FUEL SUPPLY CONTROLLING DEVICE FOR PRECHAMBER GAS ENGINES

A fuel supply controlling device (100) includes: an auxiliary chamber fuel supply valve (18) configured to supply a gaseous fuel to an auxiliary chamber (24); a non-return valve (19) interposed between the auxiliary chamber fuel supply valve (18) and the auxiliary chamber (24), the non-return valve (19) being configured to block a reverse flow from the auxiliary chamber (24); a valve state detector (51) configured to detect an operating state of the non-return valve (19); a rotation angle detector (56) configured to detect a rotation angle within an engine cycle; and a controller (60) configured to determine an operation command value of the auxiliary chamber fuel supply valve (18). The controller (60) measures an actual operating state of the non-return valve (19) based on signals from the valve state detector (51) and the rotation angle detector (56) in association with the detected rotation angle, and corrects the operation command value of the auxiliary chamber fuel supply valve (18) such that the measured actual operating state is brought close to a target operating state.