FUEL PRESSURE CONTROL APPARATUS FOR AN INTERNAL COMBUSTION ENGINE

摘要

The engine ECU executes a program including the step (S320) of setting an upper limit guard value of a fuel pressure by executing low fuel pressure control in the case where a low fuel pressure control execution condition is satisfied with fulfillment of conditions that execution of the low fuel pressure control is permitted, that engine speed NE is lower than a threshold value, and that the atmospheric pressure is higher than a threshold value (YES in S310), and the step (S330) of controlling the fuel pressure to be a target fuel pressure within a range not exceeding the upper limit guard value. In the state where the engine load factor is greater than a threshold value, if rich determination is ON as the correction amount for decreasing the fuel injection amount in the high load region is greater than a threshold value, the low fuel pressure control is permitted.