Motor-driven power steering apparatus
First Claim
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1. A motor driven power steering apparatus for a vehicle which depends on a D.C. power source as an energy source for electrical devices mounted on the vehicle, and which produces an auxiliary steering force in response to the torque applied to the steering column of the vehicle, comprising:
- means for supplying a first D.C. voltage at a first voltage level;
means for supplying a second D.C. voltage at a second voltage level which is lower than said first voltage level; and
actuator means for generating an auxiliary steering force for the vehicle, including a motor for supplying the auxiliary steering force and current control means for controlling current supplied to said motor to control said auxiliary steering force;
said current control means including a chopper device connected to said motor and said first D.C. voltage supplying means for controlling the current supplied to said motor and a chopper controller connected to said second D.C. voltage supplying means for controlling said chopper device in accordance with torque applied to the steering column of the vehicle.
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Abstract
A generator generates two voltage outputs which have different voltage levels. One voltage output from the generator is used for operating a power steering apparatus. Another voltage output from the generator is used for charging a battery which supplies current to other loads.
22 Citations
8 Claims
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1. A motor driven power steering apparatus for a vehicle which depends on a D.C. power source as an energy source for electrical devices mounted on the vehicle, and which produces an auxiliary steering force in response to the torque applied to the steering column of the vehicle, comprising:
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means for supplying a first D.C. voltage at a first voltage level; means for supplying a second D.C. voltage at a second voltage level which is lower than said first voltage level; and actuator means for generating an auxiliary steering force for the vehicle, including a motor for supplying the auxiliary steering force and current control means for controlling current supplied to said motor to control said auxiliary steering force; said current control means including a chopper device connected to said motor and said first D.C. voltage supplying means for controlling the current supplied to said motor and a chopper controller connected to said second D.C. voltage supplying means for controlling said chopper device in accordance with torque applied to the steering column of the vehicle. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A motor driven power steering apparatus for a vehicle which depends on a D.C. power source as an energy source for electrical devices mounted on the vehicle, comprising:
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a battery connected to supply a first voltage at a first level to said electrical devices of the vehicle; a power source supplying a second voltage at a second level which is substantially higher than said first level; and actuator means for generating an auxiliary steering force for the vehicle, including a brushless motor for supplying the auxiliary steering force and current control means connected to said brushless motor for controlling current supplied to said brushless motor to control said auxiliary steering force; said current control means including an inverter connected to said power source and to said brushless motor for supplying current to said brushless motor. - View Dependent Claims (8)
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Specification