Improvement for starting ability of dump truck fixed turbo charged and intercooled heavy duty diesel engine

摘要

This paper describes the improvement for starting ability of the latest Hino K13C (L6/13liter) turbo charged and intercooled heavy duty diesel engine TI engine) with a common-rail fuel injection equipment. Generally TI engine is well known as it has a good performance for the fuel consumption and the emission comparing to naturally aspirated V8 engine (NA engine) but the slope starting ability. So a dump truck fixed TI engine has to be also fixed a multi speed transmission. Therefore, without the multi speed transmission, the dump track fixed TI engine is developed by this study. At first the robustness feeling during the clutch engagement at slope starting is investigated by the vehicle experiment with the same horse powered TI engine and the 20 litter NA V8 engine. And secondly, low speed engine torque performance is studied by the simulation model considered driver is operation of the accelerator and the clutch at the slope starting. Because the turbo response, which a common-rail fuel injection equipment brings, is rather better than one of current TI engine, this new TI engine is considered as NA engine with the engine property of torque curve lower at left. This simulation shows some solutions of the engine torque design in order to keep the same robustness feeling as NA engine at the clutch fully engaged. Among these ideas, a slope starting assistant system, by which the engine performance is controlled according to the angle of inclination, is developed. This new system is working with the collaboration of Easy & Safety starting system and the Engine governor control ECU. The angle of inclination is detected during stopping on the slope. And simultaneously this system selects temporally governor performance of the idling speed and the sensitivity of the engine speed control. Just before the clutch is half engaged, the governor performance is switched to this temporal condition so as to keep the engine speed constant at the clutch fully engaged. Finally this temporal performance is switched to normal condition again when a driver shifts up With this new system, the good slope starting ability as same as that of NA engine can be achieved for the dump truck fixed K13C engine.