초록 ▼

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

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.

대표청구항 ▼

[ What is claimed is:] [1.] A method of compression pressure determination in a combustion chamber of a cylinder in a running engine, said method comprising the steps of:measuring acceleration of a crankshaft of said running engine, said measurement centered proximate a maximum rate of compression o

[ What is claimed is:] [1.] A method of compression pressure determination in a combustion chamber of a cylinder in a running engine, said method comprising the steps of:measuring acceleration of a crankshaft of said running engine, said measurement centered proximate a maximum rate of compression of said cylinder, and providing a first acceleration variable responsive thereto; andproviding a compression pressure variable having a magnitude indicative of a compression pressure in the combustion chamber of the cylinder in said running engine determined dependent on an amplitude of the measured first acceleration variable.