Gas engine, control system and control method for gas engine
AssigneeKawasaki Jukogyo Kabushiki Kaisha
InventorsShintaro Yoshihara, Youhei Nakajima, Hidekazu Iwasaki, Kenji Yoshimura, Yoshishige Sakai, Yoshirou Tokunaga
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Abstract
A control system in a gas engine includes a water injection means which injects water toward an interior of a cylinder in the gas engine; a water injection control means which controls the water injection section; and a knocking occurrence ratio measuring means which measures a measurement value of a knocking occurrence ratio in the cylinder. The water injection control means controls the water injection means to set the amount of the water injected toward the interior of the cylinder, based on a deviation between the measurement value and a target value.
Claims10
A control system in a gas engine comprising:
- a water injector which injects water toward an interior of a cylinder in the gas engine;
- a water injection control device which controls an amount of the water injected from the water injector;
- and
- a knocking occurrence ratio measuring device which obtains a measurement value of a knocking occurrence ratio in the cylinder, the knocking occurrence ratio being calculated based on a number of engine cycles during a predetermined period, which precedes a present time, and a total value of the engine cycles in which knocking has occurred within the predetermined period, wherein
- the water injection control device controls the water injector to set the amount of the water injected toward the interior of the cylinder, based on a deviation between the measurement value and a target value, and
- the water injection control device (i) sets a compensation amount of the water injection amount based on the deviation between the measurement value and the target value, and (ii) compensates the water injection amount set in a previous engine cycle based on the compensation amount.
A method of controlling a gas engine, comprising the steps of:
- obtaining a measurement value of a knocking occurrence ratio in a cylinder in the gas engine, the knocking occurrence ratio being calculated based on a number of engine cycles during a predetermined period, which precedes a present time, and a total value of the engine cycles in which knocking has occurred within the predetermined period;
- comparing the measurement value to a specified target value;
- and
- setting an amount of water injected toward an interior of the cylinder, based on a deviation between the measurement value and the target value,
- wherein setting the amount of the water injected toward the interior of the cylinder includes the steps of:
- calculating the deviation between the measurement value and the target value;
- setting a compensation amount of the water injection amount based on the deviation;
- and
- compensating the water injection amount set in a previous engine cycle based on the compensation amount.
Dependencies are inferred from the claim text.