| 摘要 |
A valve assembly for use in internal combustion engine applications, of the type designed to regulate air-fuel mixture from a carburetor or other fuel injection means entering the cylinders of either two stroke cycle or four stroke cycle spark ignition engines to improve the part-load and full-load fuel efficiency of such engines by minimizing the pumping losses. This increase in efficiency is accomplished by regulating engine power output by employing time-duration-modulation control instead of the throttled or resistive intake control which is empolyed in the engines of the prior art. A rotary valve structure employs a tubular multi-port member comprising a rotary valve, with an outlet for each cylinder, operating at 15 p.s.i. maximum differential pressure and relatively low temperatures, connected in series with presently used poppet or reed or port type intake valves. Rotary valve timing or phase control is accomplished with a multi-pulley belt drive system. The time-duration-control limits engine output by matching the effective compression ratio to that ratio required to meet the demand placed on the engine in less than full load conditions. An adjustable full load stop prevents the engine from reaching its full load output, thereby allowing the effective compression ratio to be affected by the inventive valve structure throughout the entire range of engine opertion. Since the novel valve assembly allows unlimited reduction of the effective compression ratio, the engine manufacturer may reduce clearance volumes and hence increase the engine expansion ratio independently of any effect on the effective compression ratio of the engine.
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