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High-speed protection method for electric vehicle resolver fault

A technology for electric vehicles and variable faults, which is applied to electric vehicles, electrical devices, emergency protection circuit devices, etc., can solve problems such as MCU bombing, MCU cannot execute protection measures, and MCU cannot obtain motor speed and position information, etc., to achieve High accuracy, prevent MCU bombing, and simple calculation method

Active Publication Date: 2020-04-03
智新控制系统有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When the resolver of the existing vehicle fails due to disconnection, short circuit, etc., the MCU will not be able to obtain accurate motor speed and position information, so that the MCU will not be able to implement correct protection measures, such as the execution of the three-phase short circuit protection function and There is no basis for stopping, and when the motor is running at high speed, if the protection measures are not appropriate, the MCU will have the risk of blowing up the machine

Method used

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  • High-speed protection method for electric vehicle resolver fault
  • High-speed protection method for electric vehicle resolver fault
  • High-speed protection method for electric vehicle resolver fault

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Such as figure 2 As shown, taking 10 storage units and storing them every 10 milliseconds as an example, calculate the elapsed speed corresponding to the moment when the resolver failure occurs and goes back 50 milliseconds.

[0040] Define a continuous storage unit with a length of 10 array elements (that is, storage unit 0 to storage unit 9), which is used to store the motor speed before the resolver failure is reported. Then, the value of each storage unit is obtained, the specific process: the storage unit 9 is always used to store the motor speed value collected by the current resolver, and the data stored in the current storage unit is transferred to the previous storage unit every 10ms. The data stored in the storage unit 9 is transferred to the storage unit 8, the data stored in the storage unit 8 is transferred to the storage unit 7, the data stored in the storage unit 7 is transferred to the storage unit 6, and so on until the data stored in the storage unit ...

Embodiment 2

[0049] In this embodiment, k is 6, and t 2 Calculate the tracking speed for 100 ms as an example. Its calculation process is as follows:

[0050] 1) The formula for calculating the synchronous speed of the motor is:

[0051]

[0052] In the formula, n represents the speed of the motor in rpm (revolutions per minute); f represents the electrical frequency of the motor in Hz (Hertz); p represents the number of pole pairs of the motor.

[0053] The period T of the motor phase current can be obtained from formula (1), such as formula (2):

[0054]

[0055] In the formula, T represents the period of the phase current of the motor, and the unit is S (second).

[0056] 2) Define a variable Pulse_CNT with an initial value of 0 for counting. This variable counts 6 times every phase current cycle, that is, Pulse_CNT=Pulse_CNT+6; when the counting time of 100 milliseconds is completed, read the total count value Pulse_CNT.

[0057] From this, the following relationship can be ...

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Abstract

The invention relates to the technical field of electric vehicle fault protection, in particular to a high-speed protection method for an electric vehicle resolver fault. The method comprises the steps that motor rotating speed information is stored in real time, when a resolver fault occurs, the historical rotating speed of a t-a time point is calculated through the stored motor rotating speed information, t is the time point when the resolver fault occurs, and a is a set time length; the historical rotating speed is compared with a high rotating speed protection threshold value, and if the historical rotating speed is smaller than the high rotating speed protection threshold value, PWM waves are closed; and if the historical rotating speed is not less than the high rotating speed protection threshold, three-phase short-circuit protection processing is performed. After a resolver fault occurs during high-speed operation of the motor, a motor control system can be effectively and reliably protected, the MCU can accurately estimate the rotating speed of the motor during high-speed operation, and then corresponding protection measures are executed according to the current rotating speed information.

Description

technical field [0001] The invention relates to the technical field of electric vehicle fault protection, in particular to a high-speed protection method for electric vehicle resolver faults. Background technique [0002] Due to its simple structure, small size, high efficiency, high power factor and other advantages, the permanent magnet synchronous motor is widely used in the power system of electric vehicles. In the power system, the motor controller (MCU) is a key component that controls the operation of the permanent magnet synchronous motor. To achieve a high-performance, safe and reliable control system, it is essential to obtain accurate motor speed and position information in real time. As a reliable sensor for detecting motor speed and position information, a resolver (resolver for short) is widely used as a speed measuring device for a permanent magnet synchronous motor of an electric vehicle. [0003] At present, when the MCU detects that the motor reports a res...

Claims

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Application Information

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IPC IPC(8): B60L3/00H02H7/08H02H7/093
CPCB60L3/0061B60L2240/421H02H7/0805H02H7/0833H02H7/093
Inventor 肖江强胡敬伟李建军
Owner 智新控制系统有限公司