Electrical brake system

• US 5,952,799 A
• Filed: 08/27/1997
• Issued: 09/14/1999
• Est. Priority Date: 08/27/1996
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Blessing, Peter, Otterbein, Stefan, Maisch, Wolfgang
• Primary Examiner(s): IP, SHIK LUEN PAUL
• Application Number:
  US08/920,619
• Time in Patent Office: 748 Days
• Field of Search: 318/370-379, 318/16, 318/801, 303/7, 303/111, 303/20, 303/110, 303/21 AF, 303/92, 701/70, 364/426.01, 370/85
• US Class Current: 318/362
• CPC Class Codes: B60T 13/662 characterised by specified functions of the control system components
• CPC Class Codes: B60T 2270/82 Brake-by-Wire, EHB
• 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

Abstract

An electronic brake system for a vehicle which has control modules for adjusting the braking force at the wheels of the vehicle, a control module which determines at least the driver'"'"'s braking command, and at least one communications system which connects the modules to each other, where, to supply the elements with energy, at least two independent vehicle electrical systems (E₁, E₂) are provided, at least one of the elements being connected to an electrical system different from that to which the other elements are connected.

Claims

1. Electric braking system for a vehicle, comprising:

a control unit (10) which determines at least the driver'"'"'s braking requirement;

control modules (A, B) which control the braking force at the wheels of the vehicle based upon the driver'"'"'s braking requirement;

at least one communication system (K1, K2), which connects the control unit (10) with the control modules (A, B) for transmitting data between the control unit and the control modules; and

at least two mutually independent electrical systems (E1, E2) for power supply, the control unit (10) is connected with the at least two electrical systems for power supply, whereby the control modules (A, B) are each only connected with one of the at least two electrical systems for power supply.

2. A brake system according to claim 1, wherein the control module detecting the driver'"'"'s braking command is connected to two communications systems, each of which are independent of each other.

3. A brake system according to claim 1, wherein the control modules actuate groups of wheel brakes, each control module being connected by way of separate communications systems to the control module for detecting the braking command and to a processing unit.

4. A brake system according to claim 1, wherein a processing unit is provided which executes higher-level functions such as driving dynamics control, antilock protection, and drive slip control.

5. A brake system according to claim 4, wherein the higher-level functions are calculated in one of the control modules, said control module being connected by way of a communications system to a pedal unit and to at least one other control module, and in the event of a defect, said module receiving substitute variables from the pedal unit over connecting lines.

6. A brake system according to claim 1, wherein the control modules drive electrically motorized brake actuators.

7. A brake system according to claim 1, and a communications system connecting a pedal unit to the control modules, and additional communications links independent thereof over which, in the event of a defect, substitute variables can be transmitted from the pedal unit to the control modules.

8. A brake system according to claim 1, wherein the higher-level functions are executed by a pedal unit.

9. A brake system according to claim 1, and further comprising connecting control modules to a pedal unit, and connecting lines parallel to the communications systems, over which substitute variables are transmitted from the pedal unit to the control modules.

10. A brake system according to claim 1, wherein each of the control modules are assigned to the brakes of a respective set of wheels, said sets being the wheels on an axle of said vehicle, or diagonal wheels.

11. Electric braking system for a vehicle, comprising:

a control unit (10) which determines at least the driver'"'"'s breaking requirement;

control modules (A, B) which control the braking force at the wheels of the vehicle based upon the driver'"'"'s braking requirement;

an evaluation unit (18) which determines desired values representing the braking forces at each wheel;

at least one communication system (K1, K2), which connects the control unit (10) with the evaluation unit (18) and with the control modules (A, B) for transmitting data between these elements, wherein the control unit (10) determines the desired values (FH, FV) representing the braking forces to be applied at the brakes of the rear axle and the front axle respective based on the driver'"'"'s braking requirement, and where the evaluation unit (18) forms the desired values (F1 to F4) representing the braking forces to be applied at the wheels of the vehicle based on the desired values formed by the control unit (10), and where the control modules (A, B) control the wheel brakes based on at least one of the desired values forming by the control unit (10) and by the evaluation unit (18).

12. Electric braking system for a vehicle, having actuators (20, 22, 24, 26) at each wheel being controlled by actuation signals, comprising:

a control unit (10) which determines at least the driver'"'"'s braking requirement;

control modules (A, B) which control the braking force at the wheels of the vehicle based upon the driver'"'"'s braking requirement;

at least one communication system (K1, K2), which connects the control unit (10) with the control modules (A, B) for transmitting data between the control unit and the control modules;

separate communications lines between the control unit and the control modules, whereby the control unit (10) determines desired values (F1 to F4) based on the driver'"'"'s braking requirement and the control unit (10) further determines actuation signals (i1r, i2r, i3r, i4r) based on the driver'"'"'s braking requirement and sends the actuation signals via said separate communication lines to the control modules, the control modules controlling the wheel brakes based on at least one of the desired values and the actuation signals.