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motor control unit

A motor control and motor technology, which is applied in the direction of control system, motor control, current controller, etc., can solve the problems of short flow time and reduced accuracy of current value measurement

Active Publication Date: 2022-04-08
AISIN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since this shunt resistor detects the current from the low-side switching element, it is possible to determine the abnormality of the low-side switching element, but the longer the current flows in the shunt resistor if the duty ratio of the high-side switching element is larger. Short, the measurement accuracy of the current value is reduced

Method used

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Experimental program
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Embodiment approach

[0084] In the embodiment, when it is determined in step #102 that the Duty of any one of Duty (U, V, W) corresponding to U phase, V phase, and W is greater than Duty (Hi), the shift As in the control form of step #103, the control form may be set so as to perform control to eliminate the influence of noise or the like.

[0085] That is, when it is determined that the Duty of any one of Duty (U, V, W) corresponding to U phase, V phase, and W is greater than Duty (Hi), the calculated value CN of the phase (Hi phase) is set to Increment by 1 (CN=CN+1) and compare it with the time value CN(Time). If the calculated value CN is larger than the time value CN(Time), set the control mode to move to the next step of control. .

[0086] By performing such control, for example, due to the influence of noise or the like, it is possible to perform appropriate control without erroneously judging that the Duty of any one of the Duty (U, V, W) phases is greater than the Duty (Hi). In particu...

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Abstract

The present invention relates to motor control devices. Abnormality determination of switching elements and the like can be performed without losing the effectiveness of using the shunt resistor. This motor control device includes a high-side first switching element, a low-side second switching element, a shunt resistor for individually converting a current flowing in each phase into a voltage, and a power control unit. The motor control device further includes a determination unit that turns off the first switching element only for a set time when the duty ratio of the first switching element is equal to or greater than a threshold value, and turns off the first switching element only for a predetermined period corresponding to the set time. By turning on the second switching element of the same phase at a time, the current values ​​flowing through the shunt resistors of all three phases are obtained, and an abnormality determination is performed based on the above sum.

Description

technical field [0001] The present invention relates to a motor control device that controls power supply to each phase of a three-phase brushless motor. Background technique [0002] Patent Document 1 discloses that as a motor control device, an inverter device that controls an AC motor of a plurality of phases includes switching elements on the high side and low side, and three wires that connect the inverter device and the motor generator Two sets of current sensor technologies. [0003] In this Patent Document 1, a failure of a current sensor can be detected by comparing current measurement values ​​performed by a plurality of current sensors, and a current sensor that has failed at the time of failure detection can be identified. [0004] In addition, Patent Document 2 discloses that an inverter for driving a brushless motor includes switching elements on a high side and a low side, and a shunt resistor is provided on a current line through which a current from the swi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P25/022H02P6/08
CPCH02P6/085H02P25/024H02P29/0241H02P6/28H02M7/53871H02P6/14H02P29/024
Inventor 日高靖二杉森一辉
Owner AISIN CORP