DRIVING FORCE CONTROL DEVICE FOR ELECTRIC VEHICLE
First Claim
1. A driving force control device for an electric vehicle having a plurality of motors, which independently drive a plurality of wheels, and a plurality of inverters, which control a drive current for each of the motors in accordance with a driving force command value, the driving force control device comprising:
- target driving force calculation means that calculates a target driving force for each of the motors in accordance with a vehicle operation performed by an operator of the vehicle or with the running status of the vehicle;
determination means that determines whether each of the motors can be operated within a desired operating range when each of the motors is driven by the target driving force;
driving force command value calculation means which, if the determination means determines that each of the motors cannot be operated within the desired operating range, adjusts the distribution of driving force for each of the motors in accordance with the target driving force for each of the motors and with the operating status of each of the motors and calculates an actual driving force command value for each of the motors for the purpose of operating each of the motors within the desired operating range; and
command value output means that outputs the driving force command value to each of the inverters.
1 Assignment
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Accused Products
Abstract
Disclosed is a driving force control device that includes a determination section (12), a driving force command value calculation section (13), and a command value output section (14). The determination section (12) determines whether each of a plurality of motors (106), which independently drive a plurality of wheels (107), can be operated within a desired operating range when driven by a target driving force calculated for each of the motors (106). The driving force command value calculation section (13) adjusts the distribution of driving force for each of the motors in accordance with the target driving force for each of the motors and with the operating status of each of the motors and calculates an actual driving force command value for each of the motors for the purpose of operating each of the motors within the desired operating range if the determination means determines that each of the motors cannot be operated within the desired operating range. The command value output section (14) outputs the driving force command value to each of a plurality of inverters (105). Therefore, a target vehicle motion can be maximally realized while appropriately maintaining the drive status of each of the motors.
20 Citations
7 Claims
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1. A driving force control device for an electric vehicle having a plurality of motors, which independently drive a plurality of wheels, and a plurality of inverters, which control a drive current for each of the motors in accordance with a driving force command value, the driving force control device comprising:
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target driving force calculation means that calculates a target driving force for each of the motors in accordance with a vehicle operation performed by an operator of the vehicle or with the running status of the vehicle; determination means that determines whether each of the motors can be operated within a desired operating range when each of the motors is driven by the target driving force; driving force command value calculation means which, if the determination means determines that each of the motors cannot be operated within the desired operating range, adjusts the distribution of driving force for each of the motors in accordance with the target driving force for each of the motors and with the operating status of each of the motors and calculates an actual driving force command value for each of the motors for the purpose of operating each of the motors within the desired operating range; and command value output means that outputs the driving force command value to each of the inverters.
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2. A driving force control device for an electric vehicle having a plurality of motors, which independently drive a plurality of wheels, and a plurality of inverters, which control a drive current for each of the motors in accordance with a driving force command value, the driving force control device comprising:
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target driving force calculation means that calculates a target driving force for each of the motors in accordance with a vehicle operation performed by an operator of the vehicle or with the running status of the vehicle; determination means that determines whether the motors engaged in power running and in regeneration coexist when each of the motors is driven by the target driving force; driving force command value calculation means which, if the determination means determines that the motors engaged in power running and in regeneration coexist, adjusts the distribution of driving force for each of the motors in accordance with the target driving force for each of the motors so that all the motors are engaged in either power running or regeneration, and calculates an actual driving force command value for each of the motors; and command value output means that outputs the driving force command value to each of the inverters. - View Dependent Claims (3, 4, 5)
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6. A driving force control device for an electric vehicle having a plurality of motors, which independently drive a plurality of wheels, a plurality of inverters, which control a drive current for each of the motors in accordance with a driving force command value, and a plurality of braking devices, which independently apply a braking torque to each of the wheels, the driving force control device comprising:
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target driving force calculation means that calculates a target driving force for each of the motors in accordance with a vehicle operation performed by an operator of the vehicle or with the running status of the vehicle; determination means that determines whether the motors engaged in power running and in regeneration coexist when each of the motors is driven by the target driving force; driving force command value calculation means which, if the determination means determines that the motors engaged in power running and in regeneration coexist, calculates the driving force command value for a motor engaged in power running in accordance with the target driving force for the motor engaged in power running, calculates the driving force command value for a motor engaged in regeneration by changing the target driving force for the motor engaged in regeneration to zero, and calculates driving force command values for the braking devices in order to permit the braking devices to generate a braking torque equivalent to the target driving force for the motor engaged in regeneration; and command value output means that outputs the driving force command value to each of the inverters and outputting the driving force command value to each of the braking devices.
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7. A driving force control device for an electric vehicle having a plurality of motors, which independently drive a plurality of wheels, and a plurality of inverters, which control a drive current for each of the motors in accordance with a driving force command value, the driving force control device comprising:
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target driving force calculation means that calculates a target driving force for each of the motors in accordance with a vehicle operation performed by an operator of the vehicle or with the running status of the vehicle; driving force command value calculation means that calculates an actual driving force command value for each of the motors in accordance with the target driving force for each of the motors; command value output means that outputes the driving force command value to each of the inverters; determination means that determines whether the motors engaged in power running and in regeneration coexist when each of the motors is driven by the target driving force; voltage calculation means which, if the determination means determines that the motors engaged in power running and in regeneration coexist, detects the difference between a voltage supplied to a motor engaged in power running and a voltage generated by a motor engaged in regeneration, and calculates a voltage required for compensating for the voltage difference; and voltage regulation means which is disposed on each of power supply lines connecting the inverters to the electrical power supply means and to the electrical power recovery means and used to generate the voltage calculated by the voltage calculation means.
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Specification