Patent application number | Description | Published |
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 |
20130006455 | NONLINEAR OBSERVER FOR 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), is provided. The method includes establishing a system for estimating battery SOC. The system includes an OCV estimation subsystem including an adaptive observer for estimating battery OCV. Estimated battery OCV is related to estimated battery SOC by a nonlinear 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 |
20140034741 | METHOD AND SYSTEM FOR REGULATING ENGINE TEMPERATURE - A system and method for operating a device at a desired temperature is described. In one example, current supplied to a heater that melts a wax medium or material controlling flow through a valve is adjusted to reduce valve opening and closing delay. The system and method may improve device temperature control, thereby reducing device emissions, enhancing device performance, and improving device durability. | 02-06-2014 |
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 |
20140149010 | Environment-Aware Regenerative Braking Energy Calculation Method - A method of operating a vehicle includes implementing regenerative braking of the vehicle using discounted regeneration energy based on physical route conditions and base regenerative braking parameters for the vehicle. | 05-29-2014 |
20140214268 | TEMPERATURE COMPENSATED BATTERY PARAMETER ESTIMATION - A vehicle is provided with a vehicle system having an electric machine and a battery. The electric machine is configured to provide drive torque and the battery supplies power to the electric machine. The vehicle also includes a controller that is configured to generate output indicative of at least one of a battery power capability and a battery state of charge using a filter having a variable EKF gain factor based on battery temperature. | 07-31-2014 |
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 |
20140266059 | SELECTIVE UPDATING OF BATTERY PARAMETER ESTIMATIONS - A vehicle is provided with an electric machine that is configured to provide drive torque, and a battery for supplying power to the electric machine. The vehicle also includes a controller that is configured to estimate present battery parameters based on input indicative of the power supplied by the battery. The controller is also configured to generate output indicative of battery power capability based on the input and prior battery parameters in response to a rate of change of a component of the power being less than a lower boundary. | 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 |
20150066405 | PARAMETER AND STATE LIMITING IN MODEL BASED BATTERY CONTROL - A method of determining battery power capability may include: determining a circuit model for a battery, including a first resistance (r | 03-05-2015 |
20150083079 | METHODS AND SYSTEMS FOR SELECTIVE ENGINE STARTING - Systems and methods for starting an engine are described. In one example, engine cranking speed for an engine of a hybrid vehicle is adjusted in response to operating conditions. The engine cranking speed may be reduced when capability of a battery that supplies power to rotate the engine is less than an amount of power to rotate the engine at a higher speed. | 03-26-2015 |