| 摘要 |
PCT No. PCT/GB94/00184 Sec. 371 Date Oct. 13, 1995 Sec. 102(e) Date Oct. 13, 1995 PCT Filed Jan. 31, 1994 PCT Pub. No. WO94/18456 PCT Pub. Date Aug. 18, 1994A three-mode control system for controlling the flow of inlet air into a supercharged spark ignition engine comprising an air expansion and compression apparatus, an inlet manifold, and an inlet port control valve for controlling the intake of air into the expansion and compression apparatus. The inlet port control includes an inlet port valve which is open at full engine load and progressively closes when the engine load is progressively reduced while the inlet manifold pressure remains above a predetermined level. An air flow throttle valve located upstream of the expansion and compression apparatus is open at full engine load and progressively closes when the engine load is progressively reduced and the inlet manifold pressure falls below the predetermined level. A bypass duct which can optionally bypass air around the expansion and compression apparatus is closed at full engine load and progressively opens when the engine load is reduced and the inlet manifold pressure falls below the predetermined level. The air supply to the engine may be throttled by the throttle valve before it passes to the engine via the expansion and compression apparatus or it may pass through the bypass duct. |
