Research On Each Cylinder Independently Controlled Parametric Bottom Drive Of Fuel System

The diesel engine is widely used in the power field because of its unique and superior performance.The electronic control high pressure fuel injection technology is one of the most effective means to improve the diesel engine power,lower pollution and fuel consumption.In order to strengthen the interchangeability of fuel system controller products,reduce the cost of the whole plant,and simplify the management difficulty of the controller,it is of practical significance to develop the engine seriation as the development direction of the diesel engine.In recent years,the performance of diesel controller on the hardware platform has been improved,and the software architecture has tended to be modular.Based on the high performance microcontroller MPC5554,and under the guidance of AUTOSAR software layered thinking;In this paper,the diesel engine fuel control system driver parameters,serialization methods are studied.First of all,based on AUTOSAR software architecture,and considering the parametric control fuel system design requirements;This paper proposes a kind of diesel engine ECU software framework and divides control programs into the application layer program and bottom driver program.And the bottom driver program is subdivided into bottom driver layer,abstraction layer and system service layer according the degree of correlation with micro controller hardware.The debugging and design of each function module in the bottom drive are also completed.Next,Multi cylinder engine fuel system parameters are extracted.This paper analyses diesel engine fuel system's actuator and the type and principle of the driving circuit,extracting parameters from the fuel system,besides analyzing the principle of realizing fuel injection sequence based on MPC5554.While the relationship between the timing and type of multi cylinder engine the characteristics are summarized,and the fuel system parameters and related models are also extracted.According to the extracted parameters,a parametric configuration method is designed to realize the matching function of fuel system.Then,the author has done a parametric design for the MPC5554 complex device driver,researching the structure of eTPU module which is most critical to fuel system,the module channel hardware details,and the principle of eTPU module programmable microcode.The author has developed the eTPU module microcode with synchronous function and injection output function,completing the design of the finite state machine and analyzing the processing mechanism of the crankshaft with abnormal signals and the strategy of real-time updating injection parameters.The designed microcode has parameterized configuration interface,and parameter configuration service is also supportive.The method of integrating microcode by eTPU module is studied,meanwhile both the process of module from initialization to normal work and the collaboration of the module with MPC5554 main CPU are researched too.In order to improve the reliability of the control system,the redundant system of the complex equipment is designed.The eTPU module and the eMIOS module are used to synchronize the timing and the fuel injection output respectively,which achieve the hot backup of the synchronization signal and the injection signal.Finally,the parameterized bottom driver is tested and experimented.Using the analog synchronous signal generated by the MPC5554 development board to test the function of synchronization,fuel injection,serialization and signal redundancy.The integration of each driver module and the application layer program is completed.The integration of 8-cylinder engine controller is also finished.The response and accuracy of the complex device driver are tested on the 8-cylinder controller experimental bench,while the hardware circuit function of the device is detected.The experimental results show that the complex device driver developed in this paper can synchronize the engine rapidly and make the engine run stably under the control of the application layer program.The control program has reasonable structure and can meet the need of actual uses.