Study On Independent Controlling Bi-Fuel Engine Match Design And Fuel Switch Technology

Alternative fuel LPG, with the good economy, emission performance and mileage comprehensive advantages, takes a good market prospect under the whole circumstances of advocating energy-saving and environment-protecting at the current. The paper does research on the development method of independent controlling Bi-Fuel engine match design and fuel switch technologyAccording to analyzing the existed bi-fuel energy control method, the paper comes up with the independent control gasoline/LPG bi-fuel engine control method and dual ECU sensor signal distribution method, simplifies the actuator control switch by using the igniting switch signal control, studies the state converting process of gasoline to LPG and LPG to gasoline, the selecting method of engine fuel state, ECU power control and working state control. Through the fuel switch experiment on the vehicle, it validates the effectiveness of proposed independent bi-fuel control method.According to the way of fuel injection, engine and vehicle demands, it performs the type-selecting, matching and arranging on the LPG fuel-supplying components. It analyzes the feasibility of weighing type injector measurement method based on flow meter and gas tank targeting the matching requirement of LPG injector. It comes up with measuring method of the container drainage weighing injector dynamic fuel measure, and analyzes the related factors which influence the chamber pressure in the injection process by establishing mathematical model. It put forward the improvement direction of the gas collecting container, explains the measuring and calculating method of injection volume, establishes dynamic injection volume measuring device of the injector, introduces the structure and working process of the measurement system. It verifies the feasibility of dynamic jet volume measurement methods proposed in this paper through the injector repeated measuring experiments. It performs the flow characteristic test, the voltage characteristic test, the pressure characteristic test and injector group consistency test on the injector. The experimental results show that dynamic jet volume measuring method proposed in the paper can assist the match of injector better.It designs the engine control module power source of LPG state, the microprocessor, sensor signal processing and the related hardware design of actuator drive, and finishes the designs of engine function control software and the timing-sequence control drive software among the interface of the jet valve, igniting coil, crankshaft position signal sensor, camshaft position signal sensor and knock sensor. It analyzes the related factors which influence the timing-sequence control drive real-time, puts forward the method of promoting timing-sequence control drive real-time, and examines the real-time of timing-sequence control drive.It contrastively analyzes the dynamic difference between the gasoline/LPG bi-fuel engine developed when using the different fuels, the experimental results show that the maximum torque decreased by4.8%under the condition of the engine LPG, the maximum power is down6%. The arctic calibration experiment on the whole car shows that the bi-fuel engine fuel switch system and LPG engine control system work normally in the arctic environment; the driving performance of bi-fuel vehicle is excellent in the arctic environment, which achieves the expected development objective and requirement.