DRIVE SYSTEM AND DRIVE METHOD FOR FUEL INJECTION VALVES

摘要

A drive system for fuel injection valves includes a battery, a capacitor, a drive control unit and an electronic control unit. The electronic control unit is configured to, when an energization start interval between a start of energization of a last one of the fuel injection valves and a start of energization of a current one of the fuel injection valves is longer than or equal to a peak reaching time of a last one of the fuel injection valves, extend an energization time of the current one of the fuel injection valves as the energization start interval reduces. The electronic control unit is configured to, when the energization start interval is shorter than the peak reaching time, reduce the energization time of the current one of the fuel injection valves is energized as the energization start interval reduces.

主权项

1: A drive system for fuel injection valves, comprising:
a battery; a capacitor configured to be charged with electric power that is supplied from the battery; a drive control unit configured to selectively use one of the battery and the capacitor as a power supply, and to open or close a plurality of fuel injection valves by controlling energization of the plurality of fuel injection valves from one of the battery and the capacitor; and an electronic control unit configured to: (a) cause the plurality of fuel injection valves to inject fuel by energizing the plurality of fuel injection valves through control over the drive control unit, (b) when an energization start interval between a start of energization of a last one of the fuel injection valves, of which energization is started first, and a start of energization of a current one of the fuel injection valves, of which energization is started subsequently, is longer than or equal to a peak reaching time of a last one of the fuel injection valves at the time when fuel is sequentially injected from the plurality of fuel injection valves, extend an energization time of the current one of the fuel injection valves as the energization start interval reduces, the peak reaching time being a time interval between first energization start timing and peak reach timing, the first energization start timing being timing of the start of energization of the last one of the fuel injection valves, and the peak reach timing being timing at which exciting current flowing through a solenoid of the last one of the fuel injection valves reaches a peak current value that is set at the time of fuel injection of the last one of the fuel injection valves, the energization start interval being a time interval between the first energization start timing and second energization start timing that is timing of the start of energization of the current one of the fuel injection valves, and (c) when the energization start interval is shorter than the peak reaching time, reduce the energization time of the current one of the fuel injection valves as the energization start interval reduces.