Mitsubishi Heavy Industries Limited

Mitsubishi Heavy Industries Engine & Turbocharger, Ltd.

Kenji Hiraoka

Satoshi Yamada

Akihiro Yuuki

Kazutoshi Nomura

Particular embodiments may provide a piston for a prechamber-type gas engine and a prechamber-type gas engine taking into consideration the shape of the piston top surface portion so that the region where flame propagation due to torch jet is delayed, a piston for a prechamber-type gas engine where torch jet formed by combustion a prechamber fuel in a precombustion chamber is injected to a main combustion chamber through a plurality of injection holes, may include a piston top surface portion comprising a land portion formed in a first region extending between axis line directions of adjacent injection holes, and the first region is positioned at a higher position than a second region extending across the axis line direction. The land portion may be formed on a cavity formed in the piston top surface portion. A plurality of land portions are provided corresponding to the plurality of injection holes, and the plurality of land portions are provided so as to be offset toward a same direction from a middle position between axis line directions of adjacent injection holes.

Piston for prechamber-type gas engine and prechamber-type gas engine

It is an object of the present invention to improve estimation accuracy of an air excess ratio within a fuel spray and quickly cause the air excess ratio to approximate to a target value when the engine load factor rises. An internal combustion engine control apparatus includes a parameter acquiring section to acquire an air intake parameter and a fuel parameter, a first estimation section to estimate an in-fuel-spray air excess ratio using the air intake parameter and fuel parameter, and a pressure calculation section to calculate, if the in-fuel-spray air excess ratio is less than a target in-fuel-spray air excess ratio, a necessary fuel injection pressure to match the in-fuel-spray air excess ratio with the target in-fuel-spray air excess ratio, in which if the necessary fuel injection pressure is equal to or less than a maximum injection pressure, fuel injection is to be performed at the necessary fuel injection pressure.

Growing community of inventors

Tokyo, Japan

Kenji Hiraoka