Vehicle

• US 6,588,858 B2
• Filed: 06/15/2001
• Issued: 07/08/2003
• Est. Priority Date: 06/16/2000
• Status: Expired due to Fees

• Current Assignee: Daimler Chrysler Company LLC (Stellantis NV)
• Original Assignee: Daimler Chrysler Company LLC (Stellantis NV)
• Inventors: Steiner, Stefan, Ritz, Steffen
• Primary Examiner(s): Lavinder, Jack
• Assistant Examiner(s): Pezzlo, Benjamin A
• Application Number:
  US09/881,975
• Publication Number:
  US 20020060103A1
• Time in Patent Office: 753 Days
• Field of Search: 303/140, 180/248, 701/41
• US Class Current: 303/140
• CPC Class Codes: B60K 17/346 the transfer gear being a differential gear
• CPC Class Codes: B60T 2270/303 Stability control with active acceleration
• CPC Class Codes: B62D 11/08 using brakes or clutches as main steering-effecting means
• CPC Class Codes: B62D 9/00 Steering deflectable wheels not otherwise provided for steering positon indicators B62D15/02

Abstract

A vehicle includes four wheels, a drive axle, a power train which connects a vehicle engine to the drive axle via a transmission, a clutch, and an axle differential, a brake system, which may brake at least the wheels associated with the drive axle independently of the other wheels, a steering system which includes a manual steering device, at which a driver may set a steering angle for steerable wheels, and a control system, which brakes at least the drive axle wheel inside the curve and generates a steering-supporting braking torque on this wheel below a predefined vehicle velocity and as of a predefined steering angle. In order to improve the steering support, the control system monitors the status of the transmission and/or the clutch, the control system actuating the brakes of the appropriate wheel as a function of this status in order to generate the steering-supporting braking torque.

Claims

1. A vehicle, comprising:

at least four wheels;

at least one drive axle;

a vehicle engine;

a power train connecting the vehicle engine to the drive axle, the power train including at least one transmission, at least one clutch and at least one axle differential;

a brake system configured to brake at least the wheels associated with the drive axle independently of other wheels;

a steering system having a manual steering device configured to set a steering angle for steerable wheels; and

a control system configured to determine a need for steering support below a predefined vehicle velocity and as of a predefined steering angle, to brake at least the drive axle wheel inside a curve, to generate a steering-supporting braking torque on the drive axle wheel, to monitor a status of at least one of the transmission and the clutch and to actuate the brakes of an appropriate wheel as a function of the status to generate the steering-supporting braking torque.

2. The vehicle according to claim 1, wherein the manual steering device includes a steering wheel.

3. The vehicle according to claim 1, wherein the control system is configured to control the clutch and to cause the clutch to be engaged if the clutch is disengaged and a need for steering support is determined.

4. The vehicle according to claim 3, wherein the control system is configured to control the transmission and to cause a gear to be engaged if the transmission is in a neutral position and a need for steering support is determined.

5. The vehicle according to claim 4, wherein the control system is configured to activate the transmission and the clutch if a need for steering support is determined so that steering-supporting drive torque is generated on the drive axle wheel outside the curve.

6. The vehicle according to claim 5, wherein the control system is configured to activate the engine, the transmission and the clutch in order to support steering so that an absolute value of a drive torque is approximately equal to an absolute value of the braking torque.

7. The vehicle according to claim 1, wherein the vehicle includes one of a front wheel drive, a rear wheel drive and an all-wheel drive.

8. The vehicle according to claim 1, wherein the vehicle includes a front wheel drive.

9. The vehicle according to claim 1, wherein the vehicle includes a rear wheel drive.

10. The vehicle according to claim 1, wherein the vehicle includes an all-wheel drive.

11. The vehicle according to claim 1, wherein the control system is configured to brake the wheel inside the curve of at least one non-driven axle to generate a steering-supporting braking torque thereon.

12. The vehicle according to claim 1, wherein the control system is configured to activate the engine, the transmission and the clutch to support steering so that a variation of a sum of drive torque generated on the drive axle wheels over time is constant.

13. The vehicle according to claim 1, wherein the control system is configured to activate the engine, the transmission and the clutch to support steering so that drive torque is generated in accordance with an extent of operation of the brake system intended to reduce a vehicle speed.

14. The vehicle according to claim 1, wherein the control system is configured to activate the engine, the transmission and the clutch to support steering so that at least one of steering-supporting braking torque and steering-supporting drive torque depends on at least one operating parameter of the vehicle.

15. The vehicle according to claim 14, wherein the at least one operating parameter includes at least one of vehicle velocity, vehicle acceleration, steering angle and direction of travel.

16. The vehicle according to claim 14, wherein the at least one operating parameter includes vehicle velocity.

17. The vehicle according to claim 14, wherein the at least one operating parameter includes vehicle acceleration.

18. The vehicle according to claim 14, wherein the at least one operating parameter includes steering angle.

19. The vehicle according to claim 14, wherein the at least one operating parameter includes direction of travel.

20. The vehicle according to claim 1, wherein the axle differential includes a controllable differential lock, the control system being configured to operate the differential lock to unlock the axle differential to generate steering-supporting drive torque.

21. The vehicle according to claim 1, further comprising an activatable additional drive axle, the control system being configured to activate the additional drive axle, to generate steering-supporting braking torque on the drive axle wheels inside the curve and to generate steering-supporting drive torque on the drive axle wheels outside the curve to achieve steering support.

22. The vehicle according to claim 21, further comprising a center differential configured to distribute rotational speed between a driven front axle and a driven rear axle, the center differential including a differential lock, the control system being configured to operate the differential lock to lock the center differential and generate steering-supporting drive torque.

23. The vehicle according to claim 1, further comprising a traction control device, the control system being integrated into at least one of hardware and software of the traction control device.

24. The vehicle according to claim 23, wherein the traction control device includes at least one of an antilock brake system arrangement, an antispin regulation arrangement and an electronic stability program arrangement.

25. The vehicle according to claim 23, wherein the traction control device includes an antilock brake system arrangement.

26. The vehicle according to claim 23, wherein the traction control device includes an antispin regulation arrangement.

27. The vehicle according to claim 23, wherein the traction control device includes an electronic stability program arrangement.