| 摘要 |
<p>A fuel injection control device capable of calculating a fuel injection amount by detecting an intake air mass without using an aero-flowmeter, wherein a compression and exhaust time calculation part (3) calculates compression stroke start and end times (Tc1) and (Tc2) and exhaust stroke start and end times (Te1) and (Te2) based on the cycle of crank pulses generated by a crank angle sensor (2), an intake air mass calculation part (4) calculates an intake air mass by using an intake air mass∝[{(1/Tc1)2 - (1/Tc2)2} - {(1/Te1)2 - (1/Te2)2}], the calculated intake air mass is inputted into a fuel injection amount calculation part (5) to calculate the fuel injection amount for the intake air mass according to a target air/fuel ratio, and a fuel injection valve (1b) is driven at a duty determined according to the calculated fuel injection amount to feed a proper amount of fuel to an engine (1).</p> |
