Abstract: A device for supplying pressure to an actuation unit of a vehicle brake system, in particular to a vehicle brake system of the ‘brake-by-wire’ type, including a pneumatic motor-and-pump assembly with a pump and a motor driving the pump, wherein the motor-and-pump assembly is controlled by an electronic control unit depending on a pressure level or pressure difference in a pneumatic brake booster of the actuation unit, with the pressure level in a chamber or a difference in pressure between two chambers of the brake booster being detected by a sensor. In order to maintain the availability of the service brake function as high as possible and to obtain a maximum possible redundancy, the control unit, used to control the motor-and-pump assembly includes a logic module and a power module, which are arranged separately of each other.

Abstract: A device for supplying pressure to an actuation unit of a vehicle brake system, in particular to a vehicle brake system of the ‘brake-by-wire’ type, comprising a pneumatic motor-and-pump assembly with a pump and a motor driving the pump, wherein the motor-and-pump assembly is controlled by an electronic control unit depending on a pressure level or pressure difference in a pneumatic brake booster of the actuation unit, with the pressure level in a chamber or a difference in pressure between two chambers of the brake booster being detected by means of a sensor. In order to maintain the availability of the service brake function as high as possible and to obtain a maximum possible redundancy, the control unit, used to control the motor-and-pump assembly comprises a logic module and a power module, which are arranged separately of each other.

Abstract: A device for supplying pressure to an actuation unit of a vehicle brake system, in particular to a vehicle brake system of the ‘brake-by-wire’ type, comprising a pneumatic motor-and-pump assembly with a pump and a motor driving the pump, wherein the motor-and-pump assembly is controlled by an electronic control unit depending on a pressure level or pressure difference in a pneumatic brake booster of the actuation unit, with the pressure level in a chamber or a difference in pressure between two chambers of the brake booster being detected by means of a sensor. In order to maintain the availability of the service brake function as high as possible and to obtain a maximum possible redundancy, the control unit, used to control the motor-and-pump assembly comprises a logic module and a power module, which are arranged separately of each other.

Abstract: A method for monitors the functions and increases the operational reliability of a complex safety-relevant control system. Examples of such control systems include motor vehicle control systems such as a brake system (ABS, TCS, ESP, EHB, EMB), a steering aid (“steering-by-wire”), etc. The method also detects and evaluates system errors. The method detects a system error and evaluates as a group error, brings about a complete system degradation or a partial system degradation corresponding to the group error, e.g. limitation of the system functions and the system availability, localizes the system error and the error source by tests, logical combining of the test results, plausibility considerations, etc. and gradually cancels the restrictions of the system functions and enhances the system availability in dependence on the result of the individual steps for bounding or localizing the system error and the error source.

Abstract: Disclosed is a brake system for a motor vehicle having actuating unit (1) consisting of a brake booster (2) operable by a brake pedal (5) and actuatable independently of the driver's. A master brake cylinder (3) connected downstream of the brake booster (3), to which master brake cylinder wheel brakes (13, 14, 15, 16) of a motor vehicle are connected, an element (21) to detect a deceleration request of the driver, a hydraulic control unit (HCU) (17) for performing driving-dynamics related control operations (ABS, ESP, TCS . . . ), which is connected between the master brake cylinder (3) and the wheel brakes (13, 14, 15, 16) and includes at least one hydraulic pump (24a, b), a first electronic control unit (7) which is associated with the actuating unit (1) and serves to actuate the brake booster (2), a second electronic control unit (12) which is associated with the hydraulic control unit (HCU) (17) and serves to drive the components thereof.

Abstract: A device for supplying pressure to an actuation unit of a vehicle brake system, in particular to a vehicle brake system of the ‘brake-by-wire’ type, comprising a pneumatic motor-and-pump assembly with a pump and a motor driving the pump, wherein the motor-and-pump assembly is controlled by an electronic control unit depending on a pressure level or pressure difference in a pneumatic brake booster of the actuation unit, with the pressure level in a chamber or a difference in pressure between two chambers of the brake booster being detected by means of a sensor. In order to maintain the availability of the service brake function as high as possible and to obtain a maximum possible redundancy, the control unit, used to control the motor-and-pump assembly comprises a logic module and a power module, which are arranged separately of each other.

Abstract: A method for monitoring the functions and increasing the operational reliability of a complex safety-relevant control system, e.g. a motor vehicle control system, such as a brake system (ABS, TCS, ESP, EHB, EMB), a steering aid (‘steering-by-wire’), etc., and for detecting and evaluating system errors comprises the steps of: detecting a system error and evaluation as a group error, bringing about a complete system degradation or a partial system degradation corresponding to the group error, e.g. limitation of the system functions and the system availability, localizing the system error and the error source by tests, logical combining of the test results, plausibility considerations, etc. and gradually canceling the restrictions of the system functions and enhancing the system availability in dependence on the result of the individual steps for bounding or localizing the system error and the error source.

Abstract: The present invention relates to an electro-hydraulic brake system for motor vehicles which is controllable in a ‘brake-by-wire’ operating mode by the vehicle operator as well as independently of the vehicle operator, and which can be operated in a back-up operational mode where only operation by the vehicle operator is possible. The brake system includes an emergency pressure generator or master brake cylinder which has at least one pressure chamber and is operable by way of a brake pedal, and a hydraulic auxiliary pressure source whose pressure is used to act upon wheel brakes that are connectable to the master brake cylinder by way of at least one hydraulic connection closable by a separating valve, as well as an electronic control and regulating unit.

Abstract: The present invention relates to methods for controlling an electrohydraulic brake system which represent types of emergency braking operating modes being actuated when various malfunctions occur, such as a malfunction caused by a mechanical fault of one of the pressure control valves, of a pressure sensor used to determine the wheel brake pressures, a high-pressure accumulator serving a an auxiliary-pressure source or a pump cooperating with the high-pressure accumulator, a separating valve closing the connections between the wheel brakes and an emergency pressure generator or master brake cylinder as well as when a loss in pressure occurs in any of the wheel brakes associated with the front or the rear axle.

Abstract: To monitor the emergency braking capability of an electro-hydraulic braking system (EHBwherein, during normal operation, the brake pressure in the wheel brakes is generated by means of a pressure source comprised of a hydraulic pump, an umulator, and hydraulic valves, and wherein a switch-over to a hydraulic connection between a master cylinder and the wheel brakes is executed in the event of an emergency braking situation. With predetermined events, e.g.

Abstract: The present invention relates to an electro-hydraulic brake system for motor vehicles which is controllable in a ‘brake-by-wire’ operating mode by the vehicle operator as well as independently of the vehicle operator, and which can be operated in a back-up operational mode where only operation by the vehicle operator is possible. The brake system includes an emergency pressure generator or master brake cylinder which has at least one pressure chamber and is operable by means of a brake pedal, and a hydraulic auxiliary pressure source whose pressure is used to act upon wheel brakes that are connectable to the master brake cylinder by way of at least one hydraulic connection closable by means of a separating valve, as well as an electronic control and regulating unit.

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: A circuit configuration for a vehicle with electronic anti-lock control having circuits for individual control of the braking pressure variation in the wheel brakes of the wheels of one vehicle axle and for limiting the yawing moment owing to braking pressure differences. Circuits (6) detect the pressure reduction signals (PA1, PA2) individually per wheel and determine the pressure difference (DA12) from these signals. In the case of different friction values (.mu.-split situation), the mean pressure build-up gradient at the high-value wheel is varied as a function of the pressure difference (DA12) and the vehicle deceleration. At the time of the appearance of the peak yawing moment, namely directly before the low-value wheel will reenter the stable range, the braking pressure at the high-value wheel will be reduced by a value dependent on the vehicle deceleration and on the pressure difference.