Drive slip control system

• US 5,164,902 A
• Filed: 01/25/1991
• Issued: 11/17/1992
• Est. Priority Date: 10/08/1986
• Status: Expired due to Term

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Schiele, Werner, Kopper, Werner
• Primary Examiner(s): Chin, Gary
• Application Number:
  US07/662,332
• Time in Patent Office: 662 Days
• Field of Search: 364/426.02, 364/426.03, 180/197, 303/100, 303/102, 303/103, 303/106, 303/95
• US Class Current: 701/76
• CPC Class Codes: B60K 28/16 responsive to, or preventing, skidding of wheels brake control systems for vehicle drive stability B60T8/1755; arrangements responsive to a speed condition for adjusting wheel braking force B60T8/32; control of vehicle driving stability otherwise than by controlling the propulsion unit only B60W30/02; preventing wheel slippage by reducing power in rail vehicles B61C15/00
• CPC Class Codes: B60T 2270/211 Setting or adjusting start-control threshold
• 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
• 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: B60W 2510/0638 Engine speed
• CPC Class Codes: B60W 2710/0644 Engine speed

Abstract

A drive slip control system for a motor vehicle which brakes a driven wheel when that wheel begins to slip and which reduces engine torque when both driven wheels begin to slip on the pavement. The action of the drive slip control system is inhibited when the engine speed falls below a preset speed, such as the engine idle speed.

Claims

1. A drive slip control system for a motor vehicle having two driven wheels and brakes at each of said driven wheels, said control system comprising:

means for determining when at least one of the driven wheels is slipping,

actuator means for applying brake pressure to the brakes at at least one of the driven wheels when slipping is determined,

means for comparing the engine speed with a preset speed, and

means for preventing said actuator means from applying brake pressure at said at least one of said driven wheels when the engine speed falls below the preset speed.

2. The control system defined in claim 1 wherein said preset speed is the engine idle speed.

3. The control system defined in claim 1, further comprising means for reducing engine torque when both of said driven wheels are slipping.