Gm Global Technolgoy Operations, Inc.

Calvin Wang

Chaitanya Sankavaram

Shiming Duan

Garrett M Seeman

Christopher Harold Knieper

Paul Edward Krajewski

Ciro A Spigno

Zining Zhang

A system for monitoring a battery of a vehicle includes a current measuring circuit to measure a current of the battery comprising a plurality of cell groups connected to each other. A voltage measuring circuit is to measure voltages of the cell groups. A controller is configured to define a plurality operating regions in a current profile of the battery during a drive cycle of the vehicle. The controller is configured to filter the current and the voltages measured in the operating regions and calculate internal resistances of the cell groups in the operating regions based on the filtered current and voltages. The controller is configured to generate statistical values based on the internal resistances of the cell groups and determine whether one or more of the cell groups is faulty based on differences between maximum and minimum values of one of the statistical values across the cell groups.

Resistance estimation of high voltage battery packs during vehicle driving operation

A current measuring circuit measures a charging current of a battery comprising a plurality of cell groups while the battery is being charged using one of a plurality of charging systems. A voltage measuring circuit measures voltages of the cell groups. A controller defines a plurality operating regions in a charging current profile of the battery during a charging cycle, filters the charging current and the voltages measured in the operating regions, calculates internal resistances of the cell groups in the operating regions based on the filtered current and voltages, generates at least one of statistical values and distance metrics based on the internal resistances of the cell groups, and determines whether one or more of the cell groups is faulty based on the at least one of the statistical values and the distance metrics irrespective of the plurality of charging systems used to charge the battery.

Resistance estimation of high voltage battery packs during vehicle charging operation

A method of diagnosing a leak in a coolant system of an automobile includes repeatedly measuring the coolant level within the coolant system at a pre-determined time interval, calculating a short term leak rate, wherein the short term leak rate is the rate of coolant leakage over a first pre-determined length of time, calculating a long term leak rate, wherein the long term leak rate is the rate of coolant leakage over a second pre-determined length of time, further wherein the second pre-determined length of time is longer than the first pre-determined length of time, identifying a coolant system leakage state based on a current coolant level within the coolant system, the short term leak rate, and the long term leak rate, and providing notification of the coolant system leakage state to an operator of the vehicle.

Coolant leak diagnosis

A method of identifying air flow faults within a cooling system of an automobile comprises measuring the temperature of coolant entering a heat exchanger for the cooling system, measuring the temperature of coolant leaving the heat exchanger, and measuring the temperature of ambient air that is flowing into the heat exchanger, calculating Actual Delta T by subtracting the temperature of coolant leaving the heat exchanger from the temperature of coolant entering the heat exchanger, calculating Expected Delta T, wherein Expected Delta T is a pre-determined value of an expected difference between the temperature of the coolant entering the heat exchanger and the temperature of the coolant leaving the heat exchanger, calculating Effective Delta T by subtracting Expected Delta T from Actual Delta T, and identifying a fault in the air flow through the heat exchanger based on the value of Effective Delta T.

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Sterling Heights, MI, United States of America

Calvin Wang