The Research Of Turbocharged Gasoline Engine Electronic Control Strategy Based On ASCET

In recent years, both production and sale of vehicle have created a higher new recorddue to the booming development of domestic automobile market. However, theenvironmental pollution problems caused by vehicle exhaust is becoming much moresevere every day. Especially the lower air quality and thick haze weather which isbesetting the whole Chinese society more seriously than ever. Therefore, reducingvehicle exhaust emissions is the current important goal. Turbocharge technology whichhas been widely used can significantly improve vehicle dynamic performance whilereducing engine pollution. At the same time, applying electronic pressure chargingregulation can precisely control boost pressure in real-time. Thus overcoming manydrawbacks of mechanical pneumatic boost control method. The development scheme ofautomotive embedded software has put forward new requirement to the research ofelectronic control system. Based on the backgrounds and situations above, the studyfocuses on the following aspects:Firstly making an introduction of internal automotive market condition and theimpact of fog and haze weather in2013. Aiming at the vehicle emissions is the maincause of environmental pollution. Thus stressing the importance of the research onturbocharge technology and pressure charging regulation electronic control system.After analyzing several often-used boost pressure methods, choosing the internalwastegate as the actuator of electronic turbocharging system. Introducing the basicprinciples of PID industrial control strategy. Because of the V-shaped developmentprocess is currently popular in the automotive electronic product development, thus theembedded software ASCET, which based on the V-shaped development process, isdetermined to use in the electronically controlled turbocharge system as a graphicalmodular development platform. Since ASCET is a platform which based onOSEK/VDX standard and V-shaped development process, thus simplifying the complexmethod in designing turbocharge system, it also greatly increase the performance andefficiency in automotive product development. The turbocharged gasoline engine airsystem mathematical model is established and each input and output demand in thepressure charging regulation system is determined. Making research on the process ofself-definition of system variables and parameters. Based on the turbocharged gasolineengine electronic control algorithms using ASCET-MD software to build a model PCR system control strategy, including: calculation of mass flow through throttle valvemodule; calculation of desired boost pressure module; pressure upstream throttlecontroller module; calculation desired lift of TC-actuator module; calculation boostpressure set value module; calculation current position of boost pressure actuatormocule. After the modeling process, the ECU readable product level C code isgenerated by ASCET-SE toolset. The offline simulation capabilities of ASCET is alsoused, through comparing the change trend and corresponding between input and outputvariables, thus verifying the correctness and validity of the modeling which used inpressure charging regulation system. All indicates that the loop control in pressurecharging regulation system will make engine more reliable and stable. It will alsoprovide reference to the development methodology process of other functional modulesin automotive electronic control system.