Current sensor auxiliary device having SOC (system on chip) computing function

Abstract

The invention relates to a current sensor auxiliary device having an SOC (system on chip) computing function. The current sensor auxiliary device comprises a current sensor, a power supply module, an AD collecting circuit, a microprocessor, a CAN (controller area network) controller, a CAN receiver-transmitter and a jack, wherein, a signal end of the current sensor is connected with the AD collecting circuit, a signal output end of the AD collecting circuit is connected with the microprocessor, and the microprocessor is connected with the CAN receiver-transmitter. The current sensor auxiliary device is connected onto a CAN bus of a BMS (battery management system) main board and communicated in a CAN bus manner, so the current sensor auxiliary device has the characteristics of high transmission speed and strong interference resistance; the SOC value is calculated by utilizing the collected current through an ampere-hour integral method, and the SOC computing is realized through a high-speed and high-precision manner; and all parts are integrated, so that the zero-distance collection of a current signal can be realized, and the influence of the electromagnetic interference of a finished automobile on a current collection wire can be prevented and reduced.

Description

technical field [0001] The invention belongs to the technical field of BMS (battery management system), and in particular relates to SOC (state of charge, state of charge) calculation and diagnosis application technology. Background technique [0002] With the needs and advancement of the environment, society and the government, new energy vehicles will become the trend and key direction of the future development of the automotive industry. The battery has always been the bottleneck in the development of new energy vehicles. Various parameters of the battery (capacity, internal resistance, charge and discharge efficiency, SOC, etc.) determine important functions such as the continuous driving process of the vehicle, battery life, and torque management. Among them, SOC is an important parameter in the control of new energy vehicles, and its calculation accuracy will directly affect the accuracy of vehicle torque management and the effectiveness of charging and discharging mod...

AI Technical Summary

Problems solved by technology

At present, when many battery management systems (BMS) calculate the SOC, the IO of the BMS motherboard is directly connected to the current sensor (Hall type or shunt) through the wire to collect the current, and then the SOC calculation is performed in the BMS motherboard chip. There is a high voltage and motor environment, and the electromagnetic interference is relatively large. At the same time, there are several wires between the current sensor and the BMS main board, which usually cause the current collected by the BMS main board to jump or drift, so that the SOC calculation value is affected.

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