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US 11,448,706 B2Granted
System and method for calculating insulation resistance
AssigneeLG Energy Solution, Ltd.
InventorsJaedong Park, Hyunki Cho
Life of this patent
Estimating the term…
Abstract
A system and a method for calculating insulation resistance, and more particularly for calculating insulation resistance between a positive terminal and a negative terminal of a battery and a chassis based on voltages of the battery applied to a resistor that connects the positive terminal of the battery and the chassis and a resistor that connects the negative terminal of the battery and the chassis.
Claims14
A system for calculating insulation resistance, the system comprising:
- a first resistor unit configured to switchably connect a first node to a second node, wherein the first node is between a positive terminal of a battery and the first resistor unit, and wherein the second node is between the first resistor unit and a chassis;
- a second resistor unit configured to switchably connect the second node to a third node, wherein the second node is between the second resistor unit and the chassis, and wherein the third node is between a negative terminal of the battery and the second resistor unit;
- a third resistor unit configured to switchably connect the second node to the third node, wherein the second node is between the third resistor unit and the chassis, wherein the third node is negative terminal of the battery and the third resistor unit, and wherein the third resistor unit and the second resistor unit are in parallel between the second node and the third node;
- and
- a control unit configured to control conduction states of the first, second and third resistor units,
- wherein the control unit is further configured to calculate an insulation resistance between the positive terminal of the battery and the chassis, and an insulation resistance between the negative terminal of the battery and the chassis, relative to a voltage of a negative terminal side of the battery, based at least in part on (i) a first voltage difference between the second node and third node when the second node and the third node are connected through only the second resistor unit and (ii) a second voltage difference between the second node and third node when the second node and the third node are connected through both the second resistor unit and the third resistor unit.
3 more elements
A method of calculating insulation resistance, the method comprising:
- controlling a conduction state of a first resistor unit which switchably connects a first node to a second node, wherein the first node is between a positive terminal of a battery and the first resistor unit, and wherein the second node is between the first resistor unit and a chassis of a vehicle;
- controlling a conduction state of a second resistor unit which switchably connects the second node to a third node, wherein the second node is between the second resistor unit and the chassis, and wherein the third node is between a negative terminal of the battery and the second resistor unit;
- and
- controlling a conduction state of a third resistor unit which is switchably connects the second node to the third node, wherein the second node is between the third resistor unit and the chassis, wherein the third node is negative terminal of the battery and the third resistor unit, wherein the third resistor unit and the second resistor unit are in parallel between the second node and the third node;
- measuring (i) a first voltage difference between the second node and third node when the second node and the third node are connected through only the second resistor unit and (ii) a second voltage difference between the second node and third node when the second node and the third node are connected through both the second resistor unit and the third resistor unit;
- and
- calculating an insulation resistance between the positive terminal of the battery and the chassis and an insulation resistance between the negative terminal of the battery and the chassis based at least in part on the measured first voltage difference and the measured second voltage difference.
4 more elements
Dependencies are inferred from the claim text.