| 摘要 |
PURPOSE:To improve ignition performance in a low-temperature zone by a method wherein at least one part of the surfaces of the inner wall of the sub-combustion chamber and a glow plug is formed with an oxide layer or the like, a catalyst metal is born by the layer and, thereafter, the part is treated by alkali solution. CONSTITUTION:The diesel engine is equipped with the glow plug 1, a fuel injection valve 2 and the sub-combustion chamber 3. In this case, the intermediate layer 5 of Ni, Cr, Al alloy is formed on the surface 4 of the glow plug 1, for example, in the thickness of 50mum, the compound oxide layer 6 composed of 95% ZrO2, 5% CaO in weight ration is formed on the intermediate layer 5 in the thickness of 50mum by flame spray coating under nitrogen atmosphere and the layer 6 is impregnated into the solution of dinitrodiamino platinum and rhodium chloride, thereafter, the layer 6 is dried and calcined to bear the catalyst metal. Thereafter, the layer 6 is dipped into the 10wt% of potassium hydroxide solution of room temperature for a predetermined period of time, then, the layer 6 is washed with water and dried. According to this method, the ignition performance in the low-temeprature area may be improved and low emission as well as low noise may be achieved. |
