System and method for charging a high voltage bus within a hybrid electric vehicle
First Claim
1. ) A system for charging a high voltage bus within a vehicle, said charging system comprising:
- a source of electrical power;
a pre-charge contactor which is coupled to said source of electrical power and to said high voltage bus, and which is effective to selectively and operatively connect said high voltage bus to said source of electrical power;
a main contactor which is coupled to said source of electrical power and to said high voltage bus, and which is effective to selectively and operatively connect said high voltage bus to said source of electrical power;
a voltage sensor which is effective to measure a voltage of said high voltage bus and to generate signals in response to said measured voltage; and
a controller which is communicatively coupled to said pre-charge contactor, to said main contactor and to said voltage sensor, said controller being effective to receive said signals and to use said signals to calculate the voltage of said high voltage bus and the change in voltage over time of said high voltage bus, said controller being further effective to utilize said calculated voltage and change in voltage over time within a state machine strategy to close said pre-charge contactor and said main contactor, thereby selectively charging said high voltage bus.
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Accused Products
Abstract
A system 10 for charging a high voltage bus 12 within a vehicle 14 including one or more sources of electrical power 16 which provide electrical power to the vehicle 14. System 10 includes a controller 18, a pre-charge contactor 20 and pre-charge resistor 22, a main contactor 24, and a bus voltage sensor 26. Pre-charge contactor 20 and main contactor 24 are each respectively and communicatively coupled to controller 18 by use of electrical buses 28, 30, and sensor 26 is communicatively coupled to controller 18 by use of electrical bus 32. Controller 18 calculates the voltage and change in voltage over time of bus 12 and uses these values within a state machine strategy 50 to close contactors 20, 24, thereby charging high voltage bus 12.
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Citations
20 Claims
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1. ) A system for charging a high voltage bus within a vehicle, said charging system comprising:
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a source of electrical power;
a pre-charge contactor which is coupled to said source of electrical power and to said high voltage bus, and which is effective to selectively and operatively connect said high voltage bus to said source of electrical power;
a main contactor which is coupled to said source of electrical power and to said high voltage bus, and which is effective to selectively and operatively connect said high voltage bus to said source of electrical power;
a voltage sensor which is effective to measure a voltage of said high voltage bus and to generate signals in response to said measured voltage; and
a controller which is communicatively coupled to said pre-charge contactor, to said main contactor and to said voltage sensor, said controller being effective to receive said signals and to use said signals to calculate the voltage of said high voltage bus and the change in voltage over time of said high voltage bus, said controller being further effective to utilize said calculated voltage and change in voltage over time within a state machine strategy to close said pre-charge contactor and said main contactor, thereby selectively charging said high voltage bus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 13, 14, 15, 17, 18, 19, 20)
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12. ) A method for charging a high voltage bus within a vehicle including a source of electrical power and a pre-charge contactor and a main contactor which selectively connect said source of electrical power to said high voltage bus, said method comprising the steps of:
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monitoring the voltage of said high voltage bus;
monitoring the change in voltage over time of said high voltage bus; and
using said monitored voltage and said monitored change in voltage over time within a state machine strategy to determine when to close said pre-charge contactor and said main contactor.
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16. ) A method for charging a high voltage bus within a vehicle including a source of electrical power and a pre-charge contactor and a main contactor which selectively connect said source of electrical power to said high voltage bus, said method comprising the steps of:
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closing said pre-charge contactor, effective to connect said high voltage bus to said source of electrical power;
monitoring the voltage of said high voltage bus;
monitoring the change in voltage over time of said high voltage bus;
determining whether the change in voltage over time of said high voltage bus exceeds a first predetermined value and whether the voltage of said high voltage bus exceeds a second predetermined value;
proceeding to a first state if the change in voltage over time of said high voltage bus exceeds the first predetermined value or if the voltage of said high voltage bus exceeds the second predetermined value;
determining whether the change in voltage over time of said high voltage bus is less than a third predetermined value in the first state;
proceeding to a second state if the change in voltage over time of said high voltage bus is less than the third predetermined value in the first state;
determining whether the voltage of the high voltage bus exceeds a fourth predetermined value in the second state;
proceeding to a third state if the voltage of the high voltage bus does not exceed the fourth predetermined value in the second state, and opening the pre-charge contactor in the third state, thereby terminating the charging of said high voltage bus;
proceeding to a fourth state if the voltage of the high voltage bus exceeds the fourth predetermined value in the second state, and closing the main contactor in the fourth state;
determining whether the bus voltage is greater than a fifth predetermined value in the fourth state;
proceeding to a fifth state if the voltage of the high voltage bus exceeds the fifth predetermined value in the fourth state;
determining whether the change in voltage over time is less than a sixth predetermined value in the fifth state;
proceeding to a sixth state if the change in voltage over time is less than the sixth predetermined value in the fifth state;
determining whether the voltage of the high voltage bus exceeds a seventh predetermined value in the sixth state;
proceeding to a seventh state if the voltage of the high voltage bus does not exceed the fourth predetermined value in the second state, and terminating the charging of said high voltage bus in the seventh state; and
determining that said high voltage bus is fully powered and operational if the voltage of said high voltage bus exceeds said seventh predetermined value in said sixth state.
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Specification