Vehicle brake system with anti-skid apparatus
First Claim
1. A vehicle brake system having a dual-circuit brake pressure source, two brake circuits (12, 13) and wheel brakes (7-10) associated with them for front and rear wheels, and an anti-skid apparatus (11), the anti-skid apparatus having two brake pressure modulators (16, 17) and two brake pressure adaptors (30, 31), each brake pressure adaptor (30, 31) has a cylinder (34) and piston (35) displaceable in said cylinder, said piston is acted upon by a pressure from an associated brake pressure modulator (16, 17) for control purposes, a check valve (37) is provided between the piston (35) and an associated connection (12, 13) of the master brake cylinder (3) with said cylinder (34), said check valve has a stationary valve seat (38), a movable closing element (39) and a valve closing spring (40) that acts on the valve closing element (39), the valve closing spring (40) is weaker than the restoring spring (36) and said check valve (37) is opened in a direction of the master brake cylinder in the event of a pressure excess of an associated rear wheel brake relative to the master brake cylinder (3), each brake pressure modulator being controllable as a function of a rotation behavior of an associated wheel, the wheels being distributed on two sides of the vehicle, and each brake pressure adaptor being hydraulically controllable by one of the brake pressure modulators at a time to adapt the brake pressure of a wheel brake connected to it to the brake pressure of the wheel brake that is directly connected to the brake pressure modulator, each brake pressure modulator is controllable as a function of a rotational behavior of one associated front wheel and is connected to that wheel brake, and a brake pressure adaptor connected to the respective brake pressure modulator is connected to a wheel brake of a rear wheel on the same side of the vehicle.
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Accused Products
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. In the novel vehicle brake system, each of the two wheel rotation sensors is assigned to a separate front wheel and controls one brake pressure modulator for its respective front wheel. The two rear wheel brakes are each coupled via a brake pressure adaptor to the brake pressure modulator on the same side. A pressure reduction for the right front wheel that is effected in anti-skid operation results in a pressure reduction in the same direction for the right rear wheel.
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Citations
20 Claims
- 1. A vehicle brake system having a dual-circuit brake pressure source, two brake circuits (12, 13) and wheel brakes (7-10) associated with them for front and rear wheels, and an anti-skid apparatus (11), the anti-skid apparatus having two brake pressure modulators (16, 17) and two brake pressure adaptors (30, 31), each brake pressure adaptor (30, 31) has a cylinder (34) and piston (35) displaceable in said cylinder, said piston is acted upon by a pressure from an associated brake pressure modulator (16, 17) for control purposes, a check valve (37) is provided between the piston (35) and an associated connection (12, 13) of the master brake cylinder (3) with said cylinder (34), said check valve has a stationary valve seat (38), a movable closing element (39) and a valve closing spring (40) that acts on the valve closing element (39), the valve closing spring (40) is weaker than the restoring spring (36) and said check valve (37) is opened in a direction of the master brake cylinder in the event of a pressure excess of an associated rear wheel brake relative to the master brake cylinder (3), each brake pressure modulator being controllable as a function of a rotation behavior of an associated wheel, the wheels being distributed on two sides of the vehicle, and each brake pressure adaptor being hydraulically controllable by one of the brake pressure modulators at a time to adapt the brake pressure of a wheel brake connected to it to the brake pressure of the wheel brake that is directly connected to the brake pressure modulator, each brake pressure modulator is controllable as a function of a rotational behavior of one associated front wheel and is connected to that wheel brake, and a brake pressure adaptor connected to the respective brake pressure modulator is connected to a wheel brake of a rear wheel on the same side of the vehicle.
Specification