| 摘要 |
<p>To obtain an input speed signal (Un) for use as a feeback signal in an electronic diesel control (EDC), averages are taken by a component (12) of successive speed signals (n) produced by reference marks (BM) on the engine crankshaft. An extrapolator (10) estimates, by linear extrapolation, the average value for a given instant from the last average produced by the component (12) and from the previously calculated average stored in a memory (14). Higher frequency speed fluctuations due to the momentary engine combustion pressures are eliminated from the output signal (Un) whilst avoiding any significant phase delay between the input (n) and output (Un) of the lower frequency fluctuations arising owing to the existence of the oscillatory system comprising the engine and its resilient mounting.</p> |
