Method and apparatus for detecting key-on and key-off states using time-to-frequency transforms
First Claim
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1. A method comprising:
- collecting, by a processor, a sequence of battery voltage samples for a vehicle,the collected sequence of battery voltage samples being stored in a memory associated with the processor;
calculating, by the processor, a time-domain to frequency-domain transform (TFT) for the collected sequence of battery voltage samples to produce a set of frequency domain features; and
causing, by the processor, a key state of the vehicle to be determined using the set of frequency domain features,the key state indicating whether the vehicle is active or whether the vehicle is inactive.
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Abstract
A key state detector for a vehicle collects a sequence of battery voltage samples and applies a time-domain to frequency-domain transform (TFT) to the collected samples. The results of the TFT are then applied to an artificial neural network (ANN) to determine if they represent a key-on or key-off state. The ANN is trained based on data collected from the vehicle and is periodically retrained so that the detection of key-on and key-off states conforms to the particular vehicle and tracks the aging of vehicle components.
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Citations
20 Claims
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1. A method comprising:
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collecting, by a processor, a sequence of battery voltage samples for a vehicle, the collected sequence of battery voltage samples being stored in a memory associated with the processor; calculating, by the processor, a time-domain to frequency-domain transform (TFT) for the collected sequence of battery voltage samples to produce a set of frequency domain features; and causing, by the processor, a key state of the vehicle to be determined using the set of frequency domain features, the key state indicating whether the vehicle is active or whether the vehicle is inactive. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system comprising:
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an analog-to-digital converter (ADC) to sample a battery voltage of a vehicle at particular intervals to collect respective sets of digitized battery voltage samples; a memory coupled to the ADC to store the collected respective sets of digitized battery voltage samples; and a processor configured to; calculate a time-domain to frequency-domain transform (TFT) for each set of digitized battery voltage samples, of the collected respective sets of digitized battery voltage samples, to produce respective sets of frequency domain features, and cause a key state of the vehicle to be determined using the respective sets of frequency domain features, the key state indicating whether the vehicle is active or whether the vehicle is inactive. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A non-transitory computer readable medium storing instructions, the instructions comprising:
one or more instructions which, when executed by a processor, cause flail the processor to; collect a plurality of sets of battery voltage samples for a vehicle, the collected plurality of sets of battery voltage samples being stored in a memory associated with the processor; calculate, for each set of battery voltage samples of the collected plurality of sets of battery voltage samples, a time-domain to frequency-domain transform (TFT) to produce a respective set of frequency domain features; and cause a key state of the vehicle to be determined using the respective set of frequency domain features, the key state indicating whether the vehicle is active or whether the vehicle is inactive. - View Dependent Claims (16, 17, 18, 19, 20)
Specification