Part-time transfer case with traction control

  • US 5,275,253 A
  • Filed: 03/08/1993
  • Issued: 01/04/1994
  • Est. Priority Date: 07/02/1991
  • Status: Expired due to Term
First Claim
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1. A traction control system for a motor vehicle having an engine and first and second sets of wheels, comprising:

  • power transfer means for transferring drive torque from the engine to the first set of wheels for defining a two-wheel drive mode and which is adapted to permit a vehicle operator to selectively transfer drive torque to the second set of wheels for defining a four-wheel drive mode, said power transfer means having a clutch assembly for transferring drive torque to the second set of wheels when operating in said two-wheel drive mode for defining an on-demand four-wheel drive mode;

    first sensor means for sensing the rotational speed of the first set of wheels and generating a first input signal indicative thereof;

    second sensor means for sensing the rotational speed of the second set of wheels and generating a second input signal indicative thereof; and

    control means for generating an output signal in response to said first and second input signals that is indicative of a speed differential between the first and second sets of wheels, said control means being operable for actuating said clutch assembly so as to vary the magnitude of said drive torque transferred to the second set of wheels in response to the value of said output signal, said control means further operable for de-actuating said clutch assembly in response to said vehicle operator shifting said power transfer means from said two-wheel drive mode into said four-wheel drive mode.

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