Vehicle control device and vehicle control method
First Claim
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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Accused Products
Abstract
A control device for a vehicle includes: a charge control portion that adjusts an upper limit of charging power to a battery to prevent a negative electrode potential of the battery from dropping to a lithium reference potential, based on a charge/discharge history of the battery; a braking control portion that detects a sharing ratio between hydraulic braking force by a braking device and regenerative braking force for desired braking force according to a brake pedal depression amount so that a motor generator generates a regenerative braking force within a range of the adjusted upper limit of charging power; and a setting portion that variably sets, according to the hydraulic response rate detected by the detection portion, a degree of limitation of the upper limit when restricting charging current to the battery by restricting the upper limit.
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Citations
7 Claims
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1. A control device for a vehicle having:
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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. - View Dependent Claims (2, 3, 4, 6)
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5. A control method for a vehicle having:
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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 method comprising; adjusting 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; determining 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; calculating 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, and the delay time amount is a period of time required for the actual hydraulic pressure to reach the target hydraulic pressure; and variably setting, according to the detected hydraulic response rate, 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. - View Dependent Claims (7)
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Specification