| 摘要 |
<p>Rail pressure control can be appropriately performed even if the discharge characteristics of a high-pressure pump vary according to the rotational frequency of the high-pressure pump. A common rail-type fuel injection control device configured in such a manner that a target rail pressure is obtained by driving and controlling an inflow amount-adjusting solenoid valve (24) by PID feedback control which corresponds to the difference between the actual rail pressure of a common rail (1) and the target rail pressure, and the inflow amount-adjusting solenoid valve (24) is provided so as to be able to adjust the amount of fuel flowing into a high-pressure pump (2) for supplying high-pressure fuel to the common rail (1). The PID constant in the PID control is selected according to the discharge amount of the high-pressure pump (2) to enable the PID control to follow a change in the discharge characteristics of the high-pressure pump (2). As a result, rail pressure control can be stably and highly reliably performed.</p> |
