Detection of a specific faulted DOD electrohydraulic circuit

Details Detection of a specific faulted DOD electrohydraulic circuit Detection of a specific faulted DOD electrohydraulic circuit

2007-12-04

2007-12-04

Chang, Ching (Department: 3748)

Internal-combustion engines

Poppet valve operating mechanism

Hydraulic system

C123S090150

Reexamination Certificate

active

11195856

ABSTRACT:
A fault detection system for detecting a fault in a lifter oil manifold assembly (LOMA) of a displacement on demand engine that is operable during transition from activated and deactivated modes includes a first fluid circuit of the LOMA that selectively provides pressurized fluid to regulate operation of the engine between activated and deactivated modes. The fault detection system further includes a sensor that is responsive to fluid pressure of the LOMA and that generates a pressure signal based thereon. A control module outputs a control signal to switch operation of the engine between the activated and deactivated modes. The control module further determines a pressure differential based on a first pressure prior to switching between the modes and a second pressure after switching between the modes.

REFERENCES:
patent: 7086374 (2006-08-01), McDonald et al.
patent: 2002/0189575 (2002-12-01), Rayl et al.

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