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Vehicle control device and vehicle control method

  • US 8,521,350 B2
  • Filed: 03/01/2012
  • Issued: 08/27/2013
  • Est. Priority Date: 03/02/2011
  • Status: Active Grant
First Claim
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1. A control device for a vehicle having:

  • a battery formed of a lithium ion secondary battery;

    a braking device configured to exert braking force on a drive wheel according to hydraulic pressure supplied from a hydraulic pressure generation circuit;

    a motor generator configured to transmit rotation force reciprocally with the drive wheel; and

    a power controller that performs bidirectional power conversion between the battery and the motor generator to control output torque of the motor generator,the control device comprising;

    a charge control portion that adjusts an upper limit of charging power to the battery so as to prevent a negative electrode potential of the battery caused by lithium metal deposits on the negative electrode of the battery causing the battery to drop to a lithium reference potential, based on a charge and discharge history of the battery;

    a braking control portion that determines a sharing ratio between a hydraulic braking force by the braking device and a regenerative braking force for desired braking force according to a brake pedal depression amount so that the motor generator generates the regenerative braking force within a range of the adjusted upper limit of charging power;

    a detection portion that calculates an actual value of a hydraulic response rate in the hydraulic pressure generation circuit by dividing a hydraulic pressure variation amount by a delay time amount, the hydraulic pressure variation amount is a difference between a target hydraulic pressure and an actual hydraulic pressure supplied from the hydraulic pressure generation circuit to a brake caliper of the braking device, and the delay time amount is a period of time required for the actual hydraulic pressure to reach the target hydraulic pressure; and

    a setting portion that variably sets, according to the hydraulic response rate calculated by the detection portion, a degree of limitation of the upper limit of charging power when restricting charging current to the battery by restricting the upper limit of charging power.

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