Electric vehicle signal acquisition circuit

Abstract

The invention discloses an electric vehicle signal acquisition circuit. An RC (Resistance-Capacitance) filter circuit and a hysteresis comparator are adopted; an input signal is output after being filtered twice by RC filtering and the hysteresis comparator. The electric vehicle signal acquisition circuit has no influence on the duty ratio of the input signal while filtering out interference; besides, a fault secure circuit is additionally arranged to ensure the safety of the acquisition circuit.

Description

technical field [0001] The invention relates to a signal acquisition circuit, in particular to an electric vehicle signal acquisition circuit. technical background [0002] Electric vehicles use signal acquisition devices such as sensors and code discs to collect vehicle driving information in real time and send it to the vehicle controller. However, due to the external environment during vehicle driving or the interference signal generated by the vehicle itself, it will be transmitted to the vehicle along with the vehicle information. Vehicle controller, which will cause misjudgment of the controller, affect the performance and efficiency of the motor, and even damage the motor. [0003] The existing method to solve this problem is to add an RC filter at the signal input end, but this method has disadvantages: if the filter capacitor is too small, the interference signal cannot be filtered out, and the filtering effect is not obvious; if the filter capacitor is too large I...

AI Technical Summary

Problems solved by technology

[0002] Electric vehicles use signal acquisition devices such as sensors and code discs to collect vehicle driving information in real time and send it to the vehicle controller. However, due to the external environment during vehicle driving or the interference signal generated by the vehicle itself, it will be transmitted to the vehicle along with the vehicle information. Vehicle controller, which will cause misjudgment of the controller, affect the performance and efficiency of the motor, and even damage the motor

[0003] The existing method to solve this problem is to add an RC filter at the signal input end, but this method has disadvantages: if the filter capacitor is too small, the interference signal cannot be filtered out, and the filtering effect is not obvious; if the filter capacitor is too large If the value is large, the duty cycle of the input signal will be changed while filtering, which will affect the input signal and cause a deviation between the signal sent to the controller and the collected signal.

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