| In addition to diesel engine combustion efficiency, power density, reliability and other characteristics, and CO2 emissions and energy-saving advantages, including the gasoline engine is all the heat engine can not be replaced. With the world increasingly stringent emissionsregulations and a serious shortage of energy and force towards the low-pollution diesel engine, low fuel consumption and high specific power of direction. With the increasing development of diesel technology, it is increasingly found in the endless charm of Diesel Engine: high-torque, high-life, low fuel consumption and low emissions, diesel solve the energy issue has become the most realistic and most reliable means. "Green diesel" is the needs of modern times, Diesel is also the inevitable trend of development. Reduce diesel engine emissions, improve power, economy the key to improve the combustion process. The combustion process is to improve the fuel injection system, intake system and combustion chamber structure of the three good mix and match, jet fuel injection system which plays a most important role. Common Rail Diesel Engine system is to improve engine performance and reduce its harmful emissions, one of the most effective technology.Usually diesel engine has a poor and changeable working environment, to ensure that the diesel engine electronic control system can work reliably in the weather, mechanical, electrical performance under all conditions, we request the ECU can deal with the sensor signal in variety of environmental. However, during the software and hardware debug of ECU, it is difficult to issue the original car signal and the various electromagnetic valves, relays, etc. for the debug. But due to the confidentiality of foreign automotive electronic technology and high product prices, the domestic automotive manufacturers are very difficult to use it. Therefore, the development of a low-cost automated test systems for analog signal ECU hardware and software testing has a very important significance.In this paper, both at home and abroad access to the relevant Common Rail Diesel Engine ECU and USB, vehicle CAN network-related information about the required Common Rail Diesel Engine ECU sensor signals of various types of vehicles of various types and Common Rail Diesel Engine load characteristics, and in accordance with Common Rail Diesel Engine ECU hardware and software debugging needs, developed a simulation system Common Rail Diesel Engine ECU.This system can simulate some sensor signal of common rail diesel engine's ECU, including analog signal, switch signal, speed signal, crankshaft and camshaft signal and so on. In addition, this system can test the control and display signal of ECU, including electromagnetic valve, relay signal and speed signal of the drive panel. This system can provide the CAN bus interface for ECU, communicate with the ECU and know about the control information from ECU .In addition, this system can display and adjust with PC through CAN-USB conversion unit, which facilitate the archiving of information management.This article focuses on the communications components of the system created successfully. USB1.1 bus such as data acquisition, as well as PC application interface development, introduced a simulation system for communication of CAN application layer communication protocol and the CAN communication mechanism for receiving and handling, a designated system of internal CAN communication protocol, described in detail CAN-USB data the idea of conversion. Papers of the software simulation system design and main modules of the software approach are introduced. The main control system of modular design, that is, the system is divided into several functional modules, the main program is only the implementation of scheduling functions, is responsible for calling the function module rotation procedures.Common rail diesel engine ECU assistant debug system belongs to an automated tool for the automotive electronic development. It is a set of signal simulate and test system based on the common-rail diesel engine electronic control unit. It combines virtual instrument technology and field bus communications technology and so on. The framework is designed in blocking. And it breaks the complicated system into some relatively simple systems, provided with adequate hardware and software support. Through the use of assisted human-computer interaction interface, debugging system can simulate various sensor signals and detection of various common-rail diesel engine loads conveniently and quickly. At the same time, this system is comprehensive, easy to use, and is in favor of automotive manufacturers to promote to use it. |
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