Drive-slip control device for motor vehicles

• US 4,982,807 A
• Filed: 09/27/1989
• Issued: 01/08/1991
• Est. Priority Date: 10/03/1988
• Status: Expired due to Fees

• Current Assignee: Daimler Chrysler Company LLC (Stellantis NV)
• Original Assignee: Mercedes-Benz AG (Mercedes-Benz Group AG)
• Inventors: Ochs, Siegfried, Hilburger, Walter
• Primary Examiner(s): Marmor, Charles A.
• Assistant Examiner(s): NOT, DEFINED
• Application Number:
  US07/413,211
• Time in Patent Office: 468 Days
• Field of Search: 180/197, 180/76, 180/275
• US Class Current: 180/197
• 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

Abstract

A Drive-slip control device for motor vehicles in which, when a driven vehicle wheel spins, this wheel is braked and wherein when both driven wheels spin, the engine power is additionally reduced. Spinning of the drive wheels is recognized by means of rotational-speed sensors and an electronic system and when a spin signal is present on account of a differential-speed threshold value between driven and non-driven vehicle axles being exceeded, the power of the engine is reduced in a controlled manner by the electronic system during the duration of the spin signal by means of a final control element. When the spin signal stops, the power of the engine is increased again in a controlled manner to the target value predetermined by the driver by means of the accelerator. However, when power is reduced by the driver during a control operation of the drive-slip control device, below the engine control target value predetermined by the electronic system of the drive-slip control device (during a gear shift) and when power is increased again (when the gear-shift operation is complete) provided this takes place within a predetermined time, only the value which was also present before the reduction of power is permitted again as maximum power.

Claims

1. Drive-slip control apparatus for a motor vehicle having driven and non-driven wheels, and engine and an accelerator, comprising:

Sensor means for measuring separately rotational speed of each of said driven and non-driven wheels;

Spin signal generating means, responsive to output signals from said sensor means, for detecting a difference between the rotational speed of said driven and said non-driven wheels, and for generating a spin signal when said difference exceeds a predetermined threshold value;

Drive-Slip control means for generating an engine control target signal in response to said spin signal;

Engine control means for reducing and increasing power of said engine in a controlled manner in response to said engine control target signal;

Accelerator target control means for generating an accelerator target signal in response to a position of said accelerator pedal;

Memory means for detecting and storing, for a predetermined time interval, an instantaneous value of said engine control target signal, whenever said accelerator target signal equals or falls below said engine control target signal;

Said engine control means being adapted to cause speed of said engine to increase in response to said engine control target signal if said accelerator target signal thereafter increases to a value equal to or exceeding said stored instantaneous value of said engine control target signal within said predetermined time interval, and otherwise to cause the speed of said engine to increase in response to said accelerator target signal.

2. Apparatus according to claim 1, wherein said spin signal generating means is further adapted to detect a difference in the rotational speed as between one of said driven wheels and at least one other of said driven wheels, and to cause application of a breaking force to one of said driven wheels in response thereto.