Turbocharged DI Dual VVT Gasoline Engine Load Control Research

With increased environmental pollution,energy crisis,countries in the world have put forward more stringent emissions regulations,energy conservation has gained.Compared with the traditional gasoline engine,small gasoline strengthened function to reduce pumping loss,has good power and economy,has gradually become the mainstream auto market.Direct injection,turbocharging and dual VVT technology is small gasoline engine core of energy conservation.Based on a 1.0T three-cylinder direct-injection dual VVT gasoline engine develops Open-ECU controller architecture,based on the torque designs control strategy,Based on active disturbance rejection controller to control actuator,to achieve stable operation of the engine,and optimized control.First,build a test bench,development hardware platform and software platform,hardware platform to Infineon’s 32-bit multi-core microcontroller TC27 x as the core control unit,including power management,minimal system,signal acquisition,boost booster circuit,ignition drive,low-side drive injector drive,Can communication module.Basic software design includes engine position,complicated signal drive,A/ D converter,I/O input and output,communication,fault diagnosis and task scheduling module,to lay the foundation for the stable operation of the engine.Secondly,based on the torque control strategy for the development of the whole architecture,which includes the torque management,air model,the boost pressure control,throttle control,VVT control,manifold pressure control,air-fuel ratio control,rail pressure control,ignition angle control,knock control state machine engine,engine protection and fault diagnosis module.Strategies based on the accelerator torque,the torque control in the slow process by controlling the target intake air mass flow,thereby controlling the throttle;the torque control in the fast process by controlling the target efficiency of ignition,thereby controlling the ignition angle to achieve fast response demand torque.In the final torque management module outputs the target of actuator in air system,to achieve the throttle,the turbocharger and the VVT by torque distribution.According to each actuator’s characteristics,establish the appropriate controller model,achieve fast response and stable control of actuator,optimize the engine control performance.Again,in the actuator control process,the PID controller is designed to control the various actuators,in the debugging process,found a single PID parameters are often unable to meet the needs of complex control objects,often with sub-type PID,it requires a lot of the parameter calibration,increasing the difficulty of parameter adjustment and control of the exhaust valve and VVT are faced with different levels of external interference,it is difficult to achieve the desired control effect.Based on active disturbance rejection controller ADRC(Active Disturbances Rejection Controller)control thought,to characterize the ADRC need tuning parameters of bandwidth,use the bandwidth debugging parameters directly have an effect,through modeling and analysis of a large number of experiments,ADRC control can achieve good control effect.In summary,the present study proposed based torque Turbocharged Dual VVT gasoline engine load control strategy to achieve rapid and stable control of the load,compared with the traditional control strategies,with the tracking accuracy,transient response and commissioning of parameters certain advantages.