Fuel supply control device for internal combustion engine and fuel vapor processing method

摘要

The present invention relates to a fuel supply control device for an internal combustion engine and a fuel vapor processing method. In the fuel supply control device that calculates a manipulated variable of a fuel pump such that a fuel pressure detected by a fuel pressure sensor is brought close to a target fuel pressure, a determination whether a fuel vapor is generated is made based on a detection value of the fuel pressure and the manipulated variable in a fuel pump, or the determination is made based on an amplitude of the detection value of the fuel pressure and an average fuel pressure in a fuel supply piping. During the fuel vapor generation, the target fuel pressure is corrected to be a higher value to increase the fuel pressure, thereby compressing and removing the fuel vapor. Therefore, in a fuel supply system, the fuel vapor generation can be detected at low cost to suppress the fuel vapor generation.

主权项

1. A fuel supply control device for an internal combustion engine, which inputs an output signal of a fuel pressure sensor that detects a pressure of fuel discharged by a fuel pump and calculates a manipulated variable of the fuel pump such that the fuel pressure comes close to a target value to output the calculated the manipulated variable, comprising:
a unit that calculates a state quantity of the fuel pressure based on the output signal; and a unit that compares the state quantity and a threshold to determine whether a fuel vapor is generated and outputs a signal indicating whether the fuel vapor is generated.