Measuring and testing – Simulating operating condition – Marine
Patent
1996-11-13
1998-02-24
Dombroske, George M.
Measuring and testing
Simulating operating condition
Marine
36443103, G01M 1500
Patent
active
057213755
ABSTRACT:
A method and apparatus is provided for determining if the valve deactivator on a variable displacement internal combustion engine is functioning properly. The occurrence of an asymmetry in one of the cylinder banks when making fuel mass calculations during the fractional mode (four cylinders) and the presence of substantial symmetry in fuel mass calculations during maximum mode (eight cylinders) of engine operation indicates a possible deterioration of the valve deactivator. Also, if the ratio of the difference between the expected MAP and the actual MAP during fractional cylinder mode and maximum cylinder mode exceed a calibratable value possible valve deactivator deterioration is also indicated. In a preferred embodiment, these two monitoring methods are combined to provide a more robust indicator, so that if both indicate a possible problem, then an indicator lamp is illuminated to signal that service personnel should check whether the valve activators are properly functioning.
REFERENCES:
patent: 4782690 (1988-11-01), Terasaka
patent: 5331936 (1994-07-01), Messih et al.
patent: 5408966 (1995-04-01), Lipinski et al.
patent: 5503129 (1996-04-01), Robichaux et al.
Dombroske George M.
Drouillard Jerome R.
Ford Global Technologies Inc.
May Roger L.
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