非道路国四柴油机控制系统开发与试验

Based on the high-performance 32-bit microcontroller SPC57 platform, an improved nitrogen oxide (NOx) emission prediction algorithm has been developed for the control system software of non road national four diesel engines.This algorithm serves as the basis for establishing a NOx emission prediction model, adaptively changing the step size to cope with different airspeed conditions, considering the effects of convection, external source, and dissipation terms on the generalized continuous equation, and achieving computational prediction of the entire SCR post-processing catalyst in the time slice of the MCU.The main control strategy design introduces the internationally recognized V-mode development method, and is developed based on the Target-Link code generation tool. Complete the integration of system software based on the compilation platform. The whole software control system matched the non road Stage IV electronic controlled diesel engine prototype of YTO Corporation, thus completing the Functional verification.After bench testing, the NRSC and NRTC test cycle results of the original and tail exhaust meet the target requirements, which are equivalent to the performance of a foreign ECU. The NOx concentration after the SCR catalyst is 140 ppm, and the NOx concentration before the SCR catalyst is 1600 ppm. The conversion efficiency reaches 91.3%, and there is almost no NH3 leakage.The NRSC and NRTC results of the original & rear exhaust of this independently developed non road country IV ECU meet the target requirements, which is equivalent to the performance of a foreign type of ECU. The main performance and fuel consumption meet the target requirements of optimizing fuel economy. After calibration testing, the T4 temperature, T5 temperature control, and other indicators of driving regeneration and parking regeneration meet the functional requirements.