| 摘要 |
PURPOSE: To reduce the size of a system and to simplify an oil pressure passage by providing a first piezoelement to change a pressure in a pressure chamber through expansion and contraction, a second piezoelement to change a pressure in a fuel chamber through expansion and contraction, and injecting air-fuel mixture in a combustion chamber through control of energization to each of the piezoelements. CONSTITUTION: When a pressure in a combustion chamber 25 is lower than a pressure in a mixing chamber 20, with a voltage being applied on a first piezoelement 21 and the element 21 being expanded, pressure in a pressure chamber 33 is pressurized and the valve body of a moving body 24 is opened, and fuel is injected in the combustion chamber 25 through an injection nozzle 16. A pressure in the mixing chamber 20 and a pressure in the combustion chamber 25 are made approximately equal to each other. When a pressure in the mixing chamber 20 attains a given pressure, gas in the combustion chamber 25 is charged in the mixing chamber 20. In which case, when a voltage is applied on a second piezoelement 22 and the element 22 is expanded, fuel in a fuel chamber 17 is compressed. When a pressure in the fuel chamber 17 is increased to a value higher than the opening pressure of a check valve 19, the check valve 19 is opened and fuel is fed in the mixing chamber 20. |
