Electronic Control System Research Of Natural Gas/Gasoline Dual Fuel Engine

Oil resources crisis,environmental pollution,emission regulations have become a huge obstacle to the development of the automotive industry.In order to solve thes e problems,clean energy is an important way to solve these problems.The advantag es of natural gas is rich in resources,cheap,less pollution.Now natural gas engine has become the focus of research.Based on the gasoline engine,this paper research es the electronic control system of natural gas / gasoline dual fuel engine.This paper describes the physical properties of CNG and gasoline.This paper i ntroduces the fuel supply mode of dual fuel engine,and the control principle of nat ural gas / gasoline dual fuel engine.On this basis,the overall scheme of electronic control system of natural gas / gasoline dual fuel engine is put forward.Based on the overall scheme,the hardware circuit of the fuel ECU was designe d with Freescale's MPC5634 M microcontroller as the core.The hardware circuit mai nly includes the circuit module: MPC5634 M peripheral circuit,power supply module,analog signal processing module,pulse signal processing module,drive module and communication module.The switch circuit is designed.The single chip solution is used to solve the signal processing problem of the crankshaft sensor.The PCB of th e ECU and the switch is designed.The circuit is simulated using the Multisim soft ware to check the correctness of the circuit design.The main program architecture a nd some software of the dual fuel engine are designed by modularization.The contr ol logic of analog signal acquisition,pulse signal acquisition,jet control,oil and gas conversion control based on MPC5634 M micro controller are researched.It is provi ded a solution for the development of part of the gas ECU program.Based on the DFMA15 gasoline engine,the engine test bench was built.A bett er ratio of oil and gas is obtained with dynamometer and PC software.In the modif ied vehicle,engine emissions test is carried out.When using natural gas,the engin e emissions meet the requirements.