Electric Supercharging System Design And The Research On The Effects Of Turbocharged Diesel Engine Working Condition Of Low Speed Performance

Energy and environment problems loom large,increasingly stringent emission regulations,promoting the extensive application of turbocharged diesel engine.Although turbocharged diesel engine with high thermal efficiency value,big output power,high energy utilization rate,etc.But turbocharged diesel engine emissions of NOx and PM(particulate matter)is very serious,can cause serious harm to the environment,and turbocharged diesel engine at low speed torque deficiencies and accelerate the problem of smoke.According to the above problem,this paper presents a performance at low speed when using electric supercharging system instead of turbocharging system for quick intake of technical solutions.Designed a set of electric supercharging system and parallel turbocharging system,so as to improve the transient response characteristics of the turbocharger,improve the turbocharged diesel engine combustion quality,improve its dynamic performance and emissions,and by the method of bench test analysis of the system of turbocharged diesel engine working condition of low speed performance impact.The main research work is as follows:1、In order to solve the lack of turbocharged diesel engine torque at low speed and accelerate the problem of smoke,the use of electric supercharging system was put forward with the original turbocharging system in parallel,in turbocharged diesel engine at low speed when a quick intake of technical solutions.Designed a new back plate structure,using the method of impeller and high speed motor coaxial connection,solved the problem of impeller shaft and motor shaft screw loose connection,improved the transient response and the stability of the electric compressor.2、In Altium Designer as a platform,using the modular design of electric control system hardware circuit,digital signal and analog signal separation,signal acquisition and power driven separation,effectively avoid the interference between the signals,enhanced the stability of the ECU,and completed the design and manufacture of PCB.3、With Microchip PIC16F887 software development environment MPLAB-IDE as a platform,using C language for electric supercharging system master control program,sensor signal collection and processing procedures,the compressor cooling motor driver for the writing and debugging,at the same time in order to the working hours of electric supercharging system for precise controlled,developed based on the working condition of control strategy,and by the fuzzy control method to realize.4、Based on engine bench test method to study the pressurization system affect the performance of diesel engine at low speed condition.In order to satisfy the requirement of electric supercharging system and the original turbocharging system in parallel,during the trial modified the engine intake pipe road,to make the electric supercharging system and the original turbocharging system noninterference when intake the air.Completed the same air inflow performance impact test for different load conditions and different air inflow performance impact test on the same working condition,comparative analysis the electric supercharging system affect the performance of turbocharging diesel engine at low speed working condition,the experimental results show that:(1)development of the electric supercharging system able to work reliable and effective;(2)the working condition of low speed,electric supercharging system of diesel engine power performance and fuel economy is improved;(3)the electric supercharging system of diesel engine smoke and NOx emissions significantly lower,but the CO emissions increased slightly.