Multi-energy Powertrain Control System Research And Design

Hybrid electric vehicles (HEV), employing different energy convert devises, have incomparable advantages of traditional internal combustion vehicles in feul economy and emission. The core and base of development of HEVs is multi-energy powertrain control system (HCU).The thesis, which is supported by the HEVs sub-project of the 863 Program of China, researches the requisition analysis of HCU and hardware design plan and software design plan systemically. The author completed hardware and software design and debug and conformed the feasibility of HCU design plan through lots of experiment. In the end, author gives some hardware and software measures of HCU reliability design against HCU application environment. All that I have done settles theoretical foundation for development of multi-energy powertrain control system.From 1990s, development of vehicles enters a new electronic era. The author summarizes development of vehicle electronic technology, ECU hardware and software technology, development of HEV, research state and our research project, and clarifies main research job of the thesis in chapter one.Main content in chapter two is HCU design plan research. First the author analyzes function of each powertrain of HEV in detail, and sums up all input or output signals of HCU. On the base of analysis, author brings forward hardware design plan and software design plan of HCU. High performance and high reliability is main control aim of HCU hardware design. HCU hardware design adopts module design method and is divided into I/O input module, I/O output module, A/D module, D/A module, serial communication module, CAN communication module and CPU module. Best feul economy and emission is control aim of HCU software design. The author analyzes four control methods that can be used to HCU software design-logic threshold value control, automatic adaptation control, fuzzy control, NN control and decides to adopt logic threshold control.According to HCU hardware design plan, it is mainly divided into 80cl96kc least system design, A/D conversion circuit design, D/A conversion circuit design, RS232 serial communication circuit design, I/O circuit design, power design and CAN communication circuit design. Reset circuit design, clock circuit design and memory extension circuit design are included in 80cl96kc least system design. Specially in memory extension circuit design , the author adopts dynamic bus technology, that is to say system reads program memory through 16 bits bus while reads or writes data memory through 8 bits bus. This can completely use 16-bit single chip process performance. A/D conversion circuit design is mainly signal input circuit design. For the reason that all input analog signals range is 0~ 10V, so author adopts multi-line analog switch plus reversed amplifier attenuation method. In D/Aconversion circuit design, taking account of whole system reliability and extend, author adopts photoelectric isolation and power isolation methods, and designs more one D/A conversion line. In RS232 serial communication circuit design, I uses drive chip MAX232 which makes whole circuit is simple and reliable. In I/O circuit design, I adopts relay. All input or output I/O signals are controlled through address that is unique in system. In HCU hardware design, taking account of cell voltage is very bad while vehicle is working, I selects DC-DC power chip which has wide input extend, high output precision and large drive power, and design two power supply system. In CAN communication circuit design, I selects PHILIPS chip SJA1000 that is stand-alone CAN controller and 82C250 that is CAN transceiver. In order to enhance anti-jamming capability of CAN bus node, TXO and RXO of SJA1000 are not connected directly with TXD and RXD of PCA82C250 but through high-speed optocoupler 6N137, so this realizes the application with galvanic isolation.According to HCU software design plan, author puts forth parallel connection auxiliary drive control strategy which divides vehicles working process into four states that is low...