EXPERIMENTAL STUDY ON THE THERMAL MANAGEMENT AND ACTIVE CONTROL OF DIESEL ENGINE EXHAUST PRODUCTS BASED ON ENERGYSAVINGAND ENVIRONMENTAL PROTECTION REQUIREMENTS

摘要

With the increasingly stringent environmental standards,higher requirements are put forward for the emission of mechanical engines.Several active control methods of diesel engine optimization and their effects on exhaust emission were studied via engine bench test under medium and low loads (engine speed at 1200RPM,20% load rate and engine speed at 1400RPM,30% load rate).Experimental results indicate that injection advance angle and pressure are closely related to exhaust temperature.An optimized late post injection angle can increase the exhaust products temperature by 90°C.Moreover,intake throttle adjustment can also significantly increase the exhaust products temperature by 120 °C (at 20% intake throttle valve opening),accompanied by a reduction in hydrocarbon and CO emissions.Besides,the intake throttle valve opening was found to have a significant effect on the exhaust products temperature.Under medium and low loads conditions,an appropriate late post injection strategy coupled with matched intake throttle valve opening can be considered as a valid approach to increase the exhaust temperature.This study can provide a reliable reference for improving the working efficiency and exhaust emission quality of diesel engine.