System and method for ground isolation detection in a vehicle
First Claim
1. A system for detecting a ground fault or degraded isolation between a bus terminal and ground or a chassis reference on a vehicle, the system comprising:
- a first bus terminal isolated from ground and the chassis reference during normal operation of the vehicle;
a second bus terminal isolated from ground and the chassis reference during normal operation of the vehicle;
a first amplifier for receiving a first signal from the first bus terminal;
a second amplifier for receiving a second signal from the second bus terminal;
an inverter input of an inverter coupled to an output of the first amplifier;
an analog-to-digital converter input of an analog-to-digital converter coupled to an inverter output of the inverter and an output of the second amplifier; and
a data processor capable of receiving outputted digital data of the analog-to-digital converter, the data processor configured to apply a frequency domain transform to the digital data of the first bus terminal and the second bus terminal;
the data processor identifying at least one of a circuit location of the ground fault or degraded isolation and a type of ground fault or degraded isolation based on the application of the frequency domain transform to the digital data.
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Accused Products
Abstract
A first amplifier is arranged to receive a first signal from a first bus terminal. A second amplifier is configured to receive a second signal from a second bus terminal. An inverter input of an inverter is coupled to the output of the first amplifier. An input or inputs of an analog-to-digital converter are coupled to an inverter output of the inverter and the output of the second amplifier. The analog-to-digital converter is capable of producing a digital signal representative of the signals received from the first bus terminal and the second bus terminal. A data processor is capable of receiving an output of the analog-to-digital converter. The data processor is configured to apply one or more frequency domain transforms to the digital signal. The data processor identifies a circuit location of the ground fault or degraded isolation, a type of ground fault, or both based on the application of the frequency domain transform.
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Citations
21 Claims
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1. A system for detecting a ground fault or degraded isolation between a bus terminal and ground or a chassis reference on a vehicle, the system comprising:
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a first bus terminal isolated from ground and the chassis reference during normal operation of the vehicle; a second bus terminal isolated from ground and the chassis reference during normal operation of the vehicle; a first amplifier for receiving a first signal from the first bus terminal; a second amplifier for receiving a second signal from the second bus terminal; an inverter input of an inverter coupled to an output of the first amplifier; an analog-to-digital converter input of an analog-to-digital converter coupled to an inverter output of the inverter and an output of the second amplifier; and a data processor capable of receiving outputted digital data of the analog-to-digital converter, the data processor configured to apply a frequency domain transform to the digital data of the first bus terminal and the second bus terminal;
the data processor identifying at least one of a circuit location of the ground fault or degraded isolation and a type of ground fault or degraded isolation based on the application of the frequency domain transform to the digital data. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for detecting a ground fault between a first bus terminal, a second bus terminal and ground or chassis reference on a vehicle, the method comprising:
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receiving a first signal from the first bus terminal via an input of the first amplifier; receiving a second signal from the second bus terminal via an input of the second amplifier; establishing a gain of the first amplifier and the second amplifier; inverting an output of the first amplifier; converting the inverted output and the output of the second amplifier into a digital signal; applying a frequency domain transform to the digital signal, representative of the first and second signals received on the first bus terminal and the second bus terminal; and identifying, by a data processor, at least one of a circuit location of the ground fault or degraded isolation, and a type of ground fault or degraded isolation based on the application of the frequency domain transform to the group of samples of measurements. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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Specification