Gas engine, control device, and control method

Abstract

To provide a gas engine that can suppress the occurrence of backfire. [Solution] A gas engine according to one aspect of the present disclosure includes a control device that performs a backfire suppression process, which involves injecting water from a water injector at a timing such that water spreads into the combustion chamber after the intake valve opens the intake port, and gaseous fuel spreads into the combustion chamber after the water has spread into the combustion chamber.

Claims

1. Cylinder and A piston that reciprocates within the cylinder, An air supply port for supplying air to the combustion chamber defined by the cylinder and the piston, An exhaust port for discharging exhaust gas from the combustion chamber, An air supply valve that opens and closes the aforementioned air supply port, An exhaust valve that opens and closes the aforementioned exhaust port, A fuel injector that injects gaseous fuel into the aforementioned air intake port, A water injector that sprays water into the air intake port or the combustion chamber, The water injector comprises a control device capable of controlling the timing at which it injects water, The control device performs a backfire suppression process by injecting water from the water injector at a timing such that water spreads into the combustion chamber after the intake valve opens the intake port, and gaseous fuel spreads into the combustion chamber after the water has spread.

2. The fuel injector injects gaseous fuel before the intake valve opens the intake port. The gas engine according to claim 1, wherein the control device in the backfire suppression process injects water from the water injector before the fuel injector injects gas fuel.

3. The fuel injector injects gaseous fuel into the gaseous fuel injection section of the air intake port, The gas engine according to claim 1, wherein the water injector injects water into a water injection section located downstream of the gas fuel injection section of the air intake port.

4. The gas engine according to claim 1, wherein the control device performs the backfire suppression process when at least one of the following backfire occurrence conditions is met: the mean effective pressure is equal to or greater than a predetermined reference effective pressure; the output ratio is equal to or greater than a predetermined reference output ratio; the mixing ratio is equal to or greater than a predetermined reference mixing ratio; and the intake / exhaust pressure difference is equal to or less than a predetermined reference pressure difference; and stops the backfire suppression process when the backfire occurrence conditions are not met.

5. The gas engine according to claim 1, wherein the gas fuel is a gas containing hydrogen gas.

6. Cylinder and A piston that reciprocates within the cylinder, An air supply port for supplying air to the combustion chamber defined by the cylinder and the piston, An exhaust port for discharging exhaust gas from the combustion chamber, An air supply valve that opens and closes the aforementioned air supply port, An exhaust valve that opens and closes the aforementioned exhaust port, A fuel injector that injects gaseous fuel into the aforementioned air intake port, A gas engine comprising a water injector that injects water into the air intake port or the combustion chamber, wherein a control device capable of controlling the timing at which the water injector injects water, A control device that injects water from a water injector at a timing such that water spreads into the combustion chamber after the air intake valve opens the air intake port, and gaseous fuel spreads into the combustion chamber after the water has spread.

7. Cylinder and A piston that reciprocates within the cylinder, An air supply port for supplying air to the combustion chamber defined by the cylinder and the piston, An exhaust port for discharging exhaust gas from the combustion chamber, An air supply valve that opens and closes the aforementioned air supply port, An exhaust valve that opens and closes the aforementioned exhaust port, A fuel injector that injects gaseous fuel into the aforementioned air intake port, A gas engine comprising a water injector that injects water into the air intake port or the combustion chamber, wherein a control method for controlling the timing of water injection by the water injector, A control method in which water is injected from the water injector at a timing such that water spreads into the combustion chamber after the air intake valve opens the air intake port, and gaseous fuel spreads into the combustion chamber after the water has spread.

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