車輛燃料節減을 위한 세라믹히터裝置 開發硏究 = The Development of a PTC Ceramic Heater for Automotive Fuel Saving

다국어 초록 (Multilingual Abstract)

In a carburating system, the fuel keeps vaporizing after sprayed to the carburator as droplets. But in the case of cold weather, plenty of them remain in the liquid phase, causing the increase of fuel consumption rates and harmful exhaust gas amounts. Those problems were known to be solved using the PTC ceramic heater for heating up the fuel into the cylinder in being supplied.
Purpose of this research is the development of a PTC ceramic heater for automotive fuel saying. This research emphasized the fabrication of newly developed step-shaped PTC heaters assembly and the obtaining the application result after installing them on the 1500cc engine.
The combustion pressure, the indicated mean effective pressure, the fuel consumption rate, the heat release, tile burned mass fraction of gas of the engine between with and without the PTC heater were compared as a function of crank angle. The reults were as follow:
1) With the PTC heater installed, the deviations of the maximum combustion pressure and the indicated mean effective pressure were improved by 2.0% and 0.8%, which brought the smoothing of drivability and the increase of engine power compared with engine without the heater.
2) The fuel consumption rates per unit power with PTC heater installed at 2000 rpm and the boost pressure of 300 mmHg and 400 mmHg were increased by 0.6∼8.1% compared with no PTC heater.
3) With 180℃ newly developed PTC heater installed, heat release time delays at the boost pressure of 300mmHg were made quicker by 1∼3 deg and the main combustion time by 5 deg compared with no PTC heater.
4) The 180℃ heater was the most effective of the three developed ones.
5) The introduction of new PTC heater improved the engine performance, which could bring the fuel saving and reduction of the harmful exhaust gas.