Abstract: An object is to improve a trap effect to trap ignition fuel gas supplied to a pre-combustion chamber and reduce an amount of non-combusted ignition fuel gas flowing out of the pre-combustion chamber to suppress a decrease in combustion efficiency. A pre-combustion-chamber type gas engine includes: a pre-combustion chamber Sr disposed on a cylinder head portion 10; a spark plug 20 disposed on an upper part of the pre-combustion chamber Sr; a pre-combustion-chamber gas supply mechanism configured to supply ignition fuel gas “g” to the pre-combustion chamber Sr via gas supply channels for the pre-combustion chamber 22a and 22b with an opening on an upper part of the pre-combustion chamber Sr; and a check valve 24 disposed in the gas supply channel 22b for the pre-combustion chamber.

Abstract: A cylinder head of a stationary gas engine is provided with a cylinder internal pressure sensor. An engine frame is provided with an instrumentation device installation device. An amplifier for amplifying a signal detected by the cylinder internal pressure sensor is fixed to the instrumentation device installation device. The instrumentation device installation device includes a suspending tool formed of a fixing plate which is in contact with a horizontal plane and is fixed thereto by bolts, an extension plate bent at a right angle to the fixing plate, and a suspending plate bent at a right angle to the extension plate and arranged in parallel with the fixing plate, and a coil spring connected at one end thereof to the suspending plate, and connected at the other end thereof to a fixing band for holding the amplifier.

Abstract: A cylinder head includes a cylinder head body provided with intake and exhaust ports opened toward a combustion chamber and capable of being closed by valves, the intake and exhaust ports being separated from each other in a circumferential direction around a cylinder central axis. An opening section of at least one of the intake or exhaust ports facing the combustion chamber is provided with a seat surface centered on a valve axis and a tapered surface is disposed closer to the combustion chamber than the seat surface, the tapered surface gradually increasing in diameter closer to the combustion chamber. A central axis of the tapered surface is disposed eccentrically from the valve axis toward the cylinder central axis.

Abstract: Providing a control method for controlling an engine of a precombustion chamber type, whereby the misfiring in the precombustion chamber is surely prevented.

Abstract: A cylinder structure satisfies the following conditions: 12%?d/a?27%, where d is a distance between a cylinder inner surface 12a and an exhaust valve member 20b, and a is a diameter of the exhaust valve member; 40%?c/b?50%, where c is a length of a non-guided portion of the exhaust valve 20 located below a lower end of a sleeve 26 when the exhaust valve 20 is closed, and b is a diameter of a cylinder bore; and 0.5%?e/S?0.8%, where e is a gap between an exhaust valve rod 20a and the sleeve 26 and S is a diameter of the exhaust valve rod 20a.

Abstract: A control device of a premix combustion engine includes a hybrid turbocharger including a turbocharger having a compressor and a turbine, and a motor generator coupled with the compressor. A control unit controls the motor generator based on the operating conditions regarding a generator or the premix combustion engine and includes: an airflow rate computing unit for computing the necessary airflow rate required for the premix combustion engine, and an arithmetic unit for computing the power output or the rotation speed regarding the hybrid turbocharger to obtain the necessary airflow rate required for the premix combustion engine. Feedback control regarding the power output or the rotation speed as to the hybrid turbocharger is performed based on the computed results obtained by the arithmetic unit.

Abstract: In an auxiliary chamber gas supplying device for a gas engine including an auxiliary chamber gas supply path through which fuel gas is supplied to an auxiliary chamber, the auxiliary chamber gas supply path is connected to a fuel gas supply source through a solenoid valve, and when the solenoid valve is opened, the fuel gas, in an amount corresponding to an opened period of the solenoid valve, is supplied from the fuel gas supply source to the auxiliary chamber through the auxiliary chamber gas supply path, and the opened period of the solenoid valve is set in such a manner that a predetermined amount of fuel gas is supplied to the auxiliary chamber, and a restriction unit that extends the opened period of the solenoid valve is formed in the auxiliary chamber gas supply path.

Abstract: A cylinder head of a stationary gas engine is provided with a cylinder internal pressure sensor. An engine frame is provided with an instrumentation device installation device. An amplifier for amplifying a signal detected by the cylinder internal pressure sensor is fixed to the instrumentation device installation device. The instrumentation device installation device includes a suspending tool formed of a fixing plate which is in contact with a horizontal plane and is fixed thereto by bolts, an extension plate bent at a right angle to the fixing plate, and a suspending plate bent at a right angle to the extension plate and arranged in parallel with the fixing plate, and a coil spring connected at one end thereof to the suspending plate, and connected at the other end thereof to a fixing band for holding the amplifier.

Abstract: A cylinder structure satisfies the following conditions: 12%?d/a?27%, where d is a distance between a cylinder inner surface 12a and an exhaust valve member 20b, and a is a diameter of the exhaust valve member; 40%?c/b?50%, where c is a length of a non-guided portion of the exhaust valve 20 located below a lower end of a sleeve 26 when the exhaust valve 20 is closed, and b is a diameter of a cylinder bore; and 0.5%?e/S?0.8%, where e is a gap between an exhaust valve rod 20a and the sleeve 26 and S is a diameter of the exhaust valve rod 20a.

Abstract: A control device of a premix combustion engine includes a hybrid turbocharger including a turbocharger having a compressor and a turbine, and a motor generator coupled with the compressor. A control unit controls the motor generator based on the operating conditions regarding a generator or the premix combustion engine and includes: an airflow rate computing unit for computing the necessary airflow rate required for the premix combustion engine, and an arithmetic unit for computing the power output or the rotation speed regarding the hybrid turbocharger to obtain the necessary airflow rate required for the premix combustion engine. Feedback control regarding the power output or the rotation speed as to the hybrid turbocharger is performed based on the computed results obtained by the arithmetic unit.

Abstract: Providing a control method for controlling an engine of a precombustion chamber type, whereby the misfiring in the precombustion chamber is surely prevented.