| 摘要 |
<p>INTERNAL COMBUSTION ENGINE An internal combustion engine is disclosed which includes a plurality of cylinders split into first and second groups, the first group of cylinders operative regardless of engine load conditions and the second group of cylinders inoperative when the engine is under low load conditions. The engine comprises an air intake passage having therein a throttle valve, first valve means provided in the air intake passage to form an intake chamber communicating with the second group of cylinders and isolated from the first group of cylinders when closed, an exhaust passage divided at its upstream portion to form first and second exhaust passages for passing therethrough the exhaust gases discharged from the first and second groups of cylinders, respectively, an exhaust gas recirculation passage connected at its outlet end to the intake chamber and at its inlet end to the second exhaust passage, second valve means provided in the recirculation passage for opening and closing the same, and control means responsive to engine load conditions for closing the first valve means to prohibit air flow to the second group of cylinders and opening the second valve means to allow recirculation of a portion of the exhaust gases discharged from the second group of cylinders when the engine is under low load conditions.</p> |
