Denso Corporation

Tadashi Nonomura

Nobuhiko Shima

A common rail fuel injection system for controlling the opening area of the fuel metering valve inserted in the fuel supply passage for supplying the fuel to the fuel injection pump to control, to a target pressure, fuel pressure in the common rail which holds the fuel delivered from the fuel injection pump. In the steady-state operation, the solenoid current is controlled by duty control at control frequency preset with an importance placed on the control stability. After determining the transient of control from the amount of change in the target common rail pressure which is a target of control, the control frequency is changed to a lower low frequency for a specific time until the common rail pressure reaches the target pressure. As a result, the valve body moves fast, thereby gaining a high control response despite of unsteady behavior of the valve body of the metering valve.

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Kariya, Japan

Tadashi Nonomura