Measuring and testing – Vehicle drive train – Rear end
Patent
1993-08-02
1999-06-22
Chilcot, Richard
Measuring and testing
Vehicle drive train
Rear end
731173, 701110, G01M 1500
Patent
active
059152729
ABSTRACT:
A method of detecting low compression pressure by interpreting acceleration of an engine crankshaft (201) is detailed. In a preferred embodiment, the method teaches measurement of intake manifold pressure. Then, a first engine crankshaft acceleration is measured, preferably proximate a maximum rate of compression, for a cylinder (113), and a first variable (307) indicative of the first engine crankshaft acceleration is provided. Then, a second engine crankshaft acceleration is measured, preferably proximate the cylinder's top-dead-center position (105), and a second variable (311) indicative of the second engine crankshaft acceleration is provided. Then, the method combines (313) the intake manifold pressure, the first variable, and the second variable and provides a compression pressure variable as a function of the combined variables. Other embodiments include subsets of the above variables to provide a compression pressure variable as a function of the combined variables. In all of the embodiments, a low compression pressure may be indicated (317) when the compression pressure variable does not exceed a predetermined limit for the associated cylinder. An apparatus is also detailed in support of the preferred method.
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Foley John F.
Plee Steven L.
Remboski, Jr. Donald J.
Chilcot Richard
Hopman Nicholas C.
McCall Eric S.
Motorola Inc.
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