Anti-skid and traction control system
AssigneeRobert Bosch GmbH
InventorsWolf-Dieter Jonner, Lothar Kirstein
Life of this patent
Estimating the term…
Abstract
A traction control system adapted to an anti-skid control system including a third valve assembly disposed between a pressure fluid container and a first valve assembly, a line is established to an inlet of a pump which in the traction control situation pumps a quantity of pressure fluid at a certain pressure into a line, closed off by a second valve assembly, between the first valve assemblies and the second valve assembly.
Claims30
An anti-skid and traction control system for vehicles including driven wheels, each of the wheels of which is assigned a wheel brake cylinder, a multi-circuit master cylinder, a brake line which communicates between said multi-circuit master cylinder and each of said wheel brake cylinders, at least one pressure fluid container connected with said master cylinder, at least one first valve assembly assigned to one of the driven wheels and located in the brake line, control means for switching said valve assembly in an anti-skid and traction control situation to different switching positions for at least pressure buildup and pressure reduction at a wheel brake, a second valve assembly, associated with at least one of the brake circuits, said second valve assembly located between said mutli-circuit master cylinder and said first valve assembly, said second valve assembly controls a brake fluid communication between said multi-circuit master cylinder and said first valve assembly in one of the brake circuits only in the traction control situation, at least one self-priming pump, said pump includes an inlet side and an outlet side, said inlet side upon pressure reduction is connectable by said first valve assemblies to the wheel brake cylinders, and by means of which pump, pressure fluid can be pumped from the outlet side into the brake line between the first and second valve assembly, a third valve assembly secured in said brake line between said pressure fluid container and said first valve assemblies, said third valve assembly existing between the pressure fluid container and the first valve assemblies of one brake circuit is openable and closable and the inlet side of the at least one self-priming pump also communicates with the third valve assembly via a line segment (13), which is open in the traction control situation, a first pressure-controlled valve (33) which opens in the direction of the pressure fluid container (1) is disposed in a return line (32) originating at said second valve assembly (5) and communicates with the pressure fluid container (1), said second valve assembly (5) in the anti-skid control situation shuts off the return line (32) toward the brake line (3) and in the traction control situation opens the return line (32) toward the brake line (3) between the second valve assembly (5) and the first valve assemblies (7, 7a).
An anti-skid and traction control system for vehicles, each of the wheels of which is assigned a wheel brake cylinder that communicates via a brake line with a multi-circuit master cylinder and at least one pressure fluid container, at least one first valve assembly assigned to one of the driven wheels and located in the brake line, said valve assembly, in the anti-skid and traction control situation, assumes switching positions for at least pressure buildup and pressure reduction at a wheel brake, a second valve assembly, associated with at least one of the brake circuits, located between the multi-circuit master cylinder and the first valve assembly, by means of said second valve assembly a communication between the multi-circuit master cylinder and the first valve assembly in one of the brake circuits is controllable only in the traction control situation, at least one self-priming pump having an inlet side and an outlet side, the inlet side of which, upon pressure reduction, is connectable by the first valve assemblies to the wheel brake cylinders, and by means of said pump, pressure fluid is pumped into the brake line between the first and second valve assembly, a third valve assembly assigned to at least one driven wheel by means of said third valve assembly, a communication existing between the pressure fluid container and the first valve assemblies of one brake circuit is openable and closable, and the inlet side of the at least one self-priming pump also communicates with the third valve assembly via a line segment (13), which is open in the traction control situation, a return line (32) which bypasses the second valve assembly is provided with a first pressure-controlled valve (33) opening toward the multi-circuit master cylinder (2), which valve (33) leads to the brake line (3) between the second valve assembly (5) and the multi-circuit master cylinder (2), said second valve assembly (5) in the anti-skid control situation effects a shutoff of the return line (32) toward the brake line (3) and in the traction control situation effects an opening of the return line (32) toward the brake line (3) between the second valve assembly (5) and the first valve assemblies (7, 7a).
An anti-skid and traction control system for vehicles, each of the wheels of which is assigned a wheel brake cylinder that communicates via a brake line with a multi-circuit master cylinder and at least one pressure fluid container, at least one first valve assembly assigned to one of the driven wheels and located in the brake line, said valve assembly in an anti-skid and traction control situation, is capable of assuming switching positions for at least pressure buildup and pressure reduction at a wheel brake, a second valve assembly associated with at least one of the brake circuits and located between the multi-circuit master cylinder and the first valve assembly, by means of said second valve assembly a communication between the multi-circuit master cylinder and the first valve assembly in one of the brake circuits is controllable only in the traction control situation, at least one self-priming pump having an inlet side and an outlet side, the inlet side upon pressure reduction is connectable by the first valve assemblies to the wheel brake cylinders, and by means of said pump, pressure fluid can be pumped into the brake line between the first and second valve assembly, said self-priming pump (21) is connected with a first inlet (57) of a first pump element (53) to a supplementary pressure fluid container (66) and via a further line (82) and a check valve (67) opens in the direction of the first inlet (57) to the second valve assembly (5), and in the traction control situation a fourth valve assembly (65) controls the communication of an outlet (56) of the first pump element (53) with an inlet (58) of a second pump element (54) of the pump (21), wherein in a position (29) of the second valve assembly (5) shutting off the brake line (3) between the multi-circuit master cylinder (2) and the first valve assemblies (7, 7a), the brake line (3) between the further valve assembly (5) and the first valve assemblies (7, 7a) can be made to communicate with the further line (82).
An anti-skid and traction control system for vehicles, each of the wheels of which is assigned a wheel brake cylinder that communicates via a brake line with a multi-circuit master cylinder and at least one pressure fluid container, at least one first valve assembly assigned to one of the driven wheels and located in the brake line, said at least one valve assembly in the anti-skid and traction control situation, is capable of assuming switching positions for at least pressure buildup and pressure reduction at a wheel brake, a second valve assembly associated with at least one of the brake circuits and located between the multi-circuit master cylinder and the first valve assembly, by means of said second valve assembly a communication between the multi-circuit master cylinder and the first valve assembly in one of the brake circuits is controllable only in the traction control situation, at least one self-priming pump having an inlet side and an outlet side, said inlet side upon pressure reduction is connectable by the first valve assemblies to the wheel brake cylinders, and by means of said pump, pressure fluid is pumped into the brake line between the first and second valve assembly, a supplementary feed pump (72) having an inlet (73) and an outlet (74), said supplementary feed pump is connected with its inlet (73) to the pressure fluid container (1, 66) and its outlet (74) is connectable to a connection with the first valve assemblies (7, 7a), and that a first pressure-controlled valve (33) opening in the direction of the pressure fluid container (1, 66) is disposed in a return line (32) originating at the second valve assembly (5) and communicating with the pressure fluid container (1, 66), wherein the second valve assembly (5), in an anti-skid situation, effects a shutoff of the return line (32) toward the brake line (3) and in the traction control situation effects an opening of the return line (32) toward the brake line (3) between the second valve assembly (5) and the first valve assemblies (7, 7a).
Dependencies are inferred from the claim text.