Electronically controlled power steering system for vehicle and method and system for motor control
First Claim
1. A steering device for generating auxiliary steering power by means of an oil pressure generated by a pump that is driven by an electric motor, the electric motor having a conduction angle during which electrical power is provided to at least one motor phase, the steering device comprising:
- a rotary angle detector that detects the rotary angle of the rotor of said electric motor, a steering angular speed sensor for detecting a steering angular speed of a steering operating member, a drive target value setting device that sets a drive target value of said electric motor based on an output of the steering angular speed sensor, a drive signal generator that generates a drive signal for driving said electric motor on the basis of the drive target value which is set by the drive target value setting device, and an angle setting device that sets a phase advance angle of said drive signal with respect to the rotary angle that is detected by said rotary angle detector in relation to the drive target value which is set by said drive target value setting device, thereby varying the conduction angle.
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Accused Products
Abstract
A power steering device capable of obtaining a high rotary speed in the medium low torque range of an electric motor without incurring a drastic increase in manufacturing cost. The power steering device generates an auxiliary steering power by oil pressure that is generated by a pump which is driven by an electric power motor. The electric motor is a triple-phase brushless motor, with its angle of rotation being detected by the Hall sensors. The field coils are provided with the electric current from a drive circuit which is driven by a drive signal from the motor drive control part. The motor drive control part controls the electric motor by PWM control in the low medium speed rotation range and controls the electric motor by phase advance angle control, with PWM duty at 100 percent, in the medium high speed range.
50 Citations
43 Claims
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1. A steering device for generating auxiliary steering power by means of an oil pressure generated by a pump that is driven by an electric motor, the electric motor having a conduction angle during which electrical power is provided to at least one motor phase, the steering device comprising:
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a rotary angle detector that detects the rotary angle of the rotor of said electric motor, a steering angular speed sensor for detecting a steering angular speed of a steering operating member, a drive target value setting device that sets a drive target value of said electric motor based on an output of the steering angular speed sensor, a drive signal generator that generates a drive signal for driving said electric motor on the basis of the drive target value which is set by the drive target value setting device, and an angle setting device that sets a phase advance angle of said drive signal with respect to the rotary angle that is detected by said rotary angle detector in relation to the drive target value which is set by said drive target value setting device, thereby varying the conduction angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for generating auxiliary steering power by means of an oil pressure generated by a pump that is driven by an electric motor, the electric motor having a conduction angle during which electrical power is provided to at least one motor phase, the method comprising:
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detecting the rotary angle of the rotor of said electric motor, detecting a steering angular speed of a steering operating member, setting a drive target value of said electric motor based on the steering angular speed, generating a drive signal for driving said electric motor on the basis of the drive target value, and setting a phase advance angle of said drive signal with respect to the rotary angle in relation to the drive target value, thereby varying the conduction angle. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A method for controlling an electric motor, the motor having at least one sensor output for determining a switching instant for a switch of a switching converter controlling a conduction angle determining a conduction time during a revolution of the motor, the method comprising:
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receiving the sensor output;
advancing a switching-on time of a switch of the switching inverter connecting a d-c bus voltage to a motor phase drive input by a phase angle prior to the next sensor output determining the switching instant; and
controlling the speed of the motor by changing the amount of the phase angle. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30)
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31. A motor speed control regulator comprising:
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a switching inverter selectively switching a dc bus voltage for powering the motor;
a controller for controlling a switching operation of the inverter, an on-time of each switch of the inverter determining the conduction angle, the controller having at least one input from at least one sensor providing a sensor signal related to a rotational position of the rotor of the motor;
the controller changing the phase angle at which each switch of the inverter switches on in response to the sensor signal such that each switch switches on at a phase angle in advance of the sensor signal, the amount of the phase angle advance controlling the motor speed. - View Dependent Claims (32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43)
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Specification