Engine system

An engine system comprising:

• an engine in which fuel gas combusts together with hydrogen;
• a starter configured to start the engine;
• an intake passage through which air supplied to the engine flows;
• an exhaust passage through which exhaust gas generated in the engine flows;
• a first flow rate control valve provided on the intake passage and configured to control a flow rate of air supplied to the engine;
• a first fuel supply valve configured to supply the fuel gas to the engine;
• a reformer including a catalyst that decomposes the fuel gas into hydrogen and configured to reform the fuel gas to generate a reformed gas containing the hydrogen;
• a first air flow path through which air supplied to the reformer flows;
• a second flow rate control valve provided on the first air flow path and configure to control a flow rate of air supplied to the reformer;
• a second fuel supply valve configured to supply the fuel gas to the reformer;
• a reformed gas flow path through which the reformed gas generated by the reformer flows toward the engine;
• a combustor including an ignition unit and configured to generate combustion gas that heats the catalyst, the ignition unit being configured to ignite the fuel gas;
• a second air flow path through which air supplied to the combustor flows;
• a third fuel supply valve configured to supply the fuel gas to the combustor;
• an outside air temperature detection unit configured to detect an outside air temperature;
• a catalyst temperature detection unit configured to detect a temperature of the catalyst;
• an operating environment detection unit configured to detect an operating environment of the combustor;
• a combustion time determination unit configured to determine combustion time of the combustor based on the outside air temperature detected by the outside air temperature detection unit, the temperature of the catalyst detected by the catalyst temperature detection unit, and the operating environment of the combustor detected by the operating environment detection unit;
• and
• a start control unit configured to, at a time of starting the engine, perform ON control on the starter and the ignition unit and control the first fuel supply valve, the second fuel supply valve, the third fuel supply valve, the first flow rate control valve, and the second flow rate control valve to open, and thereafter when the combustion time determined by the combustion time determination unit elapses, perform OFF control on the ignition unit and control the third fuel supply valve to close.