Patent application number | Description | Published |
20110140668 | Method For Managing Power Limits For A Battery - A method for managing power limits for a battery includes the step of increasing a minimum operating state of charge after an initial power capability has decreased to the point where a predefined full discharge power is not available at an initial minimum operating state of charge. The increased minimum operating state of charge can be chosen such that the full discharge power is available. The increased minimum state of charge may not be chosen to provide the full discharge power if the increased minimum state of charge is greater than a maximum low limit state of charge. | 06-16-2011 |
20110156657 | Method For Managing Power Limits For A Battery - A method for managing power limits for a battery includes the step of increasing a minimum operating state of charge after an initial power capability has decreased to the point where a predefined full discharge power is not available at an initial minimum operating state of charge. The increased minimum operating state of charge can be chosen such that the full discharge power is available. The increased minimum state of charge may not be chosen to provide the full discharge power if the increased minimum state of charge is greater than a maximum low limit state of charge. | 06-30-2011 |
20120161698 | METHOD AND SYSTEM FOR CHARGING A VEHICLE HIGH VOLTAGE BATTERY - A method and a system for charging a battery in hybrid vehicles and electric vehicles are provided. An amount of energy consumption for charging a battery is calculated by taking the sum of a first amount of energy for charging a high voltage battery and a second amount of energy for use by a low voltage auxiliary system during charging. An optimal charge current for a charger is determined based on a charging option. The charging option provides a set of desired charging parameters for a charger controller. A state of charge of the battery is determined within a state of charge range. The charger controller provides a charge current to the battery. The charge current is the optimal charge current up to a maximum charge current for the state of charge range of the battery. | 06-28-2012 |
20120175946 | System And Method For Managing A Power Source In A Vehicle - A system and method for managing a power source in a vehicle that has an engine and an electric machine operable to provide torque to start the engine, includes the step of setting a first discharge power limit for the power source that is at least partly based on the power capability of the power source. A second discharge power limit for the power source is also set. The second discharge power limit is higher than the first discharge power limit, and it is a function of at least the power capability of the power source and the first discharge power limit. | 07-12-2012 |
20120179435 | Method For Determining A Power Capability For A Battery - A method for determining a power capability for a battery includes the step of defining at least one equation based on a circuit model for the behavior of the battery. The equation includes a plurality of battery parameters, including a battery current. The value of at least one of the battery parameters is measured, and the battery current is solved-for from the at least one equation. A limiting battery current is defined based at least in part on the battery current. A limiting battery voltage is determined, and the power capability of the battery is determined based on the limiting battery current and the limiting battery voltage. | 07-12-2012 |
20130006454 | Nonlinear Adaptive Observation Approach to Battery State of Charge Estimation - A method of controlling an electric vehicle including an internal combustion engine, a battery having a state of charge (SOC) and an open circuit voltage (OCV), includes establishing a system for estimating battery SOC. The system includes (i) a parameter estimation subsystem including a recursive parameter estimator for identifying battery parameters and (ii) an OCV estimation subsystem including a nonlinear adaptive observer for estimating battery OCV. Estimated battery OCV is related to estimated battery SOC by a mapping. An output is generated based on the estimated battery SOC. | 01-03-2013 |
20130278223 | Battery Controller with Monitoring Logic for Model-Based Battery Control - A battery controller with monitoring logic for a model-based battery control of a battery performs battery current characterizing, parameter and state variable abnormality detection, and bound checking of error signals between measured and predicted output variables to generate an output. Switching between closed-loop operation (i.e., the model-based battery control) and open-loop operation (i.e., a traditional battery control) is done based on the output of the monitoring logic such that closed-loop stability and performance are reasonably guaranteed. | 10-24-2013 |
20140058595 | ONLINE BATTERY CAPACITY ESTIMATION - An electric vehicle includes a controller configured to estimate battery capacity in accordance with a first state of charge estimation, a charge integration, and a second state of charge estimation. The first and second state of charge estimations are in accordance with time and temperature constraints and are such that the estimated battery capacity has limited uncertainty. The controller is further configured to generate an output based on the estimated battery capacity. | 02-27-2014 |
20140249708 | ONLINE BATTERY CAPACITY ESTIMATION - An electric vehicle includes a controller configured to estimate battery capacity in accordance with a first state of charge estimation, a charge integration, and a second state of charge estimation. The first and second state of charge estimations are in accordance with time and temperature constraints and are such that the estimated battery capacity has limited uncertainty. The controller is further configured to generate an output based on the estimated battery capacity. | 09-04-2014 |
20140265554 | Dual Lithium-Ion Battery System for Electric Vehicles - A battery system for powering a vehicle is provided. The system may include a first lithium-ion battery pack having a first total energy capacity and a first power to energy ratio (P/E ratio) and a second lithium-ion battery pack connected in parallel with the first lithium-ion battery pack and having a second total energy capacity that is higher than the first total energy capacity and a second P/E ratio that is lower than the first P/E ratio. A method of controlling the battery system is also provided, and may include controlling an operation of a vehicle according to a total power capability of the first and second battery strings, wherein the total power capability is the sum of a first battery string power capability and a second battery string power capability at a same voltage. | 09-18-2014 |
20140277866 | REDUCED CENTRAL PROCESSING UNIT LOAD AND MEMORY USAGE BATTERY STATE OF CHARGE CALCULATION - A vehicle having a battery pack with cells grouped into subsets and at least one controller programmed to charge and discharge the battery pack is disclosed. A control output is generated based on a pack state of charge derived from each cell's initial state of charge at vehicle activation and an electric charge accumulated or spent by less than all of the cells of each of the subsets since vehicle activation. A method of estimating battery pack state of charge is disclosed in which a pack state of charge is calculated by identifying subsets of cells having similar properties and calculating an electric charge accumulated or spent for fewer than all of the cells of each subset. A cell state of charge is calculated for all cells based on an average electric charge accumulated or spent. The pack state of charge is based on all the cell states of charge. | 09-18-2014 |
20140361743 | Detection of Imbalance Across Multiple Battery Cells Measured by the Same Voltage Sensor - A vehicle having a battery pack with cells arranged in at least groups of two cells in series is disclosed. A controller balances the cells based on a change in voltage across the cells being different than an expected change in voltage. The expected value is based on a current and a time associated with charging or discharging the cells. A controller is disclosed that commands charging and discharging of the battery cells based on a difference between a voltage across the group and the expected value for the group. A method for charging and discharging a battery pack is disclosed. The voltage across a group of cells is measured and compared to an expected value. An imbalance in a cell attribute is estimated according to a difference between the measured voltage and the expected voltage. The voltage across each battery cell is not required. | 12-11-2014 |
20150064510 | Battery Power Capability Estimation at Vehicle Start - A vehicle is disclosed comprising a battery and a controller. Projected battery impedance parameters are calculated based on predetermined parameter values and historical parameter values generated by a battery parameter estimation model. The values may be weighted according to time data associated with the historical impedance parameter values and a temperature of the battery. Recent historical impedance parameter values may affect the projected battery impedance parameter values more than older historical impedance parameter values. The model is initialized with projected parameter values at vehicle initialization. Battery power capability is calculated using the projected parameter values for a period of time following vehicle initialization. After the period of time following vehicle initialization, battery power capability is calculated using impedance parameters generated by the model. The period of time following vehicle initialization may end when the model output has converged to a stable solution. | 03-05-2015 |