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System for controlling downshift points of automatically selectable transmission gears

  • US 6,003,396 A
  • Filed: 04/20/1998
  • Issued: 12/21/1999
  • Est. Priority Date: 04/20/1998
  • Status: Expired due to Term
First Claim
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1. A system for controlling downshifting of an automatically selectable gear of a transmission coupled to an internal combustion engine of a vehicle, comprising:

  • means for determining one of engine and vehicle deceleration;

    means for determining one of a commanded throttle percentage and engine load;

    means for determining a downshift engine RPM of an automatically selectable gear of a transmission coupled to an internal combustion engine based on a comparison of a rate of said one of engine and vehicle deceleration with at least one predefined deceleration rate and on said one of commanded throttle percentage and engine load; and

    means for controlling downshifting of said automatically selectable gear of said transmission based on said downshift engine RPM.

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