Control system for a vehicle

• US 6,502,908 B1
• Filed: 05/01/2000
• Issued: 01/07/2003
• Est. Priority Date: 04/30/1999
• Status: Expired due to Term

• Current Assignee: Daimler AG (Mercedes-Benz Group AG)
• Original Assignee: DaimlerChrysler AG (Mercedes-Benz Group AG)
• Inventors: Mueller, Armin, Roehrig-Gericke, Thomas, Schoeb, Reinhold, Troester, Harry
• Primary Examiner(s): Graham, Matthew C.
• Assistant Examiner(s): SY, MARIANO ONG
• Application Number:
  US09/561,899
• Time in Patent Office: 981 Days
• Field of Search: 303/177, 303/155, 303/157, 303/158, 303/144, 303/191, 303/176, 701/70, 188/DIG.2
• US Class Current: 303/191
• CPC Class Codes: B60T 7/042 by electrical means, e.g. using travel or force sensors
• CPC Class Codes: B60T 7/12 for automatic initiation; for initiation not subject to will of driver or passenger limiting speed of vehicles other than rail vehicles B60K31/00
• CPC Class Codes: B60W 10/04 including control of propulsion units
• CPC Class Codes: B60W 10/18 including control of braking systems
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2540/12 Brake pedal position
• CPC Class Codes: B60W 30/17 with provision for special action when the preceding vehicle comes to a halt, e.g. stop and go
• CPC Class Codes: B60W 30/18018 Start-stop drive, e.g. in a traffic jam
• CPC Class Codes: B60W 30/1819 Propulsion control with control means using analogue circuits, relays or mechanical links
• CPC Class Codes: Y10S 188/02 Hill holder

Abstract

A control system for a vehicle has a detection device for generating signals which describe the operating and vehicle state. The latter signals are supplied to a regulating and control unit which generates actuating signals for switching on and off a vehicle component that influences a brake servo device for automatically producing braking force if the accelerator pedal is not actuated by the driver. This “acceleration—automatic braking” mode is triggered if the brake pedal has been actuated in a prescribed manner within a defined period of time.

Claims

1. A control system for a vehicle having an accelerator pedal and a brake pedal, comprising:

a detection device for producing signals which describe operation and state of the vehicle, including actuation of the brake pedal and the accelerator pedal;

a brake servo device for automatically applying a braking force to the vehicle; and

a control unit which receives signals produced by the detection device, and generates actuating signals for switching on and off the brake servo device;

wherein

said control unit commences an “

acceleration by driver—

automatic braking”

mode of said vehicle in response to detection of a predetermined pattern of control actions by an operator; and

of the vehicle

during a time when the vehicle is in said “

acceleration by driver—

automatic braking”

mode, said control unit such that the brake servo device is switched on only when the accelerator pedal is in a released state, and is switched off only when the accelerator pedal is in an actuated state.

2. A control system according to claim 1, wherein the “

acceleration by driver—

automatic braking”

mode is set if the brake pedal is actuated at least twice in succession within a defined period of time.

3. The control system according to claim 1, wherein the vehicle must be decelerated to a halt in each braking operation to trigger the “

acceleration by driver—

automatic braking”

mode.

4. The control system according to claim 2, wherein a minimum deceleration must be achieved in each braking operation to trigger the “

acceleration by driver—

automatic braking”

mode.

5. The control system according to claim 1, wherein the brake pedal must be at least partially released between two successive braking operations to trigger the “

acceleration by driver—

automatic braking”

mode.

6. The control system according to claim 1, wherein the brake pedal must be depressed fully at least once to trigger the “

acceleration by driver—

automatic braking”

mode.

7. The control system according to claim 1, wherein the “

acceleration by driver—

automatic braking”

mode is indicated in the vehicle.

8. The control system according to claim 1, wherein a brake pressure corresponding to a predetermined characteristic curve is built up in the brake servo device during the braking phase in the “

acceleration by driver—

automatic braking”

mode.

9. The control system according to claim 1, wherein said servo brake device causes an application of vehicle brakes according to a deceleration characteristic curve.

10. The control system according to claim 9, wherein braking is performed at a constant deceleration rate.

11. The control system according to claim 1, wherein the vehicle can be braked to a halt in a braking phase in the “

acceleration by driver—

automatic braking”

mode.

12. The control system according to claim 1, wherein brake pressure is maintained in the “

acceleration by driver—

automatic braking”

mode when the vehicle is stationary if the accelerator pedal remains unactuated.

13. The control system according to claim 12, wherein slope of a road is determined and brake pressure is adjusted to correspond to said slope so that the vehicle remains stationary.

14. The control system according to claim 1, wherein in the “

acceleration by driver—

automatic braking”

mode, a vehicle parking brake is actuated whenever the accelerator pedal remains unactuated and the vehicle is stationary.

15. The control system according to claim 1, wherein the “

acceleration by driver—

automatic braking”

mode is canceled if at least one vehicle state variable exceeds a limiting value.

16. The control system according to claim 15, wherein the vehicle state variable is vehicle speed.

17. The control system according to claim 15, wherein the vehicle state variable is steering-wheel angle.

18. A method of controlling operation of a vehicle having an accelerator pedal and vehicle brakes, comprising:

detecting occurrence of a predetermined pattern of control actions by an operator of the vehicle;

in response to detection of said predetermined pattern of control actions, commencing an automatic braking mode;

during said automatic braking mode, controlling acceleration and deceleration of said vehicle by activating and deactivating an automatic braking operation of said vehicle brakes as a function of an operation state of said accelerator input by said operator, such that automatic braking operation is activated only when said accelerator pedal is in a released state, and is deactivated only when said accelerator pedal is in a depressed state.

19. A method of controlling operation of a vehicle having an accelerator pedal and vehicle brakes according to claim 18 wherein said pattern of control actions comprises a predetermined sequence of brake actuations implemented by a vehicle driver.

20. The method of controlling operation of a vehicle according to claim 18, wherein said predetermined pattern of control actions comprises a predetermined pattern of brake pedal actuations by said operator.

21. Apparatus for controlling operation of a vehicle having an accelerator pedal and vehicle brakes, comprising:

means for detecting occurrence of a predetermined pattern of control actions by an operator of the vehicle;

means, operative in response to detection of said predetermined pattern of control actions, for controlling acceleration and deceleration of said vehicle by activating and deactivating an automatic braking operation of said vehicle brakes as a function of an operation state of said accelerator pedal input by said operator, such that automatic braking is activated only when said accelerator pedal is in a released state, and is deactivated only when said accelerator pedal is in a depressed state.

22. The method of controlling operation of a vehicle according to claim 21, wherein said predetermined pattern of control actions comprises a predetermined pattern of brake pedal actuations by said operator.