Isolation monitoring system and method utilizing a variable emulated inductance
First Claim
1. A system for measuring a leakage resistance between a high voltage (HV) system of a vehicle and a vehicle chassis, comprising:
- an emulated inductance that is connected between the HV system and the vehicle chassis and that has an inductive reactance that substantially cancels a capacitive reactance between the HV system and the vehicle chassis, wherein the emulated inductance includes a variable resistance;
a signal source that outputs one of an AC current signal and an AC voltage signal between the HV system and the vehicle chassis;
a sensor that measures one of;
an AC current response to the AC voltage signal between the HV system and the vehicle chassis; and
an AC voltage response to the AC current signal between the HV system and the vehicle chassis; and
a control module that varies the variable resistance over a range of values, identifies one of the values of the variable resistance that corresponds to a peak voltage associated with the emulated inductance, sets the variable resistance to the one of the values, and calculates the leakage resistance based on the one of the AC current response and the AC voltage response while the variable resistance is set to the one of the values.
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Accused Products
Abstract
A system for measuring leakage resistance between a high voltage (HV) system of a vehicle and a vehicle chassis includes an emulated inductance that is connected between the HV system and the vehicle chassis and that has an inductive reactance that substantially cancels a capacitive reactance between the HV system and the vehicle chassis. A signal source outputs one of an AC current signal and an AC voltage signal between the HV system and the vehicle chassis. A sensor measures one of an AC current response to the AC voltage signal between the HV system and the vehicle chassis and an AC voltage response to the AC current signal between the HV system and the vehicle chassis.
61 Citations
17 Claims
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1. A system for measuring a leakage resistance between a high voltage (HV) system of a vehicle and a vehicle chassis, comprising:
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an emulated inductance that is connected between the HV system and the vehicle chassis and that has an inductive reactance that substantially cancels a capacitive reactance between the HV system and the vehicle chassis, wherein the emulated inductance includes a variable resistance; a signal source that outputs one of an AC current signal and an AC voltage signal between the HV system and the vehicle chassis; a sensor that measures one of; an AC current response to the AC voltage signal between the HV system and the vehicle chassis; and an AC voltage response to the AC current signal between the HV system and the vehicle chassis; and a control module that varies the variable resistance over a range of values, identifies one of the values of the variable resistance that corresponds to a peak voltage associated with the emulated inductance, sets the variable resistance to the one of the values, and calculates the leakage resistance based on the one of the AC current response and the AC voltage response while the variable resistance is set to the one of the values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for measuring a leakage resistance between a high voltage (HV) system of a vehicle and a vehicle chassis, comprising:
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an emulated inductance that is connected between the HV system and the vehicle chassis and that has an inductive reactance that substantially cancels a capacitive reactance between the HV system and the vehicle chassis; a signal source that outputs one of an AC current signal and an AC voltage signal between the HV system and the vehicle chassis; a sensor that measures one of; an AC current response to the AC voltage signal between the HV system and the vehicle chassis; and an AC voltage response to the AC current signal between the HV system and the vehicle chassis; and a control module that calculates the leakage resistance based on one of; the AC current signal and the AC voltage response; and the AC voltage signal and the AC current response, wherein; the control module generates T values of the leakage resistance, selects S of the T values, where S and T are integers greater than two and S<
T, and calculates a final leakage resistance value as a function of the S values; andthe control module selects the S values based on an enable signal received from one of a HV controller and a vehicle system controller.
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11. A method for measuring a leakage resistance between a high voltage (HV) system of a vehicle and a vehicle chassis, comprising:
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generating an emulated inductance between the HV system and the vehicle chassis; substantially cancelling a capacitive reactance between the HV system and the vehicle chassis using inductive reactance of the emulated inductance; generating one of an AC current signal and an AC voltage signal between the HV system and the vehicle chassis; measuring one of; an AC current response to the AC voltage signal between the HV system and the vehicle chassis; and an AC voltage response to the AC current signal between the HV system and the vehicle chassis varying a variable resistance of the emulated inductance over a range of values; identifying one of the values of the variable resistance that corresponds to a peak voltage associated with the emulated inductance; setting the variable resistance to the one of the values; and calculating the leakage resistance based on the one of the AC current response and the AC voltage response while the variable resistance is set to the one of the values. - View Dependent Claims (12, 13, 14, 15, 16, 17)
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Specification