Of Brake Fluid Patents (Class 340/452)
  • Patent number: 10086816
    Abstract: An ECU (19) outputs control signals to an electric booster (16) of a fluid-pressure generating device (5) and to an ESC (22). In this way, the establishment and cutting off of communication through pressure-increase control valves (29), (29?), (31), and (31?) of the ESC (22) are controlled to connect each of wheel cylinders (1) to (4) in turn to the master cylinder (8). In doing so, the electric booster (16) is controlled for each of the wheel cylinders (1) to (4) to measure a stroke of a piston (10), (11) of a master cylinder (8), or a volume of brake fluid proportional to the stroke of the piston (10), (11), and a fluid pressure detected by fluid-pressure sensors (20) and (21). The fluid volume-pressure characteristic of each of the wheel cylinders (1) to (4) so determined is used for comparison to detect any atmospheric air in each pipeline.
    Type: Grant
    Filed: March 26, 2014
    Date of Patent: October 2, 2018
    Assignee: HITACHI AUTOMOTIVE SYSTEMS, LTD.
    Inventors: Makoto Matsuura, Daisuke Goto, Tohma Yamaguchi, Tatsuji Ohkubo
  • Patent number: 9627279
    Abstract: An apparatus for manufacturing an light emitting diode (LED) package, includes: a heating unit heating an LED package array in a lead frame state in which a plurality of LED packages are installed to be set in an array on a lead frame; a testing unit testing an operational state of each of the LED packages in the LED package array by applying a voltage or a current to the LED package array heated by the heating unit; and a cutting unit cutting only an LED package determined to be a functional product or an LED package determined to be a defective product from the lead frame to remove the same according to the testing results of the testing unit.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: April 18, 2017
    Assignee: SAMSUNG ELECTRONICS CO., LTD.
    Inventors: Won Soo Ji, Choo Ho Kim, Sung Hoon Oh, Min Hwan Kim, Beom Seok Shin
  • Patent number: 9366269
    Abstract: A system to diagnose a health of a hydraulic accumulator is provided. The hydraulic accumulator includes a first fluid chamber, a second fluid chamber, and a separator. The hydraulic accumulator has an associated pre-charge pressure. The system further includes a pressure sensor, a fluid source, a data processor, and a comparator. The pressure sensor and the fluid source are connected to the first fluid chamber. The data processor is configured to determine a first and second rate of pressure changes, and a transition pressure between the first and second rates. The approximate pre-charge pressure is determined based on the transition pressure. The comparator is configured to compare at least one of the determined pre charge pressure and the frictional forces with a pre-determined threshold range of pre-charge pressure and the frictional forces associated with the hydraulic accumulator to diagnose the health of the hydraulic accumulator.
    Type: Grant
    Filed: March 22, 2012
    Date of Patent: June 14, 2016
    Assignee: Caterpillar Inc.
    Inventors: Dayao Chen, Pengfei Ma, Tonglin Shang, Bryan J. Hillman
  • Publication number: 20150145665
    Abstract: A system is disclosed for communicating tactile messages to a user, such as a racecar driver, yacht crewmember, or other athlete. The system can include a tactile vest having tactile activators for conveying tactile messages to the user, including real time messages for helping the user assess and improve physical performance. The messages may be generated based on various types of sensor data, including, for example, data collected by vehicle sensors of a racecar or yacht.
    Type: Application
    Filed: January 23, 2015
    Publication date: May 28, 2015
    Inventor: Peter Hill
  • Patent number: 8659413
    Abstract: A fluid level monitoring system may include a control panel having a plurality of input devices, each corresponding to a monitored fluid of a machine, and a plurality of indicators, each corresponding to one of the input devices. The indicators may provide visual displays of fluid level statuses for the monitored fluids. The fluid level monitoring system may further include a message display device that may display a fluid level status message for one of the monitored fluids based on the actuation of the corresponding input device of the control panel.
    Type: Grant
    Filed: November 23, 2010
    Date of Patent: February 25, 2014
    Assignee: Caterpillar Inc.
    Inventors: Thomas M. Sutherland, Austin D. Ehle, Randy Aneloski, Luke J. Daiberl, Jack Elder
  • Patent number: 8536996
    Abstract: An information display system for a vehicle includes an information display for displaying a plurality of selectable information display levels according to an information display hierarchy. Each selectable information display level may include one or more visual gauges for conveying vehicle information. Each successive selectable information display level may include additional and/or alternative vehicle information when compared to the preceding selectable information display level. The information display system further includes a controller configured to display the plurality of selectable information display levels according to an at least one driver input. In this way, the information display can display a particular selectable information display level best suited to a driver's individual preferences or understanding of the vehicle's operations.
    Type: Grant
    Filed: May 30, 2012
    Date of Patent: September 17, 2013
    Assignee: Ford Global Technologies, LLC
    Inventors: David Watson, Angela L. Watson, Sohel Merchant, Craig Sandvig, Ivette Hernandez, Steven Bishop, Engin Erdogan, Altay Jun Wakui Sendil, Susanne Stage, Ryan J. Skaff, Derek Hartl, James Belloli, Jeffrey Greenberg, Michael Blommer
  • Patent number: 8207841
    Abstract: An information display system for a vehicle includes an information display for displaying a plurality of selectable information display levels according to an information display hierarchy. Each selectable information display level may include one or more visual gauges for conveying vehicle information. Each successive selectable information display level may include additional and/or alternative vehicle information when compared to the preceding selectable information display level. The information display system further includes a controller configured to display the plurality of selectable information display levels according to an at least one driver input. In this way, the information display can display a particular selectable information display level best suited to a driver's individual preferences or understanding of the vehicle's operations.
    Type: Grant
    Filed: October 28, 2008
    Date of Patent: June 26, 2012
    Assignee: Ford Global Technologies, LLC
    Inventors: David Watson, Angela L. Watson, Sohel Merchant, Craig Sandvig, Ivette Hernández, Steven Bishop, Engin Erdogan, Altay Jun Wakui Sendil, Susanne Stage, Ryan J. Skaff, Derek Hartl, James Belloli, Jeffrey Greenberg, Michael Blommer
  • Patent number: 8098145
    Abstract: Apparatus and method for detecting the connection of a trailer to a vehicle. The apparatus is connected to a pneumatic pressure line of the trailer's service braking system, and measures the pressure of the system to determine if the trailer is properly connected to the vehicle when the vehicle's engine is running. Further, the apparatus also contains an algorithm that monitors the signals from other vehicle systems, and uses that information to determine the trailer characteristics. The vehicle engine control system receives information from the apparatus and adjusts the various vehicle systems accordingly.
    Type: Grant
    Filed: February 19, 2007
    Date of Patent: January 17, 2012
    Assignee: Volvo Group North America, LLC
    Inventors: Mircea Florin Ancuta, Wesley Chominsky, Eric M Bernhart
  • Publication number: 20090278674
    Abstract: A control circuit for activating at least one emergency light when a vehicle's brakes are applied is described. The control circuit includes a pressure switch configured to selectively couple a power source and an electronically-operated actuator to facilitate selectively energizing the electronically-operated actuator. The electronically-operated actuator includes at least one contact set configured to couple the power source to the at least one emergency light when the electronically-operated actuator is not energized. The control circuit also includes a manual reset circuit coupled to the pressure switch and to the electronically-operated actuator. The manual reset circuit configured to facilitate energizing the electronically-operated actuator upon receipt of an operator input.
    Type: Application
    Filed: May 12, 2009
    Publication date: November 12, 2009
    Inventors: William Henry Gross, Ronald David Bauerle
  • Patent number: 7391309
    Abstract: A monitoring system for driver's braking habits comprising a sensor connected to brakes of a vehicle provided to sense and evaluate the following levels of pressure being applied to the brakes by a driver: normal pressure, above normal pressure and an excessive pressure level. The sensor is adapted to activate a warning signal element connected to the sensor and is provided to warn the driver when the pressure level exceeds the above normal pressure level and the excessive pressure level which facilitates correction of bad driving habits of the driver and development of preventive driving techniques. The sensor comprises a first sensor adapted to sense and evaluate the above normal pressure level, and a second sensor adapted to sense and evaluate the excessive pressure level.
    Type: Grant
    Filed: August 13, 2004
    Date of Patent: June 24, 2008
    Assignee: Securite GMR Safety
    Inventors: Albert Chartier, Gaetan Jette
  • Patent number: 7102495
    Abstract: A collision prevention method for motor vehicles is provided, in which method obstacles in front of the vehicle are detected by an on-board positioning system, a collision probability is calculated from the position data, and one or more responses to prevent a collision are triggered as a function of the collision probability. At least one of the responses is a preparatory measure accelerating the implementation of a command, which may be output later, to decelerate the vehicle, without the preparatory measure itself having any significant decelerating effect on the vehicle.
    Type: Grant
    Filed: February 16, 2002
    Date of Patent: September 5, 2006
    Assignee: Robert Bosch GmbH
    Inventors: Bernhard Mattes, Berend-Wilhelm Doden, Rainer Moritz, Jochen Wagner
  • Patent number: 7088227
    Abstract: An alarm for a hydraulic system, a hydraulic system incorporating an alarm, a vehicle having a hydraulic system which incorporates an alarm, and a method of giving an alarm in a hydraulic system, where the hydraulic system comprises hydraulic fluid which is put in contact with a pressure detector, the pressure detector being for giving a signal in response to a condition of the hydraulic fluid in the hydraulic system. An alarm generator integral with said pressure detector is provided for giving an audible alarm in response to a said signal.
    Type: Grant
    Filed: December 29, 2003
    Date of Patent: August 8, 2006
    Assignee: General Signal UK Limited
    Inventor: Gordon Ward
  • Patent number: 7034673
    Abstract: Method for monitoring an electrohydraulic braking system. The volume uptake is determined by the elasticity within the wheel brake that is subjected to certain fluctuations, on the one hand, and to a much greater degree by the clearance that is present, on the other hand. To make a reliable statement relating to the air charge, an estimation of the current clearance is first made, taking three ranges into consideration. If there is a normal clearance, a top evaluation threshold is taken as a basis, which assumes the clearance lies at the upper end of the normal range. When said evaluation threshold is exceeded, an alarm is triggered. If the clearance is assumed to lie at the bottom limit of the normal range, a bottom evaluation threshold applies, however, an alarm is only triggered in this case this situation has occurred several times in succession.
    Type: Grant
    Filed: October 7, 2002
    Date of Patent: April 25, 2006
    Assignee: Centinental Teves AG & Co., OHG
    Inventors: Gunther Buschmann, Robert Schmidt, Thorsten Ullrich
  • Patent number: 6927681
    Abstract: A mixed air amount alarm device is provided which determines the amount of air present in a hydraulic circuit between a hydraulic pressure source and an instrument driven by hydraulic pressure, and produces an alarm if the air amount is excessive, a situation is prevented in which an alarm is produced or not produced according to change of the air amount (volume) resulting from temperature change, and it is possible to stop an alarm if potential danger disappears and a safe state is recovered due to spontaneous release of air out of the hydraulic circuit. If the air amount is determined excessive, this is stored in a nonvolatile memory, and even if air amount excessiveness determination is not made at the next activation of the hydraulic device, the content of the nonvolatile memory is checked and an alarm is produced if air amount excessiveness determination has not been made before.
    Type: Grant
    Filed: November 6, 2003
    Date of Patent: August 9, 2005
    Assignee: Advics Co., Ltd.
    Inventors: Masato Yoshino, Keita Nakano
  • Patent number: 6753771
    Abstract: A vehicle monitoring system for monitoring a condition of relatively moving vehicle components, particularly including the pushrod of a brake actuator, including a magnet on one of the components, a sensor on the other component within the magnetic field of the magnet generating a signal indicating a condition of the moving component, an electrically conductive coil preferably surrounding the magnet generating a current and an active RF chip connected to the coil and the sensor, thereby providing current to the active RF chip for signaling a receiver. In the disclosed embodiment of a brake actuator monitoring system, the magnet is fixed on the pushrod and the coil surrounds the pushrod and magnet.
    Type: Grant
    Filed: January 15, 2003
    Date of Patent: June 22, 2004
    Assignee: Indian Head Industries, Inc.
    Inventor: Alan C. Lesesky
  • Patent number: 6650234
    Abstract: A vehicular anti-theft system with brake line valve including a valve mechanism connected to the plurality of brake lines between a master cylinder and the associated brakes of a vehicle. The valve mechanism includes a housing with a solenoidal valve therein associated with the brake lines. The solenoidal valve has a first orientation with the solenoidal valve preventing control of the brakes by the master cylinder. The solenoidal valve further has a second orientation with the solenoidal valve thereby allowing control of the brakes by the master cylinder. The solenoidal valve includes a relay adapted to transfer between the first orientation upon and the second orientation. The solenoidal valve is adapted remain in a present orientation thereof without consuming power. Lastly, control circuitry is connected to the valve mechanism.
    Type: Grant
    Filed: April 16, 2001
    Date of Patent: November 18, 2003
    Inventor: Robert D. Soto
  • Patent number: 6549126
    Abstract: The present invention provides a sensor system for detecting lining wear and fluid level in a dry interface corner actuator for a single wheel brake including a reservoir assembly. The reservoir assembly includes a reservoir for containing fluid for the actuator and a sensor assembly positioned in the reservoir having a single set point to indicate both low reservoir fluid level and a need for brake lining replacement.
    Type: Grant
    Filed: January 25, 2001
    Date of Patent: April 15, 2003
    Assignee: Delphi Technologies, Inc.
    Inventors: John B. Hageman, Paul Rymoff, Jr., Ernst S. Baumgartner, John C. Layman
  • Publication number: 20020024433
    Abstract: The present invention provides a sensor system for detecting lining wear and fluid level in a dry interface corner actuator for a single wheel brake including a reservoir assembly. The reservoir assembly includes a reservoir for containing fluid for the actuator and a sensor assembly positioned in the reservoir having a single set point to indicate both low reservoir fluid level and a need for brake lining replacement.
    Type: Application
    Filed: January 25, 2001
    Publication date: February 28, 2002
    Applicant: DELPHI AUTOMOTIVE SYSTEMS
    Inventors: John B. Hageman, Paul Rymoff, Ernst S. Baumgartner, John C. Layman
  • Patent number: 6297733
    Abstract: A reliable capacitive oil deterioration and level sensor has a conductive housing member that includes a conductive shielding member defining a ground electrode, and a conductive inner member defining a measuring electrode. The shielding member protects the sensor from moving objects that could adversely affect its performance. The housing member is adapted to provide a fluidic connection between an oil container and a space between the ground electrode and the measuring electrode. The sensor also includes electronics adapted to employ this capacitor geometry to generate signals indicative of a degree of deterioration and a level of the oil within the gap. The electronics further include at least one isolating capacitor to eliminate a flow of current between the electrodes that may cause a build up of material on the two electrodes that define the capacitor. This build up of unwanted material may cause an undesirable effect in the sensor output signal.
    Type: Grant
    Filed: November 10, 2000
    Date of Patent: October 2, 2001
    Assignee: Kavlico Corporation
    Inventor: Kyong M. Park
  • Patent number: 6198388
    Abstract: A voice warning system for automobiles includes a microprocessor connected with the battery of an automobile, a plurality of sensors arranged on different parts of the engine and connected with the microprocessor, and two voice integrated circuits for storing voice messages, whereby the microprocessor will give voice messages to notify the driver of the conditions of the car thereby ensuring the safety of the driver.
    Type: Grant
    Filed: May 9, 2000
    Date of Patent: March 6, 2001
    Inventors: Victor Chen, Yu Cheng
  • Patent number: 6119059
    Abstract: An advance warning device for monitoring the working conditions of a hydraulic braking system of a motor vehicle is composed of a plurality of sensors and a controller in communication with the sensors for processing the signals transmitted by the sensors so as to provide the operator of the motor vehicle with an advance warning signal as to likelihood of the brake failure. The sensors are intended to monitor respectively the temperature of the brake lining piece, the temperature of the brake fluid kept in the distribution pump, the water content of the brake fluid of the hydraulic braking system, and the hydraulic pressure of the hydraulic braking system.
    Type: Grant
    Filed: March 26, 1998
    Date of Patent: September 12, 2000
    Assignee: Institute Of Occupational Safety And Health, Council Of Labor Affairs, Executive Yuan
    Inventors: Chi-Fu Tai, Shih-Hsiung Wu, Chung-Yun Gau, Shuo-Jen Lee, Ke-Feng Lin
  • Patent number: 5767397
    Abstract: In at least one operating situation, especially while the vehicle is stopped, pressure is built up in a defined manner and then released for test purposes without waiting for a steady state value to be reached. On the basis of the pressure-time or force-time curve in at least one wheel brake, a determination is made on whether or not an unacceptable amount of undissolved gas is present in the brake system.
    Type: Grant
    Filed: November 15, 1996
    Date of Patent: June 16, 1998
    Assignee: Robert Bosch GmbH
    Inventor: Uwe Eisele
  • Patent number: 5742230
    Abstract: An apparatus for triggering a warning device, in particular in a vehicle with an on-board controller to influence braking pressure and/or engine torque and/or steering as a function of the movement behavior of the vehicle wheels and/or of the vehicle, is described. In the event of a fault in the controller, ground is applied to the warning device by a control unit of the controller and the fault is thereby indicated. At least one comparator is provided, to which on the one hand a comparison voltage and on the other hand a further voltage can be applied, such that the comparator becomes conductive and applies to the warning device the ground applied to it, if the further voltage is less than a first comparison voltage and/or if the further voltage is greater than a second comparison voltage.
    Type: Grant
    Filed: May 13, 1996
    Date of Patent: April 21, 1998
    Assignee: Robert Bosch GmbH
    Inventors: Karl-Friedrich Kuhner, Thomas Beitler, Thomas Schneider, Gerhard Walter
  • Patent number: 5677667
    Abstract: In combination with a tractor and a trailer, an apparatus and method are provided for monitoring various operating conditions of at least the trailer by a driver positioned on the tractor. The apparatus preferably has a pneumatic braking system carried by the tractor and the trailer to permit the driver to supply pneumatic braking pressure from the tractor to the trailer. The pneumatic braking system preferably includes at least one pair of air hoses connected to the tractor and the trailer and a coupler connected to the pair of air hoses. The coupler has interconnecting first and second coupler portions arranged to facilitate connecting and disconnecting the pair of air hoses. The apparatus also has a data communications system which preferably includes a respective pair of transceivers connected to the first and second coupler portions for communicating signals representative of monitoring data from the trailer to the tractor so as to in turn be monitored by a driver positioned on the tractor.
    Type: Grant
    Filed: February 23, 1995
    Date of Patent: October 14, 1997
    Assignee: Vehicle Enhancement Systems, Inc.
    Inventors: Alan C. Lesesky, Bobby Ray Weant, David James Lee
  • Patent number: 5572187
    Abstract: A monitoring and safety system for air-operated parking brakes and foot brakes on a vehicle employs electric contacts to provide alarms when movement of the actuators occurs in a manner indicative of failure or malfunction in the actuators or in the brakes themselves. The system also includes a number of air pressure sensors for monitoring and alarm functions. In addition, parking brake air pressure is monitored for purpose of overriding a movement sensor alarm when air pressure in the actuator indicates that the vehicle is parked.
    Type: Grant
    Filed: May 23, 1994
    Date of Patent: November 5, 1996
    Inventor: Robert F. Williford
  • Patent number: 5570078
    Abstract: This invention relates to vehicle theft alarm and prevention devices, and in particular discloses a system that operates on the brakes of a vehicles to prevent the unauthorized use of a vehicle. Upon an unauthorized use of the vehicle, the system causes the brakes of the vehicle to remain engaged to the degree to which the user causes them to be engaged by operation of the brake pedal. The harder the brakes are applied, the less mobile the vehicle becomes. The system may be combined with audible delayed alarm signals.
    Type: Grant
    Filed: January 3, 1995
    Date of Patent: October 29, 1996
    Inventor: Albert Wayenberg
  • Patent number: 5413404
    Abstract: A method for detecting trouble in a fluid pressure system which has a fluid pressure source including a fluid pump, a pressure tank connected to the pump, a pressure detector for detecting fluid pressure in the pressure tank, and a control device for controlling the operation of the fluid pump on the basis of an output signal from the pressure detector, comprising the steps of operating such fluid pressure systems with output fluid pressure from the fluid pressure source, detecting variation in the output signal from the pressure detector and when the output signal is less than a first predetermined value during operation of the fluid pressure system driving said fluid pump regardless of the output signal from the pressure detector, and when the variation in output signal from the pressure detector is less than a second predetermined value as a result of such driving of said fluid pump energizing a signal to indicate that the system is out of order.
    Type: Grant
    Filed: March 14, 1994
    Date of Patent: May 9, 1995
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventor: Shinichi Inagawa
  • Patent number: 5132664
    Abstract: An overload warning system for a trailer brake cylinder of a trailer brake system having a nominal deceleration rate. It has been found that previous temperature sensing overdue warning systems have a disadvantage that undue delay occurs and that no warning signal is initiated until after damage to the trailer brakes occurs. The present invention proposes that the tractor brake system and the trailer brake system compare their received operating control signals from which they form a ratio factor and then produce a warning signal when the ratio factor changes beyond a predetermined critical change velocity. The present invention employs the rapid drop in braking force caused by a brake overload and uses the rapid drop and increase brake demand for readjusting the brake deceleration. The present invention is used for uniquely recognizing the "Fading" effect of the trailer brake system.
    Type: Grant
    Filed: August 20, 1990
    Date of Patent: July 21, 1992
    Assignee: WABCO Westinghouse Fahrzeugbremsen GmbH
    Inventors: Joachim Feldmann, Manfred Schult
  • Patent number: 5083274
    Abstract: A railroad brake pressure recorder for use with both analogue and digital break pressure manifolds monitors the signal on its analogue air brake pressure input connector. If the signal on this input exceeds a predetermined frequency, inputs are processed as coming from an analogue manifold. If it is less than this frequency, the inputs are processed as coming from a digital manifold.
    Type: Grant
    Filed: February 28, 1990
    Date of Patent: January 21, 1992
    Assignee: Pulse Electronics, Inc.
    Inventors: Angel P. Bezos, Emilio A. Fernandez
  • Patent number: 5046313
    Abstract: A master cylinder (12) having a switch (70) which is activated by either a magnet (78) carried by a float (76) in a reservoir (40) or a pin (66) moved by a differential area piston (52). The switch (70) had a first blade (82) connected a source of electrical current (106) through an indicator light (124) and a second blade (88) connected to an electrical ground (114). A reed switch (100) is connected to the first (82) and second (88) blades and responds to the magnet to close an electrical circuit to operate the indicator light (124) if a low fluid level is present in the reservoir (40). A first contact (96) on the first blade (82) is positioned in switch 70 by a non-electrical conductive actuation pin (66) that extends through the housing (22) of the master cylinder (12).
    Type: Grant
    Filed: July 27, 1989
    Date of Patent: September 10, 1991
    Assignee: Allied-Signal Inc.
    Inventors: Donald A. Crumb, William F. Dillon, Jr., Robert F. Gaiser, Richard A. Zander
  • Patent number: 5016442
    Abstract: A master cylinder having a housing with a first bore therein for retaining a pair of pistons which move in response to an input force and develop fluid pressure to effect a brake application. A second bore in the housing carries a differential area piston connected to the pressure chambers. A reed switch retained in the housing is aligned with a first magnet located on a float in a reservoir and a second magnet is attached to the differential area piston. A ferromagnetic shield located between the reed switch and second magnet has first and second openings located in a plane on either side of the reed switch. Should a failure occur in either pressure chamber, the differential area piston moves to allow magnetic field to pass through the openings in the shield and activate the reed switch to develop a warning signal and inform an operator of a failure mode condition in the master cylinder.
    Type: Grant
    Filed: July 27, 1989
    Date of Patent: May 21, 1991
    Assignee: Allied-Signal Inc.
    Inventors: Richard A. Zander, Robert F. Gaiser, Donald A. Crumb
  • Patent number: 4937553
    Abstract: An electrohydraulic device is suggested for continuously monitoring the pressure in a hydraulic brake system for automotive vehicles, in particular for outputting electric control signals in dependence upon applied pressure signals, the said device being composed of a housing containing two coaxial bores, a receiver arranged in the housing and applicable by the inlet pressure, as well as a converter for converting the hydraulic pressure into an electric output signal.To devise a structurally simple, reliable device of cost-efficient manufacture, the instant invention provides that the receiver is formed of a membrane made of amorphous metal with changing permeability which coacts with a coil system used as a converter, the output signals of which can be supplied to an evaluating electronic system.
    Type: Grant
    Filed: July 14, 1988
    Date of Patent: June 26, 1990
    Assignee: Alfred Teves GmbH
    Inventor: Dietrich Juckenack
  • Patent number: 4848847
    Abstract: A pressure supply system for the generation of the auxiliary pressure of a hydraulic brake system for motor vehicles comprises an accumulator, a hydraulic pump driven by electromotive force and a pressure switch (1) controlling the turning on and off of the hydraulic pump. The pressure switch (1) includes a switch piston (2) having a piston rod (5) mechanically actuating in a pressure-responsive manner, successively, two or three switches (8,9,10). The pump motor (26), by way of these switches, and by way of a relay, is turned on when a bottom pressure limit value (P.sub.U) is reached, and turned off when the upper pressure limit value (P.sub.O) is reached and exceeded. A holding circuit is connected in the electric circuit, in which are provided the switches (8,9,10) of the pressure switch (1), which holding circuit ensures an abrupt switch-over of the relay into the other switching position when a slow approach of a pressure (p) to the pressure limit values (p.sub.U, P.sub.
    Type: Grant
    Filed: October 22, 1986
    Date of Patent: July 18, 1989
    Assignee: Alfred Teves GmbH
    Inventors: Hans D. Reinartz, Helmut Steffes, Franz Latka
  • Patent number: 4841158
    Abstract: A safety relay circuit for operating electric systems of automotive vehicles is disclosed. The circuit includes two series-connected change-over relays connecting the vehicle's electrical system to the operative voltage. The change-over relays are actuated by switches acted upon by a control circuit. The control circuit assures that the change-over relays are actuated alternatively.
    Type: Grant
    Filed: March 8, 1988
    Date of Patent: June 20, 1989
    Assignee: Alfred Teves GmbH
    Inventor: Franz Latka
  • Patent number: 4824182
    Abstract: An anti-lock hydraulic brake system which includes a brake pressure generator composed of a master cylinder, a brake power booster inserted upstream thereof and a pressure modulator interposed between the master cylinder and the brake power booster. A resetting unit is formed by supplementing the pressure modulator with a valve assembly which connects a resetting chamber of the pressure modulator to either a pressure-compensating reservoir or an auxiliary-pressure source. The braking pressure in the wheel brakes is controlled, according to a time-multiplex method, by wheel valves inserted into the pressure-fluid conduits and by the pressure modulator. In order to check the operability of the brake and of the anti-lock control system, a pressure switch is connected to the pressure modulator and a test circuit is provided which, at predetermined points of time, initiates a test cycle, actuates the valves and compares the valves' operation with the reaction of the pressure switch.
    Type: Grant
    Filed: September 4, 1987
    Date of Patent: April 25, 1989
    Assignee: Alfred Teves GmbH
    Inventors: Helmut Steffes, Norbert Ocvirk, Gunther Buschmann, Anton David, Johannes Graeber, Otto Determann, Ivica Batistic