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Torque control map to initiate engine startup processing in a hybrid vehicle

  • US 8,649,924 B2
  • Filed: 11/26/2008
  • Issued: 02/11/2014
  • Est. Priority Date: 11/30/2007
  • Status: Active Grant
First Claim
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1. A hybrid system control method,the hybrid system comprisingan internal combustion engine,variable speed means for varying and outputting a rotational velocity of the internal combustion engine,electric means for electrically driving drive wheels,a battery for the electric means, andcontrol means that has a map for deciding target torques of the internal combustion engine and the electric means and is for command-controlling the internal combustion engine and the electric means on the basis of the map,and in the map, there are defined a maximum torque line that demarcates an upper limit torque that the electric means is capable of supplying as a function of at least a vehicle velocity and a battery state-of-charge and a margin torque line that is a predetermined margin lower than the maximum torque line,the control method comprising the steps of:

  • detecting an accelerator stroke position, the vehicle velocity and the battery state-of-charge;

    performing electric travel by the electric means when the position on the map determined by the detected accelerator stroke position, vehicle velocity and battery state-of-charge is in a torque position below the margin torque line;

    initiating startup processing of the engine in order to transition to hybrid travel when the position on the map becomes a torque position on or above the margin torque line; and

    setting the target torque of the engine and the target torque of the electric means and command-controlling the engine and the electric means in order to achieve a torque corresponding to the detected accelerator stroke position when the position on the map becomes a torque position exceeding the maximum torque line.

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