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Hybrid vehicle drive control system

  • US 7,770,678 B2
  • Filed: 11/08/2006
  • Issued: 08/10/2010
  • Est. Priority Date: 11/09/2005
  • Status: Active Grant
First Claim
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1. A hybrid vehicle drive control system comprising:

  • an engine;

    a motor/generator;

    a first clutch arranged between the engine and the motor/generator;

    a transmission including a plurality of gear position clutches arranged between the motor/generator and at least one drive wheel of a hybrid vehicle, with the gear position clutches being selectively engaged to obtain one of a plurality of vehicle running gears; and

    a controller configured to selectively start the engine by using torque transmitted from the first clutch during a mode change from an electric drive mode in which the first clutch is released to a hybrid drive mode in which the first clutch is engaged when an engine start command is issued while the hybrid vehicle is running in the electric drive mode with the motor/generator being used as a power source for driving the drive wheel of the hybrid vehicle,the controller being further configured to select a second clutch that is detected as having a maximum torque transfer capacity from among the gear position clutches that are engaged to constitute one of the vehicle running gears occurring during an engine starting process, and to execute a slip control of the second clutch when the first clutch is being connected to start the engine during the mode change from the electric drive mode to the hybrid drive mode.

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