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Parallel hybrid vehicle employing parallel hybrid system, using both internal combustion engine and electric motor generator for propulsion

  • US 6,441,506 B2
  • Filed: 01/23/2001
  • Issued: 08/27/2002
  • Est. Priority Date: 03/07/2000
  • Status: Expired due to Term
First Claim
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1. A parallel hybrid vehicle employing a parallel hybrid system, using both an internal combustion engine and an electric motor generator for propulsion, said parallel hybrid vehicle comprising:

  • a torque composition mechanism which combines a torque output produced by the engine and a torque output produced by the motor generator to generate a combined torque, and which is connected via a transmission in a powertrain to drive wheels to output the combined torque via the transmission to the drive wheels;

    a direct-coupling clutch which directly couples the engine with the motor generator;

    an engine-speed sensor which detects engine speed of the engine;

    a throttle opening sensor which detects a throttle opening of a throttle valve;

    a controller being connected electrically to the motor generator and the direct-coupling clutch for controlling the torque output produced by the motor generator and engagement and disengagement of the direct-coupling clutch, said controller allowing the direct-coupling clutch to operate in a disengaged state and allowing the engine speed to be maintained at a predetermined value during starting of the vehicle;

    said controller comprising;

    (a) a desired motor/generator torque setting section which sets a desired motor/generator torque on the basis of both the engine speed and the throttle opening from a predetermined characteristic map to generate a signal indicative of the desired motor/generator torque, and (b) a response-characteristic compensation section which attenuates high-input-frequency components and passes low-input-frequency components, out of the signal indicative of the desired motor/generator torque set through the desired motor/generator torque setting section, to generate a compensated signal; and

    said controller controlling the torque output of the motor generator on the basis of a signal value of the compensated signal generated by the response-characteristic compensation section.

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