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Vehicle drive force controller

  • US 6,148,257 A
  • Filed: 09/08/1998
  • Issued: 11/14/2000
  • Est. Priority Date: 09/08/1997
  • Status: Expired due to Term
First Claim
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1. A drive force control device for use with a vehicle, said vehicle being provided with an accelerator pedal, an engine comprising a throttle which responds to the accelerator pedal, a drive shaft and a continuously variable transmission which varies a rotation speed of said engine at an arbitrary drive ratio, said transmission having an input shaft joined to said engine and an output shaft joined to said drive shaft, said device comprising:

  • a sensor for detecting a vehicle speed;

    a sensor for detecting a depression degree of the accelerator pedal;

    a sensor for detecting a rotation speed of said input shaft;

    a sensor for detecting a rotation speed of said output shaft; and

    a microprocessor programmed to;

    calculate a required drive shaft drive torque from the vehicle speed and the depression degree of the accelerator pedal,calculate a target input shaft rotation speed to achieve said required drive shaft torque with the least fuel consumption of the engine based on the vehicle speed,control said continuously variable transmission so that the rotation speed of said input shaft is equal to the target input shaft rotation speed,calculate a target engine output torque required to generate said required drive shaft drive torque, andcontrol said throttle so that the output torque of said engine is equal to the target engine output torque.

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