US 2021/0189987 A1Published application

Injection control device

AssigneeDenso Corporation

InventorsHIROAKI SHIRAKAWA, MASASHI INABA

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Abstract

An injection control device includes a boost controller performing boost control of a boosted voltage generated by a booster circuit until a boosted voltage, which is generated in a boost capacitor, rises to a full-charge threshold when the boosted voltage falls below a charge start threshold. When, for stopping a peak current by a drive unit, a power interruption controller interrupts electric current supplied to the fuel injection valve by the drive unit as interruption control (i) of an application voltage to a fuel injection valve or (ii) of a constant current by the drive unit, a regeneration unit regenerates electric current generated in the fuel injection valve to the boost capacitor of the booster circuit. The boost controller upward-shifts (i.e., raises) the full-charge threshold of the booster circuit.

Claims14

Dependent claims

An injection control device for controlling injection by supplying electric current to a fuel injection valve, the boost control device comprising:

a booster circuit boosting a battery voltage to generate a boosted voltage in a boost capacitor;
a boost controller performing boost control by the booster circuit until the boosted voltage rises to a full-charge threshold when the boosted voltage falls below a charge start threshold;
a drive unit supplying electric current to a fuel injection valve with the boosted voltage or the battery voltage;
a power interruption controller interrupting electric current supplied by the drive unit to the fuel injection valve;
and
a regeneration unit regenerating electric current generated in the fuel injection valve to the boost capacitor of the booster circuit, generation of the electric current caused by interruption control of the power interruption controller, wherein
the boost controller upward-shifts a full-charge threshold of the booster circuit in a period of when at least the electric current is regenerated by the regeneration unit to the boost capacitor of the booster circuit after the power interruption controller interrupts the electric current.

4 more elements

An injection control device comprising:

a control circuit;
a booster circuit configured to generate a boost voltage, and including:
a boost inductor, a boost switch, a boost resister, a boost diode, and a boost capacitor;
a regenerative circuit configured to pass a regenerative current towards the booster circuit;
a discharge switch located electrically between the booster circuit and a fuel injection valve;
a constant current switch located electrically between a battery voltage and the fuel injection valve;
a high side terminal configured for connection to a fuel injection valve;
a low side terminal configured for connection to a low side of the fuel injection valve, and associated with a low-side voltage;
a low-side drive switch;
and
a current detection resistor configured to receive current from the low-side drive switch,
wherein the control circuit is configured to:
start charging the boost capacitor by switching the boost switch when the boost voltage is equal to or smaller than a predetermined charge start threshold;
stop charging the boost capacitor by switching the boost switch when the boost voltage is equal to or greater than a full-charge threshold;
wherein the full charge threshold has a shifted value during a shift period, and has a non-shifted value outside of the shift period;
and
wherein the shifted value is greater than the non-shifted value.

14 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/126,484Filed 18 Dec 2020
Priority: JP 2019-23150523 Dec 2019
Published: 24 Jun 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

F02D 41/20
Electrical control of supply of combustible mixture or its constituents: output circuits, e.g. for controlling currents in command coils
F02M 51/061
Injectors peculiar thereto with means directly operating the valve needle: using electromagnetic operating means
F02D 2041/2006
Using means for creating a boost voltage, i.e. generation or use of a voltage higher than the battery voltage, e.g. to speed up injector opening:…
F02D 2041/202
Output circuits, e.g. for controlling currents in command coils: characterised by the control of the circuit