The Study On Hybrid Vehicle Control Unit Techology

In the face of worldwild shortage of resources as well as environmental pollution,global automotive industry view energy-saving and environment-friendly vehicles asa logical choice. Numerous great research institutes in all countries focus on theHybrid Electric Vehicle (HEV), which have high fuel economy, low emission and lowcost, in the condition of no significant breakthrough of battery technology at present.As one of the key technologies for HEVs, HCU is the core part of HEVs, which isresponsible for the coordination of the other ECUs according to the driver’s operationand the vehicle’s running state to achieve integrated control of the vehicle’s dynamiccharacteristies, fuel economy and emission performance.On the basis of system configuration of the HEV, the design of HCU containshardware design, infra design and supra control strategy development. HCU needs toreceive and process digit signals/analog signals, and produce the specific digitsignals/analog signals, as well as realize stable and reliable CAN communication anddiagnosis&calibration driver. In addition, HCU should be tested and verificatedrationally by halves.Based on V850E/GP8which is32-bits MCU of NEC, the hardware and infra ofHCU used for all kinds of hybrid electric vehicles are designed on this paper. Thefollowing jobs will be accomplished:1. According to functional demand of the hybrid city bus, make out and configurethe control system of hybrid powertrain, and analyze the hardware requirementsof HCU. The requirements include: to wake up the power supply of ECUs of thebus, to sample signals from many sensors, to output some specific signals, toaccomplish CAN communication, and to dispose fault status of HCU.2. The hardware design of HCU based on hardware resource demand of series,paralled and series-paralled hybrid electric vehicles. The hardware system ofHCU includes power supply of ECUs waking-up circuit, power module circuit,basic system circuit of NEC V850E/GP8, relays driving circuit, input signalsprocessing circuit, output signals processing circuit, CAN communicationinterface circuit, and fault status disposal circuit of HCU. 3. The development of the infra of HCU. The infra of HCU is programmed by Clanguage, and contains memory management of NEC V850E/GP8, power onmanagement, signals sampling strategy design, signals output strategy design,CAN communication driver design, diagnosis&calibration driver based on CCPdesign, and the transplant of real-time operation system for embedded system.4. The design of hardware-in-the-loop simulation (HILS) testing system for HCUbased on embedded MCU, C++language and LabVIEW. A real-time system istypicall necessary to provide an accurate simulation. In addition, the field test andanalysis for hardware and software function of HCU will be implemented underthe actual service conditions.