Method of testing fuel injection equipment

Patent metadata

Field	Value
Publication number	US-11149704-B2
Application number	US-201716303559-A
Country	US
Kind code	B2
Filing date	May 22, 2017
Priority date	May 24, 2016
Publication date	Oct 19, 2021
Grant date	Oct 19, 2021

Abstract

A method of testing a fuel injection system or components thereof includes running a high pressure fuel pump to provide fluid under pressure to the fuel injection system or components. The pump flow is controlled via an inlet metering valve by controlling current or voltage supplied to the inlet metering valve dependent on the power to the fuel pump.

First claim

The invention claimed is:

1. A method of testing a fuel injection system or components thereof, the method comprising:
running a high pressure fuel pump to provide fluid under pressure to the fuel injection system or the components;
controlling pump flow of the high pressure fuel pump with an inlet metering valve; and
controlling current or voltage supplied to the inlet metering valve based on power to the high pressure fuel pump.

2. The method as claimed in claim 1 , where the high pressure fuel pump is driven by an electrical motor and the power is determined from the voltage across and/or current through the electrical motor.

3. The method as claimed in claim 1 , wherein the current or the voltage is controlled solely to be dependent on the power.

4. The method as claimed in claim 1 , wherein the components are one or more fuel injectors.

5. The method as claimed in claim 4 , wherein the one or more fuel injectors are supplied via a common rail fluidly located between the high pressure fuel pump and the one or more fuel injectors.

6. The method as claimed in claim 5 , wherein the common rail includes a pressure control valve.

7. The method as claimed in claim 1 , wherein the power to the high pressure fuel pump is kept above a minimum threshold level or below a maximum threshold level.

8. The method as claimed in claim 1 , wherein said controlling current or voltage supplied to the inlet metering valve based on power to the high pressure fuel pump is performed while said high-pressure fuel pump is running.

9. The method as claimed in claim 2 , where the high pressure fuel pump is driven by an electrical motor and the power is determined from the voltage across and/or current through the electrical motor while the electric motor is running.

10. A method of testing a fuel injection system or components thereof, the method comprising:
running a high pressure fuel pump to provide fluid under pressure to the fuel injection system or the components;
controlling pump flow of the high pressure fuel pump with an inlet metering valve; and
controlling current or voltage supplied to the inlet metering valve based on power to the high pressure fuel pump;
wherein controlling the current or the voltage supplied to the inlet metering valve comprises incrementing the current or the voltage based on whether the current or the voltage or power is below or above a minimum threshold or a maximum threshold respectively.

11. The method as claimed in claim 10 wherein, the incrementing is variable and based on a rail pressure.

Assignees

• Delphi Tech Ip Ltd

Inventors

• Walsh Aaron
• Jacobs Lee Raymond

Classifications

• F02D41/22 Primary

  Safety or indicating devices for abnormal conditions {(in air/fuel ratio feedback systems F02D41/1495, in electric control linkage F02D11/107, in purge control systems F02M25/0809)} · CPC title

• F02D41/3845

  by controlling the flow into the common rail, e.g. the amount of fuel pumped · CPC title

• F02D41/3082

  Control of electrical fuel pumps · CPC title

• F02D2041/224

  Diagnosis of the fuel system · CPC title

• F02M65/00

  Testing fuel-injection apparatus, e.g. testing injection timing {(testing of ignition F02P17/00; measuring fuel consumption G01F9/00); Cleaning of fuel-injection apparatus} · CPC title