Gearbox rotating speed measuring method

The invention provides a gearbox rotating speed measuring method. The gearbox rotating speed measuring method comprises the steps that an input shaft rotating speed measuring sensor is arranged on a fluted disk on any gear x, the rotating speed is sampled at a sampling clock frequency, and the pulse period of a rotating speed pulse is measured; the rotating speed value of an input shaft is calculated according to a transmission ratio and the number of a full circle of teeth on the fluted disk; an output shaft rotating speed measuring sensor is arranged on a fluted disk on an output shaft, the output rotating speed is sampled at a sample time clock frequency, and the pulse period of the output rotating speed pulse is measured; when the gear is fixed, the rotating speed of the output shaft is calculated according to the number of a full circle of teeth on the fluted disk on the output shaft and the pulse period; in the gear shifting process, the rotating speed of the output shaft is calculated according to the average value of k newest pulse periods of the output rotating speed pulses. The gearbox rotating speed measuring method can meet the requirements for accurate, stable and real-time measurement of the rotating speed during gear shifting of a gearbox at the same time.