| 摘要 |
<p>A fuel injection system for a spark-ignition internal combustion engine in which combustion air is fed through an air flow meter to produce a signal force (SF) whose strength is proportional to the mass-volume of the air. This signal force (SF) actuates the valve member (12) of a valve mechanism to whose input is supplied fuel at constant pressure, the valve member (12) being displaced to an extent determined by the strength of the signal force (SF). The valve mechanism includes a fuel output chamber (16) in which the pressure of fuel therein is a function of valve member displacement, this pressure being applied as a countervailling force to the valve member (12) to cause it to assume a null-balance position at which the resultant mean fuel pressure yielded by the output chamber (16) is proportional to the mass-volume of the combustion air, thereby attaining optimum fuel-air ratio conditions throughout a broad operating range. The valve mechanism is applicable to fluid powered positioning and motion devices from electric command and control signals.</p> |
