Propulsion control using steering angle and vehicle speed to determine tolerance range

• US 4,794,539 A
• Filed: 12/22/1986
• Issued: 12/27/1988
• Est. Priority Date: 12/21/1985
• Status: Expired due to Fees

• Current Assignee: Daimler-Benz AG (Mercedes-Benz Group AG)
• Original Assignee: Daimler-Benz AG (Mercedes-Benz Group AG)
• Inventors: Kuhn, Wolfgang, Laubacher, Karl-Eugen, Neundorf, Siegfried, Wallentowitz, Henning, Buchle, Karl-Heinz
• Primary Examiner(s): Chin, Gary
• Application Number:
  US06/942,692
• Time in Patent Office: 736 Days
• Field of Search: 364/426, 364/431.07, 180/197, 361/238, 303/95, 303/97, 303/100
• US Class Current: 701/70
• CPC Class Codes: B60T 8/1755 Brake regulation specially adapted to control the stability of the vehicle, e.g. taking into account yaw rate or transverse acceleration in a curve road vehicle drive control systems for control of driving stability otherwise than by controlling a particular sub-unit B60W30/02
• CPC Class Codes: B60T 8/48 connecting the brake actuator to an alternative or additional source of fluid pressure , e.g. traction control systems
• CPC Class Codes: B60T 8/58 responsive to speed and another condition or to plural speed conditions

Abstract

A propulsion control system for motor vehicles for maintaining stable driving conditions, having a computer unit for determining a desired value or a tolerance range for the rotational speed difference of the front wheels or of the lateral acceleration or of the yaw velocity, and having a comparator unit in which this desired value or tolerance range is compared with the measured actual value, in which case the difference between the actual value of the desired value or tolerance range is used as a control signal for the brakes of the wheels and/or for a power control element of the vehicle engine.

Claims

1. In a propulsion control system for a motor vehicle for maintaining stable driving conditions, having sensor means for determining the speed of the vehicle wheels, having means for determining the vehicle speed, having means for determining the steering angle and having processing means for producing control signals for the brakes of the wheels and for a power control element of an engine of the vehicle from output signals of the sensor means and the vehicle speed and steering angle determining means the improvement being said processing means which comprises:

computer means for generating, from the steering angle and the vehicle speed, a tolerance range for the difference of the rotational speeds of the front wheels as an output signal,

measuring means for generating, from the rotational speed signals of the front wheels, the actual value of the difference of the rotational speeds of the front wheels as an output signal, and

a comparator means for comparing the output signals of the computer means and the measuring means and generating said control signals.

2. A system according to claim 1, wherein the comparator means generates said control signals proportional to the amount by which the output of the measuring means is outside the tolerance range.

3. A system according to claim 1, including an adaptively operating electronic matching means connected to inputs of said vehicle speed determining means and said computer means for adjusting inputted parameters required for determining the tolerance range in the stable range of the roll steer effect of the vehicle.

4. A system according to claim 1, wherein said computer means generates said tolerance range narrower with increasing vehicle speed and increasing steering angle.

5. In a propulsion control system for a motor vehicle for maintaining stable driving conditions, having means for determining the vehicle speed, having means for determining the steering angle, having means for determining the lateral acceleration and having processing means for producing control signals for the brakes of the wheels and for a power control element of an engine of the vehicle from output signals of the vehicle speed, steering angle and lateral acceleration determining means, the improvement being said processing means which comprises:

a computer means for generating, from the steering angle and the vehicle speed, tolerance range of lateral acceleration as an output signal, and

a comparator means for comparing the output signals of the computer means and of the determining means of the lateral acceleration and generating said control signals.

6. A system according to claim 5, wherein the comparator means generates said control signals proportional to the amount by which the output of the determining means of said lateral acceleration is outside the tolerance range.

7. A system according to claim 5, including an adaptively operating electronic matching means connected to the inputs of said vehicle speed determining means and said computer means for adjusting inputted parameters required for determining the tolerance range in the stable range of the roll steer effect of the vehicle.

8. A system according to claim 5, wherein said computer means varies the tolerance range as a function of the measured lateral acceleration.

9. In a propulsion control system for a motor vehicle for maintaining stable driving conditions, having means for determining the vehicle speed, having means for determining the steering angle, having means for determining the yaw velocity and having processing means for producing control signals for the brakes of the wheels and for a power control element of an engine of the vehicle from output signals of the vehicle speed, steering angle and yaw velocity determining means, the improvement being said processing means which comprises:

a computer means for generating from the steering angle and the vehicle speed, a tolerance range of the yaw velocity as an output signal, and

a comparator means for comparing the output signals of the computer means and the determining means of the yaw velocity and generating said control signals.

10. A system according to claim 9, wherein the comparator means generates said control signals proportional to the amount by which the output of the determining means of the yaw velocity is outside the tolerance range.

11. A system according to claim 9, including an adaptively operating electronic matching means connected to inputs of said vehicle speed determining means and said computer means for adjusting inputted parameters required for determining the tolerance range in the stable range of the roll steer effect of the vehicle.

12. A system according to claim 9, wherein said computer means varies the tolerance range as a function of the measured yaw velocity.