Selective response control of DC-DC converters in mild hybrid electric vehicles
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B60L-011/04
H02M-003/04
B60L-011/18
B60K-006/485
B60W-020/50
B60L-003/00
B60L-011/14
B60W-050/029
H02M-001/00
출원번호
US-0271808
(2016-09-21)
등록번호
US-10164522
(2018-12-25)
발명자
/ 주소
Kashyap, Amshumaan R.
Maruneni, Sricharan
Gross, Oliver
출원인 / 주소
FCA US LLC
대리인 / 주소
Smith, Ralph E.
인용정보
피인용 횟수 :
0인용 특허 :
10
초록▼
A control system for a mild hybrid vehicle is configured to detect whether a main contactor is open, the main contactor being connected between a primary battery system and a bi-directional direct current to direct current (DC-DC) converter and in response to detecting that the main contactor is ope
A control system for a mild hybrid vehicle is configured to detect whether a main contactor is open, the main contactor being connected between a primary battery system and a bi-directional direct current to direct current (DC-DC) converter and in response to detecting that the main contactor is open: command the DC-DC converter to operate in a boost mode to excite a motor-generator unit (MGU), after the excitation of the MGU has completed, command the DC-DC converter to operate in a buck mode, determine a previous voltage regulation feedback setpoint for the DC-DC converter, and control the DC-DC converter to maintain a voltage of the secondary battery system within a desired range by inserting a delay to a voltage control loop of the DC-DC converter such that the voltage control loop mimics a bandwidth of the MGU.
대표청구항▼
1. A method for controlling a mild hybrid vehicle, the method comprising: detecting, by a control system of the mild hybrid vehicle, whether a main contactor is open, the main contactor being connected between a primary battery system and a bi-directional direct current to direct current (DC-DC) con
1. A method for controlling a mild hybrid vehicle, the method comprising: detecting, by a control system of the mild hybrid vehicle, whether a main contactor is open, the main contactor being connected between a primary battery system and a bi-directional direct current to direct current (DC-DC) converter, the DC-DC converter being further connected to a secondary battery system; andin response to detecting that the main contactor is open: commanding, by the control system, the DC-DC converter to temporarily operate in a boost mode for a first period to excite a motor-generator unit (MGU), the MGU being coupled to a crankshaft of the engine and connected to the DC-DC converter;after the first period and when the excitation of the MGU has completed, commanding, by the control system, the DC-DC converter to operate in a buck mode;determining, by the control system, a previous voltage regulation feedback setpoint and a current voltage regulation feedback setpoint for the DC-DC converter; andoperating the DC-DC converter in the buck mode and maintaining a voltage of the secondary battery system within a desired range to prevent voltage undershoots and overshoots of the secondary battery system by: controlling, by the control system, the DC-DC converter based on the previous voltage regulation feedback setpoint for a second period, wherein a duration of the second period is based on a difference between bandwidths of the DC-DC converter and the MGU, andafter the second period, controlling, by the control system, the DC-DC converter based on the current voltage regulation feedback setpoint. 2. The method of claim 1, further comprising storing, by the control system, the current voltage regulation feedback setpoint for the DC-DC converter. 3. The method of claim 2, wherein the current voltage regulation feedback setpoint is retrieved as the previous voltage regulation feedback setpoint during a subsequent control cycle of the DC-DC converter. 4. The method of claim 1, wherein the second period is a predetermined period. 5. The method of claim 4, wherein the duration of the second period is approximately 1-2 milliseconds. 6. The method of claim 1, further comprising after the first period and in response to the excitation of the MGU completing, commanding, by the control system, the DC-DC converter to operate in an idle mode for an idle period. 7. The method of claim 6 wherein the control system commands the DC-DC converter to operate in the buck mode after the idle period. 8. The method of claim 1, further comprising receiving, by the control system, a fault signal indicative of the open main contactor. 9. The method of claim 1, wherein a primary voltage rating of the primary battery system is approximately 48 volts and a secondary voltage rating of the secondary battery system is approximately 12 volts. 10. The method of claim 9, wherein the desired range for the secondary battery system is from approximately 11 volts to 13.5 volts. 11. A mild hybrid vehicle, comprising: a primary battery system associated with a primary voltage;a secondary battery system associated with a lesser secondary voltage;a bi-directional direct current to direct current (DC-DC) converter connected between the primary and secondary battery systems;an engine configured to rotatably drive a crankshaft;a motor-generator unit (MGU) connected to the DC-DC converter and the primary battery system and coupled to the crankshaft; anda main contactor (a) connected between (i) the primary battery system and (ii) the DC-DC converter and the MGU and (b) configured to open in response to a fault, thereby disconnecting the DC-DC converter from the primary battery system;a control system configured to, in response to detecting that the main contactor is open: command the DC-DC converter to temporarily operate in a boost mode for a first period to excite the MGU;after the first period and when excitation of the MGU has completed, command the DC-DC converter to operate in a buck mode;determine a previous voltage regulation feedback setpoint and a current voltage regulation feedback setpoint for the DC-DC converter; andoperate the DC-DC converter in the buck mode and maintain the secondary voltage of the secondary battery system within a desired range to prevent voltage undershoots and overshoots of the secondary battery system by: controlling the DC-DC converter based on the previous voltage regulation feedback setpoint for a second period, wherein a duration of the second period is based on a difference between bandwidths of the DC-DC converter and the MGU, andafter the second period, controlling the DC-DC converter based on the current voltage regulation feedback setpoint. 12. The vehicle of claim 11, wherein the control system is further configured to store the current voltage regulation feedback setpoint for the DC-DC converter. 13. The vehicle of claim 12, wherein the current voltage regulation feedback setpoint is retrieved as the previous voltage regulation feedback setpoint during a subsequent control cycle of the DC-DC converter. 14. The vehicle of claim 11, wherein the second period is a predetermined period. 15. The vehicle of claim 14, wherein the duration of the second period is approximately 1-2 milliseconds. 16. The vehicle of claim 11, wherein the control system is further configured to, after the first period and in response to the excitation of the MCU completing, command the DC-DC converter to operate in an idle mode for an idle period. 17. The vehicle of claim 16 wherein the commanding of the DC-DC converter to operate in the buck mode occurs after the idle period. 18. The vehicle of claim 11, wherein the control system is further configured to receive a fault signal indicative of the open main contactor. 19. The vehicle of claim 11, wherein a primary voltage rating of the primary battery system is approximately 48 volts and a secondary voltage rating of the secondary battery system is approximately 12 volts. 20. The vehicle of claim 19, wherein the desired range for the secondary battery system is from approximately 11 volts to 13.5 volts.
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