七、基本喷射正时

The base injection timing is calculated directly from the load signal and from the injector constants，and defines the relationship between the duration of the activation signal and the flow quantity at the injector.This constant thus varies according to injector design.When the injection duration is multiplied by the injector constant the result will be a fuel mass corresponding to a particular air mass for each stroke.

The base setting is selected for an excess-air factor ofλ=1.

This remains valid for as long as the pressure differential between fuel and intake manifold stays constant.When it varies，aλcorrection map compensates for this influence on injection times.

Meanwhile，a battery-voltage corrector compensates for the effects that fluctuations in battery voltage have on the injectors’opening and closing times.

【译文】

根据负荷信号和喷油器的喷射常量直接计算基本喷射时间，确定触发信号持续时间和喷油器流量间的关系。因此，该常量会根据喷油器的设计而发生变化。喷射持续时间×喷油器常量=每行程吸入空气量的燃油量。

基本设置被选择为过量空气系数λ=1。

只要燃油和进气歧管之间的压力差保持不变，λ=1就是有效的。当压力差变化时，λ修正脉谱图即对喷射时间进行补偿。

同时，蓄电池电压修正对喷油器开、关时产生的蓄电池电压的波动进行补偿。