Antilock hydraulic brake system

摘要

In a brake system with slip control (Fig. 1), with a diagonal division of the brake circuits (I and II), the wheel brakes (31 to 34) are connected by way of main brake lines (62, 63) and branch lines (47 to 50) to the master cylinder (2) of the brake pressure transmitter (1), inlet valves (24, 25 and 29, 30), which are open in the absence of any current, being inserted into the branch lines. In addition inlet lines (45, 46) with non-return valves (38, 39) inserted into them are coupled to the main brake lines (62, 63), by way of which valves pressure medium is delivered into the brake circuits (I, II) by two hydraulic pumps (21, 26) in the event of any locking tendency of the vehicle wheels, which causes the pistons (6, 7) of the master cylinder (2) to return against the foot pressure (F). The wheel brakes (31 to 34) are finally connected by way of outlet valves (22, 23 and 35, 36), closed in the absence of current, to a return line (37), to which the suction line (61) of the two pumps (21, 26) is also connected. For positioning the working pistons of the brake master cylinder, flowmeters (90, 91) are provided, by means of which the volume of pressure medium remaining in the brake master cylinder can be determined. The volume is clearly linked to the position of the working piston. The delivery capacity of the pumps (21, 26) is determined as a function of the position of the working pistons, especially the position of the pushrod piston (6). This is done either by switching the drive M on and off, ... Original abstract incomplete. <IMAGE>