| This paper is aimed at the diesel engine with inline pump. During design ,thourgh the overall considering of operating speed, processing ability and development cost,a new research scheme of diesel ECU was put forward. The system proposes a new way to design the ECU which combines the 16 bits embedded MCU(MC9S12DP256B) and the real-time operating system(μC/OS-Ⅱ) . By substituting traditional single task mechanism with multi-task mechanism ofμC/OS-Ⅱ. Through debugging test of the software and hardware, speed, accuracy and real-time had been measured and the control parameters had been calibrated.Combining with the requirement of the research, the control strategy of the electronically controlled inline pump diesel engine and the design method of ECU ,which includes determining control function, defining key of control links and control scheme, compartmentalizing the sub-functions and PID control algorithm etc. have been put forward and accomplished the accurate control to the execution.The MC9S12DP256B is adopted to meet the function requirements of ECU. The schematic diagram and PCB is designed as well as the consist of schematic diagrams and the detailed introductions of the chips used in that part are analyzed. The characteristics of electronic control diesel engine are multi-tasks and real-time accuracy, so the control software has been developed by using the imbedded systemμC/OS-Ⅱ. In the same time ,the clock ticks and synchronization of tasks have been designed and the priority of task has been divided reasonablely, because of these,the controling and management of engine and the operating system have been accomplished. Furthermore, the implemented upgrade mechanism which makes it easy to maintain and update the system, prolongs its life-cycle at the same time.The debugging test indicated that the software and hardware systems,studied and developed in this paper,not only meet the demands, but also has excellent control function. |
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