| 摘要 |
<p>An improved misfire detection in automobile engines may include, in a first embodiment, an automobile engine (12) which has a pressure transducer (16) in its exhaust system (14), and misfires are identified by the pressure drop accompanying the misfire and the timing of the pressure drop relative to the cylinder identification signal. This may be accomplished digitally, sampling the pressure level at a rate of 1,000 cycles per second or more, and statistically analyzing the samples representing relative pressure. The sharp pressure drop and the range of pressures are important parameters in identifying the misfiring cylinder. A second embodiment of the present invention may include a simple, reliable, compact and inexpensive fluid pressure discontinuity analysis system which includes a basic capacitive pressure transducer (120), made of two closely spaced insulating plates whose opposed faces containing conductive layers, and one of the plates is a flexible diaphragm of low mechanical hysteresis.</p> |
