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.
Claims12
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 second voltage with a peak current;
- a low-voltage detector detecting whether a measured voltage measured at an upstream end of the driving coil falls to less than a threshold voltage;
- and
- a high-voltage applicator configured to apply the second voltage to the driving coil that is higher than the first voltage when the measured voltage falls to less than the threshold voltage.
A control system comprising:
- a processor;
- and
- a computer-readable storage medium including instructions that, when executed, cause the following:
- turn ON a selection switch connected to a downstream side terminal;
- turn ON a discharge switch connecting a boosted voltage to an upstream side terminal to generate an applied voltage across the terminals, such that the applied voltage equals the boosted voltage;
- measure a current from a downstream side terminal;
- upon a determination that the current is greater than or equal to a peak threshold current, turn OFF the discharge switch;
- wherein a first control range ranges from a first lower limit to a first higher limit;
- upon a determination that the current falls to less than or equal to the first lower limit, turn ON a constant current switch connecting a power supply voltage to the upstream side terminal;
- upon a determination that the applied voltage falls to less than a threshold voltage, turn ON the discharge switch connecting the boosted voltage to the upstream side terminal;
- upon a determination that the current is greater than or equal to the first higher limit, turn OFF the discharge switch and turn OFF the constant current switch.
Dependencies are inferred from the claim text.