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US 4,523,792 AGranted
Dual-circuit hydraulic brake system
AssigneeITT Industries, Inc.
InventorsJuan Belart, Jochen Burgdorf
Life of this patent
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AssigneeITT Industries, Inc.
InventorsJuan Belart, Jochen Burgdorf
Estimating the term…
A dual-circuit hydraulic brake system with slip control, in particular for automotive vehicles, in which there are provided several sensors sensing the rotational behavior of the wheels and several solenoid valves (39, 37, 40, 38 41, 42, 30, 31) which are controllable by slip monitoring electronics (32). The wheel brakes (33, 34, 35, 36) connected to the brake circuits may be pressurized by a tandem master cylinder (3), on the one hand, and by an auxiliary pressure source, on the other hand. The auxiliary pressure source consists of an electric-motor-driven pressure medium pump (20) and of an accumulator (21). Each working chamber of the tandem master cylinder (3) hydraulically communicates with a brake valve (16) which may generate a dynamic pressure which, upon the actuation of the brake, will be supplied to wheel brakes (33, 34, 35, 36) by a switching-over action of inlet valves (30, 31). The inlet valves (30, 31) are additionally controllable by a differential pressure alarm switch (44) connected at the working chambers of the tandem master cylinder (3). This prevents dynamic pressure medium from entering a defective brake circuit, the intact brake circuit remaining operative in the usual manner.
A dual-circuit hydraulic brake system with slip control for automotive vehicles of the type having a plurality of sensors sensing the rotational behavior of the wheels and with a plurality of solenoid valves controllable by slip monitoring electronic devices, in which wheel brakes of the brake system connected to the brake circuits may be pressurized by a tandem master cylinder and by an auxiliary pressure source, with said auxiliary pressure source comprising an electric-motor-driven pressure medium pump and an accumulator, wherein each working chamber of the tandem master cylinder (3) communicates with a brake valve (16), wherein the brake valve (16) can generate a dynamic pressure which, upon the actuation of the brake, is supplied to the wheel brakes (33, 34, 35, 36) by a switching-over action of inlet valves (30, 31), and wherein the inlet valves (30, 31) are additionally controllable by a differential pressure alarm switch (44) having inputs respectively connected to the working chambers of the tandem master cylinder (3).
Dependencies are inferred from the claim text.