plunger, and a stepped pin. A valve mechanism, which is assembled to an axial hole of the valve body, includes an atmospheric valve seat which advances and retreats together with the plunger, a vacuum valve seat assembled to the valve body to advance and retreat, and a valve member having an atmospheric valve portion which forms an atmospheric valve in cooperation with the atmospheric valve seat and a vacuum valve portion which forms a vacuum valve in cooperation with the vacuum valve seat. The stepped pin is pushed rearward when a corresponding portion of the rear surface of the reaction member deforms and bulges rearward, and pushes the vacuum valve seat rearward in relation to the valve body.
    Type: Grant
    Filed: June 26, 2006
    Date of Patent: January 6, 2009
    Assignee: Advics Co., Ltd.
    Inventors: Kaoru Tsubouchi, Koichi Hashida
  • Patent number: 7431407
    Abstract: A vehicle brake device A is provided with a master cylinder 10 for generating a fluid pressure depending on the stepping state of a brake pedal 11 and a differential pressure control valve 43 constituted by a solenoid valve of the type that has two ports 43a, 43b and is capable of controlling the differential pressure between the both ports 43a and 43b. The differential pressure control valve 43 is connected at its port 43a to an outlet port 10a of the master cylinder 10. An ECU 70 controls the differential pressure control valve 43 to generate a controlled differential pressure corresponding to the pedal operation state of the brake pedal 11 between the both ports 43a and 43b. Thus, according to the vehicle brake device A, it can be realized to obtain a pedal feeling which is smooth without suffering any delay in response, to easily alter a reaction force property of the brake pedal for any of various vehicle models, and to decrease in cost as well as dimension.
    Type: Grant
    Filed: December 22, 2004
    Date of Patent: October 7, 2008
    Assignee: Advics Co., Ltd.
    Inventors: Masahiko Kamiya, Taro Segawa, Takaaki Matsuhashi
  • Publication number: 20080238189
    Abstract: A system for vacuum booster assist including a vacuum booster having an input and an output, a brake pedal connected to the input of the vacuum booster, a brake pedal travel sensor positioned to monitor travel of the brake pedal, a master cylinder having an input and an output, the input of the master cylinder being connected to the output of the vacuum booster, a master cylinder pressure sensor connection to the master cylinder to monitor a fluid pressure in the master cylinder, a brake fluid pressurizing device in fluid communication with the output of the master cylinder, and a controller in communication with the brake pedal travel sensor, the master cylinder pressure sensor and the brake fluid pressurizing device, wherein the controller is adapted to communicate a command signal to the brake fluid pressurizing device based upon signals received from the brake pedal travel sensor and the master cylinder pressure sensor.
    Type: Application
    Filed: March 27, 2007
    Publication date: October 2, 2008
    Inventors: Ching-Chuang G. Kuo, Deron C. Littlejohn
  • Patent number: 7419227
    Abstract: A braking device for a motor vehicle having a first brake circuit (10) with a master cylinder (11) controlled by a brake pedal (12), a second brake circuit (20) with at least one pump (27) that is controlled by a computer (C), and a pedal travel simulation mechanism (40). The simulation mechanism (40) includes a solenoid valve (41) that is mounted in a pipe (42) connected to a hydraulic fluid storage chamber (43) and controlled by the computer (C) so as to allow the brake fluid to flow toward the chamber (43) when the second brake circuit (20) is active and when the driver presses on the brake pedal. The pipe (42) is also connected to another pipe (44) in which hydraulic fluid is displaced by a first part (45) of a control rod connected to the brake pedal (12) and second part (46) associated with the master cylinder (11).
    Type: Grant
    Filed: September 8, 2005
    Date of Patent: September 2, 2008
    Assignee: Robert Bosch GmbH
    Inventors: Nicolas Marlhe, Christophe Leboube, Etienne Durand, Jean-Marc Piel
  • Publication number: 20080164753
    Abstract: A method for providing brake boosting in a hybrid motor vehicle having a brake boosting system powered by an internal combustion engine and by an auxiliary brake boosting device includes monitoring the output of an auxiliary brake boosting device not driven by the engine, and in the event that the auxiliary brake boosting device is not operating properly, starting the internal combustion engine associated with the vehicle to provide a desired level of brake boost.
    Type: Application
    Filed: January 8, 2007
    Publication date: July 10, 2008
    Applicant: Ford Global Technologies, LLC
    Inventors: Dale Crombez, Daniel Gabor, Peter Worrel, William David Treharne
  • Publication number: 20070284937
    Abstract: In a brake system for a hybrid motor vehicle, while it is set to pure electric drive mode, the crankshaft of the combustion engine is driven temporarily with the aid of at least one electric motor for generating reduced pressure in the intake manifold for supplying reduced pressure of the additional vacuum reservoir to the vacuum chamber of its brake booster only when, during or following the single or multiple actuation of the brake pedal thereof, the reduced pressure in the vacuum reservoir of the brake booster drops to a predeterminable lower limit or falls below the lower limit.
    Type: Application
    Filed: June 13, 2007
    Publication date: December 13, 2007
    Inventors: Mathias Deiml, Florian Gutknecht-Stohr, Roland Herfurth, Frank Hofel, Wei-Lung Lee, Martin Rampeltshammer, Matthias Tons
  • Publication number: 20070236083
    Abstract: A negative pressure supply apparatus for brake booster, arranged to supply an intake-pipe negative pressure in an engine intake system to a brake booster mounted in a vehicle, comprises a negative pressure supply part communicated with a bypass passage which allows part of air flowing in the intake pipe to bypass the intake pipe and supplies the intake-pipe negative pressure to the brake booster; an air ejector part placed in the bypass passage to increase the intake-pipe negative pressure and supply the increased negative pressure to the brake booster; and an open/close device including a temperature-sensitive medium, the device being placed in the bypass passage upstream of the air ejector part and configured to open and close the bypass passage.
    Type: Application
    Filed: March 20, 2007
    Publication date: October 11, 2007
    Applicant: AISAN KOGYO KABUSHIKI KAISHA
    Inventors: Yutaka Kawamori, Sunao Kitamura, Yoshiki Ito, Kiyoshi Tsukiji
  • Patent number: 7267412
    Abstract: In a method for determining or calibrating the brake control characteristic of a vacuum brake booster of a vehicle brake system, the pressure in the working chamber or the pressure difference between the working chamber and the vacuum chamber of the vacuum brake booster is determined, and either the brake control characteristic is determined on the basis of the determined pressure or pressure difference of the vacuum brake booster, or the stored brake control characteristic is changed according to the determined pressure or pressure difference.
    Type: Grant
    Filed: December 3, 2002
    Date of Patent: September 11, 2007
    Assignee: Continental Teves AG & Co. oHG
    Inventors: Ralph Gronau, Ralf Reviol, Tobias Scheller, Andreas Neu
  • Patent number: 7255408
    Abstract: A vacuum booster which moderates a retraction speed of a valve seat member to restrain a contact noise between a key member retracting in a unitary manner with the valve seat member and a flange surface of a plunger. The vacuum booster includes a noise restriction device.
    Type: Grant
    Filed: October 26, 2005
    Date of Patent: August 14, 2007
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Akihiko Miwa, Kaoru Tsubouchi, Nobuyuki Hirota, Tomoyasu Sakai
  • Patent number: 7216939
    Abstract: This brake hydraulic pressure control apparatus adopts, as the pressure-increasing valve, a normally-open linear solenoid valve that can linearly adjust the actual differential pressure. This apparatus repeatedly executes, in principle, a control cycle in which a pressure-reducing control, holding control and linear pressure-increasing control make one set, after ABS control start conditions are satisfied (after time t1). In this case, a pulse pressure-increasing control is executed instead of the linear pressure-increasing control only in the first-time control cycle (time t3 to t6).
    Type: Grant
    Filed: April 13, 2005
    Date of Patent: May 15, 2007
    Assignee: Advics Co., Ltd.
    Inventor: Katsuo Obai
  • Patent number: 7201456
    Abstract: A pneumatic brake booster for a motor vehicle, comprising a piston (22) mounted between a control rod (24) actuated by a brake pedal and a push rod (34) actuating a piston of a brake master cylinder. Structure for increasing brake boosting during an emergency braking, comprising a cylindrical sleeve (46) mounted in an axially sliding and sealed manner inside the piston (22). The sleeve being retained in the rest position by locking arrangement (58) and released to push away the shutter (56) of a three-way valve and increase the supply of atmospheric air to the booster when the control rod (24) is moved at a speed that is greater than a predetermined value.
    Type: Grant
    Filed: September 9, 2003
    Date of Patent: April 10, 2007
    Assignee: Robert Bosch GmbH
    Inventors: Juan Simon Bacardit, Bruno Berthomieu, Fernando Sacristan
  • Patent number: 7178882
    Abstract: A boosted brake for actuating a primary piston (54) of a master cylinder through a feeler and a reaction disk having a decompression piston (62) that is elastically returned by a spring (70). The decompression piston (62) has at least two radial branches (64) that are housed in the primary piston (54) of the master cylinder to provide two boost ratios that differ according to the intensity of an input force applied by an operator to effect a brake application.
    Type: Grant
    Filed: January 26, 2004
    Date of Patent: February 20, 2007
    Assignee: Robert Bosch GmbH
    Inventors: Bruno Berthomieu, Juan Simon Bacardit, Fernando Sacristan
  • Patent number: 7152933
    Abstract: An algorithm residing in, for example the ECM of a motor vehicle, which predicts brake booster vacuum for vehicles using vacuum for brake pedal assist. The predicted brake booster vacuum is compared to a calibrated brake booster vacuum threshold to determine if adequate brake booster vacuum is available to meet vehicle braking requirements, whereupon engine operation can be modified, as necessary, to improve intake manifold vacuum such that brake booster vacuum requirements for vehicle braking are better satisfied.
    Type: Grant
    Filed: November 3, 2005
    Date of Patent: December 26, 2006
    Assignee: General Motors Corporation
    Inventors: James F. Collins, Robert L. Nisonger, Christopher P. Murphy
  • Patent number: 7100997
    Abstract: A boosted brake (10) having a booster (12) for activating a primary piston (54) of a master cylinder (14) by way of a feeler (42), a reaction disk (28) and a push rod (52). The push rod (52) that is housed a decompression piston (62) and returned elastically by a spring (70) to a position of rest has at least two radial branches (64) in order to provide two boost ratios which differ according to the intensity of the input force.
    Type: Grant
    Filed: January 26, 2004
    Date of Patent: September 5, 2006
    Assignee: Robert Bosch GmbH
    Inventors: Bruno Berthomieu, Juan Simon Bacardit, Fernando Sacristan
  • Patent number: 7040717
    Abstract: In a negative pressure boosting device of the present invention, upon depression of a pedal at a normal speed, an input shaft 11 and a valve plunger 10 move forward to close a vacuum valve 15 and open an atmospheric valve 16 and a power piston 5, a valve body 4, and an output shaft 24 move forward. In the initial stage of operation, hooks 27c and 31a are not engaged with each other so that a cylindrical member 27 does not move forward, thereby shortening the stroke of the input shaft 11 as compared to a conventional one. Upon rapid depression of the pedal, a press face 10a presses a pressed face 27e so as to deform an engaging arm portion 27b, thereby disengaging the hooks 27c and 31a from each other. The cylindrical member 27 is moved backward by a spring 30 to push a vacuum valve portion 12b so that the atmospheric valve portion 12a is spaced apart from the atmospheric valve seat 14 more rapidly than that of the service braking, thereby increasing the jumping amount and thus rapidly intensifying the output.
    Type: Grant
    Filed: December 24, 2002
    Date of Patent: May 9, 2006
    Assignee: Bosch Automotive Systems Corporation
    Inventors: Satoru Watanabe, Hidefumi Inoue
  • Patent number: 7040718
    Abstract: A calibration process for a pneumatic-assistance servomotor in a braking circuit of a motor vehicle. The values of the output pressure (Pmc) of a hydraulic master cylinder associated with the servomotor and of the negative pressure inside the working chamber of the servomotor are measured and recorded with respect to a given negative-pressure value (Pfc) inside a negative-pressure chamber of a servomotor for several operating points P1, P2, P3, P4 of the servomtotor. The operating points being located on either side of a saturation point to precisely determine the coordinates of the saturation point and thereby provide an accurate control of advanced functions of the servomotor with respect to braking operation, the braking assistance and/or the monitoring of the performance or of the ageing of the servomotor.
    Type: Grant
    Filed: September 6, 2002
    Date of Patent: May 9, 2006
    Assignee: Robert Boch GmbH
    Inventors: Werner Quirant, Jean-Marc Piel
  • Patent number: 7040719
    Abstract: An algorithm residing in, for example the ECM of a motor vehicle, which predicts brake booster vacuum for vehicles using vacuum for brake pedal assist. The predicted brake booster vacuum is compared to a calibrated brake booster vacuum threshold to determine if adequate brake booster vacuum is available to meet vehicle braking requirements, whereupon engine operation can be modified, as necessary, to improve intake manifold vacuum such that brake booster vacuum requirements for vehicle braking are better satisfied.
    Type: Grant
    Filed: April 1, 2004
    Date of Patent: May 9, 2006
    Assignee: General Motors Corporation
    Inventors: James F. Collins, Robert L. Nisonger, Christopher P. Murphy
  • Patent number: 7021724
    Abstract: In a vacuum booster in which a reaction force mechanism is interposed between an input rod and a valve cylinder connected integrally with a booster piston, and an output rod, a valve piston is fitted onto an input piston connecting the input rod and the reaction force mechanism to be slidably movable forward from a predetermined retreat position with respect to the input piston, the valve piston is biased to the retreat position by a set spring, and locking device is provided between the valve piston and the valve cylinder to lock the valve piston at the valve cylinder thereby holding an atmosphere introduction valve seat in an open state at the time of emergency braking when the input piston moves forward by a predetermined number of strokes ahead of the valve cylinder. Thus, while a delay in atmosphere introduction into the operating chamber is eliminated irrespective of normal braking or emergency braking, the output is allowed to reach a servo limit point earlier and held at the time of emergency braking.
    Type: Grant
    Filed: June 28, 2004
    Date of Patent: April 4, 2006
    Assignee: Nissin Kogyo Co., Ltd.
    Inventors: Takayoshi Shinohara, Toshiyuki Suwa
  • Patent number: 7014276
    Abstract: A vacuum booster which moderates a retraction speed of a valve seat member to restrain a contact noise between a key member retracting in a unitary manner with the valve seat member and a flange surface of a plunger. The vacuum booster includes a noise restriction device.
    Type: Grant
    Filed: August 22, 2002
    Date of Patent: March 21, 2006
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Akihiko Miwa, Kaoru Tsubouchi, Nobuyuki Hirota, Tomoyasu Sakai
  • Patent number: 7008024
    Abstract: A pneumatic-hydraulic hybrid pneumatic brake booster is improved. Additional hydraulic boosting (19, 20) provided by a hydraulic circuit is provided beyond a saturation point (Psat) in the operation of the pneumatic circuit. Hysteresis-induced instabilities in the pneumatic part of the booster are taken into consideration (50). A choice is made to compensate (A) for the shortfall in operation of the pneumatic circuit using the hydraulic circuit. In one example, this correction is afforded via a microprocessor which imposes a corrected process signal. Using this signal, pressure shifts in the pneumatic system are neutralized.
    Type: Grant
    Filed: November 26, 2001
    Date of Patent: March 7, 2006
    Assignee: Robert Bosch GmbH
    Inventors: Jean-Marc Piel, Nicolas Marlhe, Stéphane Gendrinl
  • Patent number: 6988778
    Abstract: A pneumatic brake booster for use in a motor vehicle having a feeler (42) mounted to slide on a plunger (32) located at the end of a control rod (22) and pivoting key (62) for axially blocking the movement of the feeler (42) with respect to the plunger (32) during a normal brake application and unblocking the movement during an emergency brake application to reduce the length of a plunger-feeler assembly and thus increase the jump phase of an output force.
    Type: Grant
    Filed: January 9, 2004
    Date of Patent: January 24, 2006
    Assignee: Robert Bosch GmbH
    Inventor: Juan Simon Bacardit
  • Patent number: 6905178
    Abstract: A spacer for positioned a boost unit in an engine compartment of a vehicle. The spacer is defined by a wall located between a front face and a rear face, bearing surfaces, an axial opening with a flange thereon, ribs that extend from the flange to define a plurality of radial slots, an axial slot that extends from the front face toward the rear face and a peripheral slot that connects the axial slot with the engine compartment. A base of a boot that surrounds a hub on the boost unit engages the front face to define a flow path from the engine compartment to the hub. Tabs on the spacer assure that the front face is aligned with the base while the radial ribs prevent the base from engaging the wall to assure that the size of flow path remains constant during the communication of air to the hub.
    Type: Grant
    Filed: February 19, 2004
    Date of Patent: June 14, 2005
    Assignee: Robert Bosch GmbH
    Inventors: William F. Morlan, James V. Reinmann
  • Patent number: 6896337
    Abstract: A brake booster having a housing is separated into a first chamber and a second chamber by a wall connected to a hub. The hub has a cylindrical body with an axial bore that retains a control valve for sequentially connecting the first chamber with the second chamber to provide for the equalization of fluid pressure therein to define a first mode of operation and interrupting communication between the first and second chambers while connecting the second chamber to a surrounding environment to allow air to enter into the second chamber and create a pressure differential across the wall to defining a second mode of operation. The pressure differential acts on the wall to develop an output force that pressurize fluid to effect a brake application. The brake booster is characterized by a first input member responsive to a manual input and a second input member responsive to an ECU for moving the control valve from the first mode to the second mode to respectively develop first and second brake applications.
    Type: Grant
    Filed: August 21, 2003
    Date of Patent: May 24, 2005
    Assignee: Robert Bosch Corporation
    Inventors: Amy Backhus, Steve E. Villaire, Mark LaCosse, Walter Last
  • Patent number: 6871918
    Abstract: A method and system for ensuring reliable operation of a brake booster system for a vehicle braking system in which a pressure value prevailing in the brake pressure reservoir of the brake booster system is sensed by a pressure sensor. An error occurring in the brake booster system is detected by evaluating the sensed pressure value prevailing in the brake pressure reservoir as a function of the actuation of the brake actuating mechanism. The brake booster system includes a diagnostic circuit that is connected to the pressure sensor and to the brake actuating mechanism.
    Type: Grant
    Filed: July 29, 2002
    Date of Patent: March 29, 2005
    Assignee: Robert Bosch GmbH
    Inventors: Ernst Wild, Kristina Eberle
  • Publication number: 20040189088
    Abstract: A pneumatic brake booster (10) of the type comprising a moving piston (22) urging an actuating rod (34) of a master cylinder (28) in response to actuation of a plunger (56) of which a front end, passing through the piston (22) and forming a first feeler (62) can, when the plunger (56) is in the extreme position, penetrate a reaction disc (44) inserted between the piston (22) and the actuating rod (34) to transmit to the plunger (56) the reaction force of the master cylinder (28), characterized in that it comprises a second feeler (68) which can, when the control rod (46) is actuated at a rate higher than a determined rate, be pushed by the plunger (56) and immobilized by a one-way engagement device (70) in an axial position that varies with respect to the piston (22), then be driven by the piston to push the second feeler (68) into the disc (44) so that the first feeler (52) applies a braking force more rapidly.
    Type: Application
    Filed: April 19, 2004
    Publication date: September 30, 2004
    Inventors: Juan Simon Bacardit, Bruno Berthomieu, Fernando Sacristan, Antony Auguste
  • Publication number: 20040160119
    Abstract: In a vacuum brake booster of a vehicle braking system, comprising a vacuum housing that is subdivided by at least one movable partition into at least one vacuum chamber and at least one working chamber, comprising a sensor unit adapted to sense the pressure in the vacuum chamber and the pressure in the working chamber or the difference in pressure between the working chamber and the vacuum chamber, an electronic control unit is associated with the vacuum brake booster and includes an evaluation unit for the purpose of evaluating the sensed pressures in the vacuum chamber and the working chamber or the difference in pressure between the working chamber and the vacuum chamber. The electronic control unit includes an actuation unit for the purpose of actuating an active hydraulic brake force boosting unit on the basis of the evaluation by the evaluation unit.
    Type: Application
    Filed: December 2, 2003
    Publication date: August 19, 2004
    Inventors: Wilfried Wagner, Hans-Jorg Feigel, Ingo Knewitz
  • Publication number: 20040140713
    Abstract: Pneumatic brake-booster with additional hydraulic boosting and method for boosting braking using such a booster.
    Type: Application
    Filed: March 19, 2004
    Publication date: July 22, 2004
    Inventors: Jean-Marc Piel, Nicolas Marlhe, Stephane Gendrinl
  • Patent number: 6763803
    Abstract: The pressure in an underpressure store of a pneumatically operated servo system is controlled by a method wherein the underpressure store is charged with an underpressure via a suction line. A higher desired pressure for the underpressure store is pregiven in a rest state of the servo system wherein the system is not actuated and no actuation is expected. A lower desired pressure for the underpressure store is preset in a state wherein the servo system is actuated or an actuation is expected.
    Type: Grant
    Filed: August 2, 2001
    Date of Patent: July 20, 2004
    Assignee: Robert Bosch GmbH
    Inventors: Ernst Wild, Kristina Eberle, Lutz Reuschenbach
  • Patent number: 6755486
    Abstract: The vehicle motion control system includes an automatic hydraulic pressure generator generating a hydraulic pressure irrespective of a brake pedal operation and a hydraulic pressure control valve adjusting the hydraulic brake pressure by opening or blocking a connection between the automatic hydraulic pressure generator and a wheel brake cylinder. The system includes vacuum pressure detecting means to adjust the hydraulic brake pressure in a appropriate condition. In response to the vacuum pressure detecting means, vehicle motion is controlled in the direction that the vehicle motion control is restricted under the vacuum pressure which drives said vacuum booster is relatively small. Also, the duration of the hydraulic brake pressure increase is controlled in the direction longer under the vacuum pressure which drives said vacuum booster is relatively small.
    Type: Grant
    Filed: October 1, 2001
    Date of Patent: June 29, 2004
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Akitaka Nishio, Masanobu Fukami
  • Patent number: 6749271
    Abstract: The invention relates to a pneumatic-hydraulic brake system with a pneumatic/hydraulic converter which converts a pressure that is pneumatically input by the driver into a hydraulic brake pressure. A sensor is provided which detects a physical variable that gets adjusted in the converter when the pneumatic pressure is input. The sensor generates a warning signal when a pre-given variable is detected.
    Type: Grant
    Filed: July 22, 2002
    Date of Patent: June 15, 2004
    Assignee: Knorr-Bremse Systeme Fuer Nutzfahrzeuge GmbH
    Inventors: Mathias Mayr-Fröhlich, Paolo Pizzolato
  • Patent number: 6739676
    Abstract: Vehicle braking system including a vacuum booster for transmitting a boosted brake operating force to a master cylinder such that the boosting ratio is reduced at a fixed transition point before the boosting limit point is reached, a brake having a wheel brake cylinder connected through a fluid passage to a master cylinder serving as a first hydraulic pressure source, for braking a wheel, and a pressure increasing device having a second hydraulic pressure source connected to the fluid passage, and wherein the pressure increasing device initiating a pressure increasing operation, when the brake operating force has increased to the transition point, to increase the wheel cylinder pressure to be higher than the master cylinder pressure, by using the second hydraulic pressure source.
    Type: Grant
    Filed: January 19, 1999
    Date of Patent: May 25, 2004
    Assignees: Toyota Jidosha Kabushiki Kaisha, Aisin Seiki Kabushiki Kaisha
    Inventors: Hiroshi Isono, Yasuji Mizutani, Yutaka Onuma, Koichi Kondo, Hirofumi Nitta, Motoshi Suzuki
  • Publication number: 20040074233
    Abstract: A braking device, particularly for a motor vehicle, comprising a master cylinder (10) associated with a pneumatic booster (12), and a vacuum pump (36) to create a vacuum in the vacuum chamber (16) of the booster, characterized in that the vacuum pump (36) is fixed to the envelope (14) of the booster on the inside of the latter within the vacuum chamber (16).
    Type: Application
    Filed: September 17, 2003
    Publication date: April 22, 2004
    Inventor: Juan Simon Bacardit
  • Publication number: 20040069582
    Abstract: A servobrake (10), of the type comprising a pneumatic brake booster (12) and a master cylinder (22) a main piston (20) of which slides in a front pressure chamber (24) and comprises:
    Type: Application
    Filed: September 17, 2003
    Publication date: April 15, 2004
    Inventors: Juan Simon Bacardit, Bruno Berthomieu, Fernando Sacristan
  • Patent number: 6715846
    Abstract: Described is a braking-pressure control system, especially for a road vehicle, having a pneumatic brake booster (14), having a main cylinder (16) in which a main-cylinder pressure (PHZ) can be generated by a pneumatic brake booster (14), and having a hydraulic modulator (17) which is connected between the main cylinder (16) and at least one wheel-brake cylinder (10-13) of at least one wheel; the hydraulic modulator (17) including a configuration of switchable valves (ASV, USV, EV, AV), as well as one pump (25, 25′); and a wheel-brake cylinder pressure (PRZ) being able to be generated in the at least one wheel-brake cylinder (10-13), using the hydraulic modulator; the wheel-brake cylinder pressure being higher than the main-cylinder. pressure (PHZ). The braking-pressure control system is characterized in that the pneumatic brake booster (14) is designed in a manner allowing it to already reach its saturation point (A0, A1) at a main-cylinder pressure (PHZ) of less than 50 bar.
    Type: Grant
    Filed: September 12, 2000
    Date of Patent: April 6, 2004
    Assignee: Robert Bosch GmbH
    Inventors: Helmut Pueschel, Herbert Keller
  • Patent number: 6709071
    Abstract: A vehicle motion control device includes a throttle opening amount automatic adjusting device for adjusting automatically the opening amount of the engine throttle valve irrespective of accelerator pedal operation, a control device for performing an automatic pressure increase control to the wheel cylinder at least during a non-operating condition of the brake pedal and for controlling the throttle opening amount automatic adjusting device, an intake vacuum pressure decrease condition detecting device for detecting a decrease condition of the intake vacuum pressure, and a counter for counting the number of times the automatic pressure increase control is performed under the intake vacuum pressure decrease condition. The control device corrects the throttle opening amount at the automatic pressure increase control to decrease based on the number of time the automatic pressure increase control is performed.
    Type: Grant
    Filed: May 29, 2002
    Date of Patent: March 23, 2004
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventor: Masanobu Fukami
  • Publication number: 20040046445
    Abstract: A braking device for a motor vehicle, including a master cylinder (2) with a primary piston (3) subjected to an actuating force of an input force exerted by a manual operating member (4) and a boost force exerted by a booster (6) coupled to the manual operating member (4) and an emergency assist valve (VA). Valve (VA) comprises: a reaction piston (19) sliding in a bore (20) of the primary piston (3) and urged toward a position of rest by by an elastic return member (22); a rapid piston (32) having a cross section smaller than the reaction piston (19) and sliding in a sealed manner in a bore (31) of a bushing (30) in bore (200; and a ratio control (27) actuated by a plunger distributor (10) driven by the manual operating member (4). The elastic return member (22) is arranged outside of the primary piston (3) and a transmission element (T) is provided to transmit a return force of the elastic return member (22) to the reaction piston (19).
    Type: Application
    Filed: June 16, 2003
    Publication date: March 11, 2004
    Inventors: Ulysse Verbo, Jean-Marc Attard, Antony Auguste
  • Publication number: 20040012254
    Abstract: A pneumatic brake booster comprising a rigid casing (10) locally shaped into a hollow shaft (3), a hub (5) slideably mounted in an opening (30) of the hollow shaft (3), an annular seal (6) inserted between the hub (5) and the hollow shaft (3), and members designed to set the hub (5) in a rest position with respect to the hollow shaft (3). The seal (6) comprises an elastomeric material (61) shaped into an annulus and an annular metal insert (62), the position-setting members (71, 72) being partially formed by the insert (62).
    Type: Application
    Filed: April 29, 2003
    Publication date: January 22, 2004
    Inventors: Jean-Pierre Michon, Bruno Beylerian
  • Publication number: 20040012255
    Abstract: A pneumatic brake booster for a motor vehicle, of the type in which the movements of a control rod (38) are able to determine the openings and closings of at least one axial intake valve (52) which is inserted between a pressure source subjected to the pressure (Pa) higher than the first pressure (P1) and a rear chamber (18) of the booster, and of at least one axial equalizing valve (50) which is inserted between a front chamber (16) and the rear chamber (18), to actuate a moving partition (14) inserted between the front chamber (16) and the rear chamber (18), characterized in that it comprises a tubular element (76) of which axially offset transverse faces (78, 80) comprise first elements (82, 84) for sealing the axial intake and equalizing valves (50, 52) and that the control rod (38) is able to operate via two concentric springs (40, 122) having different stiffnesses.
    Type: Application
    Filed: April 29, 2003
    Publication date: January 22, 2004
    Inventors: Jean-Charles Maligne, Stephane Lacroix, Philippe Richard, Ulysse Verbo
  • Publication number: 20040012253
    Abstract: This invention relates to a sensor module, comprising a processing unit, a stroke sensor and a force sensor (3), and capable of determining, inside the associated pneumatic servomotor for an assisted braking, data concerning both the force exerted on an axially-moving rod (1), and the travel of said rod (1), by the determination of the position of the piston (2) coupled to the rod (1).
    Type: Application
    Filed: November 16, 2001
    Publication date: January 22, 2004
    Inventors: Gendrin Stephane, Jean Fourcade, Thierry Pasquet
  • Patent number: 6676230
    Abstract: A vehicle motion control device reduces noise resulting from operation of a vacuum booster when an automatic pressure control is performed by properly controlling the energization of a linear solenoid of a booster actuator. An automatic hydraulic pressure generator is controlled in accordance with the vehicle motion condition and a hydraulic pressure control valve device is controlled to perform the automatic pressure control. A target electric current of the linear solenoid for actuating the vacuum booster is instantaneously increased to a starting target value which corresponds to an electric current value immediately before starting the operation of the vacuum booster and which is less than a maximum value of the target electric current, and then is gradually increased approximately to the maximum value of the target electric current.
    Type: Grant
    Filed: October 19, 2001
    Date of Patent: January 13, 2004
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Tetsuya Kuno, Tetsuaki Tsuzuki, Akitaka Nishio, Masanobu Fukami, Shiro Monzaki
  • Publication number: 20040000813
    Abstract: Disclosed is a master cylinder wherein a seal member is given plural seal functions to reduce the number of seal members for partitioning a drain portion of the master cylinder, a constant-pressure chamber of a booster and the atmosphere from one another, so that the master cylinder is simplified in construction and reduced in manufacturing cost. When a piston is operated by an output shaft of the booster attached to a booster mounting surface of a cylinder body, the operating fluid from the fluid pressure chamber partitioned by a fluid-tight seal member is supplied to a brake system. An annular complex seal member is fit in an internal seal stepped portion which is formed by radially expanding an opening portion of the cylinder which opens to a booster mounting surface. A slide seal portion of the complex seal member partitions a drain portion behind the fluid-tight seal member from the constant-pressure chamber of the booster through sliding contact with the piston.
    Type: Application
    Filed: May 20, 2003
    Publication date: January 1, 2004
    Applicant: ADVICS CO., LTD.
    Inventors: Katsuhiro Mita, Atsushi Yasuda
  • Patent number: 6666530
    Abstract: A vacuum booster apparatus used for a brake apparatus positively decreases a degree of opening of a throttle valve when it is required while an unnecessary decrease in the degree of opening of the throttle valve is positively prevented. A first pressure chamber of a vacuum booster is connected to an intake pipe of the engine on a downstream side of a throttle valve. A second pressure chamber of the vacuum booster is selectively connectable to one of the first pressure chamber and atmosphere. The vacuum booster boosts an operating force applied to a brake operating member based on a pressure difference between the first pressure chamber and the second pressure chamber. A throttle-opening-degree control device controls a negative pressure in the first pressure chamber by controlling the degree of opening of the throttle valve.
    Type: Grant
    Filed: January 16, 2002
    Date of Patent: December 23, 2003
    Assignees: Toyota Jidosha Kabushiki Kaisha, Aisin Seiki Kabushiki Kaisha
    Inventors: Yasuji Mizutani, Motoshi Suzuki, Hirofumi Nitta
  • Patent number: 6659245
    Abstract: This is a new brake system for minimizing the turning radius of a vehicle when it makes a U-turn or parks. The minimum turning radius of a conventional vehicle has a certain limit because a conventional vehicle takes the Ackerman-Jeantaud steering principle. The object of this invention is to overcome the limit of the minimum turning radius by introducing the new concept, the one wheel brake system. This invention utilizes the phenomenon that if one wheel is braked, the other wheel is driven by the differential gear. Hence the vehicle circles around a braked wheel as its pivot. So it turns much smaller than the minimum turning radius of the Ackerman-Jeantaud steering angle.
    Type: Grant
    Filed: January 14, 2002
    Date of Patent: December 9, 2003
    Inventor: Byung-Kug Lee
  • Publication number: 20030214178
    Abstract: A pneumatic brake booster for a motor vehicle wherein movements of a control rod (38) determine the openings and closings of at least one axial intake valve (52) and at least one equalizing valve (50). The intake valve (52) being inserted between a pressure source subjected to the pressure (Pa) higher than the first pressure (P1) and a rear chamber (18) of the booster, and the equalizing valve (50) being inserted between a front chamber (16) and the rear chamber (18) to actuate a moving partition (14) located between the front chamber (16) and the rear chamber (18). A tubular element (76) of that is axially offset transverse faces (78, 80) comprised of first elements (82, 84) for sealing the axial intake and equalizing valves (50, 52).
    Type: Application
    Filed: June 4, 2003
    Publication date: November 20, 2003
    Inventors: Ulysse Verbo, Philippe Richard, Jean-Charles Maligne, Stephane Lacroix
  • Publication number: 20030205933
    Abstract: This invention mainly relates to a pneumatic servomotor for an assisted braking, which reduces the noise in the passenger space to the minimum, while not requiring much room in the engine compartment, and it also relates to a motor vehicle equipped with such servomotor.
    Type: Application
    Filed: March 14, 2002
    Publication date: November 6, 2003
    Inventor: Cedric Leboisne
  • Patent number: 6637836
    Abstract: The solenoid current increases at low temperatures and decreases at high temperatures because the modulus of elasticity of an elastically deformable valve body and the slide resistance of an elastically deformable seal member vary with temperatures. Therefore the solenoid current for opening the valve mechanism from a closed position is required to be changed with low and high temperatures. To supply the solenoid current necessary for opening the valve mechanism without directly measuring the temperature, the solenoid current (the boost starting current leaning value) indicated when the pressure varies with the opening of the valve mechanism is recorded at the time of pressure-increasing, and thereafter when the valve mechanism is opened again after the closing of the valve mechanism, the solenoid current computed on the basis of the pressure-increase starting current learning value thus recorded is supplied.
    Type: Grant
    Filed: September 25, 2001
    Date of Patent: October 28, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Satoru Kuragaki, Tokuji Yoshikawa, Atsushi Yokoyama, Toshio Manaka