Steering controlling device
First Claim
1. A steering controlling device comprising:
- a power source;
a motor connected to a steering system;
a motor driving circuit converting a power source voltage to a predetermined voltage and applying the converted voltage to the motor;
a means for controlling the motor driving circuit, wherein the controlling means controls the motor driving circuit to boost the power source voltage when a rotational speed of the motor is greater than a predetermined value;
wherein the motor driving circuit includes at least a first converter connected to the power source and a bridge circuit connected to the motor; and
a second converter boosting an output voltage from the first converter in order to drive switching elements, forming the bridge circuit.
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Abstract
A steering controlling device comprising a power source, a motor connected to a steering system, a motor driving circuit converting a power source voltage to a predetermined voltage and applying the voltage to the motor, and a controlling means for controlling the motor driving circuit, wherein the controlling means controls the motor driving circuit so as to boost the power source voltage when a rotational speed of the motor is a predetermined value or more, whereby a sufficient motor output torque is obtainable under various steering conditions in use of a converter, an efficiency is improved by suppressing a frequency of operating the converter, and an appropriate fail safe treatment is conducted when the converter is disordered.
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Citations
12 Claims
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1. A steering controlling device comprising:
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a power source; a motor connected to a steering system; a motor driving circuit converting a power source voltage to a predetermined voltage and applying the converted voltage to the motor; a means for controlling the motor driving circuit, wherein the controlling means controls the motor driving circuit to boost the power source voltage when a rotational speed of the motor is greater than a predetermined value;
wherein the motor driving circuit includes at least a first converter connected to the power source and a bridge circuit connected to the motor; anda second converter boosting an output voltage from the first converter in order to drive switching elements, forming the bridge circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification