Design of New Automobile Rotational Speed Measuring Device
The automobile rotational speed measurement device, consisting of information collecting and processing, phase-locked loops, wave shaping, frequency division and display, can be applied for measurement of the rotational speed of automobiles with various cylinders.
G. Y. Yu and L. Zhang, "Design of New Automobile Rotational Speed Measuring Device", Advanced Materials Research, Vols. 383-390, pp. 325-328, 2012