| 摘要 |
PCT No. PCT/GB96/02840 Sec. 371 Date May 28, 1998 Sec. 102(e) Date May 28, 1998 PCT Filed Nov. 19, 1996 PCT Pub. No. WO97/20133 PCT Pub. Date Jun. 5, 1997A stratified charge internal combustion engine comprises at least one cylinder having at least one intake valve 14 per cylinder, and two manifolds 24, 34 having branches 22, 32 supplying first and second gas streams to at least one intake valve of each cylinder. The two streams enter the cylinder separately through different regions of the valve 14 so as to produce a stratified charge within the engine cylinder. The first manifold 24 supplies a stream comprising air within which fuel to be burnt is dispersed and the second manifold 34 supplies a stream comprising dilution gases. Each of the two manifolds 24, 34 has a plenum chamber and the plenum chambers of the two manifolds are connected to a common air supply throttle 50. The plenum chamber 34 of the second manifold is additionally connected to an exhaust gases recirculation (EGR) pipe 84 from the exhaust system of the engine through an EGR throttle 54 of similar design to and mechanically ganged with the air supply throttle 50. The EGR pipe 84 supplies exhaust gases directly into the second stream to form part of the gases in the second stream. The relative quantity of air in the first stream supplied by the first manifold 24 as a fraction of the total quantity of air supplied to the two manifolds 24, 34 is variable and determined by the setting of the relative quantity of EGR flow as a fraction of the total air flow. |
