The utility model discloses a current output type AK protocol
wheel speed sensor receiving circuit. The current output type AK protocol
wheel speed sensor receiving circuit comprises an identification circuit and a
voltage conversion circuit used for converting current signals output by an AK protocol
wheel speed sensor into
voltage signals. The identification circuit comprises a speed pulse identification circuit used for comparing the
voltage signal with a first standard voltage and outputting a first
square wave signal represented by a high level and a low level. The data bit identification circuit is used for comparing the voltage
signal with a second standard voltage and a third standard voltage at the same time and outputting a second
square wave signal represented by a high level and a low level, and the speed pulse identification circuit and the data bit identification circuit are both connected with the voltage conversion circuit; wherein the current signal is divided into a high level, a
middle level and a low level according to the magnitude of the current, and the magnitude of the first standard voltage and the magnitude of the third standard voltage are between the voltage signal corresponding to the high level and the voltage signal corresponding to the
middle level. The size of the second standard voltage is between the voltage signal corresponding to the middle grade and the voltage signal corresponding to the low grade. According to the utility model, the current signal output by the AK protocol wheel speed sensor can be converted into the
square wave signal which can be analyzed by a common
chip, and the square wave signal can be analyzed only by a common electric appliance element, so that the use of a foreign special
chip is avoided, the cost is reduced, and the convenience is improved.