| 摘要 |
A method for combusting fuel in an engine involving decreasing a first volume of air to a third volume, in two stages, the first stage in a crankcase compressor decreasing a first volume of air to a second volume and a second stage in the engine cylinder decreasing a second volume of a gas to a third volume, injection of fuel between the two stages into partially compressed hot air to provide homogenous charge to the cylinder to begin second stage compression in the cylinder having two variable compression ratios, a first variable compression ratio for low loads to reach a compression temperature slightly below the autoignition temperature of the homogeneous charge such that spark ignited HCCI-like combustion being emission free, a second much smaller variable compression ratio for preventing pre-ignition at high loads, then increasing the pressure at constant volume via combusting homogeneous charge in the cylinder, increasing the third volume of gas to a fourth volume (an expansion process having a chosen expansion ratio much greater than the compression ratio), decreasing the pressure to atmospheric pressure while removing heat under constant volume, and finally decreasing the volume of gas to the first volume while removing heat under constant pressure to complete a two-stroke homogeneous charge spark-ignition cycle. Also disclosed is an engine employing the two-stroke HCSI cycle.
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