US Patent No. 9,934,622

TELEMATICS DEVICES AND METHODS FOR VEHICLE IGNITION DETECTION


Patent No. 9,934,622
Issue Date April 03, 2018
Title Telematics Devices And Methods For Vehicle Ignition Detection
Inventorship Balachander Rajakondala, Holly, MI (US)
Assignee Laird Technologies, Inc., Earth City, MO (US)

Claim of US Patent No. 9,934,622

1. A telematics device, comprising:a controller;
a wireless communication module coupled to the controller, the wireless communication module configured to transmit ignition information from the controller to a remote station;
a power input terminal configured to couple to a battery of a vehicle to sense a voltage of the battery; and
an ignition input terminal configured to couple to an ignition line of the vehicle;
wherein the controller is configured to:
determine whether the ignition input terminal is coupled to an ignition line of the vehicle, by sensing a voltage of the ignition input terminal and determining whether the sensed ignition input voltage is above an ignition connection threshold, and when the sense ignition input voltage is above the ignition connection threshold, determining that the ignition input terminal is coupled to the ignition line of the vehicle;
when the ignition input terminal is coupled to an ignition line of the vehicle, determine vehicle ignition turn on and ignition turn off events by detecting voltage changes on the ignition line; and
when the ignition input terminal is not coupled to an ignition line of the vehicle, sense the voltage of the battery of the vehicle to determine vehicle ignition turn on and turn off events based on sensed voltage changes of the battery.