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Bus current limiting control method and device for automotive brushless direct current motor

A brushed DC motor, current-limiting control technology, applied in the direction of excitation or armature current control, etc., to achieve the effect of easy realization, avoidance of damage, convenient promotion and application

Active Publication Date: 2013-02-13
SHANGHAI CHONGSU ENERGY TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a vehicle brushless DC motor bus current limiting control method and device in order to overcome the above defects in the prior art, the method and device can prevent the brushless DC motor system from overheating caused by excessive current At the same time, avoid the battery caused by the excessive discharge current of the power battery, and when the bus current does not exceed the current limit value, it will not affect the driver's operation

Method used

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  • Bus current limiting control method and device for automotive brushless direct current motor
  • Bus current limiting control method and device for automotive brushless direct current motor
  • Bus current limiting control method and device for automotive brushless direct current motor

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Embodiment

[0025] Such as figure 1 As shown, a vehicle brushless DC motor bus current limiting control method includes the following steps:

[0026] 1) The current detection module collects the bus current of the brushless DC motor and sends it to the signal filter module;

[0027] 2) The signal filter module filters the bus current collected by the current detection module and sends it to the main control chip;

[0028] 3) The main control chip judges whether the bus current is greater than the current limit value. If it is, the duty cycle of the driver's input is used as the output duty cycle, and the PWM wave is output to the inverter to drive the brushless DC motor. ; If not, go to step 4);

[0029] 4) The main control chip calculates and obtains the current-limiting duty cycle according to the bus current;

[0030] 5) The main control chip compares the current-limiting duty cycle and the driving will duty cycle, takes the smaller value as the output duty cycle, and modulates the ...

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Abstract

The invention relates to a bus current limiting control method and device for an automotive brushless direct current motor. The method mainly comprises the following steps that: a main control chip receives current signals processed by a conditioning and filtering unit and performs PI compensation control according to a set current limiting value, an allowed maximum duty cycle for avoiding current exceeding the limit value is figured out and is compared with the duty cycle of driving willing, the allowed duty cycle takes a minimum value, and a PWM (Pulse-Width Modulation) control signal corresponding to the minimum duty cycle is output to an inverter driving motor according to the value. The device comprises a current detecting module, a signal filtering module, a main control chip and an inverter which are connected with one another in sequence, wherein the current detecting module and the inverter are all connected with the brushless direct current motor, the current detecting module is used for collecting bus current, and the inverter is used for driving the brushless direct current motor. Compared with the prior art, the method and the device are easy to implement and low in cost, can effectively solve the problem of overheating of the motor, and cannot influencing the driving of a driver under normal conditions.

Description

technical field [0001] The invention relates to a control technology of a brushless DC motor for a vehicle, in particular to a method and device for controlling the current limiting of a bus bar of a brushless DC motor for a vehicle. Background technique [0002] The problem of overheating has been one of the barriers to the application of brushless DC motor systems in vehicles. The brushless DC motor system includes two parts: the motor body and the controller. When the motor body overheats, the phase winding resistance increases, and even the winding burns out; when the controller is overheated, the control board, especially the power switch tube, will be damaged at high temperature damaged and not functioning properly. In short, severe overheating can cause damage to motor system components and prevent them from operating normally. [0003] High current is one of the most direct causes of overheating of the motor system, so the current amplitude of the motor system must...

Claims

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Application Information

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IPC IPC(8): H02P7/06
Inventor 陈凤祥钟继隆周苏章桐
Owner SHANGHAI CHONGSU ENERGY TECH CO LTD
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