| 摘要 |
A device detects ignition on and ignition off events in a vehicle with an internal combustion engine. Ignition events are detected by reading data from the vehicle's data bus. While the ignition is off, the device awakes from time to time to either listen to or poll the data bus. Waking of the device may be triggered by the expiry of a timer or by the detection of a voltage fluctuation of the battery which provides power to both the engine and the device.
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