One of the characteristics of combustion in a diesel engine is diesel knock.
Knocking in a gasoline engine and knocking in diesel engine are the same in that they occur due to a sudden pressure increase during the combustion process. However, there are a number of fundamental differences betwen the two in terms of the timing, cause, and state of knocking.
Diesel knock occurs when the combustible gas mixture produced during the ignition lag period burns explosively and the pressure rises suddenly.
Knocking in gasoline engine occurs when self ignition occurs too easilly, but diesel knock occurs when self ignition does not occurs easilly enough. Therefore, the causes of two types of knocking are completely opposite from one another.
In gasoline engine , there is large difference between normal combustion and knocking combustion. In a diesel engine, knocking combustion is hard to distinguish during operation. Therefore, knocking is distinguished from normal combustion according to whether or not a sudden pressure increase generates a hitting noise or brings about shock to engine parts.
Because of the nature of its cause, diesel knock can be prevented by shortening the ignition lag period. Fuel injection nozzles are generally designed to lower fuel injection during the ignition lag period.
Knocking in a gasoline engine and knocking in diesel engine are the same in that they occur due to a sudden pressure increase during the combustion process. However, there are a number of fundamental differences betwen the two in terms of the timing, cause, and state of knocking.
Diesel knock occurs when the combustible gas mixture produced during the ignition lag period burns explosively and the pressure rises suddenly.
Knocking in gasoline engine occurs when self ignition occurs too easilly, but diesel knock occurs when self ignition does not occurs easilly enough. Therefore, the causes of two types of knocking are completely opposite from one another.
In gasoline engine , there is large difference between normal combustion and knocking combustion. In a diesel engine, knocking combustion is hard to distinguish during operation. Therefore, knocking is distinguished from normal combustion according to whether or not a sudden pressure increase generates a hitting noise or brings about shock to engine parts.
Because of the nature of its cause, diesel knock can be prevented by shortening the ignition lag period. Fuel injection nozzles are generally designed to lower fuel injection during the ignition lag period.
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