Research And Development On Management And Control Unit In Efficient And Clean Combustion System

A new generation of internal combustion engine combustion theory characterized by homogeneous charge compression the fuel, low temperature combustion is a effective way to achieve efficient and cleaner-burning,and the electronic control technology is an effective means to achieve combustion theory. To this end,the paper uses the new architecture of the hierarchical module to complete the hardware and software development of efficient and clean combustion system for high-pressure common rail diesel engine control unit(EMS),based on the characteristics and control requirements of common rail technology and a new generation of efficient and clean combustionThe next-generation combustion technology requires fuel injection control system with flexible modulation fuel injection mode, precise control of the parameters of the injection timing and fuel and so on.This will put forward higher requirements on the injector drive circuit and the drive signal.For this reason,the paper designs the high and low voltage-dual power-driven- bilateral driven clamp pressure discharge injector solenoid valve driving circuit and optimizes the parameters of the drive wave. At the same time, design of a timing signal processing circuit.In this circuit,by low-pass filter, the differential input and adaptive peak detector noise suppression, and by the zero-crossing detection to avoid phase error caused by the speed different,speed signals and synchronization signals for real-time processing have been satisfied with the results and meet the requirements of the engine at full operating conditions are synchronous.In order to conducive to the integration of systems and the optimization of control strategy 、save memory and reduce the coupling between modules,be easy to modify, debug and port program, and achieve standardization and general of control software. This article referring to the AUTOSAR software architecture concepts、using the 32-bit high performance microcontroller MCF5235 introduced by Freescale,achieves the hierarchical and modular Software development of high pressure common rail diesel engine electronic control system based on Uc / os-ii operating system,achieve the synchronization of shared resources and the scheduling multi-task.In order to alleviate the burden on the CPU and reduce the external hardware configuration, and give full play to super time processing capabilities of the eTPU module in MCF5235 microcontroller.In this paper, referring to the AUTOSAR standard, developes a complex device driver component libraries, including demanding real-time engine timing signal decoding components and multi-pulse fuel injection control unit. Use eTPU_c to develop a multi-pulse MP(Multi_Pulse) function.In the condition of no cpu participation, according to the host to write parameter memory multi-pulse structure array of parameters achieves multiple pulse jet drive signal output.Each drive signal is composed of by the corresponding main pulse width、 zero pulse width and keeping wave.In French EFS pump test bench, scholars have tested the consistency of the channel injector driver circuit, the tests showed that the drive circuit meets the control accuracy requirements of efficient and clean combustion.Through the experiment of modulating multi-pulse injection mode on engine stand,it shows that the electronic control system developed in this paper can achieve the flexible modulation and free switching of the different injection modes, thus realize a synergistic control of the gas path and oil. And meet the technical requirements of the new generation of high-pressure common rail diesel engine clean and efficient combustion system of the control system,that more control objects、 complex control algorithms, harsh control accuracy and high real-time.In order to reduce the small-load conditions, especially the fuel consumption of idling condition the and emission, develop a random cylinder deactivation algorithm, and experiment the strategy of random cylinder deactivation, research the impact of law that change the number of cylinder deactivation cycle and cylinder deactivation,the fuel injection timing and injection pressure at idle and load conditions for the instantaneous speed of engine 、fuel consumption rate, energy distribution and emissions. The experimental results show that the random cylinder deactivation makes engineer work at idle and low load conditions. With the increase in the number of cylinder deactivation, correspondingly increase the fuel injection quantity of work cylinder. The combustion duration and heat release rate peak of working cylinder increase, more diesel fully burning, the lower burning loss rate and the reduction of the total area of the combustion chamber reduce the heat loss of the combustion process. Thereby,enhance the good thermal efficiency. This does a very high fuel efficiency and can also reduce the overall emissions.