Method of controlling a state-of-charge (SOC) of a vehicle battery
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
H02J-007/14
H01M-010/42
H01M-010/48
출원번호
US-0021204
(2011-02-04)
등록번호
US-8937452
(2015-01-20)
발명자
/ 주소
Schwarz, Jonathan R.
Smith, Gregory E.
Hanna, Ian L.
Frisch, Damon R.
출원인 / 주소
GM Global Technology Operations LLC
대리인 / 주소
Anderson, Lionel D.
인용정보
피인용 횟수 :
1인용 특허 :
1
초록▼
A system and method for controlling a state-of-charge (SOC) of a vehicle battery, such as a high-voltage battery used by a hybrid electric vehicle (HEV) for vehicle propulsion, so that the SOC is maintained within a desired SOC range that is temperature-dependent. In an exemplary embodiment, the sys
A system and method for controlling a state-of-charge (SOC) of a vehicle battery, such as a high-voltage battery used by a hybrid electric vehicle (HEV) for vehicle propulsion, so that the SOC is maintained within a desired SOC range that is temperature-dependent. In an exemplary embodiment, the system and method use a battery temperature prediction to determine a desired SOC range, and then control the amount of charge on the vehicle battery such that the SOC is maintained within the desired SOC range. As the battery temperature prediction goes lower (i.e., as it gets colder), the desired SOC range may need to be adjusted or shifted upwards in order to account for increased internal battery resistance and to ensure that the vehicle battery has enough power to start the vehicle. Similarly, as the battery temperature prediction goes higher (i.e., as it gets warmer), the desired SOC range may need to be adjusted or shifted downwards in order to reduce degradation effects and improve battery. The exemplary system and method control the SOC of the vehicle battery and may seek to optimize a number of different parameters, including battery life, battery performance and/or vehicle fuel economy.
대표청구항▼
1. A method of controlling a state-of-charge (SOC) of a vehicle battery, comprising the steps of: (a) generating a battery temperature prediction for the vehicle battery;(b) using the battery temperature prediction to determine a desired SOC range for the vehicle battery that includes an upper SOC l
1. A method of controlling a state-of-charge (SOC) of a vehicle battery, comprising the steps of: (a) generating a battery temperature prediction for the vehicle battery;(b) using the battery temperature prediction to determine a desired SOC range for the vehicle battery that includes an upper SOC limit, a lower SOC limit, or both, when the battery temperature prediction is warmer than a temperature threshold the desired SOC range is determined for optimum fuel efficiency, and when the battery temperature prediction is colder than a temperature threshold the desired SOC range is adjusted to ensure that the vehicle battery has enough charge to start the vehicle in a cold environment, wherein the desired SOC range is at least partially temperature dependent; and(c) controlling the amount of charge on the vehicle battery while the vehicle is being driven so that the SOC of the vehicle battery is substantially maintained within the desired SOC range. 2. The method of claim 1, wherein step (a) further comprises generating the battery temperature prediction by using at least one piece of historical data selected from the group consisting of: past outside temperatures or past battery temperatures. 3. The method of claim 1, wherein step (a) further comprises generating the battery temperature prediction by receiving a forecasted outside temperature from a telematics that receives it from a weather-related service. 4. The method of claim 1, wherein step (b) further comprises using the battery temperature prediction to select between a plurality of SOC regions, wherein at least one of the SOC regions includes an upper SOC limit or a lower SOC limit that varies according to temperature. 5. A method of controlling a state-of-charge (SOC) of a vehicle battery, comprising the steps of: (a) generating a battery temperature prediction for the vehicle battery by receiving an actual outside temperature from a first sensor and an actual battery temperature from a second sensor, and setting the battery temperature prediction to the lower of the actual outside temperature and the actual battery temperature;(b) using the battery temperature prediction to determine a desired SOC range for the vehicle battery that includes an upper SOC limit, a lower SOC limit, or both, wherein the desired SOC range is at least partially temperature dependent; and(c) controlling the amount of charge on the vehicle battery so that the SOC of the vehicle battery is substantially maintained within the desired SOC range. 6. A method of controlling a state-of-charge (SOC) of a vehicle battery, comprising the steps of: (a) generating a battery temperature prediction for the vehicle battery;(b) comparing the battery temperature prediction to a first temperature threshold, if the battery temperature prediction is greater than the first temperature threshold then using a first SOC region to determine the desired SOC range where the first SOC region has at least one of an upper SOC limit or a lower SOC limit that is substantially constant over a temperature range, and if the battery temperature prediction is less than the first temperature threshold then using a second SOC region to determine the desired SOC range where the second SOC region has at least one of an upper SOC limit or a lower SOC limit that varies over a temperature range, wherein the desired SOC range is at least partially temperature dependent; and(c) controlling the amount of charge on the vehicle battery while the vehicle is being driven so that the SOC of the vehicle battery is substantially maintained within the desired SOC range. 7. The method of claim 6, wherein the first SOC region has an upper SOC limit and a lower SOC limit that are substantially constant over a temperature range, and the first SOC region has upper and lower SOC limits that are lower than those of the second SOC region. 8. The method of claim 6, wherein the second SOC region is a transition region and has an upper SOC limit and a lower SOC limit that vary over a temperature range, and the second SOC region has upper and lower SOC limits that are higher than those of the first SOC region. 9. The method of claim 6, wherein the first temperature threshold is between −15° C. and −25° C., inclusive. 10. The method of claim 6, wherein step (b) further comprises comparing the battery temperature prediction to a second temperature threshold, if the battery temperature prediction is greater than the second temperature threshold then using the second SOC region to determine the desired SOC range, and if the battery temperature prediction is less than the second temperature threshold then using a third SOC region to determine the desired SOC range. 11. The method of claim 10, wherein the third SOC region has an upper SOC limit and a lower SOC limit that are substantially constant over a temperature range, and the third SOC region has upper and lower SOC limits that are higher than those of the first and second SOC regions. 12. The method of claim 10, wherein the third SOC region has an upper SOC limit that varies over a temperature range, and a lower SOC limit that is substantially constant over a temperature range. 13. The method of claim 10, wherein the second temperature threshold is between −20° C. and −30° C., inclusive. 14. A method of controlling a state-of-charge (SOC) of a vehicle battery, comprising the steps of: (a) determining a battery temperature for the vehicle battery;(b) comparing the battery temperature to a temperature threshold, wherein the temperature threshold is at least partially based on a minimum amount of cold cranking amps needed to start the vehicle in a cold environment;(c) if the battery temperature is less than the temperature threshold, then adjusting a desired SOC range for the vehicle battery by increasing an upper SOC limit, a lower SOC limit, or both; and(d) controlling the amount of charge on the vehicle battery while the vehicle is being driven so that the SOC of the vehicle battery is substantially maintained within the desired SOC range having the increased upper SOC limit, the increased lower SOC limit, or both and maintaining enough charge on the vehicle battery to provide sufficient cold cranking amps to start the vehicle at temperatures below the temperature threshold the next time the vehicle is started. 15. The method of claim 14, wherein step (a) further comprises determining a battery temperature for the vehicle battery by generating a battery temperature prediction. 16. The method of claim 14, wherein the desired SOC range is in a transition region and has an upper SOC limit and a lower SOC limit that vary over a temperature range. 17. The method of claim 14, further comprising the step of: comparing the battery temperature to a second temperature threshold, if the battery temperature is greater than the second temperature threshold then using a second SOC region to determine the desired SOC range, and if the battery temperature is less than the second temperature threshold then using a third SOC region to determine the desired SOC range. 18. The method of claim 14, wherein step (c) further comprises using the battery temperature to select between a plurality of SOC regions, wherein at least one of the SOC regions includes an upper SOC limit or a lower SOC limit that varies according to temperature. 19. A battery control system for use in a vehicle, comprising: a high-voltage vehicle battery;a battery control module;at least one temperature sensor being coupled to the battery control module and providing the battery control module with a battery temperature reading; anda battery charging device, a battery discharging device, or both being coupled to the battery control module and being capable of influencing a state-of-charge (SOC) of the vehicle battery;wherein the battery control module determines a desired SOC range based at least partially on the battery temperature reading, when the battery temperature reading suggests a temperature warmer than a temperature threshold the desired SOC range is determined for optimum fuel efficiency, and when the battery temperature reading suggests a temperature colder than a temperature threshold the desired SOC range is adjusted to ensure that the vehicle battery has enough charge to start the vehicle in a cold environment, and the battery control module controls the battery charging device, the battery discharging device, or both such that the vehicle battery is substantially maintained within the desired SOC range while the vehicle is being driven.
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