Maintaining the proper fuel injection timing, injection pressure and spraying condition.
1. Comparison between diesel knock and gasoline knocking
Diesel knock and gasoline knocking both have a sudden rise of compression pressure during the combustion period. However they vary basically by timing, cause and condition. (1) Diesel knock Diesel knock occurs because of difficulties with self-ignition. Also, it occurs when the combustible air-fuel mixture burns all at once and explosively causing the pressure to rise suddenly. In a diesel engine, it is difficult to distinguish between normal combustion and diesel knock. Therefore it can only be distinguished by whether a sudden rise in pressure knocking noise is generated by or by which portion of the engine is shocked. (2) Gasoline knocking Gasoline knocking occurs when selfignites. In a gasoline engine, normal combustion and knocking are completely different.