| 摘要 |
A combustible fuel vapor/steam mixture is fed to a piston engine through an injection valve (12). The mixture is generated by feeding water through a water pump (5) and magnetic valve into a vaporizer (1) which makes superheated steam and feeding liquid fuel through a fuel pump (4) and magnetic valve for injection into the superheated steam. The resulting mixture can be finely adjusted by an electronic control (32) which regulates the pumps and valves. The injection valve (12) injects the mixture into pre-compressed combustion air in the cylinder, and the electronic control adjusts the injection period according to the desired engine power and speed. Preferably, the injection valve closes as soon as compression pressure equals vapor mixture pressure, but the injection period is varied by changing the opening instant of the valve. The valve opens at crank angle GAMMAa and closes at angle GAMMAz. As engine speed increases, injection time is held constant by setting opening angle GAMMAa earlier in the (shorter) cycle. Preferably, the injection valve is magnetically actuated by an armature (34) and coils (35 ) controlled by control device (32). The valve is heated by exhaust gas from the piston engine (14).
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