Liquid-injecting device

摘要

An impulsive fuel injection device suited for a high speed engine comprises an electrostrictive or magnetostrictive element (51). An ECU (4) acts as energy supply controlling means for controlling energy supplied to said electrostrictive or magnetostrictive elements. The electric energy has a stepped form, to thereby cause said electrostrictive element (51) to expand in a very short time so as to generate an impulsive high pressure wave (shock wave). The ECU (4) controls said energy supply in response to engine parameters such that at least one of the rate of increase, the peak value, and the rate of decrease of said electric energy is changed for a larger or lower load, whereby the magnitude of said shock wave can be varied. <IMAGE>