Abstract:
First hydraulic-pressure supply piping extended from an accumulator is connected to a first supply port (that is, to a second pressure chamber) of a cylinder, and to second hydraulic-pressure delivery piping of an ABS via third hydraulic-pressure supply piping having a third linear valve. When the braking hydraulic pressure Pf is reduced in the ABS, the degree and the period of time that the third linear valve is opened are set according to the amount of fluid discharged from the second hydraulic-pressure delivery piping to a reservoir tank through a pressure-reducing valve so that a certain amount of fluid is returned from the first hydraulic-pressure supply piping to the second hydraulic-pressure delivery piping via the third hydraulic-pressure supply piping.
Abstract:
A hydraulic brake system for a vehicle, including at least one brake circuit which connects a master cylinder to at least one wheel brake, in which for each wheel brake, one inlet valve is provided, one pump, which pumps hydraulic fluid from a return line into a reservoir, and for each brake circuit present, there is one reservoir valve and one disconnection valve; the disconnection valve is located in the brake circuit between the master cylinder and the inlet valves; and the reservoir valve is located in a line from the reservoir to the brake circuit, and the line discharges into a line region of the brake circuit between the disconnection valve and the inlet valve.
Abstract:
In a motor vehicle having a brake system and a drive train, the brake system comprises a vehicle movement dynamics controller (10), a control group (40) for actuating brakes and a hydraulic unit with pressure medium supply (25, 27, 30) and wheel-specific hydraulic valves (43LV, 43RV, 43LH, 43RH) for activating the individual wheel brake cylinders (12LV, 12RV, 12LH, 12RH), and the drive system has at least one drive train (2, 3; 5, 7, 8) in which a controllable clutch (6) is arranged, which clutch (6) is activated by a clutch actuation means (40K), a hydraulic valve (43K) and an actuator (16). In order to make the vehicle as a whole cheaper but also bring about a functional improvement, the clutch controller of the drive system is integrated into the vehicle movement dynamics controller (10) of the brake system, and the hydraulic valve (43K) for activating the clutch (6) is connected to the pressure medium supply (25, 27, 30) of the brake system, and the modular control group 11.
Abstract:
A “drive by wire” system reverts to a safe condition if an error affecting safely is identified. The system includes a steerable wheel, a steering device, and control computers linked to sensor(s) which detect movement and position of the steering wheel. The system includes positioning devices mechanically coupled to the steerable wheel and controllable by one of the control computers and majority voting units. The positioning unit is actively controllable by its assigned control computer. The control computers determine their own condition and the condition of the system by model-based calculations, using measured values detected by the sensors and switch over from, the currently active control computer to the control computer assigned to the other positioning unit, if deviations from the model forecasts in a majority of the control computers are indicated.
Abstract:
A hydraulic brake booster (12) for use in a brake system (10) having a first housing (100) with a first bore (102) separated from a second bore (104). The first bore (102) retains a power piston (118) and the second bore (104) retains a control valve arrangement (170). A push rod (30) of an input arrangement (49) is connected to the power piston (118) and linked to the control valve arrangement (170) by a lever arrangement (50). A second housing (200) encloses the control valve arrangement (170), lever arrangement (50) and a projection (117) that extends from the power piston (118) to define a cavity or relief chamber (202) having a permanent low pressure. The input arrangement (49) supplies the control valve arrangement (170) with an input force in response to a braking force applied to the push rod (30) to regulate the communication of pressurized supply fluid from the second bore (104). The hydraulic brake booster is characterized in that the regulated supply fluid acts on the first piston (118) to develop a corresponding operational fluid pressure which is communicated to a first set of wheel brakes (14,14′) while the regulated supply fluid is directly communicated to a second set of wheel brakes (18,18′) to effect a brake application.
Abstract:
The steering device for vehicle changes the steering angle by transmitting the movements of the steering electrical actuator to the vehicle wheels. When the vehicle is steered in the stationary state, the hydraulic fluid can be supplied to the steering assistance force generating hydraulic actuator from the pump within the hydraulic pressure imparting unit. When the vehicle is not steered in the stationary state, the hydraulic fluid can be supplied to the brake device from the pump via the hydraulic pressure distribution unit.
Abstract:
A vehicle having a steering mechanism and a vehicle control system which cooperate to improve the performance of the vehicle and the vehicle control system. The vehicle also includes an input device adapted to produce a steering signal indicative of a manual steering input received from a vehicle operator. The steering mechanism has an input member operable for receiving a steering input and output member moveable in response to the steering input. The output member is positionable to control the direction in which the vehicle travels. The vehicle control system is operable for controlling a performance characteristic of the vehicle, and may include an anti-lock brake system, a traction control system or a stability system. The vehicle control system receives the steering signal and tailors its operation in response thereto. Preferably, the vehicle control system includes a control unit for selectively calculating a steering angle offset which is operable for causing the steering mechanism to reposition the vehicle wheels to further improve the performance of the vehicle control system and the vehicle. A method for controlling a vehicle is also provided.
Abstract:
A braking pressure boosting device is suggested, in particular for automotive vehicles, which includes a boost sensor for sensing or identifying the point of maximum boosting of the braking pressure boosting device. By using the boost sensor, ad signal is generated reporting the point of maximum boosting. This invention permits the manufacture of high-performance braking force boosting devices requiring minimal space and opens up new potential for economizing.
Abstract:
A vehicle hydraulic system is disclosed comprising a hydraulic fluid reservoir; a pressure force supplying pressurized hydraulic fluid to a discharge header; a fluid conduit between the discharge header and the reservoir; a back pressure valve operative in the fluid conduit to maintain a desired pressure in the discharge header; and a vehicle braking system having a hydraulically operated boost piston assembly for supplementing a force exerted by a vehicle operator to operate brakes of the vehicle braking system. The system further includes a boost pressure control valve responsive to an input from the vehicle operator for selectively directing pressured hydraulic fluid from the discharge header to the boost piston assembly and venting hydraulic fluid from the boost piston assembly to the reservoir.
Abstract:
A braking system generally provides pressure equalization between the sides of a split braking circuit. The amount of equalization provided is limited to enable the introduction of purposely induced pressure variances. A result is that unintentional pressure variations are moderated and intentional target pressure variations are easily obtainable. The braking system provides power braking operation in response to a manually actuated master cylinder. Fluid pressure is transmitted through isolation valves directly to the wheel brakes. The braking system also provides power operation in response to a powered pump. The pump delivers pressurized fluid through a controllable supply valve. When the supply valve is open, the isolation valve(s) are shifted to provide open fluid communication path between proportional pressure control valves and the wheel brakes. The pressure equalization effecting device is isolated from the master cylinder pressurized circuit during base brake operation.