Electric automobile, and operation signal sampling method and AD conversion system thereof

Abstract

The invention discloses an operation signal sampling method of an electric automobile. The method comprises the steps that a sampling system for sampling operation signals of electric automobile is verified to obtain a sampling mathematic model of the sampling system; the sampling system obtains analog operation signals of the electric mobile and corrects the analog operation signals according to the sampling mathematic model; and the corrected analog operation signals are converted to digital operation signals. According to the operation signal sampling method, system errors of an AD sampling circuit of the electric automobile can be reduced, the operation signal sampling precision is improved, the electric automobile can be controlled more accurately, and the reliability of the electric automobile is improved. The invention also discloses an AD conversion system of the electric automobile as well as the electric automobile with the AD conversion system.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a sampling method of an operating signal of an electric vehicle, an AD conversion system of the electric vehicle, and an electric vehicle with the AD conversion system. Background technique [0002] During the operation of electric vehicles, it is necessary to collect analog signals such as bus voltage, phase line current, and accelerator brake of electric vehicles for processing. The accuracy of the collected data directly affects the control accuracy and judgment of the control chip. However, the ADC of electric vehicles ( Analog-to-Digital Converter (analog / digital conversion) sampling system has systematic errors, and sometimes even causes misjudgment by the control chip. For example, if the bus voltage value collected is higher than the actual voltage value, the circuit protection circuit may be triggered in advance, such as causing Malfunction of over-voltage protection...

AI Technical Summary

Problems solved by technology

However, the sampling accuracy of the control chip ECU can reach up to 5%, and there is no room for improvement.

It can be seen that in the prior art, the improvement is mainly the accuracy of the peripheral channel, and even an accuracy rate of one-thousandth can be achieved. However, if the 5% sampling accuracy (ie, linear distortion) of the control chip ECU itself is considered, The accuracy rate of the whole system will be reduced, and the sampling accuracy of the control chip ECU itself depends on the semiconductor material and its processing technology, which is uncontrollable, so it is easy to trigger misoperation, cause the vehicle to stop abnormally, and reduce the safety of electric vehicles. Performance

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