Abstract: A vehicle electricity storage device includes a capacitor unit for supplying stored electric power to an electronically controlled system, and a microcomputer including a memory. The memory stores a plurality of thresholds (internal resistance limit values) different from each other. Each of the plurality of thresholds is to be compared with an electrical characteristic value (internal resistance value) related to the capacitor unit for determining a deterioration state of the capacitor unit. The each of the plurality of thresholds is stored in association with an identification ID for identifying the electronically controlled system. The microcomputer acquires the identification ID from the electronically controlled system. And the microcomputer selects, from the plurality of thresholds, a threshold associated with the identification ID acquired. Then the microcomputer determines the deterioration state of the capacitor unit by using the electrical characteristic value and the threshold selected.

Abstract: A method of detecting electrical failures in a wind turbine generator control system is described. The method comprises sending a test pulse through a signal path within the control system and detecting the test pulse once it has passed through the signal path, measuring a current through the signal path, and determining an input status and/or an output status of the signal path. Then, the nature of the electrical failure is identified based on a combination of the detected test pulse, the measured current and the determined input status and/or output status of the signal path.

Abstract: A method for monitoring a solenoid valve, the method including: applying a test signal on one side of the solenoid valve, the solenoid valve having a control coil for controlling an air pressure in a brake cylinder of an electro-pneumatic brake, wherein the solenoid valve has a supply voltage side, at which the control coil takes up an electric supply current, and a reference potential side, at which the control coil delivers the electric supply current; tapping a measurement signal on the other side of the solenoid valve; and determining the state of the solenoid valve based on a juxtaposition of the test signal and of the measurement signal. Also described are a related control apparatus, an electro-pneumatic brake, and a computer readable medium.

Abstract: An apparatus and method for resistive short circuit immunity for wheel speed sensor interface on a braking system. In one embodiment the apparatus includes a first circuit for generating a first periodic signal based on first current transmitted to a wheel speed sensor and a second circuit for generating a second periodic signal based on second current, some or all of which is received from the wheel speed sensor. A circuit is provided for selecting the first periodic signal for output if a magnitude of the second current is greater than a magnitude of the first current, or the second periodic signal for output if a magnitude of the second current is not greater than the magnitude of the first current. The selected first or second periodic signal contains information relating to a speed of a wheel that is associated with the wheel speed sensor.

Abstract: A circuit comprises a cycle-cycle detector, configured to receive a synthesized clock signal, and detect a cycle difference index signal between any two neighboring cycles of the synthesized clock signal, wherein the synthesized clock signal is combined by a plurality of phase shifted signals; a demultiplexer connected to the cycle-cycle detector, configured to convert the cycle difference index signal into a plurality of parallel data signals; and a first state machine, connected to both the demultiplexer and the cycle-cycle detector, configured to generate a tuning signal based on the parallel data signals, and feed the tuning signal back to the cycle-cycle detector; wherein the cycle-cycle detector is further configured to adjust delay time of the synthesized clock signal according to the tuning signal.

Abstract: A power-assisted braking system for a vehicle is described, including: a brake master cylinder having a chamber which is hydraulically connected to a wheel brake cylinder for braking a wheel of the vehicle; a hydraulic actuator which activates a piston of the brake master cylinder in order to pressurize the hydraulic fluid in the chamber; a low-pressure accumulator which stores the hydraulic fluid under pressure, and the actuator for activating the piston of the brake master cylinder; a pump which supplies the hydraulic fluid from the tank to the low-pressure accumulator; and a drive device which drives the pump. A method for controlling a power-assisted braking system is also described.

Abstract: The invention relates to a hydraulic brake system comprising a master brake cylinder the at least one working chamber of which is connected to the wheel brakes of the vehicle via at least one hydraulic line, the brake piston of at least one wheel brake being adjustable by a negative pressure in the hydraulic lines to produce a brake clearance.

Abstract: A brake-by-wire system uses a time sequence type that determines road conditions before initialization, initializes EWBs (Electro Wedge Brake) at the left/right front wheels and EMBs (Electro Mechanical Brake) at the left/right rear wheels with time differences on the basis of the determined road conditions. Therefore, the clamping force in at least any one of the EWBs and the EMBs is maintained in any circumstances, thereby avoiding a situation that all the braking force of a vehicle is removed.

Abstract: A brake system for a vehicle has a first and a second brake control device, four wheel actuator devices, and a first and a second signal line, the first signal line connecting the first brake control device to two of the four wheel actuator devices and the second signal line connecting the second brake control device to the two other wheel actuator devices, each of the four wheel actuator devices in the active state being additionally designed to detect whether a specified number of brake control devices and/or wheel actuator devices are in the inactive state, in which case a specified braking torque is exerted on the wheel of the vehicle associated with the brake control device.

Abstract: A brake system includes an electric brake force generator for braking a wheel of a vehicle by a driving force of an electric motor. A problem determination device is provided in which the problem determination device sends an electrical signal to the electric motor such that the electric motor rotates in a direction opposite that of the direction of rotation to generate a brake force. If a rotation of the electric motor is not detected, then the problem determination device determines that a problem has occurred.

Abstract: A trouble diagnosis device of a vehicle body acceleration sensor by determining that the output fixing trouble of the vehicle body acceleration sensor or the like is not generated at a point of time that the fluctuation width of the output value of a vehicle body acceleration sensor becomes a predetermined value or above during the traveling of the vehicle with the vehicle speed equal to or more than the predetermined speed, and by stopping the trouble diagnosis of the output fixing trouble of the vehicle body acceleration sensor or the like until the vehicle speed is lowered to a value less than the predetermined speed thereafter, it is possible to avoid the trouble diagnosis of the output fixing trouble of the vehicle body acceleration sensor or the like when that the trouble diagnosis of the output fixing trouble of the vehicle body acceleration sensor or the like is unnecessary.

Abstract: An electric brake system for an aircraft as described herein electrically actuates brake mechanisms in a seamless manner when a power interrupt condition is experienced. While operating in an autobraking mode and in response to a power interrupt condition, the electric brake system preserves the last brake actuation command generated by the autobrake function. After normal operating power is reestablished, the last brake actuation command is retrieved and processed by the electric brake system. While operating in a pedal braking mode and in response to a power interrupt condition, the electric brake system discards the last brake actuation command generated from brake pedal interaction. After normal operating power is reestablished, the brake pedal data is refreshed to generate a new brake actuation command. These procedures reduce lurching and unexpected brake actuation levels following a power interrupt in the electric brake system.

Abstract: A braking system for a motor vehicle includes a hydraulic circuit for producing a brake force, the hydraulic circuit having a pressure source for producing a hydraulic pressure and a pressure store, the pressure store of the hydraulic circuit being able to be supplied with hydraulic fluid from a delivery side of the pressure source if necessary. In this braking system, there is provision for the pressure store to be able to be coupled in fluidic terms to an intake side of the pressure source by means of an interposed actively controllable multi-way valve, in particular a two-way solenoid valve, and for the pressure store to be able to be decoupled therefrom.

Abstract: The output of a wheel speed sensor is sampled at dithered time intervals and the samples used to construct a pair of histograms representing high and low sample values. A minimum voltage threshold is determined as a function of the output voltage associated with the dominate histogram value for the low sample values. The output voltage associated with the dominant histogram value for the high sample values is compared to the minimum voltage threshold to determine whether a potential sensor wiring problem is developing.

Abstract: A method is provided for detecting a fault condition in a hydraulic brake system of a vehicle having a first hydraulic brake circuit and a second hydraulic brake circuit. A correlation ratio is determined between a measured pressure and the actual vehicle acceleration. A first wheel velocity differential is determined and a second wheel velocity differential is determined. A weighting value is selected in response to determining whether the correlation ratio is within the predetermined range and whether the first wheel velocity differential and the second wheel velocity differential are opposite signs. The selected weighting value is added to a fault counter. A determination is made whether the fault counter is equal to or greater than a predetermined threshold. A fault condition is detected in response to the fault counter greater than or equal to the first predetermined threshold.

Abstract: A drivetrain protection and management system (DPMS) monitors and determines individual wheel speeds to detect wheel spin and slip conditions on a drive axle. Wheel spin is caused by low surface friction, excessive input torque, lack of inter-axle differential and differential locks, excessive operating temperatures, or poor driving techniques. When wheel spin or slip exceeds a threshold, the DPMS automatically controls input torque to the drive axle by controlling engine or retarder torque. In addition to monitoring wheel speeds, the DPMS monitors other vehicle characteristics such as engine torque/speed, transmission ratio, transmission output speed, vehicle speed, throttle position, for example. The DPMS monitors and stores these vehicle characteristics over time and generates a data output that summarizes a history of vehicle operating conditions. The DPMS can communicate this data output real time during vehicle operation, which can be used by a fleet to maximize vehicle performance.

Abstract: The invention relates to an architecture for a braking system for an airplane fitted with a plurality of undercarriages each carrying a plurality of wheels, at least some of which are fitted with brakes, the architecture comprising at least two braking computers each having two modules such that in each computer, one of the modules controls a first fraction of the brakes and the other module controls a second fraction of the brakes complementary to the first. According to the invention, the architecture is configured to operate in any one of the following modes of operation: a first normal mode in which both modules of one of the braking computers are active for controlling all of the brakes; a second normal mode in which both modules of the other braking computer are active for controlling all of the brakes; and an alternative mode in which one module of one of the braking computers and one module of the other braking computer are active for controlling all of the brakes.

Abstract: A power supply apparatus for a vehicle. An electronic controller outputs information for controlling braking of a vehicle. A battery supplies electric power to a brake via the electronic controller. A power supply backup unit as an auxiliary power supply includes a capacitor unit formed of a plurality of capacitors and a detection unit for detecting an abnormality in the capacitor unit, and supplies electric power to the brake when the battery is in an abnormal state. In charging or discharging the capacitor unit, the detection unit measures an internal resistance value of the capacitor unit, and measures an internal capacitance value from the rate of change of voltage per unit time. The detection unit judges whether or not the capacitor unit is in a normal state based on the internal resistance value and the internal capacitance value.

Abstract: The invention discloses a method for determining the air content of the brake fluid in a hydraulic braking system. This method also permits determining the quality of the bleeding of the braking system. The principle of the method is a comparison of the volume intake with the respectively achieved pressure. The correlation is compared to nominal values. As the volume intake is determined by the clearance, the system is set by means of a pre-actuation to an initial condition before each actual measurement.

Abstract: A failure check apparatus for a control apparatus of a vehicle such as ABS. When the failure check apparatus performs initial check for the ABS, it successively activates each of solenoid valves and a motor provided in the ABS, one at a time, for a predetermined time so as to determine whether a failure has occurred in the ABS. At that time, activation of the motor is started when a certain delay time elapses after the end of activation of the last solenoid valve. The delay time is a time which the vibration generated in the control apparatus upon activation of the last solenoid valve converges. Thus, interference between a vibration wave (sound wave) generated upon actuation of the solenoid valves and a vibration wave (sound wave) generated upon actuation of the motor, which differ in nature of vibration, is prevented.

Abstract: An anti-lock brake system for a tri-axle wheeled vehicle equipped with wheel speed sensors and modulators for adjusting brake pressure. The modulators are actuated by a six-channel electronic control unit. The modulators associated with the front axle of the vehicle are individually actuated. The modulators associated with the two rear axles of the vehicle are side-by-side or axle modulators, each actuated jointly by respective end stages of the six channels. The electronic control unit detects whether the anti-lock brake system in which it is installed is a compatible anti-lock brake system. An error signal indicating improper installation is delivered.

Abstract: An anti-lock brake system for a tri-axle wheeled vehicle equipped with wheel speed sensors and modulators for adjusting brake pressure. The modulators are actuated by a six-channel electronic control unit. The modulators associated with the front axle of the vehicle are individually actuated. The modulators associated with the two rear axles of the vehicle are side-by-side or axle modulators, each actuated jointly by respective end stages of the six channels. The electronic control unit detects whether the anti-lock brake system in which it is installed is a compatible anti-lock brake system. An error signal indicating improper installation is delivered.

Abstract: A vehicle motion control device which detects an abnormality of an automatic hydraulic pressure generator having a master cylinder, a booster which boosts the master cylinder and a booster actuator which actuates the booster irrespective of brake pedal operation and performs an appropriate transaction upon detecting the abnormality. The vehicle motion control device includes the automatic hydraulic pressure generator, a hydraulic pressure control valve disposed between the automatic hydraulic pressure generator and a wheel cylinder, and a controller performing the automatic pressure increase control by actuating the hydraulic pressure control valve and the booster actuator according to the vehicle running condition.

Abstract: An anti-lock brake system for a tri-axle wheeled vehicle equipped with wheel speed sensors and modulators for adjusting brake pressure. The modulators are actuated by a six-channel electronic control unit. The modulators associated with the front axle of the vehicle are individually actuated. The modulators associated with the two rear axles of the vehicle are side-by-side or axle modulators, each actuated jointly by respective end stages of the six channels. The electronic control unit detects whether the anti-lock brake system in which it is installed is a compatible anti-lock brake system. An error signal indicating improper installation is delivered.

Abstract: A remote manual control is provided for an electronic wheel brake controller. The remote manual control is connected to the wheel brake controller with a cable having quick disconnect connectors at each end. Accordingly, cables having different lengths may be easily substituted for connecting the remote manual control to the wheel brake controller.

Abstract: To monitor the emergency braking capability of an electro-hydraulic braking system (EHB) wherein, during normal operation, the brake pressure in the wheel brakes (8 to 11) is generated by means of a pressure source comprised of a hydraulic pump (18), an accumulator (16), and hydraulic valves, and wherein a switch-over to a hydraulic connection between a master cylinder (1) and the wheel brakes (8 to 11) is executed in the event of an emergency braking situation, the special feature includes that the emergency braking mode is tested at each initialization of the brake system using the steps mentioned in claim 1.

Abstract: The present invention provides an improved torque actuator control system using data inputs from an operator controlled input transducer relating to the desired torque output of a controlled member and inputs concerning the directly measured speed and torque of the controlled member. The improved torque actuator control circuit uses the inputs to generate an output command to the controlled member that results in the direct application of the desired torque output from the controlled member.

Abstract: An electro-hydraulic braking system of the type capable of operating in a brake-by-wire mode wherein hydraulic pressure is applied to braking devices at the vehicle wheels in proportion to the driver's braking demand as sensed electronically at a brake pedal, wherein when it is detected that there exists within the system a prescribed category of non safety-critical fault, it is arranged that the driver is caused to experience a modified, different to usual, travel/force behaviour characteristic through the braking pedal when braking.

Abstract: A method for monitoring a braking system contained in a vehicle. The braking system includes at least one brake circuit. The brake circuit, on the output side, contains valve configurations, to which wheel brake cylinders allocated to the brake circuit are connected. The braking system furthermore has at least one pump capable of delivering braking medium to at least two wheel brake cylinders. During predetermined vehicle states, the at least one pump is actuated and the first valve configurations are driven by predefined driving signals. Ascertained for at least one wheel of the vehicle during the actuation of the pump and the first valve configurations is a wheel-performance variable which describes the wheel performance, in particular the wheel-rotation performance, of the corresponding wheel. The braking system is checked for a first and/or second fault as a function of this wheel-performance variable.

Abstract: The invention relates to a circuit arrangement of a circuit of an electrically controlled brake force booster, including a first and a second line that supply two potentials to the connections of the actuator, an electronically actuated first switch provided in the first line, a control device that switches the first switch with a first, preferably pulse-width modulated, control signal, and an electronically actuated second switch provided in the second line, wherein the control circuit switches the second switch with a second control signal. A process for testing this circuit arrangement includes the step of testing at least one potential on at least one connection of the actuator when both switches are open.

Abstract: The present invention provides an improved torque actuator control system using data inputs from an operator controlled input transducer relating to the desired torque output of a controlled member and inputs concerning the directly measured speed and torque of the controlled member. The improved torque actuator control circuit uses the inputs to generate an output command to the controlled member that results in the direct application of the desired torque output from the controlled member.

Abstract: An electronically controlled brake system includes a brake actuator wherein a valve is electrically controlled to maintain the spring chamber in the non-actuated position during normal operation. However, should there be a failure in the electrical system, then the spring chamber is allowed to set the brake actuator. The “failure” could also include a diagnostic system included in the control which identifies a failure in control operation. In this way, should there be an electrical failure, either in the control or power circuits, the truck is stopped.

Abstract: A device and a method control units arranged in the power train of a motor vehicle. The vehicle has electrically actuated, wheel brakes, preferably designed with one or two motors. A control arrangement is provided that controls the functions of at least one of the units arranged in the power train and/or the function of the wheel brakes in an open or closed loop and which influence the potential of at least one of these units in response to a signal received. At least one electric storage arrangement is effectively connected to the electrically actuated brakes to supply them with power. The device and method utilize a diagnostic arrangement through which the potential of at least one of the energy storage arrangement is detected.

Abstract: A method and a device for check-testing a braking system in which, before travel commences, a self-test of the braking system is performed. During the course of the self-test, the valve arrangements allocated to the wheel brakes and the pressure supply providing the brake pressure are driven in a predefined manner. A plurality of test phases are provided, after whose respective conclusions, a pressure level to be expected should be reached. Otherwise a secondary braking operation is initiated at least for the subsequent operating cycle of the vehicle.