VEHICULAR STEERING CONTROL APPARATUS
First Claim
1. A steering control apparatus for a vehicle provided with an electric power steering apparatus having a motor capable of applying assist steering torque to a steering shaft, and a drive apparatus capable of driving the motor by supplying driving voltage to the motor, comprising:
- a first control apparatus that controls the drive apparatus such that the driving voltage is supplied at equal to or less than a predetermined upper limit voltage to apply the assist steering torque that is based on a steering amount of a predetermined kind to the steering shaft;
a determining apparatus that determines whether the motor is in a state that corresponds to a power generating state based on the rotation speed of the motor and the supplied driving voltage; and
a second control apparatus that controls the drive apparatus to reduce the amount of power generated by the motor when it is determined that the motor is in the state that corresponds to the power generating state.
1 Assignment
0 Petitions
Accused Products
Abstract
An ECU executes steering control in a vehicle including an electronic control power steering apparatus. In the steering control, it is determined that an assist motor is in a power generating state when a motor rotation speed ω which is the rotation speed of the assist motor is greater than an upper limit rotation speed ω1 set according to a motor command voltage Vq that is the driving voltage of the assist motor. When the assist motor is in the power generating state, the ECU interrupts the supply of current to the assist motor by controlling a relay portion of a drive apparatus that drives the assist motor so that it is open, thereby reducing the amount of power that is generated to zero. Also, when returning to an assist possible state, assist torque Tm is changed gradually with zero as the initial value in order to prevent it from changing suddenly.
22 Citations
14 Claims
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1. A steering control apparatus for a vehicle provided with an electric power steering apparatus having a motor capable of applying assist steering torque to a steering shaft, and a drive apparatus capable of driving the motor by supplying driving voltage to the motor, comprising:
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a first control apparatus that controls the drive apparatus such that the driving voltage is supplied at equal to or less than a predetermined upper limit voltage to apply the assist steering torque that is based on a steering amount of a predetermined kind to the steering shaft; a determining apparatus that determines whether the motor is in a state that corresponds to a power generating state based on the rotation speed of the motor and the supplied driving voltage; and a second control apparatus that controls the drive apparatus to reduce the amount of power generated by the motor when it is determined that the motor is in the state that corresponds to the power generating state. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A steering control method for a vehicle provided with an electric power steering apparatus having a motor capable of applying assist steering torque to a steering shaft, and a drive apparatus capable of driving the motor by supplying driving voltage to the motor, comprising:
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controlling the drive apparatus such that the driving voltage is supplied at equal to or less than a predetermined upper limit voltage to apply the assist steering torque that is based on a steering amount of a predetermined kind to the steering shaft; determining whether the motor is in a state that corresponds to a power generating state based on the rotation speed of the motor and the supplied driving voltage; and controlling the drive apparatus to reduce the amount of power generated by the motor when it is determined that the motor is in the state that corresponds to the power generating state. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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Specification