Design Of Control System For HEV Power Battery Performance Testing Platform

Due to the environmental pollution and stress of oil resource shortage, for the implementation of sustainable development strategies, hybrid electric vehicle (HEV) has become a development direction of the automobile industry of 21st century. The driving conditions of hybrid electric vehicle are very complicated, which have great influence on the life of batteries, therefore, the key problem to put hybrid electric vehicles into practical use is to solve the problem of battery, while the power battery testing equipments of hybrid electric vehicle are also asked for more strict requirements. The charging and discharging technology of battery is concomitant with battery and is closely related with the rapid development of batteries. Based on the characteristics of nickel hydrogen battery, this paper describes the design of the control system of HEV power battery testing platform.The performance requirements of the mixed power automotive power battery are introduced, taking nickel hydrogen battery as studying object, analysing the working principle and charging and discharging characteristics, which provide basis for charging and discharging control program that suitable for HEV nickel hydrogen battery.Analysing the two circuit structure and working principle of Buck and Boost, designing Buck-Boost composite dc dc converter circuit that fit for this test system, which are benefit for the realization of battery dischargeing energy reuse. For the implementation of the dc dc converter converter of the charging and discharging current control, the hardware and software design and debugging work of the D/A output, digital PID regulator, PWM output etc. are completed.Communication designs between each level of the system are introduced: SCI communication is adopted between the main host computer and the DSP controller; Between the main controller and subordinate controller, CAN bus communication is used. Using virtual instrument technology, designing battery charging and discharging programming table interface through the LabVIEW software, the system has control commands of saving and loading functions. The anti-jamming measures that used for hardware and software in practical application are put forward, which ensures that control system is able to work stably and reliably in inclement electromagnetic interference environment.