Fuel pump control system and method
AssigneeGM Global Technology Operations LLC
InventorsKenneth J. Cinpinski, Byungho Lee
Life of this patent
Estimating the term…
Abstract
A control system includes a fuel pump control module and a diagnostic module. The fuel pump control module controls a fuel pump to provide fuel to a fuel rail. The diagnostic module controls the fuel pump control module to provide a predetermined amount of fuel to the fuel rail, determines an estimated pressure increase within the fuel rail based on the predetermined amount of fuel, and compares an actual pressure increase within the fuel rail to the estimated pressure increase. The fuel pump control module selectively controls the fuel pump based on the comparison.
Claims20
A control system comprising:
- a fuel pump control module that controls a fuel pump to provide fuel to a fuel rail;
- a fuel injection control module that selectively suspends fuel injection from the fuel rail based on vehicle operating conditions;
- and
- a diagnostic module that controls the fuel pump control module to provide a predetermined amount of fuel to the fuel rail when fuel injection from the fuel rail is suspended based on the vehicle operating conditions, that determines an estimated pressure increase within the fuel rail based on the predetermined amount of fuel, that compares an actual pressure increase within the fuel rail to the estimated pressure increase, and that selectively diagnoses a fault in the fuel pump based on the comparison.
A method comprising:
- selectively suspending fuel injection from a fuel rail based on vehicle operating conditions;
- controlling a fuel pump to provide a predetermined amount of fuel to the fuel rail when fuel injection from the fuel rail is suspended based on the vehicle operating conditions;
- determining an estimated pressure increase within the fuel rail based on the predetermined amount of fuel;
- comparing an actual pressure increase within the fuel rail to the estimated pressure increase;
- and
- selectively diagnosing a fault in the fuel pump based on the comparison.
Dependencies are inferred from the claim text.