Injector control device
Provided is an injector control device which is capable of setting a preceding injection amount to a fuel injection amount that is less than a main injection amount, while suppressing situations where preceding injections executed prior to a main injection in multi-stage injection are eliminated. An injector control device 2 includes: an injection amount setting unit 211 that sets, as a total injection amount, a total of fuel injection amounts in multi-stage injection in a single cycle, and sets, as a preceding injection amount, a fuel injection amount in a preceding injection executed prior to a main injection in the multi-stage injection; an energization period setting unit 212 that sets an energization period of an injector 31 based on the fuel injection amounts set by the injection amount setting unit 211 ; and an injector driving unit 213 that controls driving of the injector 31 based on the energization period set by the energization period setting unit 212 . The injection amount setting unit 211 sets a fuel injection amount that is a predetermined percentage of the total injection amount as the preceding injection amount.
1. An injector control device that controls driving of an injector that performs multi-stage injection in which fuel injection is divided into a plurality of injections in a single cycle of an engine, the injector control device comprising:
an injection amount setting unit that sets, as a total injection amount, a total of fuel injection amounts in the multi-stage injection in the single cycle, and sets, as a preceding injection amount, a fuel injection amount in a preceding injection executed prior to a main injection in the multi-stage injection;
an energization period setting unit that sets an energization period of the injector based on the total injection amount and the preceding injection amount set by the injection amount setting unit;
an injector driving unit that controls driving of the injector based on the energization period set by the energization period setting unit, and
a minute injection amount region determination unit that determines whether the total injection amount is within a minute injection amount region,
wherein the injection amount setting unit executes control such that an engine speed of the engine is in proportion to the load on the engine, in the control that if the engine speed drops the injection amount setting unit executes control for increasing the total injection amount and if the engine speed rises the injection amount setting unit executes control for reducing the total injection amount, sets the total injection amount for keeping the engine speed constant, and sets a fuel injection amount that is a predetermined percentage of the total injection amount as the preceding injection amount when the minute injection amount region determination unit determines that the total injection amount is within the minute injection amount region based on the total injection amount being less than or equal to a first predetermined fuel injection amount,
the predetermined percentage is a ratio of the preceding injection amount to the total injection amount when the preceding injection amount is less than or equal to the fuel injection amount in the main injection, and
the first predetermined fuel injection amount is the total injection amount when the fuel injection amount of the predetermined percentage of the total injection amount is less than or equal to a guaranteed minimum injection amount of the injector.
2. The injector control device according to claim 1 ,
wherein when the minute injection amount region determination unit determines that the total injection amount is not within the minute injection amount region, the injection amount setting unit sets, as the preceding injection amount, a predetermined fuel injection amount set in advance.
3. The injector control device according to claim 1 ,
the control such that the engine speed of the engine is in proportion to the load on the engine is one of a governor control and an idle speed control.
4. The injector control device according to claim 3 ,
the governor control is a control that sets the total injection amount using the governor map based on the engine speed and an accelerator position of the engine.
5. The injector control device according to claim 3 ,
the idle speed control is a feedback control that sets the engine speed to a predetermined value based on the engine speed and an accelerator position of the engine.