Abstract: An electronic braking system which recognizes differential braking across an axle. A stored adaptive capability is provided whereby a braking controller is able to learn the braking imbalance and correct for this by introducing differential pressure adjustments such as increasing braking at the wheel of the lower brake output and/or reducing braking at the wheel with a higher brake output. The learning process is completed over selected parts of several vehicle stops and is repeated continuously.

Abstract: A process for ensuring a neutral vehicle handling during cornering and a simultaneous load change is provided by the operation of a vehicle system having at least one driven axle, an axle differential gear, wheel brakes for the selective deceleration of an individual wheel, a device for recognizing a cornering and a device for recognizing a coasting operation and for generating a signal corresponding to the intensity of the coasting operation. The problem of rear-wheel driven and front-wheel driven vehicles is the vehicle handling during cornering in the coasting operation. As a result, depending on the method of operation, an oversteering or understeering of the vehicle is caused. The process avoids these problems in that, during a cornering, a wheel of the driven axle is decelerated at least as a function of the coasting operation signal such that the moment generated thereby, such as a counter-yawing moment, compensates the yawing moment caused by the cornering during the coasting operation.

Abstract: In a braking-force distribution control system for a vehicle, which is capable of controlling the ratio of a braking liquid pressure for front wheels to a braking liquid pressure for rear wheels based on a comparison of front and rear wheel speeds, a correcting factor is calculated in a correcting factor calculating device based on the ratio of front and rear wheel rotational speeds detected by front and rear wheel rotational speed sensors. At least one of front and rear wheel speeds, calculated in front and rear wheel speed calculating devices, is corrected by a wheel speed correcting device prior to the calculation of a control quantity in a control quantity calculating device. A control determining device determines whether the range of variation in correcting factor is equal to or larger than a preset value.

Abstract: A control device for an automotive vehicle comprises a differential disposed between wheels or wheel axles of a vehicle an antiskid brake control device to control an antiskid brake device which is capable of adjusting a brake pressure applied to a brake device of the vehicle to prevent wheels of the vehicle from locking, a differential limiting control device having a differential limiting device being capable of controlling and transferring a differential limit to the differential, and operating to decrease the differential limit while the antiskid brake device is operating, such that when either the antiskid brake control device or said differential control device fails, the non-failing control device receives a failure signal from the failing control device and the non-failing control device controls the vehicle towards a stable condition or increases a brake force.

Abstract: A differential limiting torque control system for an automotive vehicle with an anti-skid brake control system (ABS) and a limited slip differential (LSD), comprises sensors for detecting a deceleration, a lateral acceleration, and a drive-wheel speed difference between the right and left drive wheels, and an active LSD controller responsive to both the detected deceleration and the detected lateral-acceleration for deriving a first target torque and responsive to the detected drive-wheel speed difference for deriving a second target torque. The controller adjusts a differential limiting torque applied to the LSD to a higher one of the first and second target torques, only during operation of the ABS.

Abstract: An anti-slip brake, traction slip control (TSC) brake system is described for normally isolating the master cylinder from the output of a pump activated during anti slip brake control. The brake line is furnished with a non-return valve prevents pump pressure from being communicated to the master cylinder except when a high-pressure accumulator is fully charged by the pump, causing the non-return valve to be opened. A self priming pump is utilized having a pump chamber initially defining a flow path from the master cylinder to the brake line. The wheel brakes communicate via an outlet valve and a return line with the pump chamber, while an interposed second suction valve is provided in the return line, having an opening pressure in excess of 1 bar. Brake shunt lines connect each of the wheel brakes with the master brake cylinder, via a TSC-valve, closed during traction slip control.

Abstract: A brake pressure control apparatus having a master cylinder, a front wheel cylinder and a rear wheel cylinder is provided with a brake circuit for connecting the master cylinder to the front wheel cylinder, a normally open valve unit arranged in series with respect to the brake circuit, a return circuit arranged in parallel with respect to the brake circuit, a normally closed valve unit installed in the return circuit, a reservoir unit installed in the return circuit and a pump unit installed in the return circuit. A controlling unit is provided for controlling the operations of the normally open valve unit, the normally closed valve unit and the pump unit so as to regulate the brake pressure. A cut off valve unit is interconnected between the master cylinder and the rear wheel cylinder for cutting off the rear wheel cylinder from the master cylinder while the controlling unit regulates the brake pressure.

Abstract: A hydraulic brake system with an anti-skid system (ABS) and traction control (ASR) for motor vehicles having a hydraulic unit with at least one control valve and a return pump with at least one pump element embodied as self-aspirating, which element is operative in the brake circuit containing the at least one driven wheel. To furnish brake pressure during traction control, a valve assembly is provided. For the sake of simplicity in the embodiment of this valve unit, it has not only a charge valve disposed in an intake line between the pump element and the brake fluid tank but also a reversing valve, incorporated between the master brake cylinder and the control valve and having three hydraulic control inlets and a restoring spring, of which one control inlet communicate with the outlet of the pump element, and the two control inlets counteracting this control element communicate with the valve inlet and outlet, respectively.

Abstract: An anti-lock braking system (ABS) for a vehicle is provided which in a preferred embodiment includes a controller for signalling the system to an ABS mode, a master cylinder for supplying fluid, an actuator having a bore with a first port connecting the bore with the master cylinder and a second port spaced from the first port connecting the bore with a brake, a first check valve separating the bore into a first chamber exposed to the first port and a second chamber exposed to the second port, and an orifice restricting flow between the brake and the master cylinder via the first and second chambers. A piston is mounted in the second chamber, the piston in a fully actuated position open the first check valve. A threaded driver translates the piston and is powered by a motor. A parallel path connects the master cylinder with the brake parallel to the first and second chambers of the actuator.

Abstract: An integrated anti-lock braking (ABS)/traction control (TC) braking system is provided which includes a controller cognizant of a rotational condition of a wheel, a master cylinder, an actuator with a bore, the bore having a first fluid connection with a master cylinder and space therefrom a second fluid connection with a brake, a first normally open solenoid valve for isolating the master cylinder from the wheel brake when the controller places the system in an ABS or TC mode, and a hollow primary piston mounted within the bore along first, second and third spaced sealed peripheries having a first port connecting the interior of the primary piston with its exterior between the first and second sealed peripheries and communicating with the second fluid connection of the bore.

Abstract: Single drive slip control system for starter aid in which a slipping wheel is made to slow down to a speed approaching that of the other wheel. The brake line between the master cylinder and the wheel cylinder of each driven wheel is interrupted by a valve arrangement with an electrovalve, and further by a pressure generator downstream of the valve arrangement. When an evaluation circuit senses slippage of a driven wheel, the electrovalve is closed and the pressure downstream is increased. When pressure is produced by the master cylinder, the electrovalve is reopened. To ensure that the valve reopens, the valve arrangement includes a pressure controlled valve which is opened by a pressure build-up in a control chamber connected to the master cylinder through a check valve. A throttle valve in parallel with the check valve permits pressure reduction in the control chamber after braking.

Abstract: A known vehicle brake system having four wheel brakes, belonging to two brake circuits, for four wheels has an anti-skid apparatus with two electrically controllable brake pressure modulators, two wheel rotation sensors, and two brake pressure adaptors. The wheel rotation sensors are assigned to one front wheel and one diagonally opposed rear wheel, and each controls one brake pressure modulator, which belongs to the same wheel as the wheel rotation sensor. The brake pressure of a wheel brake located on the same axle on the opposite side of the vehicle is also controlled by a brake pressure modulator via a brake pressure adaptor. If only one wheel rotation sensor is provided per axle, only the wheel associated directly with the wheel rotation sensor can be braked optimally. The other wheel on the same axle may be overbraked or underbraked. This interferes with controllability of the vehicle and/or may have the disadvantage of overly long stopping distances.

Abstract: The pressure in the wheel brake of the system is controlled by an inlet valve 15 and an outlet valve 17 activated in response to the system controls. Fluid pressure from the pumps 13, is supplied to the wheel brake through the inlet valve 15, and discharged from the wheel brake through the outlet valve 17. By inserting a differential pressure limiter valve ahead of the inlet valve 15, the noise generated by the inlet valve is substantially reduced. A valve body 45 carries both the limiter valve seat and a discharge check valve seat, and respective closure balls 61, 62.

Abstract: An antilock brake system comprises a valve (20) in the flow path of the hydraulic fluid between a master cylinder (10) and a brake cylinder (18). To obtain on braking without antilock control a rapid pressure buildup in the brake cylinder (18) and a throttled pressure buildup when braking with antilock control, a valve (20) is provided in the hydraulic connecting conduit (14, 14', 14") between the master and brake cylinders and comprises a floating piston (50) which is subjected on the one side to the pressure of the hydraulic fluid in the master cylinder (10) and on its other side to the pressure of the hydraulic fluid in the brake cylinder (18). The floating piston (50) controls the valve in such a manner that when the pressure in the master cylinder (10) is greater by a predetermined amount than the pressure in the brake cylinder (18) only a throttled flow through the valve (20) is possible.

Abstract: An anti-skid apparatus having a valve, which is embodied to form a pressure limiting device between the outlet of a return pump and a master brake cylinder. As a consequence, a high-pressure reservoir can be of smaller capacity and can therefore be less expensive, since the pressure limiting device protects the pressure reservoir and other hydraulic elements from a pressure overload.