Electronic control device
Provided is an electronic control device capable of always achieving a desired injector injection amount by preventing a change in injector opening time regardless of a change (a decrease) of a power supply voltage for opening a valve of an injector. A precharge current amount at the time of precharge control is changed in a stepwise manner based on a voltage of the injector valve open power supply device 10 at the time of the precharge control.
1. An electronic control device powered by a voltage that supplies, to a fuel injection valve, a current for opening the fuel injection valve based on the voltage, comprising a precharge control configured to supply a precharge current to the fuel injection valve before the current supply is performed,
wherein a precharge current amount is based on the voltage; and
wherein
when the voltage is equal to or more than a predetermined precharge preventing threshold value, the precharge control is prevented.
2. The electronic control device according to claim 1 , further comprising:
a comparator having a plurality of predetermined comparison voltage values, wherein the precharge current amount is based on a comparison of said plurality of predetermined comparison voltage values and the voltage and a set value of the precharge current amount is selected from a plurality of set values of predetermined precharge current amount and corresponding to the comparison voltage value.
3. The electronic control device according to claim 2 , wherein
the plurality of comparison voltage values can be set individually.
4. The electronic control device according to claim 2 , wherein
the plurality of set values of the precharge current amount can be set individually.
5. The electronic control device according to claim 1 , wherein
the precharge preventing threshold value may be set as a variable.
6. An electronic control device powered by a voltage that supplies, to a fuel injection valve, a current for opening the fuel injection valve based on the voltage comprising a precharge control configured to supply a precharge current to the fuel injection valve before the current supply is performed,
wherein
a valve open detection current amount when the fuel injection valve is detected to be opened is held, and
in a next and subsequent precharge control, precharge control at a precharge current amount equal to or larger than the valve open detection current amount is prevented.
7. An electronic control device powered by a voltage that supplies, to a fuel injection valve, a current for opening the fuel injection valve based on the voltage comprising a precharge control configured to supply a precharge current to the fuel injection valve before the current supply is performed,
wherein
when the fuel injection valve is detected to be opened by the precharge control, a precharge current amount when the valve is opened is held, and in a next and subsequent precharge control, precharge control at a precharge current amount equal to or larger than the precharge current amount when the valve is opened is prevented.