초록 ▼

An apparatus and corresponding method for detecting misfires of a motor vehicle internal combustion engine. The apparatus includes a speed sensor for generating a signal. Also, the apparatus includes a filter means for filtering noise-related events from said signal corresponding to sensed engine sp

An apparatus and corresponding method for detecting misfires of a motor vehicle internal combustion engine. The apparatus includes a speed sensor for generating a signal. Also, the apparatus includes a filter means for filtering noise-related events from said signal corresponding to sensed engine speed to thereby produce a filtered output signal. In addition, a pressure sensor for measuring average manifold absolute pressure over a cylinder firing event to set a misfire threshold change in engine speed value is shown. A comparison means for comparing said filtered output signal with said threshold change in engine speed value to detect an engine misfire condition for said cylinder firing event is also included.

대표청구항 ▼

[ What is claimed is:] [1.] An apparatus for detecting misfires of a motor vehicle internal combustion engine, comprising:a speed sensor for generating a crankshaft angular velocity signal a corresponding to sensed engine speed over a plurality of samples per cylinder firing event;filter means for f

[ What is claimed is:] [1.] An apparatus for detecting misfires of a motor vehicle internal combustion engine, comprising:a speed sensor for generating a crankshaft angular velocity signal a corresponding to sensed engine speed over a plurality of samples per cylinder firing event;filter means for filtering noise-related events from said signal corresponding to sensed engine speed to thereby produce a filtered output signal corresponding to crankshaft incremental velocity change at a band of frequencies centered around an engine firing frequency;a pressure sensor for measuring average manifold absolute pressure over a cylinder firing event that, in combination with engine speed, is used to select a programmed misfire threshold change in engine speed value; andcomparison means for comparing said filtered output signal with said threshold change in engine speed value, that determines the presence of engine misfire based upon a detection of multiple drops in engine speed during a cylinder firing event, and that determines which, if any, of the drops correspond to engine misfire conditions.