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Propulsion control using lateral acceleration and propulsion control signals to select slip thresholds

  • US 4,933,856 A
  • Filed: 12/17/1986
  • Issued: 06/12/1990
  • Est. Priority Date: 12/21/1985
  • Status: Expired due to Fees
First Claim
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1. In a propulsion control system for a motor vehicle for preventing an undesireable spinning of the driven vehicle wheels, having a plurality of sensor means for providing signals indicative of the speed of the vehicle wheels, having slip means for determining the slip of the driven vehicle wheels from the signals of said sensor means, having a first slip comparator means for each driven vehicle wheel for comparing the driven wheel speed to an indicated threshold value and providing an output signal when the threshold is exceeded, having means for actuating a control element to reduce the output torque of an engine of the vehicle in response to an input signal indicative of at least one of the driven wheels of the vehicle tend to spin, having a vehicle speed comparator means for comparing vehicle speed to a second indicated threshold value and providing an output signal when the second threshold is exceeded, having a means for measuring the lateral acceleration of the vehicle, a first lateral acceleration comparator means for comparing said lateral acceleration to a third indicated threshold value and providing an output signal when the third threshold is exceeded, the improvement comprising:

  • at least a second lateral acceleration comparator means for comparing said lateral acceleration to a first indicated additional threshold value and providing an output signal when the first additional threshold is exceeded,for each driven vehicle wheel, at least one additional slip comparator means for comparing said driven wheel speed to a second additional indicated threshold value and providing an output signal when the second additional threshold is exceeded, andlogic means for enabling at least said additional slip comparator means instead of the first slip comparator in response to a predetermined combination of said output signal of the vehicle speed comparator means, said output signal from said lateral acceleration comparator means and said input signal to the actuating means for the control element affecting the engine output torque.

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