Slip-controlled brake system for commercial vehicles

• US 5,634,700 A
• Filed: 03/07/1996
• Issued: 06/03/1997
• Est. Priority Date: 03/10/1995
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Walter, Manfred, Decker, Heinz
• Primary Examiner(s): Young, Lee W.
• Application Number:
  US08/612,136
• Time in Patent Office: 453 Days
• Field of Search: 303/186, 303/187, 303/188, 303/189, 303/113.5, 303/119.1, 303/113.1
• US Class Current: 303/186
• CPC Class Codes: B60T 2270/203 hydraulic system components
• CPC Class Codes: B60T 8/1708 for lorries or tractor-trailer combinations
• CPC Class Codes: B60T 8/175 Brake regulation specially adapted to prevent excessive wheel spin during vehicle acceleration, e.g. for traction control safety devices for propulsion unit control responsive to, or preventing, skidding of wheels B60K28/16
• CPC Class Codes: B60T 8/321 deceleration B60T8/34, B60T8/52, B60T8/54, B60T8/56, B60T8/58, B60T8/72, B60T8/86, B60T8/88 take precedence
• CPC Class Codes: B60T 8/322 Systems specially adapted for vehicles driven by more than one axle, e.g. Four Wheel-Drive vehicles
• CPC Class Codes: B60T 8/4809 Traction control, stability control, using both the wheel brakes and other automatic braking systems
• CPC Class Codes: B60T 8/5012 Pressure reapplication using a plurality of valves in parallel
• CPC Class Codes: B60T 8/5081 Pressure release using a plurality of valves in parallel

Abstract

A slip-controlled brake system for commercial vehicles with a hydraulic transmission device for which the cost of the system is reduced. Each axle of the vehicle is assigned a hydraulic control unit, with an electronic control unit, of a slip-control device for passenger vehicles. The hydraulic control unit has four hydraulic channels (K1, K2, K3, K4). Brake lines which connect a master cylinder of the brake system to wheel cylinders are routed in each case via two channels (K1, K2, K3, K4) of the hydraulic control unit, which are connected in parallel, in order to achieve a sufficiently large volume flow of pressure medium. Connected to the corresponding control unit are two wheel speed sensors assigned to the wheels of the respective vehicle axle. The control units are connected electrically for the exchange of wheel speed sensor signals. The brake system can be implemented in an advantageous manner on light commercial vehicles.

Claims

1. A slip-controlled brake system with a hydraulic transmission device for commercial vehicles with at least two axles, having the following features:

a master cylinder (2) is provided from which brake lines (3, 3.1, 3.2;

4, 4.1, 4.2) lead to wheel cylinders (11, 12;

13,

     14),

each axle (7,

     10) of the vehicle is assigned a hydraulic unit (17,

     18), with an electronic control unit (19,

     20), of a slip-control device for passenger vehicles,

the hydraulic unit (17,

     18) has four hydraulic channels (K1, K2, K3, K4),

the brake lines (3, 3.1, 3.2;

4, 4.1, 4.2) connected to the wheel cylinders (11, 12;

13,

     14) are routed via in each case two channels (K1, K2;

K3, K4) of the hydraulic unit (17,

     18), which are connected in parallel,

two wheel speed sensors (23, 24;

25,

     26) assigned to the wheels of the respective vehicle axle (7,

     10) are connected to the control unit (19,

     20),

the control units (19,

     20) are connected electrically at least for the exchange of wheel speed sensor signals.

2. A hydraulic brake system as claimed in claim 1, wherein the hydraulic units (17, 18) together with their control units (19, 20) are arranged close to the axles.

3. A hydraulic brake system as claimed in claim 1, wherein in the case of a driven vehicle axle, the slip control device is designed not only for brake slip control but also for traction control.