| 摘要 |
<p>A method of detecting and controlling detonation, including the steps of: generating (10) a vibration signal (D) proportional to the intensity of vibration on the crankcase; wide-band-filtering (11) the vibration signal (D) to generate a first intermediate signal; rectifying (12) the first intermediate signal to generate a second intermediate signal; integrating (13) the second intermediate signal to generate a first numeric value; calculating (14) a logarithm of the first numeric value to obtain a second numeric value (xi); calculating (15) a mean value (νi) as a function of the second numeric value (xi); calculating (16) a difference between the second numeric value (xi) and the mean value (νi) to obtain a third numeric value (δi); comparing (17) the third numeric value (δi) with a predetermined threshold value (δ0); determining (18) the presence of detonation in the event the third numeric value (δi) has a first predetermined relationship with the predetermined threshold value (δ0); forming (19, 21) a detonation index (Ii) indicating the behaviour of the engine in terms of detonation; and obtaining (22) a spark lead correction value (CAi) as a function of the detonation index (Ii).</p> |
