Patent ID: 9447752
Filing Date: 2016-09-20
CPC Classification: F01N,F02D,F02M,Y02T

Claim Text:
1. A detection method of an airtight failure in a working-gas circulating type gas engine, said working-gas circulating type gas engine leads fuel gas, oxidizer gas, and working gas to a combustion chamber and burns said fuel gas in the combustion chamber to obtain motive power, and said working-gas circulating type gas engine comprises: a fuel gas supplying device that comprises a fuel injection valve and supplies said fuel gas using said fuel injection valve, an oxidizer gas supplying device that comprises an oxidizer gas supplying valve and supplies said oxidizer gas using said oxidizer gas supplying valve, a working-gas supplying device that comprises a working gas supplying valve and supplies said working gas, using said working gas supplying valve, a sealed circulation passage which circulates burnt gas emitted from an exhaust port which communicate to said combustion chamber to an intake port which communicates to said combustion chamber circulate therethrough, and a combustion product removing device that comprises at least one of a condensation machine and an adsorption material and separates and removes combustion product produced by combustion of said fuel gas from said burnt gas using said at least one of said condensation machine and said adsorption material, characterized in that; said working-gas circulating type gas engine further comprises: a sensor that detects gas quantity in said circulation passage, and an airtightness judging device that is constituted by an ECU comprising a CPU and a memory storage, and judges the airtightness of said circulation passage by said CPU performing a processing specified by a program corresponding to said detection method, and said detection method includes: a surplus gas supplying step in which at least one of said fuel gas, said oxidizer gas, and said working gas in an extra predetermined quantity 1 in addition to the quantity needed for compensating for a decline of the quantity of said at least one of said gases associated with operation of the engine is supplied as surplus gas into said circulation passage, a circulating gas increase detecting step in which a circulating gas increase which is an increment of the quantity of gas in said circulation passage before and after said surplus gas supplying step is detected by said sensor, and an airtightness judging step in which it is judged that there is an airtight failure in said working-gas circulating type gas engine when the absolute value of a quantity deviation of circulation gas which is the difference between said predetermined quantity 1 and said circulating gas increase is a predetermined quantity 2 or more, while it is judged that there is no airtight failure in said working-gas circulating type gas engine when the absolute values of said quantity deviation of circulation gas is less than said predetermined quantity 2.