US 12,146,451 B2 · Methods for measuring fuel quantity during multipulse fuel injection events in a common rail fuel system

Abstract

Various embodiments of the present disclosure relate to methods and systems for measuring an injected fuel quantity during multipulse injection events in a common rail of a fuel system including a fuel pump to supply fuel to the common rail. The method, using a control unit, determines if each of the multipulse injection events in a normal operating condition includes a pilot pulse; in response to determining that the pilot pulse is included, obtaining an enforced separation value between the pilot pulse and the main pulse to emulate a single-pulse injection; while the fuel pump is temporarily shut off, performing a temporary enforced separation on a fraction of the multipulse injection events; measuring a pressure change in the common rail during the temporary enforced separation; and resuming the normal operating condition of the multipulse injection events after the pressure change is measured.

Claims20

Dependent claims

A method of measuring an injected fuel quantity during operation of a common rail fuel system including a control unit configured to control a fuel pump to supply fuel to a common rail and to control one or more injectors to inject fuel from the common rail, the method comprising:

operating the one or more injectors according to normal multipulse injection parameters including a normal pilot-pulse to main-pulse separation;
with the fuel pump shut off, operating the one or more injectors according to modified multipulse injection parameters including a modified pilot-pulse to main-pulse separation, the modified pilot-pulse to main-pulse separation being greater than the normal pilot-pulse to main-pulse separation;
sensing a pressure drop of the common rail fuel system during the operating the one or more injectors according to the modified multipulse injection parameters;
and
after the sensing operating the one or more injectors according to the normal multipulse injection parameters.

2 more elements

A system comprising:

a fuel pump;
a common rail fluidly coupled with the fuel pump and configured to receive fuel from the fuel pump;
one or more fuel injectors fluidly coupled with the common rail and configured to inject the fuel supplied to the common rail by the fuel pump;
an electronic control system operatively coupled with and configured to control operation of the one or more fuel injectors and the fuel pump, the electronic control system being configured to:
operate the one or more injectors according to normal multipulse injection parameters including a normal pilot-pulse to main-pulse separation;
with the fuel pump shut off, operate the one or more injectors according to modified multipulse injection parameters including a modified pilot-pulse to main-pulse separation, the modified pilot-pulse to main-pulse separation being greater than the normal pilot-pulse to main-pulse separation;
sense a pressure drop of the common rail fuel system during the operating the one or more injectors according to the modified multipulse injection parameters;
and
after the pressure drop is sensed, operate the one or more injectors according to the normal multipulse injection parameters.

6 more elements

Dependencies are inferred from the claim text.

Methods for measuring fuel quantity during multipulse fuel injection events in a common rail fuel system

Life of this patent

Methods for measuring fuel quantity during multipulse fuel injection events in a common rail fuel system

Life of this patent

Abstract

Claims20