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Hybrid vehicle drive system adapted to prevent concurrent mode change and transmission shifting or torque distribution ratio change

  • US 5,982,045 A
  • Filed: 04/15/1997
  • Issued: 11/09/1999
  • Est. Priority Date: 04/19/1996
  • Status: Expired due to Term
First Claim
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1. A hybrid drive system for a motor vehicle, comprising:

  • a drive power source including an engine operated by combustion of a fuel, and an electric motor operated with an electric energy, at least one of said engine and said electric motor being operated for driving the motor vehicle in a plurality of operation modes;

    an automatic transmission which is disposed between said drive power source and a drive wheel of the motor vehicle and whose speed ratio is variable;

    mode selecting means for selecting one of said plurality of operation modes, according to a predetermined mode selecting pattern;

    shift control means for controlling said automatic transmission to change a speed ratio thereof, according to a predetermined shifting pattern; and

    mode change restricting means for restricting a change of the operation mode of the motor vehicle by said mode selecting means when the speed ratio of said automatic transmission is changed by said shift control means.

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