Intelligent Simulation System Of Auto Engine Crankshaft And Camshaft Signal

With the development and expansion of the automobile industry, the corporate R & D capabilities in the market competition became more and more important. Traditional mechanical system has reached the limits of technology. The innovation of today's auto industry comes mainly from the automotive electronics. In China, the technological level in this field is still in its infancy, therefore, actively developing the automotive electronics industry is the key of China's automotive technology.With the policy support in the country and the community's joint efforts, China's automotive electronics industry has achieved gratifying results. In the field of automotive electronics, electronic control unit (ECU) is particularly important. ECU accept a variety of sensor signals, processing the information, analysis, computation, and then send control command to the fuel injector, ignition controllers, and other actuators . Developing ECU needs a of a large number of long-term environment in the laboratory experiment for a variety of vehicles and testing vehicles for using the environment not only in real time and space is a constraint, but also great risk. The developers use the specific equipment to simulate the vehicle environment, originally these devices were purchased from abroad, consumes a lot of money. In this case, our laboratory has developed several sets of low-cost vehicle simulation system, which saves a lot of money. But the past GM vehicle simulation systems have a problem, that is, each system is only suitable for a particular engine electronic control unit. The main reason is that the crankshaft camshaft changed with the engine module. If the crankshaft camshaft signals can be changed with the engine module, the problem of poor general will be solved. For the above, the article describes a way to simulate a crank camshaft signal simulation system design for any engine electronic control unit.System hardware consists of processor module, signal output module, display module, adjust the module, communication module, power module. The system uses the STM32 family of microcontrollers STM32f107 as the system's main processing chip. Signal output unit is divided into Hall-type module and magnetic-electric module. Processor I / O port output Hall-style primary signal, after the 7407 pairs of signals by the current drive capability to enlarge. Magneto-electric signal generated by means of DAC0832, DAC0832 produce unipolar processor controlled magnetic signal, through the filtered circuit, voltage amplifier, power amplifier circuit through the transformer in differential form the final input to the ECU. Display module use LED as the display terminal, mianly display the signal type, crankshaft speed, crankshaft camshaft phase and other information. System uses dynamically refresh method, saving the processor's hardware resources. Through the knobs and buttons ,you can easily adjust the type of signal, crankshaft speed, crankshaft camshaft phase and other information. At the same time the system is equipped with USB and CAN communication module, USB is mainly for PC communication, through the PC software can be smart on the lower machine configuration, CAN is mainly for the ECU communicate. After a 220-volt AC transformer 220V ~ 25V rectified after the bridge, filter circuit, the voltage regulator chip through various power supply required by the system.The system has debugged with a variety of engine control units of the FAW Technology Center. The experiments show that the development of the system is successful and it has been applied to a specific project.