Oil pressure control device
First Claim
1. An oil pressure control device for supplying oil pressure by rotating a hydraulic pump, using a motor, comprising:
- an oil pressure sensor operatively placed between the hydraulic pump and a load, and configured to determine an oil pressure;
a motor position determination unit mounted on the motor determines a speed of the motor;
a speed instruction operation unit calculates an oil pressure difference by subtracting an oil pressure determination value determined by the oil pressure sensor from an oil pressure instruction value, and outputs a speed instruction value, based on the oil pressure difference;
a load variation compensation unit outputs a load variation compensation speed for compensating the speed instruction value outputted from the speed instruction operation unit, depending on variation of the oil pressure determination value;
a differentiation unit differentiates a position determination value from the motor position determination unit and outputs a speed determination value;
an addition unit calculates a compensated speed instruction value by adding the speed instruction value from the speed instruction operation unit and the load variation compensation speed from the load variation compensation unit;
a torque instruction value operation unit calculates a speed difference by subtracting the speed determination value from the compensated speed instruction value, and calculates a torque instruction value, based on the speed difference; and
a current control unit controls a current of the motor, based on the torque instruction value;
wherein the load variation compensation unit sets the load variation compensation speed to be larger, when the oil pressure is lower than a predetermined value, than a value to which the load variation compensation speed is set when the oil pressure is higher than another predetermined value.
1 Assignment
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Accused Products
Abstract
An oil pressure control device for supplying oil pressure by rotating a hydraulic pump, by means of a motor, comprises an oil pressure sensor; a speed instruction operation unit for outputting a speed instruction value, based on a difference between an oil pressure determination value from the oil pressure sensor and an oil pressure instruction value; a torque instruction value operation unit for calculating a torque instruction value, based on a difference between a speed determination value and the speed instruction value; and a current control unit for controlling a current of the motor, based on the torque instruction value, and adds the load variation compensation speed outputted from the load variation compensation unit and the speed instruction value.
7 Citations
2 Claims
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1. An oil pressure control device for supplying oil pressure by rotating a hydraulic pump, using a motor, comprising:
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an oil pressure sensor operatively placed between the hydraulic pump and a load, and configured to determine an oil pressure; a motor position determination unit mounted on the motor determines a speed of the motor; a speed instruction operation unit calculates an oil pressure difference by subtracting an oil pressure determination value determined by the oil pressure sensor from an oil pressure instruction value, and outputs a speed instruction value, based on the oil pressure difference; a load variation compensation unit outputs a load variation compensation speed for compensating the speed instruction value outputted from the speed instruction operation unit, depending on variation of the oil pressure determination value; a differentiation unit differentiates a position determination value from the motor position determination unit and outputs a speed determination value; an addition unit calculates a compensated speed instruction value by adding the speed instruction value from the speed instruction operation unit and the load variation compensation speed from the load variation compensation unit; a torque instruction value operation unit calculates a speed difference by subtracting the speed determination value from the compensated speed instruction value, and calculates a torque instruction value, based on the speed difference; and a current control unit controls a current of the motor, based on the torque instruction value; wherein the load variation compensation unit sets the load variation compensation speed to be larger, when the oil pressure is lower than a predetermined value, than a value to which the load variation compensation speed is set when the oil pressure is higher than another predetermined value. - View Dependent Claims (2)
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Specification