Abstract: A brake stroke simulator for achieving good stroke feeling in a vehicular brake apparatus has a first piston being displaceable by receiving a master cylinder pressure, and a second piston disposed so as to form a gap between the second piston and the first piston. A plug is disposed so as to form another gap between the plug and the second piston. A first spring is disposed between the first piston and the second piston so as to urge the pistons away from each other. A second spring is provided for urging the second piston away from the plug. The brake stroke simulator is able to reduce the characteristic variations among individual products.

Abstract: A brake pressure control system is proposed which operates on the fluid-return principle. This system includes a low pressure accumulator which must be emptied upon termination of a braking operation with brake pressure control. In this way, the emptying period is kept as short as possible. To this end, the pump is driven for a defined period. In this emptying period, the motor is controlled by pulse-width modulation, and the electromotive counterforce is measured in the phases of the control signal in which no voltage is applied to the motor. This counterforce is a standard of the rotational speed of the motor or the rotational speed of the connected pump. When the rotational speed or the rotational speed variation exceeds a given value, this can be considered as an indication that the low pressure accumulator is empty. As soon as such a signal appears, the emptying period is terminated by deactivation of the motor.

Abstract: A brake hydraulic pressure circuit for increasing the speed of pressure increase at the wheel cylinder by the simple hydraulic circuit. An accumulator is connected to the discharging side of the pump of the hydraulic return circuit via a first switching valve. A hydraulic supplying circuit, branching from the line between the first switching valve and the accumulator, is connected to the suction side of the pump of the hydraulic returning circuit via a second switching valve. Brake fluid reserved in the accumulator is then supplied to the main hydraulic circuit and is supplied to the suction side of the pump via the hydraulic supply circuit.

Abstract: A fluid pressure source apparatus includes a pump, an accumulator for receiving pressure from the pump, a pressure switch for detecting the pressure in the accumulator, an electric motor for driving the pump, and a motor control device for driving the motor when the pressure switch detects a low pressure. A current detecting device detects a motor current value of the motor and a control unit determines whether the accumulator or the motor is experiencing an abnormality based on the motor current value. The control unit determines whether the motor current value occurring during a first set time following the start of driving of the motor is greater than a first set value. If the motor current value is not greater than the first set value, the control unit determines that the current detecting device is experiencing an abnormality. If there is no such abnormality information, the control unit compares the motor current value with predetermined values.

Abstract: A vehicle brake control device includes a wheel cylinder mounted on a wheel of a vehicle, a master cylinder which generates a brake fluid pressure according to the amount of operation of the brake pedal and supplies the brake fluid pressure to the wheel cylinder, a pump which draws brake fluid out of a reservoir for generating a brake fluid pressure, and an accumulator which stores the brake fluid pressure generated by the pump. A change-over valve is disposed between the master cylinder and the wheel cylinder to disconnect the wheel cylinder from the master cylinder during its non-operational condition and to connect the wheel cylinder to the master cylinder during its operational condition A fluid conduit connects the accumulator to the wheel cylinder during the non-operational condition of the change-over valve, and a regulator is disposed on the fluid conduit to regulate the fluid pressure in the accumulator according to the amount of brake pedal operation.

Abstract: A brake force control apparatus performs both a brake assist control and an antilock brake control without interference therebetween. A master cylinder generates a brake fluid pressure corresponding to a magnitude of a brake operation. A pump has an inlet port and an outlet port, the inlet port being communicable with the master cylinder. An inlet control valve controls communication between the master cylinder and the inlet port of the pump. A wheel cylinder is communicable with each of the master cylinder and the outlet port of the pump. A supplementary reservoir is communicable with each of the wheel cylinder and the inlet port of the pump. The brake assist control is performed, when the emergency brake operation is performed by the driver, by opening the inlet control valve and actuating the pump.

Abstract: A media divider has a divider piston, which is received in a cylinder bore and embodied as a tubular deep-drawn part. Two pairs of a sealing ring and an annular guide part disposed side by side are provided, whose axial spacing is defined by at least one spacer bushing disposed coaxially with the divider piston. The two pairs comprising the sealing ring and guide part as well as the spacer bushing may be axially fixed either in the cylinder bore or on the divider piston. The media divider may be used in the form of a plunger or as a reservoir in a fluid-carrying brake system.

Abstract: An electronically controllable brake actuation system for automotive vehicles includes a master brake cylinder, a simulator interacting with the master brake cylinder, a pressure source drivable by an electric control unit and by which wheel brakes of the vehicle are pressurizable, the wheel brakes being connectable to the master brake cylinder by at least one hydraulic connection that is closable by a separating valve, a device for the identification of the driver's wish for deceleration, each one inlet and outlet valve connected upstream or, respectively, downstream of the wheel brakes, and wheel sensors sensing the rotational behavior of the vehicle wheels. To improve the meterability of braking pressure of a system of the above type, especially in the range of low pressure values, the pressure source is configured as at least one continuously adjustable piston-and-cylinder assembly having a pressure chamber to which the wheel brakes are connected by the intermediary of the inlet valves.

Abstract: A secondary source of braking for large hydraulically braked vehicles utilizing the available power source (38) provided by typically available anti-skid and traction control braking systems. The invention improves the time response of a secondary braking traction control system by utilizing stored fluid in the low pressure anti-skid braking system accumulators (34) to provide for faster build of pressure by the pump motor (38). Fluid is stored and utilized based on vehicle behavior and operational states and is based upon the principal the traction control, anti-skid braking and secondary braking requirements are generally mutually exclusive. This allows for a decreased response time of the secondary braking system and also provides for improved initial cycle response of typical traction control events that utilize the system configuration.

Abstract: A hydraulic control unit for a hydraulic vehicle control system, such as anti-lock brakes, includes a hydraulic accumulator including a housing that defines a cavity and a passageway that extends from the cavity and that is adapted for inner-connection with a host hydraulic circuit, preferably adjacent the high pressure outlet of the host system hydraulic pump. A closure member cooperates with the housing to substantially seal the cavity. A pre-loaded elastomeric member is disposed within the cavity and is compressible with increasing hydraulic fluid pressure to attenuate short duration pressure pulses therein.

Abstract: The present invention relates to a hydraulic automotive vehicle brake system with brake slip control and automatic brake management for traction control and driving dynamics control including a braking pressure generator which is hydraulically connectable with at least one wheel brake and a pressure fluid accumulator by way of pressure modulation valves, a pump which is connected with its suction side to the pressure fluid accumulator and with its pressure side to a pressure fluid conduit which extends from the braking pressure generator to the wheel brake and accommodates the pressure modulation valves. The pressure fluid accumulator is partially charged, to which end a pressure fluid connection between the pressure fluid accumulator and the suction side of the pump can be closed. Upon attainment of the maximum partial charge, excessive pressure fluid volume can be withdrawn from the pressure fluid accumulator, and the capacity of the pressure fluid accumulator is not exhausted.

Abstract: An accumulator for an anti-lock brake system includes a valve body portion defining an accumulator chamber, an accumulator piston slidably disposed within the accumulator chamber, a spring, and a cover. The accumulator chamber has a fluid inlet for connection to a source of pressurized fluid at a first end of the chamber. The chamber has a second end open to atmosphere. The accumulator piston separates the first end of the chamber from the second end of the chamber. The spring is disposed in the accumulator chamber between the piston and the second end of the chamber and biases the piston toward a first position. The cover closes the second end of the chamber and atmosphere and has micro-porous structure. The micro-porous structure is configured to block water molecules and to pass constituent molecules of air, thereby enabling air to be communicated across while preventing the intrusion of water into the chamber through the second end.

Abstract: The present invention relates to an electronically controllable brake actuation system for automotive vehicles, including a master brake cylinder operable by way of an actuating pedal, braking pressure generators actuatable by an electronic control unit and directly connected to the wheel brakes of the vehicle, the braking pressure generators being connectable to the master brake cylinder by way of hydraulic connections closable by valve assemblies, at least one sensor device to identify the driver's wish for deceleration, and at least one simulator chamber which interacts with the master brake cylinder.

Abstract: A hydraulic bake system with electronic anti-lock control includes a multi-circuit braking pressure generator, electrically operable hydraulic valves, low-pressure accumulators which accumulate the pressure fluid that is withdrawn from the wheel brakes in the period of braking pressure reduction wheel sensors, and circuits are used to evaluate the sensor signals and to generate braking pressure control signals. The braking pressure in each wheel is controlled individually by the hydraulic valves. The filling ratio of the low-pressure accumulators or the residual volume is constantly determined and the pressure fluid discharge to the low-pressure accumulators is modified in the course of a control operation as a function of the length of the control and the filling ratio. Initially, there are no restrictions on the anti-lock function, while the rate of fluid flow is drastically reducted in the course of control.