POWER STEERING DEVICE
First Claim
Patent Images
1. A power steering apparatus comprising:
- a steering mechanism formed of an iron-series metallic material and which steers steerable wheels in accordance with a steering operation of a steering wheel;
an electrically driven motor which provides a steering force for the steering mechanism;
a speed reduction mechanism formed of the iron-series metallic material, interposed between the steering mechanism and the electrically driven motor, and which transmits a revolution force of the electrically driven motor to the steering mechanism;
a torque sensor which detects a steering torque generated in the steering mechanism;
a control unit which calculates a motor command current drivingly controlling the electrically driven motor on a basis of the steering torque and outputs the motor command current to the electrically driven motor;
a steering load average value calculating circuit installed in the control unit and which calculates an average value of a steering load corresponding value which corresponds to any one of the steering torque within a predetermined interval of time, the motor command current, and a motor actual current actually flowing through the electrically driven motor; and
an abnormality detection circuit installed in the control unit, which compares the average value of the steering load corresponding value with a specified value stored in the control unit, and detects an abnormality of the apparatus when the average value is larger than the specified value.
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Abstract
A power steering apparatus includes: a steering load average value calculating circuit 39 which calculates a steering torque average value Trav which is the average value of steering torque Tr within a predetermined interval of time; and an abnormality detection circuit 40 which compares steering torque average value Trav with a specified steering torque value Trrf and detects the abnormality of the apparatus when steering torque average value Trav is larger than the specified value.
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Citations
20 Claims
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1. A power steering apparatus comprising:
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a steering mechanism formed of an iron-series metallic material and which steers steerable wheels in accordance with a steering operation of a steering wheel; an electrically driven motor which provides a steering force for the steering mechanism; a speed reduction mechanism formed of the iron-series metallic material, interposed between the steering mechanism and the electrically driven motor, and which transmits a revolution force of the electrically driven motor to the steering mechanism; a torque sensor which detects a steering torque generated in the steering mechanism; a control unit which calculates a motor command current drivingly controlling the electrically driven motor on a basis of the steering torque and outputs the motor command current to the electrically driven motor; a steering load average value calculating circuit installed in the control unit and which calculates an average value of a steering load corresponding value which corresponds to any one of the steering torque within a predetermined interval of time, the motor command current, and a motor actual current actually flowing through the electrically driven motor; and an abnormality detection circuit installed in the control unit, which compares the average value of the steering load corresponding value with a specified value stored in the control unit, and detects an abnormality of the apparatus when the average value is larger than the specified value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A power steering apparatus comprising:
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a steering mechanism formed of an iron-series metallic material and which steers steerable wheels in accordance with a steering operation of a steering wheel; an electrically driven motor which provides a steering force for the steering mechanism; a speed reduction mechanism formed of the iron-series metallic material, interposed between the steering mechanism and the electrically driven motor, and which transmits a revolution force of the electrically driven motor to the steering mechanism; a torque sensor which detects a steering torque generated in the steering mechanism; a control unit which calculates a motor command current drivingly controlling the electrically driven motor on a basis of the steering torque and outputs the motor command current to the electrically driven motor; and an abnormality detection circuit, installed in the control unit, which compares a steering load corresponding value which corresponds to any one of the steering torque within a predetermined interval of time, the motor command current, and a motor actual current actually flowing through the electrically driven motor with a specified value stored in the control unit, and which detects an abnormality of the apparatus when a frequency that the steering load corresponding value exceeds the specified value is larger than a predetermined value. - View Dependent Claims (16, 17, 18, 19)
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20. A power steering apparatus comprising:
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a steering mechanism formed of an iron-series metallic material and which steers steerable wheels in accordance with a steering operation of a steering wheel; an electrically driven motor which provides a steering force for the steering mechanism; a speed reduction mechanism interposed between the steering mechanism and the electrically driven motor and which transmits a revolution force of the electrically driven motor to the steering mechanism; a torque sensor which detects a steering torque generated in the steering mechanism; a control unit which calculates a motor command current drivingly controlling the electrically driven motor on a basis of the steering torque and outputs the motor command current to the electrically driven motor; a steering load average value calculating circuit installed in the control unit and which calculates an average value of a steering load corresponding value which is any one of the steering torque within a predetermined interval of time, the motor command current, and a motor actual current actually flowing through the electrically driven motor; and an abnormality detection circuit installed in the control unit, which compares the average value of the steering load corresponding value with a specified value stored in the control unit, and which detects an abnormality of the apparatus when the average value is larger than the specified value.
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Specification