Acquisition system and method for an internal combustion engine speed signal

The present invention provides a system and method for collecting engine speed signal, comprising: a plurality of ECU; first stage ECU magnetic speed signal acquisition, the acquired signal into a magnetic speed transmitted to the MCU itself Hall speed signal, simultaneously transmitting a second stage adjacent to the ECU; second level ECU transmits a signal to the Hall speed itself MCU, simultaneously transmitted to the adjacent third stage ECU; ECU third level and so on. In the interior of the ECU to achieve the magnetic speed signal into a speed signal Hall, this eliminates the need to develop additional speed dedicated processing circuit cost. The number of dedicated ECU can be connected without rotational speed limit processing circuit pin, without considering the transmission delay signal, a plurality of speed signals simultaneously received numerous ECU, to ensure consistent ECU plurality of simultaneously injection timing calculated sex.