MOTOR CONTROL METHOD FOR ELECTRIC-POWERED VEHICLE AND DRIVING APPARATUS FOR ELECTRIC-POWERED VEHICLE
First Claim
1. A motor control method for an electric-powered vehicle, which is designed to switch an output characteristic of an electric motor for rotatably driving a driving wheel of the vehicle, between a low-speed mode adaptable to a relatively low rotation speed operation region and a high-speed mode adaptable to a relatively high rotation speed operation region, on the basis of a given switching rotation speed as a threshold, the motor control method comprising:
- a vehicle-turning information acquisition step of acquiring information about a turning movement of the vehicle;
a vehicle-turning determination step of determining whether the vehicle is in a non-straight-ahead traveling state, based on the information acquired in the vehicle-turning information acquisition step; and
a shift step of, if the determination in the vehicle-turning determination step is made that the vehicle is in the non-straight-ahead traveling state, shifting the switching rotation speed to a value different from that in a straight-ahead traveling state of the vehicle.
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Abstract
Disclosed is a motor control method for an electric-powered vehicle (1), which is designed to switch an output characteristic of an electric motor (5) for rotatably driving a driving wheel (16) of the vehicle (1), between a low-speed mode adaptable to a relatively low rotation speed operation region and a high-speed mode adaptable to a relatively high rotation speed operation region, on the basis of a given switching rotation speed (Nt) as a threshold. The motor control method comprises a vehicle-turning information acquisition step (S1, S2) of acquiring information about a turning movement of the vehicle (1), a vehicle-turning determination step (S5, S9, S14, S18) of determining whether the vehicle (1) is in a non-straight-ahead traveling state, based on the information acquired in the vehicle-turning information acquisition step, and a shift step (S6, S10, S15, S19) of, if the determination in the vehicle-turning determination step is made that the vehicle is in the non-straight-ahead traveling state, shifting the switching rotation speed (Nt) to a value different from that in a straight-ahead traveling state of the vehicle. The motor control method of the present invention can prevent a behavior of the vehicle (1) from becoming unstable when the output characteristic of the electric motor (5) for rotatably driving the driving wheel (16) is switched between the low-speed mode and the high-speed mode.
17 Citations
14 Claims
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1. A motor control method for an electric-powered vehicle, which is designed to switch an output characteristic of an electric motor for rotatably driving a driving wheel of the vehicle, between a low-speed mode adaptable to a relatively low rotation speed operation region and a high-speed mode adaptable to a relatively high rotation speed operation region, on the basis of a given switching rotation speed as a threshold, the motor control method comprising:
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a vehicle-turning information acquisition step of acquiring information about a turning movement of the vehicle; a vehicle-turning determination step of determining whether the vehicle is in a non-straight-ahead traveling state, based on the information acquired in the vehicle-turning information acquisition step; and a shift step of, if the determination in the vehicle-turning determination step is made that the vehicle is in the non-straight-ahead traveling state, shifting the switching rotation speed to a value different from that in a straight-ahead traveling state of the vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A driving apparatus for an electric-powered vehicle, comprising an electric motor adapted to rotatably drive a driving wheel of the vehicle, and a controller adapted to switch an output characteristic of the electric motor between a low-speed mode adaptable to a relatively low rotation speed operation region and a high-speed mode adaptable to a relatively high rotation speed operation region, on the basis of a given switching rotation speed as a threshold, wherein:
the controller is operable to acquire information about a turning movement of the vehicle, and, based on the acquired information, determine whether the vehicle is in a non-straight-ahead traveling state, and wherein, if the determination is made that the vehicle is in the non-straight-ahead traveling state, the controller is operable to shift the switching rotation speed to a value different from that in a straight-ahead traveling state of the vehicle. - View Dependent Claims (9, 10, 11, 12, 13, 14)
Specification