| 摘要 |
The system uses a computer to determine the first and second derivatives of engine speed w.r.t. time and their filtering. It then compares it with previously determined ratios to determine whether the engine is decelerating and inputs a clutch engagement/disengagement confirming signal to the engine management system. The computer is provided with suitably filtered inputs representative of vehicle (V) and engine (N) speeds, from which it calculates the ratio they bear to one another and the 1st and 2nd derivatives of engine speed w.r.t. time. Comparison of the input ratio with previously established ratios associated with particular gear ratios gives rise to a signal (SEMB) confirming clutch engagement. If this signal alters, while the derivatives disclose engine deceleration, a further signal (SDEB), indicative of disengagement, is produced. Both signals are passed to a logic unit (BASCULE) which produces an output signal (SE) in binary form utilisable by the vehicle's engine management unit. A supplementary feature (DETECTION, etc.) suspends the identification process if the engine speed varies too rapidly. |
