US 2020/0080507 A1Published application

Fuel injection control device

AssigneeDenso Corporation

InventorKazuya KOGO

Life of this patent

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Abstract

A fuel injection control device first causes a first power supply unit to apply a voltage to a fuel injection valve, subsequently causes a second power supply unit to apply a voltage to the fuel injection valve, and after the first power supply unit applies the voltage, executes a lift position determination process to determine that a valve element of the fuel injection valve reaches a predetermined lift position based on a change in a drive current. A first control unit performs a drive control on the fuel injection valve without executing the lift position determination process. A second control unit executes the lift position determination process and performs a drive control on the fuel injection valve. The second control unit controls the drive current to decrease when the valve element reaches the predetermined lift position compared to a case where the first control unit performs drive control.

Claims10

Dependent claims

A fuel injection control device for a fuel injection system including a first power supply unit, a second power supply unit configured to apply a power supply voltage lower than that of the first power supply unit, a fuel injection valve configured to be driven by power supplied from each of the first power supply unit and the second power supply unit, and a current detection unit configured to detect a drive current for the fuel injection valve,

the fuel injection control device configured first to cause the first power supply unit to apply a voltage to the fuel injection valve, subsequently to cause the second power supply unit to apply a voltage to the fuel injection valve, and to execute a lift position determination process after the first power supply unit applies the voltage to determine that a valve element of the fuel injection valve reaches a predetermined lift position based on a change in the drive current detected by the current detection unit, when driving the fuel injection valve,
the fuel injection control device comprising:
a first control unit configured to perform a drive control on the fuel injection valve without executing the lift position determination process;
and
a second control unit configured to execute the lift position determination process to perform a drive control on the fuel injection valve, wherein
the second control unit is configured to control the drive current for the fuel injection valve such that the drive current when the valve element reaches the predetermined lift position decreases compared to a case where the first control unit performs the drive control.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application: 16/681,999Filed 13 Nov 2019
Priority: JP 2017-09975219 May 2017
Published: 12 Mar 2020
Term ends: Not estimatedThe source records don’t support an estimate.

Classification12 codes

F02D 41/20
Electrical control of supply of combustible mixture or its constituents: output circuits, e.g. for controlling currents in command coils
F02D 41/345
With means for controlling injection timing or duration: controlling injection timing
F02M 51/06
Fuel-injection apparatus characterised by being operated electrically: injectors peculiar thereto with means directly operating the valve needle
F02P 5/145
Automatically, as a function of the working conditions of the engine or vehicle or of the atmospheric conditions: using electrical means