Diagnostic systems and methods for variable lift mechanisms of engine systems having a camshaft driven fuel pump
AssigneeGM Global Technology Operations LLC
InventorsKenneth J. Cinpinski, Donovan L. Dibble
Life of this patent
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Abstract
A lift mechanism diagnostic system comprises a fuel pump disabling module, a pressure module, and a diagnostic module. The fuel pump disabling module selectively disables a fuel pump that is driven by a camshaft. The pressure module determines a first pressure of fluid provided to a variable valve lift mechanism when the variable valve lift mechanism is operated in a first lift mode while the fuel pump is disabled and determines a second pressure of the fluid when the variable valve lift mechanism is operated in a second lift mode while the fuel pump is disabled. The diagnostic module selectively diagnoses a fault in the variable valve lift mechanism based on the first and second pressures.
Claims20
A lift mechanism diagnostic system comprising:
- a fuel pump disabling module that selectively disables a fuel pump that is driven by a camshaft;
- a pressure module that determines a first pressure of fluid provided to a variable valve lift mechanism when said variable valve lift mechanism is operated in a first lift mode while said fuel pump is disabled and that determines a second pressure of said fluid when said variable valve lift mechanism is operated in a second lift mode while said fuel pump is disabled;
- and
- a diagnostic module that selectively diagnoses a fault in said variable valve lift mechanism based on said first and second pressures.
A lift mechanism diagnostic method comprising:
- selectively disabling a fuel pump that is driven by a camshaft;
- determining a first pressure of fluid provided to a variable valve lift mechanism when said variable valve lift mechanism is operated in a first lift mode while said fuel pump is disabled;
- determining a second pressure of said fluid when said variable valve lift mechanism is operated in a second lift mode while said fuel pump is disabled;
- and
- selectively diagnosing a fault in said variable valve lift mechanism based on said first and second pressures.
Dependencies are inferred from the claim text.