Injection controller
AssigneeDenso Corporation
InventorToshio NISHIMURA
Life of this patent
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Abstract
An injection controller has a voltage applicator that applies a voltage to a driving coil of an injection valve. After a voltage is applied to the driving coil with a peak current for opening the injection valve, the voltage applicator applies a power supply voltage to the driving coil in an ON-OFF manner, to supply the driving coil with a less-than-peak current. A comparator detects whether a terminal voltage at a terminal of the coil is less than a predetermined threshold voltage. Upon detecting that the terminal voltage is less than the threshold voltage, a discharge switch applies a boosted voltage to the driving coil.
Claims9
An injection controller comprising:
- a voltage applicator configured to switch a first voltage on and off for an application of the first voltage to a driving coil to supply a less-than-peak current to an injection valve after the injection valve is opened by a voltage with a peak current;
- a low-voltage detector detecting whether a voltage corresponding to an application voltage applied to the driving coil by the voltage applicator is less than a threshold voltage;
- and
- a high-voltage applicator configured to apply a second voltage to the driving coil that is higher than the first voltage when the voltage corresponding to the application voltage applied to the driving coil and detected by the low-voltage detector is less than the threshold voltage.
Dependencies are inferred from the claim text.