Method for Correcting the Tooth Deviation of Magnetoelectric Speed ​​Signal Disc and Conditioning Circuit

Abstract

The invention provides a circuit for conditioning the deviation of a tooth of a magnetoelectric speed signal panel. The circuit for conditioning the deviation of the tooth of the magnetoelectric speed signal panel comprises a positive semi-cycle conditioning circuit and a negative semi-cycle conditioning circuit, wherein electrodynamic potential signals generated by the tooth of the magnetoelectric sensor measuring signal panel are transmitted into the positive semi-cycle conditioning circuit and the negative semi-cycle conditioning circuit respectively, the negative semi-cycle of the electrodynamic potential signals of the magnetoelectric sensor are cut off by a first signal processing circuit to generate a voltage analog signal S1, and the voltage analog signal S1 is processed by a first comparison output circuit to generate a digital pulse signal P1; the positive semi-cycle of the electrodynamic potential signals of the magnetoelectric sensor are cut off by a second signal processing circuit and the negative semi-cycle of the electrodynamic potential signals are inverted and then are output by the second signal processing circuit to generate a voltage analog signal S2, and the voltage analog signal S2 is processed by a second comparison output circuit to generate a digital pulse signal P2; the signal P1 and the signal P2 are sent to a control unit to be further processed. The method for correcting the deviation of the tooth of the magnetoelectric speed signal panel and the circuit for conditioning the deviation of the tooth of the magnetoelectric speed signal panel are used for recognizing the position of the central line of the convex tooth of the signal panel.

Description

technical field [0001] The invention relates to an engine electronic control technology, in particular to a method and a conditioning circuit for correcting disc tooth deviation of a magnetoelectric rotational speed signal. Background technique [0002] The magnetoelectric speed sensor generates a periodic voltage signal when the signal disc teeth pass by. Chinese patent CN101520468, a magnetoelectric sensor conditioning circuit, the processing method of this patent is to convert the positive half-cycle voltage signal into a digital signal that can be received by the single-chip microcomputer, and the reference threshold voltage of the voltage comparator is kept constant during circuit design, so , it will cause the position of the output digital signal pulse relative to the center line of the convex tooth of the signal disc to change when the speed is high and low, and the digital signal pulse edge is directly used as the phase control reference in the control calculation, ...

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Problems solved by technology

Chinese patent CN101520468, a magnetoelectric sensor conditioning circuit, the processing method of this patent is to convert the positive half-cycle voltage signal into a digital signal that can be received by the single-chip microcomputer, and the reference threshold voltage of the voltage comparator is kept constant during circuit design, so , it will cause the position of the output digital signal pulse relative to the center line of the convex tooth of the signal disc to change when the speed is high and low, and the digital signal pulse edge is directly used as the phase control reference in the control calculation, so the measured signal pulse will be There is a deviation from the actual mechanical position, and this deviation changes with the change of the rotational speed, which affects the control accuracy of the system and further affects the engine performance

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