| 摘要 |
A vehicle data acquisition device (103; 105) for coupling to a vehicle to acquire data from the vehicle comprising a processor (111; 121) configured to receive a signal relating to a vehicle operating parameter. The processor (111, 121) is configured to identify a pattern in the received signal, the pattern being generated by a reference event performed by the vehicle. The processor may apply a timestamp to the signal based on the identified pattern in the received signal and output the timestamped signal to a vehicle diagnostic system. The pattern may be identified by comparing the received signal to one or more predefined signal parameters such as upper or lower thresholds, a change in magnitude, a rate of change, peaks, troughs, raising or falling edges, slopes, a pulse width, a DTC raising, a DTC status change or the absence of a response signal from an ECU and the like. The signal parameters may have to occur within a prescribed period of time. The reference event may relate to a vehicle operating condition, such as a cranking event of an internal combustion engine. |
