| 摘要 |
A transmission comprises a multi-ratio gearbox 12 having an input shaft 15 and an output shaft 44. The input shaft 15 and output shaft 44 have sensors 42, 43 which produce pulsed output signals, the number of pulses of the output signals being proportional to the number of rotations of the shafts 15, 44. A gear ratio is determined by counting the number of pulses produced by sensor 43 over a period taken for the sensor 42 to produce a predetermined number of pulses (for example 100), that is the gear ration will be a predetermined number of pulses produced by sensor 42 to the number of pulses produce by sensor 43 over the same period. Sensors 42, 43 may comprise an inductive pickup mounted in proximity to a circumference of a toothed wheel fixed to shafts 15, 44. Wheel sensors 62 may also be provided so that an overall ratio of the transmission and differential may be determined.
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