| 摘要 |
<p>The invention concerns a four-stroke gas engine with spark ignition equipped with a high pressure fuel feed system (3) for direct fuel injection into the combustion chamber of each cylinder of the engine, a powered throttle valve control unit (4) for measuring the amount of air passing into the engine (1) a catalyst (7) placed in the exhaust line (6) at the outlet of an exhaust gas manifold, a temperature sensor (9) placed in the exhaust line (6) downstream of the catalyst and a control computer (5) receiving data concerning the engine rotational speed, the position of the accelerator pedal, the engine air load, the temperature levels of the engine and of the exhaust gases at the catalyst outlet. The invention is characterised in that when the heat conditions of the exhaust line (6) are insufficient to ensure efficient treatment of the polluting agents emitted by the engine, the control computer (5) controls for each cylinder, the injection of the global amount of fuel required in two cycles, the first during the intake phase and the second during the compression phase.</p> |
