| 摘要 |
<p>A system, and corresponding method, for detecting the presence of a misfire condition by interpreting spectral activity of a running engine includes a device (309, 313) for measuring a characteristic, preferably an acceleration characteristic indicative of the running engine's performance. A programmable filter (701) dependent on a determined engine speed (335) provides a filtered acceleration signal (703) responsive to an acceleration signal (317) provided by the acceleration measurement device (309, 313). A spectral discrimination device (319), preferably a digital filter, receives the filtered acceleration signal (703) provided by the programmable filter (701). The digital filter (319) provides a normal firing signal (321), corresponding to spectral energy attributable to a portion of the composite signal (317) representative of a normal firing condition in the running engine, and a misfire signal (323), corresponding to spectral energy attributable to another portion of the composite signal (317) representative of a misfiring condition in the running engine. A comparison device (325) provides and indication of a misfire condition (327) when a magnitude of the misfire signal (323) exceeds a magnitude of the normal firing signal (321).</p> |
