Estimation of residual electric quantity of EV battery realized by voltage acquisition system based on 89C52RC chip

For EV, residual electric quantity of battery is an important basis for determination of charging and discharging of electro kinetic cell and endurable mileage of the vehicle during driving, but the current electric quantity acquisition is of defects of complicated process and poor accuracy. This work proposes estimation of residual electric quantity of EV realized by voltage requisition system based on 89C52RC chip, which mainly includes: use 89C52RC single chip chip as the core, utilize ADC0804 chip for conversion from analog signal to digital signal, and send the real-time signal acquisition of battery voltage of serial data by MAX232 chip, to realize uniting and adjustment of hardware design and software programming, and finally utilize the scheme and instrument platform in this design, to estimate the residual quantity of EV battery. It´s proved by this work that the system can realize real-time and accurate acquisition of battery voltage, control of acquisition time interval, and real-time monitoring of battery status; and finally accurate estimation of residual quantity of EV battery.