CN114552524A - High-voltage power distribution unit for vehicle-mounted composite power supply and control method thereof - Google Patents

High-voltage power distribution unit for vehicle-mounted composite power supply and control method thereof Download PDF

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Publication number
CN114552524A
CN114552524A CN202210224532.8A CN202210224532A CN114552524A CN 114552524 A CN114552524 A CN 114552524A CN 202210224532 A CN202210224532 A CN 202210224532A CN 114552524 A CN114552524 A CN 114552524A
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China
Prior art keywords
contactor
voltage
sampling point
state
fuse
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CN114552524B (en
Inventor
黄昌富
李建旺
祁文睿
张庆军
肖清安
焦雷
吴康
栾焕强
李阁强
邱泽刚
董振乐
潘恒宇
田国文
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Henan University of Science and Technology
China Railway 15th Bureau Group Co Ltd
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Henan University of Science and Technology
China Railway 15th Bureau Group Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H1/00—Details of emergency protective circuit arrangements
    • H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/05—Details with means for increasing reliability, e.g. redundancy arrangements
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

The invention discloses a high-voltage power distribution unit for a vehicle-mounted composite power supply and a control method thereof, and the high-voltage power distribution unit structurally comprises a power supply power distribution loop, a load power distribution loop, an insulation detection loop, a sensor, a high-voltage control unit and the like; the control method realizes high redundancy of the system by independent control and parallel coupling of the composite power system loop, realizes real-time state monitoring and fault diagnosis of the system by feedback signals of the high-voltage contactor and feedback signals of the connector and the like, realizes system insulation detection by step-by-step power-on control of the system, and has the functions of loop current detection and the like. The technical scheme can realize high-safety and high-redundancy high-voltage power distribution and control of vehicles such as pure electric vehicles, hybrid power vehicles, fuel cells and the like matched with the composite power supply.

Description

High-voltage power distribution unit for vehicle-mounted composite power supply and control method thereof
Technical Field
The invention belongs to the field of automobile control, and particularly relates to a high-voltage power distribution unit for a vehicle-mounted composite power supply and a control method thereof.
Background
The vehicle-mounted composite power supply system is a power supply system which uses two or more than two power supplies capable of providing electric energy or storing electric energy for a vehicle at the same time, the control unit provides or absorbs electric energy by the power supply system alone or together according to the state of parts of the whole vehicle or the power demand state of the whole vehicle, and common power supply systems comprise a lithium battery system, a lead-acid battery system, a super capacitor system and the like. The high-voltage distribution unit generally comprises a contactor, a fuse, a connector, a control unit, a shell, a corresponding sensor and the like, receives an external control instruction or a control signal, directly controls the on-off of the contactor through the control unit or the external control signal, the circuit is matched with the fuse to realize the overcurrent protection of the circuit, the connector is used for connecting a high-voltage circuit and a low-voltage circuit, the shell realizes the protection and the high-voltage protection of internal devices, and the corresponding sensor realizes the acquisition of current or other signals.
The high-voltage power distribution unit is used as an indispensable component of a vehicle with a high-voltage electric drive system, whether the power distribution function is complete or not, whether the signal detection function meets the strategy requirement of the whole vehicle or not, whether the state monitoring functions of a contactor, a connector and a fuse are complete or not, and the like, and is directly related to the realization of the function of the whole vehicle electric drive system, the completion of the fault diagnosis function, high-voltage safety protection and the like.
The hybrid power supply is a new type of vehicle power supply that needs to be matched to the high voltage distribution unit threshold matching its function and performance. The traditional loop parallel connection joint control scheme cannot meet the requirements of a power supply system on single or parallel coupling control modes and the requirements of long-time leakage current and over-discharge protection of a vehicle and the like.
Disclosure of Invention
In view of the above, in order to solve the above-mentioned deficiencies of the prior art, an object of the present invention is to provide a high-voltage power distribution unit for a vehicle-mounted compound power supply and a control method thereof, wherein a high redundancy of the system is achieved by independent control and parallel coupling of a compound power supply system loop, real-time state monitoring and fault diagnosis of the system are achieved by a high-voltage contactor feedback signal and a connector feedback signal, and high-safety and high-redundancy high-voltage power distribution and control of vehicles such as pure electric vehicles, hybrid electric vehicles, fuel cells, and the like, which are matched with a compound power supply, can be achieved.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a high-voltage power distribution unit for a vehicle-mounted composite power supply comprises a high-voltage connector P1+, P1-, P2+, P2-, DCDCDCDCIN +, DCDCDCDCOUT +, DCDCDCCOM-, MCU +, MCU-, Chn1, Chn2, Chn3, Chn4, a current sensor Sen1, Sen2, a fuse F1, F2, F3, F4, F5, F6, a contactor S1, S2, S3, S4, S5, S6, S7, S8, S9, a pre-charging resistor R1, R2, a high-voltage controller PCU, a sampling point T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12, T13, and T14;
the high-voltage connectors P1+ and P1-are respectively connected with the positive electrode and the negative electrode of a first power supply of the composite power supply system; the high-voltage connectors P2+ and P2-are respectively connected with the anode and the cathode of a second power supply of the composite power supply system; the high-voltage connectors DCDCDCDCIN +, DCDCDCOUT + and DCDCCOM-are respectively connected with the input positive electrode, the output positive electrode and the common negative electrode of the adapted direct-current voltage converter; the high-voltage connector MCU + and the MCU-are respectively connected with the anode and the cathode of the adaptive motor controller; the high-voltage connectors Chn1, Chn2, Chn3 and Chn4 are respectively connected with adaptive loads;
two ends of the current sensor Sen1 are respectively connected with a high-voltage connector P1+ and a fuse F1, and two ends of the current sensor Sen2 are respectively connected with a high-voltage connector P2+ and a contactor S3;
high voltage connector P2+ branch is the branch of charging and the branch road that discharges, charge the branch road with first end after the branch road that discharges connects in parallel is connected high voltage connector DCDCOUT +, charge the branch road with second end after the branch road that discharges connects in series connection in proper order fuse F2 and high voltage connector MCU +, the branch road that charges includes parallelly connected contactor S4, S5, the branch road that discharges includes parallelly connected fuse F3, F4, F5, F6.
Further, the fuse F1 realizes overcurrent protection of current flowing through a high-voltage connector P1+ loop; the fuse F2 realizes overcurrent protection of a circuit flowing through the MCU + loop of the high-voltage connector; the fuse F3 realizes overcurrent protection of current flowing through the high-voltage connector Chn 1; the fuse F4 realizes overcurrent protection of current flowing through the high-voltage connector Chn 2; the fuse F5 realizes overcurrent protection of current flowing through the high-voltage connector Chn 3; the fuse F6 provides overcurrent protection for the current flowing through the high-voltage connector Chn 4.
Further, the sampling point T1 is located between the fuse F1 and the contactor S1; sample point T2 is located between contactor S1 and high voltage connector dcdcdcin +; sample point T3 is located between contactor S3 and contactor S4; sample point T4 is located between contactor S4 and fuse F2; the sampling point T5 is positioned between the fuse F2 and the high-voltage connector MCU +; sample point T6 is located between contactor S6 and fuse F3; sample point T7 is located between contactor S7 and fuse F4; sample point T8 is located between contactor S8 and fuse F5; sample point T9 is located between contactor S9 and fuse F6; sample point T10 is located between fuse F3 and high voltage connector Chn 1; sample point T11 is located between fuse F4 and high voltage connector Chn 2; sample point T12 is located between fuse F5 and high voltage connector Chn 3; sample point T13 is located between fuse F6 and high voltage connector Chn 4; sample point T14 is located between high voltage connector P2+ and contactor S3.
Further, the contactor S1, the contactor S2 and the pre-charging resistor R1 realize the on-off and pre-charging control of a loop from a sampling point T1 to a sampling point T2; the contactor S4, the contactor S5 and the pre-charging resistor R2 realize the on-off and pre-charging control of a loop from a sampling point T3 to a sampling point T4; the contactor S3 realizes the on-off control of a loop from a high-voltage connector P2+ to a sampling point T3; the contactor S6 realizes the on-off control of a loop between a sampling point T3 and a sampling point T6; the contactor S7 realizes the on-off control of a loop between a sampling point T3 and a sampling point T7; the contactor S8 realizes the on-off control of a loop between a sampling point T3 and a sampling point T8; and the contactor S9 realizes the on-off control of the loop between the sampling point T3 and the sampling point T9.
The high-voltage controller PCU is an operation carrier for realizing a control method of a high-voltage power distribution unit, controls the contactors S1, S2, S3, S4, S5, S6, S7, S8 and S9, and acquires signal values of the current sensors Sen1 and Sen 2; collecting voltages of sampling points T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12 and T13; meanwhile, connection feedback signals of the high-voltage connector P1+, P1-, P2+, P2-, DCDCDCIN +, DCDCOUT +, DCDCDCCOM-, MCU +, Chn1, Chn2, Chn3 and Chn4 can be acquired.
A control method for a vehicle-mounted compound power supply high-voltage distribution unit comprises the following steps:
s1: through the connector state detection, the real-time state and fault state reporting is realized, and meanwhile, the judgment of the allowable closed state of the loop contactor is realized;
s2: the insulation resistance value of the shell is detected through the sampling point, so that the insulation state inspection and the insulation fault reporting of each loop are realized, and the allowable closed state judgment of the loop contactor is realized;
s3: when the PCU high-voltage controller receives a contactor closing instruction, closing the contactor when the corresponding contactor is in a closing permission state, otherwise, keeping the contactor disconnected;
s4: the method comprises the steps of sampling voltage, contactor action and high-voltage connector state through sampling points, judging and reporting states of a fuse and a contactor and judging faults, wherein the state identification of the contactor comprises four states of disconnection, connection, adhesion and failure of connection, and the state identification of the fuse comprises two states of normal and disconnection.
Further, in step S1, the connection state of the high-voltage connector is determined according to the high-voltage connector state feedback signal, when the high-voltage connector connection feedback signal is in the connection state, the contactor at the front end or the rear end of the connector is in a closing-allowed state, and if the high-voltage connector is in the disconnection state, the corresponding connector disconnection fault is reported, and the contactor at the front end or the rear end of the connector is disconnected.
Further, the connector detection program includes the steps of:
s11: when the high-voltage connector P1+, DCDCDCIN +, P2+, DCDCOUT +, P1-, P2-, DCDCCOM-is in a connection state and the fuse F1, the contactors S1, S2 and S3 are not in fault, the contactors S1, S2 and S3 are in a closing permission state, otherwise the contactors S1, S2 and S3 are forbidden to be closed;
s12: when the high-voltage connector MCU + and the MCU-are in a connection state and the contactors S4, S5 and the fuse F2 have no fault, the contactors S4 and S5 are in a closing allowing state, otherwise, the contactors S4 and S5 are forbidden to be closed;
s13: when the high-voltage connector Chn1 is in a connected state and the contactor S6 and the fuse F3 have no fault, the contactor S6 is in a closing-allowed state, otherwise, the contactor S6 is prohibited from being closed;
s14: when the high-voltage connector Chn2 is in a connected state and the contactor S7 and the fuse F4 have no fault, the contactor S7 is in a closing-allowed state, otherwise, the contactor S7 is prohibited from being closed;
s15: when the high-voltage connector Chn3 is in a connected state and the contactor S8 and the fuse F5 have no fault, the contactor S8 is in a closing-allowed state, otherwise, the contactor S8 is prohibited from being closed;
s16: when the high-voltage connector Chn4 is in the connection state and the contactor S9 and the fuse F6 are not in fault, the contactor S9 is in the closing-allowed state, otherwise the contactor S9 is prohibited from being closed.
Further, in step S1, the insulation state of the circuit in which the sampling point is located is determined by detecting the insulation resistance value between each sampling point and the housing, and when the insulation resistance value of a certain sampling point is lower than a set threshold, the corresponding circuit insulation fault is reported, and the circuit contactor in which the sampling point is located is disconnected.
Further, the insulation detection program includes the steps of:
s21: when the insulation resistance values of the sampling point T1 and the sampling point T2 are normal, the contactor S1 and the contactor S2 are in a closing-allowed state, otherwise, the contactor S2 is in a closing-forbidden state;
s22: when the insulation resistance values of the sampling point T14, the sampling point T3, the sampling point T4 and the sampling point T5 are all normal, the contactors S3 and S4 are in a closing-allowed state, and otherwise, the contactors S3 and S4 are in a closing-forbidden state;
s23: when the insulation resistance values of the sampling point T6 and the sampling point T10 are normal, the contactor S6 is in a closing-allowed state, and otherwise, the contactor S6 is in a closing-forbidden state;
s24: when the insulation resistance values of the sampling point T7 and the sampling point T11 are normal, the contactor S7 is in a closing-allowed state, and otherwise, the contactor S7 is in a closing-forbidden state;
s25: when the insulation resistance values of the sampling point T8 and the sampling point T12 are normal, the contactor S8 is in a closing-allowed state, and otherwise, the contactor S8 is in a closing-forbidden state;
s26: when the insulation resistance values of the sampling points T9 and T13 are normal, the contactor S9 is in a closing-allowed state, otherwise, the contactor S9 is in a closing-forbidden state.
The invention has the beneficial effects that:
the high-voltage power distribution unit for the vehicle-mounted composite power supply has double-loop single and parallel coupling control, has the functions of insulation detection and overcurrent protection, has the functions of detecting the states of a contactor fuse and a connector, and meets the requirements of electric power decoupling control, and the control method thereof.
According to the control method of the high-voltage power distribution unit for the vehicle-mounted compound power supply, the high redundancy of the system is realized through independent control and parallel coupling of the compound power supply system loop, the real-time state monitoring and fault diagnosis of the system are realized through the feedback signal of the high-voltage contactor, the feedback signal of the connector and the like, the system insulation detection is realized through the step-by-step power-on control of the system, and the functions of loop current detection and the like are also realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a circuit diagram of a vehicle-mounted compound power high voltage distribution unit of the present invention;
fig. 2 is a part 1 of a flowchart of a connector detection procedure in embodiment 2 of the present invention;
fig. 3 is a flowchart of part 2 of a connector detection procedure of embodiment 2 of the present invention;
fig. 4 is a part 3 of a flowchart of a connector detection procedure in embodiment 2 of the present invention;
fig. 5 is a part 4 of a flowchart of a connector detection procedure in embodiment 2 of the present invention;
fig. 6 is a part 5 of a flowchart of a connector detection procedure in embodiment 2 of the present invention;
fig. 7 is a part 6 of a flowchart of a connector detection procedure in embodiment 2 of the present invention;
fig. 8 is a flowchart of part 1 of an insulation detection procedure in embodiment 3 of the present invention;
fig. 9 is a flowchart of part 2 of an insulation detection procedure in embodiment 3 of the present invention;
fig. 10 is a flowchart of part 3 of an insulation detection procedure in embodiment 3 of the present invention;
fig. 11 is a flowchart of part 4 of an insulation detection procedure in embodiment 3 of the present invention;
fig. 12 is a flowchart of part 5 of an insulation detection procedure in embodiment 3 of the present invention;
fig. 13 is a flowchart of part 6 of an insulation detection procedure in embodiment 3 of the present invention;
FIG. 14 is a flow chart of part 1 of the contactor and fuse state identification process of embodiment 4 of the present invention;
FIG. 15 is a flow chart of part 2 of the contactor and fuse state identification process of embodiment 4 of the present invention;
FIG. 16 is a flow chart of the contactor and fuse state identification of embodiment 4 of the present invention, section 3;
FIG. 17 is a flow chart of part 4 of the contactor and fuse state identification process of embodiment 4 of the present invention;
FIG. 18 is a flow chart of a contactor and fuse state identification process of embodiment 4 of the present invention, section 5;
FIG. 19 is a flow chart portion 6 of contactor and fuse state identification according to embodiment 4 of the present invention;
FIG. 20 is a flow chart of part 7 of the contactor and fuse state identification process of embodiment 4 of the present invention;
FIG. 21 is a flow chart portion 8 of the contactor and fuse state identification according to embodiment 4 of the present invention;
FIG. 22 is a flow chart portion 9 of the contactor and fuse state identification of embodiment 4 of the present invention;
FIG. 23 is a flow chart portion 10 of contactor and fuse state identification according to embodiment 4 of the present invention;
FIG. 24 is a flow chart portion 11 of the contactor and fuse state identification according to embodiment 4 of the present invention;
fig. 25 is a flow chart portion 12 of contactor and fuse state identification according to embodiment 4 of the present invention.
Detailed Description
The following specific examples are given to further clarify, complete and detailed the technical solution of the present invention. The present embodiment is a preferred embodiment based on the technical solution of the present invention, but the scope of the present invention is not limited to the following embodiments.
Example one
Fig. 1 is an electrical schematic diagram of a high-voltage power distribution unit of a vehicle-mounted composite power supply according to a first embodiment of the present invention, and as shown in fig. 1, the high-voltage power distribution unit for the vehicle-mounted composite power supply includes a high-voltage connector P +, P-, DCDCIN +, dcdcdcout +, DCDCCOM-, MCU +, MCU-, Chn, a current sensor Sen, a fuse F, a contactor S, a pre-charging resistor R, a high-voltage controller PCU, a sampling point T, high-voltage copper bar, and a housing assembly;
the high-voltage connectors P1+ and P1-are respectively connected with the positive electrode and the negative electrode of a first power supply of the composite power supply system; the high-voltage connectors P2+ and P2-are respectively connected with the anode and the cathode of a second power supply of the composite power supply system; the high-voltage connectors DCDCDCDCIN +, DCDCDCOUT + and DCDCCOM-are respectively connected with the input positive electrode, the output positive electrode and the common negative electrode of the adapted direct-current voltage converter; the high-voltage connector MCU + and the MCU-are respectively connected with the anode and the cathode of the adaptive motor controller; the high-voltage connectors Chn1, Chn2, Chn3 and Chn4 are respectively connected with adaptive loads;
two ends of the current sensor Sen1 are respectively connected with a high-voltage connector P1+ and a fuse F1, and two ends of the current sensor Sen2 are respectively connected with a high-voltage connector P2+ and a contactor S3; the current sensor Sen1 measures the current flowing through the high-voltage copper bar of the high-voltage connector P1+ and the fuse F1, and preferably uses a hall current sensor; the current sensor Sen2 measures the current flowing through the high-voltage copper bar of the high-voltage connector P2+ and the contactor S3, and preferably uses a hall current sensor.
Further, the sampling point T1 is located between the fuse F1 and the contactor S1; sample point T2 is located between contactor S1 and high voltage connector dcdcdcin +; sample point T3 is located between contactor S3 and contactor S4; sample point T4 is located between contactor S4 and fuse F2; the sampling point T5 is positioned between the fuse F2 and the high-voltage connector MCU +; sample point T6 is located between contactor S6 and fuse F3; sample point T7 is located between contactor S7 and fuse F4; sample point T8 is located between contactor S8 and fuse F5; sample point T9 is located between contactor S9 and fuse F6; sample point T10 is located between fuse F3 and high voltage connector Chn 1; sample point T11 is located between fuse F4 and high voltage connector Chn 2; sample point T12 is located between fuse F5 and high voltage connector Chn 3; sample point T13 is located between fuse F6 and high voltage connector Chn 4; sample point T14 is located between high voltage connector P2+ and contactor S3.
Further, the contactor S1, the contactor S2 and the pre-charging resistor R1 realize the on-off and pre-charging control of a loop from the sampling point T1 to the sampling point T2; the contactor S4, the contactor S5 and the pre-charging resistor R2 realize the on-off and pre-charging control of a loop from a sampling point T3 to a sampling point T4; the contactor S3 realizes the on-off control of a loop from a high-voltage connector P2+ to a sampling point T3; the contactor S6 realizes the on-off control of a loop between a sampling point T3 and a sampling point T6; the contactor S7 realizes the on-off control of a loop between a sampling point T3 and a sampling point T7; the contactor S8 realizes the on-off control of a loop between a sampling point T3 and a sampling point T8; and the contactor S9 realizes the on-off control of the loop between the sampling point T3 and the sampling point T9.
Furthermore, the PCU is an operation carrier for realizing the control method of the high-voltage power distribution unit, receives control signals from the outside, executes strategy operation, and reports acquired state signals; preferably, a CAN bus is used for communicating with the outside; the high-voltage controller PCU realizes the control of the contactors S1, S2, S3, S4, S5, S6, S7, S8 and S9, and acquires the signal values of the current sensors Sen1 and Sen 2; collecting voltages of sampling points T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12 and T13; meanwhile, connection feedback signals of the high-voltage connector P1+, P1-, P2+, P2-, DCDCDCIN +, DCDCOUT +, DCDCDCCOM-, MCU +, Chn1, Chn2, Chn3 and Chn4 can be acquired. The high-voltage controller PCU can further realize insulation resistance values from a sampling point T1, a sampling point T2, a sampling point T3, a sampling point T4, a sampling point T5, a sampling point T6, a sampling point T7, a sampling point T8, a sampling point T9, a sampling point T10, a sampling point T11, a sampling point T12, a sampling point T13 to the shell assembly.
The contactor, the fuse, the current sensor, the PCU, the high-voltage copper bar and the like are positioned in the shell assembly, the high-voltage protection and electromagnetic shielding effects are achieved, and a metal shell is preferably used.
A control method for a vehicle-mounted compound power supply high-voltage distribution unit comprises the following steps:
s1: and the real-time state and fault state reporting is realized through the connector state detection, and the allowable closed state judgment of the loop contactor is realized at the same time.
Further, in step S1, the connection state of the high-voltage connector is determined according to the high-voltage connector state feedback signal, when the high-voltage connector connection feedback signal is in the connection state, the contactor at the front end or the rear end of the connector is in a closing-allowed state, and if the high-voltage connector is in the disconnection state, the corresponding connector disconnection fault is reported, and the contactor at the front end or the rear end of the connector is disconnected;
further, the connector detection program includes the steps of: when the high-voltage connector P1+, DCDCDCIN +, P2+, DCDCOUT +, P1-, P2-, DCDCCOM-is in a connection state and the fuse F1, the contactors S1, S2 and S3 are not in fault, the contactors S1, S2 and S3 are in a closing permission state, otherwise the contactors S1, S2 and S3 are forbidden to be closed; when the high-voltage connector MCU + and the MCU-are in a connection state and the contactors S4, S5 and the fuse F2 have no fault, the contactors S4 and S5 are in a closing allowing state, otherwise, the contactors S4 and S5 are forbidden to be closed; when the high-voltage connector Chn1 is in a connected state and the contactor S6 and the fuse F3 have no fault, the contactor S6 is in a closing-allowed state, otherwise, the contactor S6 is prohibited from being closed; when the high-voltage connector Chn2 is in a connected state and the contactor S7 and the fuse F4 have no fault, the contactor S7 is in a closing-allowed state, otherwise, the contactor S7 is prohibited from being closed; when the high-voltage connector Chn3 is in a connected state and the contactor S8 and the fuse F5 have no fault, the contactor S8 is in a closing-allowed state, otherwise, the contactor S8 is prohibited from being closed; when the high-voltage connector Chn4 is in the connection state and the contactor S9 and the fuse F6 are not in fault, the contactor S9 is in the closing-allowed state, otherwise the contactor S9 is prohibited from being closed.
Further, in step S1, the insulation state of the circuit in which the sampling point is located is determined by detecting the insulation resistance value between each sampling point and the housing, and when the insulation resistance value of a certain sampling point is lower than a set threshold, the corresponding circuit insulation fault is reported, and the circuit contactor in which the sampling point is located is disconnected;
further, the insulation detection program includes the steps of:
when the insulation resistance values of the sampling point T1 and the sampling point T2 are normal, the contactor S1 and the contactor S2 are in a closing-allowed state, otherwise, the contactor S2 is in a closing-forbidden state; when the insulation resistance values of the sampling point T14, the sampling point T3, the sampling point T4 and the sampling point T5 are normal, the contactors S3 and S4 are in a closing-allowed state, and otherwise, the contactors S3 and S4 are in a closing-forbidden state; when the insulation resistance values of the sampling point T6 and the sampling point T10 are normal, the contactor S6 is in a closing-allowed state, and otherwise, the contactor S6 is in a closing-forbidden state; when the insulation resistance values of the sampling point T7 and the sampling point T11 are normal, the contactor S7 is in a closing-allowed state, and otherwise, the contactor S7 is in a closing-forbidden state; when the insulation resistance values of the sampling point T8 and the sampling point T12 are normal, the contactor S8 is in a closing-allowed state, and otherwise, the contactor S8 is in a closing-forbidden state; when the insulation resistance values of the sampling points T9 and T13 are normal, the contactor S9 is in a closing-allowed state, otherwise, the contactor S9 is in a closing-forbidden state.
S2: the insulation resistance value of the shell is detected through the sampling point, the insulation state inspection and the insulation fault reporting of each loop are realized, and the allowable closed state judgment of the loop contactor is realized.
S3: when the PCU high-voltage controller receives a contactor closing command, when the corresponding contactor is in a closing permission state, the contactor is closed, otherwise, the contactor is kept open.
S4: the method comprises the steps of sampling voltage, contactor action and high-voltage connector state through sampling points, judging and reporting states of a fuse and a contactor and judging faults, wherein the state identification of the contactor comprises four states of disconnection, connection, adhesion and failure of connection, and the state identification of the fuse comprises two states of normal and disconnection.
Further, in step S4, when the P1+ connector state is connected and the sampling point T1 is consistent with the voltage of the power supply 1, it is determined that the fuse F1 state is normal, and the contactor S1 and the contactor S2 are allowed to be closed, otherwise, the fuse F1 is in an open state, and the contactor S1 and the contactor S2 are prohibited to be closed;
keeping the contactor S2 open, when the contactor S1 is closed and the voltage of the sampling point T2 is consistent with that of the sampling point T1, determining that the contactor S1 is in a closed state, and when the voltage of the sampling point T2 is not consistent with that of the sampling point T1, determining that the contactor S1 is in a failed closed state; when the contactor S1 is disconnected and the voltages of the sampling point T2 and the sampling point T1 are not consistent, the contactor S1 is judged to be in a disconnected state, and when the voltages of the sampling point T2 and the sampling point T1 are consistent, the contactor S1 is judged to be adhered;
keeping the contactor S1 open, when the contactor S2 is closed and the voltage of the sampling point T2 is consistent with that of the sampling point T1, determining that the contactor S2 is in a closed state, and when the voltage of the sampling point T2 is not consistent with that of the sampling point T1, determining that the contactor S2 is in a failed closed state; when the contactor S2 is disconnected and the voltages of the sampling point T2 and the sampling point T1 are not consistent, the contactor S2 is judged to be in a disconnected state, and when the voltages of the sampling point T2 and the sampling point T1 are consistent, the contactor S2 is judged to be adhered;
when the contactor S3 is disconnected, and the voltage of the sampling point T3 is consistent with the voltage of the DCDC output end and is inconsistent with the voltage of the power supply 2, judging that the contactor S3 is in a disconnected state, and if the voltage of the sampling point T3 is consistent with the voltage of the DCDC output end and the voltage of the power supply 2, judging that the contactor S3 is in an adhesion state; when the contactor S3 is closed, and the voltage of the sampling point T3 is consistent with the voltage of the DCDC output end and is inconsistent with the voltage of the power supply 2, judging that the contactor S3 fails to be closed, and if the voltage of the sampling point T3 is consistent with the voltage of the DCDC output end and the voltage of the power supply 2, judging that the contactor S3 is in a closed state;
keeping the contactor S5 in an open state, when the contactor S4 is closed and the voltage of the sampling point T3 is consistent with that of the sampling point T4, determining that the contactor S4 is in a closed state, and at the moment, if the voltage of the sampling point T3 is not consistent with that of the sampling point T4, determining that the contactor S4 is in a failed closed state; when the contactor S4 is disconnected and the voltage of the sampling point T3 is not consistent with the voltage of the sampling point T4, judging that the contactor S4 is in a disconnected state, and if the voltage of the sampling point T3 is consistent with the voltage of the sampling point T4, judging that the contactor S4 is in adhesion;
keeping the contactor S4 in an open state, when the contactor S5 is closed and the voltage of the sampling point T3 is consistent with that of the sampling point T4, determining that the contactor S5 is in a closed state, and at the moment, if the voltage of the sampling point T3 is not consistent with that of the sampling point T4, determining that the contactor S5 is in a failed closed state; when the contactor S5 is disconnected and the voltage of the sampling point T3 is not consistent with the voltage of the sampling point T4, judging that the contactor S5 is in a disconnected state, and at the moment, if the voltage of the sampling point T3 is consistent with the voltage of the sampling point T4, judging that the contactor S5 is in adhesion;
when the voltage of the sampling point T4 is consistent with that of the sampling point T5, the state of the fuse F2 is judged to be normal, otherwise, the fuse F2 is in a disconnected state; when the contactor S6 is in a closed state, and the voltage of the sampling point T3 is consistent with that of the sampling point T6, the contactor S6 is in a closed state, and if the voltage of the sampling point T3 is not consistent with that of the sampling point T6, the contactor S6 fails to be closed; when the contactor S6 is in an open state, and the voltage of the sampling point T3 is consistent with that of the sampling point T6, the contactor S6 is in an adhesion state, and if the voltage of the sampling point T3 is not consistent with that of the sampling point T6, the contactor S6 is in an open state;
when the contactor S7 is in a closed state, and the voltage of the sampling point T3 is consistent with that of the sampling point T7, the contactor S7 is in a closed state, and if the voltage of the sampling point T3 is not consistent with that of the sampling point T7, the contactor S7 fails to be closed; when the contactor S7 is in an open state, and the voltage of the sampling point T3 is consistent with that of the sampling point T7, the contactor S7 is in an adhesion state, and if the voltage of the sampling point T3 is not consistent with that of the sampling point T7, the contactor S7 is in an open state;
when the contactor S8 is in a closed state, and the voltage of the sampling point T3 is consistent with that of the sampling point T8, the contactor S8 is in a closed state, and if the voltage of the sampling point T3 is not consistent with that of the sampling point T8, the contactor S8 fails to be closed; when the contactor S8 is in an open state, and the voltage of the sampling point T3 is consistent with that of the sampling point T8, the contactor S8 is in an adhesion state, and if the voltage of the sampling point T3 is not consistent with that of the sampling point T8, the contactor S8 is in an open state;
when the contactor S9 is in a closed state and the voltage at the sampling point T3 is consistent with the voltage at the sampling point T9, the contactor S9 is in a closed state, and if the voltage at the sampling point T3 is inconsistent with the voltage at the sampling point T9, the contactor S9 fails to close; when the contactor S9 is in an open state, and the voltage of the sampling point T3 is consistent with that of the sampling point T9, the contactor S9 is in an adhesion state, and if the voltage of the sampling point T3 is not consistent with that of the sampling point T9, the contactor S9 is in an open state;
when the voltage of the sampling point T6 is consistent with that of the sampling point T10, the state of the fuse F3 is judged to be normal, otherwise, the fuse F3 is in a disconnected state; when the voltage of the sampling point T7 is consistent with that of the sampling point T11, the state of the fuse F4 is judged to be normal, otherwise, the fuse F4 is in a disconnected state; when the voltage of the sampling point T8 is consistent with that of the sampling point T12, the state of the fuse F5 is judged to be normal, otherwise, the fuse F5 is in a disconnected state; when the voltage of the sampling point T9 is consistent with that of the sampling point T13, the state of the fuse F6 is judged to be normal, otherwise, the fuse F3 is in an off state.
Example two
Fig. 2 is a flowchart of a connector detection procedure in a control method for a high-voltage distribution unit of a vehicle-mounted compound power supply according to a second embodiment of the present invention, where real-time status and fault status reporting are realized through connector status detection, and a loop contactor allowed closed status determination is realized at the same time.
And judging the connection state of the high-voltage connector through the high-voltage connector state feedback signal, reporting a disconnection fault of the corresponding connector when the high-voltage connector connection feedback signal is in a disconnection state, and disconnecting the connector at the front end or the rear end of the connector.
As shown in fig. 2 to 7, the technical solution of the embodiment of the present invention specifically includes the following steps:
s210, detecting the states of the high-voltage connector P1+, DCDCIN +, P2+, DCDCOUT +, P1-, P2-and DCDCCOM-.
S220, detecting whether the high-voltage connector P1+, DCDCIN +, P2+, DCDCOUT +, P1-, P2-or DCDCCOM-is in a connection state. If the connection state is determined, S230 is executed; if not, S240 is executed.
S230, detecting whether the fuses F1, S1, S2 and S3 have no fault. If no fault exists, executing S250; if there is a failure, S240 is executed.
S240, determining that the contactor S1, the contactor S2 and the contactor S3 are in a closing prohibition state.
S250, judging that the contactor S1, the contactor S2 and the contactor S3 are in a closing permission state.
And S260, detecting the states of the high-voltage connector MCU + and the high-voltage connector MCU-.
And S270, detecting whether the high-voltage connector MCU + and the high-voltage connector MCU-are in a connection state. If yes, go to step S280; if not, S290 is executed.
And S280, detecting whether the contactor S4, the contactor S5 and the fuse F2 have no fault. If no fault exists, executing S2100; if there is a failure, S290 is executed.
S290, determining that the contactor S4 and the contactor S5 are in a closing prohibition state.
S2100, judging that the contactor S4 and the contactor S5 are in a closing permission state.
And S2110, detecting the state of the high-voltage connector Chn 1.
S2120, it is detected whether or not the high voltage connector Chn1 is in a connected state. If the connection state is the connection state, executing S2130; if not, S2140 is executed.
S2130, detecting whether the contactor S6 and the fuse F3 have no fault. If not, executing S2150; if there is a failure, S2140 is performed.
S2140, determines that the contactor S6 is in the closing prohibition state.
S2150, determines that the contactor S6 is in the closing permission state.
S2160, detecting the status of the high voltage connector Chn 2.
S2170, whether the high-voltage connector Chn2 is in a connection state is detected. If the connection state is determined, executing step S2180; if not, S2190 is executed.
S2180, detecting whether the contactor S7 and the fuse F4 have no fault. If not, executing S2200; if there is a failure, S2190 is executed.
S2190, determines that the contactor S7 is in the closing prohibition state.
S2200, determining that the contactor S7 is in the closing permission state.
S2210, detecting the state of the high-voltage connector Chn 3.
S2220, whether the high-voltage connector Chn3 is in the connection state or not is detected. If the connection state is determined, S2230 is executed; if not, go to step S2240.
S2230, detecting whether the contactor S8 and the fuse F5 have no fault. If not, executing S2250; if there is a fault, S2240 is executed.
S2240 determines that the contactor S8 is in the closing prohibition state.
S2250, contactor S8 is determined to be in the allowed closed state.
S2260, detecting the state of the high voltage connector Chn 4.
S2270, it is detected whether the high voltage connector Chn4 is in the connected state. If the connection state is the connection state, executing S2280; if not, S2290 is executed.
S2280, whether the contactor S9 and the fuse F6 have no fault is detected. If not, executing S2300; if there is a failure, S2290 is executed.
S2290, determining that the contactor S9 is in the closing prohibition state.
S2300, judging that the contactor S9 is in a closing permission state.
EXAMPLE III
Fig. 8 to 13 are flowcharts of an insulation detection procedure in a control method of a high-voltage distribution unit of a vehicle-mounted compound power supply according to a third embodiment of the present invention. The insulation resistance value of the shell is detected through the sampling point, the insulation state inspection and the insulation fault reporting of each loop are realized, and the allowable closed state judgment of the loop contactor is realized.
And judging the insulation state of a loop where the sampling points are located by detecting the insulation resistance value between each sampling point and the shell, reporting the insulation fault of the corresponding loop when the insulation resistance value of a certain sampling point is lower than a set threshold value, and disconnecting the loop contactor where the sampling point is located.
As shown in fig. 3, the technical solution of the embodiment of the present invention specifically includes the following steps:
s310, detecting the insulation resistance value between the T1 and the shell, and sampling the T2.
S320, detecting whether the insulation resistance values sampled by the sampling points T1 and T2 are normal or not. If normal, go to S340; if not, go to step S330.
S330, determining that the contactor S1 and the contactor S2 are in a closing prohibition state.
S340, judging that the contactor S1 and the contactor S2 are in a closing permission state.
S350, detecting insulation resistance values between the sampling points T14, T3, T4 and T5 and the shell.
S360, detecting whether insulation resistance values of the sampling points T14, T3, T4 and T5 are normal or not. If the result is normal, executing S380; if not, S370 is executed.
S370, determining that the contactor S3 and the contactor S4 are in a closing prohibition state.
S380, judging the contactor S3 and the contactor S4 to be in a closing permission state.
And S390, detecting the insulation resistance value between the T6 and the sampling point T10 and the shell.
S3100, detecting whether the insulation resistance values sampled by the sampling points T6 and T10 are normal or not. If the result is normal, executing S3120; if not, S3110 is executed.
S3110, determining that the contactor S6 is in the closing prohibition state.
And S3120, judging that the contactor S6 is in a closing permission state.
S3130, detecting T7, and sampling point T11.
S3140, detecting whether the insulation resistance values sampled by the sampling points T7 and T11 are normal or not. If so, executing S3160; if not, S3150 is executed.
S3150, the contactor S7 is determined to be in the closing prohibition state.
S3160, determine that the contactor S7 is in the closing permission state.
S3170, detecting T8, and sampling point T12 and the insulation resistance value between the shell.
S3180, detecting whether the insulation resistance values of the sampling points T8 and T12 are normal. If so, executing S3220; if not, S3190 is executed.
S3190, the contactor S8 is determined to be in the closing prohibition state.
S3220, determining that the contactor S8 is in the closing permission state.
S3210, detecting T9, and sampling point T13 and the insulation resistance value between the shell.
S3220, and detecting whether the sampling points T9 and T13 sample the insulation resistance values normally. If normal, execute S3240, if abnormal, execute S3230.
And S3230, determining that the contactor S9 is in a closing permission state.
S3240, determining that the contactor S9 is in the closing prohibition state.
Example four
Fig. 14 to 25 are flowcharts illustrating a state recognition of a contactor and a fuse in a control method for a high-voltage power distribution unit of a vehicle-mounted composite power supply according to a third embodiment of the present invention. The method comprises the steps of sampling voltage, contactor action, high-voltage connector state and the like through sampling points, judging and reporting states of a fuse and a contactor and judging faults, wherein the states of the contactor are identified as open, closed, adhered and closed failure, and the states of the fuse are identified as normal and open.
As shown in fig. 4, the technical solution of the embodiment of the present invention specifically includes the following steps:
s410, detecting the state of the P1+ connector, and detecting a sampling point T1 and the voltage of the power supply 1.
S420, detecting whether the P1+ connector state is a connection state. If the connection status is the connection status, S430 is executed, and if the connection status is not the connection status, S440 is executed.
S430, detecting whether the sampling point T1 is consistent with the voltage of the power supply 1. If yes, S450 is performed, and if not, S440 is performed.
S440, determining that the fuse F1 is in an open state, and prohibiting the contacts S1 and S2 from closing.
S450, judging that the state of the fuse F1 is normal, and allowing the contactor S1 and the contactor S2 to be closed.
S460, keeping the contactor S2 open.
And S470, detecting whether the contactor S1 is closed. If closed, go to S490; if not, S4100 is performed.
And S480, judging that the contactor S1 is in a closing failure state.
And S490, detecting whether the voltage of the sampling point T2 is consistent with that of the sampling point T1. If yes, executing S4120; if not, go to step S480.
S4100, detecting whether the voltage of the sampling point T2 is consistent with that of the sampling point T1. If yes, executing S4130; if not, execute S4110.
S4110, determine that the contactor S1 is in an open state.
S4120, determination contactor S1 is in the closed state.
S4130, judging that the contactor S1 is in a stuck state.
S4140, keep contactor S1 open.
And S4150, detecting whether the contactor S2 is closed. If closed, executing S4170; if not, S4160 is performed.
S4160, determine contactor S2 as a failed closed state.
S4170, detecting whether the voltage of the sampling point T2 is consistent with that of the sampling point T1. If yes, executing S4200; if not, S4160 is executed.
S4180, detecting whether the voltage of the sampling point T2 is consistent with that of the sampling point T1. If yes, executing S4210; if not, S4190 is executed.
S4190, determine that the contactor S2 is in the open state.
S4200, determines that the contactor S2 is closed.
And S4210, judging that the contactor S2 is in an adhesion state.
S4220, keeping the contactor S3 disconnected, and enabling the voltage of the sampling point T3 to be consistent with the voltage of the DCDC output end.
And S4230, keeping the contactor S3 closed, and enabling the voltage of the sampling point T3 to be consistent with the voltage of the DCDC output terminal.
S4240, determining that the contactor S3 is in the open state.
S4250, detecting whether the voltage of the sampling point T3 is consistent with the voltage of the power supply 2. If yes, executing S4280; if not, S4240 is executed.
S4260, detecting whether the voltage of the sampling point T3 is consistent with the voltage of the power supply 2. If yes, executing S4290; if not, S4270 is executed.
S4270, determining contactor S3 as a failed close state.
And S4280, judging that the contactor S3 is in the adhesion state.
S4290, determining that the contactor S3 is in the closed state.
S4300, keep contactor S5 open.
S4310, detecting whether the contactor S4 is closed. If closed, executing S4330; if not, go to S4340.
S4320, determine contactor S4 as a failed closed state.
S4330, whether the voltage of the sampling point T3 is consistent with that of the sampling point T4 is detected. If yes, executing S4360; if not, go to S4320.
S4340, whether the voltage of the sampling point T3 is consistent with that of the sampling point T4 is detected. If yes, executing S4370; if not, go to S4350.
S4350, determine that the contactor S4 is in an open state.
S4360, determine that the contactor S4 is in the closed state.
S4370, judging that the contactor S4 is in a stuck state.
S4380, keep contactor S4 open.
S4390, detecting whether the contactor S5 is closed. If closed, execute S4410; if not, S4420 is performed.
S4400, determine that the contactor S5 is in a failed close state.
S4410, detecting whether the voltage at the sampling point T3 is consistent with that at the sampling point T4. If yes, go to S4440; if not, execute S4400.
S4420, detecting whether the voltage at the sampling point T3 is consistent with that at the sampling point T4. If yes, go to S4450; if not, S4430 is performed.
S4430, determining that the contactor S5 is in an open state.
S4440, determining that the contactor S5 is in a closed state.
S4450, determining that the contactor S5 is in the stuck state.
S4460, detecting the voltage at sampling point T4 and sampling point T5.
S4470, detecting whether the voltage of the sampling point T4 is consistent with that of the sampling point T5. If yes, executing S4490; if not, S4480 is performed.
S4480, determine fuse F2 to be in the open state.
And S4490, judging that the state of the fuse F2 is normal.
S4500, detecting the state of the contactor S6.
S4510, and detecting whether the contactor S6 is closed. If closed, executing S4530; if not, S4540 is performed.
S4520, and determines that the contactor S6 is in a failure to close state.
S4530, and whether the voltage of the sampling point T3 is consistent with that of the sampling point T6 is detected. If yes, executing S4560; if not, S4520 is executed.
S4540, whether the voltage of the sampling point T3 is consistent with that of the sampling point T6 is detected. If yes, executing S4570; if not, S4550 is executed.
S4550, and determines that the contactor S6 is in the open state.
S4560, and determines that the contactor S6 is in the closed state.
S4570, and judging that the contactor S6 is in a stuck state.
And S4580, and detecting the state of the contactor S7.
S4590, detecting whether the contactor S7 is closed. If closed, perform S4610; if not, S4620 is performed.
S4600, determine contactor S7 as a failed close state.
S4610, whether the voltage at the sampling point T3 is consistent with that at the sampling point T7 is detected. If yes, executing S4640; if not, S4600 is executed.
S4620, whether the voltage at the sampling point T3 is consistent with that at the sampling point T7 is detected. If yes, executing S4650; if not, then S4630 is performed.
S4630, and determines that the contactor S7 is in the open state.
S4640, and determines that the contactor S7 is in the closed state.
S4650, judging that the contactor S7 is in a stuck state.
S4660, detecting the state of the contactor S8.
S4670, detecting whether the contactor S8 is closed. If closed, perform S4690; if not, then S4700 is performed.
S4680, the contactor S8 is judged to be in a closing failure state.
S4690, whether the voltage at the sampling point T3 is consistent with the voltage at the sampling point T8 is detected. If yes, go to S4720; if not, then S4680 is performed.
S4700, whether the voltage of the sampling point T3 is consistent with that of the sampling point T8 is detected. If yes, go to S4730; if not, S4710 is executed.
S4710, and determines that the contactor S8 is in an open state.
S4720, determine contactor S8 is closed.
S4730, judging that the contactor S8 is in a stuck state.
S4740, detecting the state of the contactor S9.
S4750, detecting whether the contactor S9 is closed. If closed, go to S4770; if not, S4780 is performed.
S4760, determine contactor S9 as a failed closed state.
S4770, detecting whether the voltage of the sampling point T3 is consistent with that of the sampling point T9. If yes, executing S4800; if not, S4760 is executed.
S4780, whether the voltage of the sampling point T3 is consistent with that of the sampling point T9 is detected. If yes, executing S4810; if not, S4790 is executed.
S4790, and determines that the contactor S9 is in the open state.
And S4800, judging that the contactor S9 is in a closed state.
And S4810, judging that the contactor S9 is in a stuck state.
S4820, detecting a sampling point T6 and a sampling point T10 voltage.
And S4830, detecting whether the voltage at the sampling point T6 is consistent with the voltage at the sampling point T10. If yes, executing S4850; if not, go to step S4840.
S4840, determining fuse F3 to be in the open state.
And S4850, judging that the state of the fuse F3 is normal.
S4860, detecting a sampling point T7 and a sampling point T11 voltage.
And S4870, detecting whether the voltages at the sampling point T7 and the sampling point T11 are consistent or not. If yes, executing S4890; if not, S4880 is executed.
S4880, determining fuse F4 to be in an open state.
And S4890, judging that the state of the fuse F4 is normal.
S4900, detecting a sampling point T8 and a sampling point T12 voltage.
S4910, whether the voltage of the sampling point T8 is consistent with that of the sampling point T12 is detected. If yes, go to S4930; if not, S4920 is executed.
S4920, determining fuse F5 to be in an open state.
S4930, judging that the state of the fuse F5 is normal.
S4940, detecting a sampling point T9 and a sampling point T13 voltage.
S4950, whether the voltage of the sampling point T9 is consistent with that of the sampling point T13 is detected. If yes, execute S4970; if not, S4960 is executed.
S4960, determining fuse F6 to be in an open state.
S4970, judging the state of the fuse F6 to be normal.
In summary, according to the high-voltage power distribution unit for the vehicle-mounted composite power supply and the control method thereof, the high redundancy of the system is realized by independent control and parallel coupling of the composite power supply system loop, the real-time state monitoring and fault diagnosis of the system are realized by the feedback signal of the high-voltage contactor and the feedback signal of the connector, the system insulation detection is realized by the step-by-step power-on control of the system, and the functions of loop current detection and the like are realized; the technical scheme can realize high-safety and high-redundancy high-voltage power distribution and control of vehicles such as pure electric vehicles, hybrid power vehicles, fuel cells and the like matched with the composite power supply.
The principal features, principles and advantages of the invention have been shown and described above. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to explain the principles of the invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the invention as expressed in the following claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. The utility model provides a high voltage distribution unit for on-vehicle combined power supply which characterized in that: the high-voltage power supply comprises high-voltage connectors P1+, P1-, P2+, P2-, DCDCDCIN +, DCDCDCOUT +, DCDCCOM-, MCU +, MCU-, Chn1, Chn2, Chn3, Chn4, current sensors Sen1, Sen2, fuses F1, F2, F3, F4, F5, F6, contactors S1, S2, S3, S4, S5, S6, S7, S8, S9, pre-charging resistors R1, R2, a high-voltage controller PCU and a plurality of sampling points for collecting voltage values;
the high-voltage connectors P1+ and P1-are respectively connected with the positive electrode and the negative electrode of a first power supply of the composite power supply system; the high-voltage connectors P2+ and P2-are respectively connected with the anode and the cathode of a second power supply of the composite power supply system; the high-voltage connectors DCDCDCDCIN +, DCDCDCOUT + and DCDCCOM-are respectively connected with the input positive electrode, the output positive electrode and the common negative electrode of the adapted direct-current voltage converter; the high-voltage connector MCU + and the MCU-are respectively connected with the anode and the cathode of the adaptive motor controller; the high-voltage connectors Chn1, Chn2, Chn3 and Chn4 are respectively connected with adaptive loads;
two ends of the current sensor Sen1 are respectively connected with a high-voltage connector P1+ and a fuse F1, and two ends of the current sensor Sen2 are respectively connected with a high-voltage connector P2+ and a contactor S3; high voltage connector P2+ branch is the branch of charging and the branch road that discharges, charge the branch road with first end after the branch road that discharges connects in parallel is connected high voltage connector DCDCOUT +, charge the branch road with second end after the branch road that discharges connects in series connection in proper order fuse F2 and high voltage connector MCU +, the branch road that charges includes parallelly connected contactor S4, S5, the branch road that discharges includes parallelly connected fuse F3, F4, F5, F6.
2. The high-voltage power distribution unit for the vehicle-mounted compound power supply according to claim 1, characterized in that: the fuse F1 realizes overcurrent protection of current flowing through a high-voltage connector P1+ loop; the fuse F2 realizes overcurrent protection of a circuit flowing through the MCU + loop of the high-voltage connector; the fuse F3 realizes overcurrent protection of current flowing through the high-voltage connector Chn 1; the fuse F4 realizes overcurrent protection of current flowing through the high-voltage connector Chn 2; the fuse F5 realizes overcurrent protection of current flowing through the high-voltage connector Chn 3; the fuse F6 provides overcurrent protection for the current flowing through the high-voltage connector Chn 4.
3. The high-voltage power distribution unit for the vehicle-mounted compound power supply according to claim 1, characterized in that: sampling points include T1, T2, T3, T4, sampling point T4 between fuse F4 and contactor S4, sampling point T4 between contactor S4 and high-voltage connector dcin +, sampling point T4 between contactor S4 and contactor S4, sampling point T4 between contactor S4 and fuse F4, sampling point T4 between fuse F4 and high-voltage connector MCU +, sampling point T4 between contactor S4 and fuse F4, sampling point T4 between contactor S4 and fuse F4, sampling point T4 between fuse F4 and high-voltage connector 4, and high-voltage connector Chn4 between fuse F4, and high-voltage connector Chn4, and high-voltage connector F4, sample point T13 is located between fuse F6 and high voltage connector Chn 4; sample point T14 is located between high voltage connector P2+ and contactor S3.
4. The high-voltage power distribution unit for the vehicle-mounted compound power supply according to claim 3, characterized in that: the contactor S1, the contactor S2 and the pre-charging resistor R1 realize the on-off and pre-charging control of a loop from a sampling point T1 to a sampling point T2; the contactor S4, the contactor S5 and the pre-charging resistor R2 realize the on-off and pre-charging control of a loop from a sampling point T3 to a sampling point T4; the contactor S3 realizes the on-off control of a loop from a high-voltage connector P2+ to a sampling point T3; the contactor S6 realizes the on-off control of a loop from a sampling point T3 to a sampling point T6; the contactor S7 realizes the on-off control of a loop between a sampling point T3 and a sampling point T7; the contactor S8 realizes the on-off control of a loop between a sampling point T3 and a sampling point T8; and the contactor S9 realizes the on-off control of the loop between the sampling point T3 and the sampling point T9.
5. The high-voltage power distribution unit for the vehicle-mounted compound power supply according to claim 3, characterized in that: the high-voltage controller PCU is an operation carrier for realizing a control method of a high-voltage power distribution unit, the high-voltage controller PCU realizes control of the contactors S1, S2, S3, S4, S5, S6, S7, S8 and S9, acquires signal values of the current sensors Sen1 and Sen2, and acquires voltages of sampling points T1, T2, T3, T4, T5, T6, T7, T8, T9, T10, T11, T12 and T13; meanwhile, connection feedback signals of the high-voltage connector P1+, P1-, P2+, P2-, DCDCDCIN +, DCDCOUT +, DCDCDCCOM-, MCU +, Chn1, Chn2, Chn3 and Chn4 can be acquired.
6. The vehicle-mounted compound power supply high-voltage power distribution unit control method according to any one of claims 1 to 5, characterized in that: the method comprises the following steps:
s1: through the connector state detection, the real-time state and fault state reporting is realized, and meanwhile, the judgment of the allowable closed state of the loop contactor is realized;
s2: the detection of the insulation resistance value of the shell is realized through the sampling point, the insulation state detection and the insulation fault reporting of each loop are realized, and the judgment of the allowable closed state of the loop contactor is realized;
s3: when the PCU high-voltage controller receives a contactor closing instruction, closing the contactor when the corresponding contactor is in a closing permission state, and otherwise, keeping the contactor open;
s4: the method comprises the steps of sampling voltage, contactor action and high-voltage connector state through sampling points, judging and reporting states of a fuse and a contactor and judging faults, wherein the state identification of the contactor comprises four states of disconnection, connection, adhesion and failure of connection, and the state identification of the fuse comprises two states of normal and disconnection.
7. The vehicle-mounted compound power supply high-voltage power distribution unit control method according to claim 6, characterized in that: in the step S1, the connection state of the high-voltage connector is determined according to the high-voltage connector state feedback signal, when the high-voltage connector connection feedback signal is in the connection state, the contactor at the front end or the rear end of the connector is in a state allowing closing, and if the high-voltage connector is in the disconnection state, the corresponding connector disconnection fault is reported, and the contactor at the front end or the rear end of the connector is disconnected.
8. The vehicle-mounted compound power supply high-voltage distribution unit control method according to claim 7, characterized in that: the connector detection program includes the steps of:
s11: when the high-voltage connector P1+, DCDCDCIN +, P2+, DCDCOUT +, P1-, P2-, DCDCCOM-is in a connection state and the fuse F1, the contactors S1, S2 and S3 are not in fault, the contactors S1, S2 and S3 are in a closing permission state, otherwise the contactors S1, S2 and S3 are forbidden to be closed;
s12: when the high-voltage connector MCU + and the MCU-are in a connection state and the contactors S4, S5 and the fuse F2 have no fault, the contactors S4 and S5 are in a closing allowing state, otherwise, the contactors S4 and S5 are forbidden to be closed;
s13: when the high-voltage connector Chn1 is in a connection state and the contactor S6 and the fuse F3 have no fault, the contactor S6 is in a closing permission state, otherwise, the contactor S6 is prohibited from being closed;
s14: when the high-voltage connector Chn2 is in a connected state and the contactor S7 and the fuse F4 have no fault, the contactor S7 is in a closing-allowed state, otherwise, the contactor S7 is prohibited from being closed;
s15: when the high-voltage connector Chn3 is in a connected state and the contactor S8 and the fuse F5 have no fault, the contactor S8 is in a closing-allowed state, otherwise, the contactor S8 is prohibited from being closed;
s16: when the high-voltage connector Chn4 is in the connection state and the contactor S9 and the fuse F6 are not in fault, the contactor S9 is in the closing-allowed state, otherwise the contactor S9 is prohibited from being closed.
9. The vehicle-mounted compound power supply high-voltage power distribution unit control method according to claim 6, characterized in that: in the step S1, the insulation state of the circuit in which the sampling point is located is determined by detecting the insulation resistance value between each sampling point and the housing, and when the insulation resistance value of a certain sampling point is lower than a set threshold, the corresponding circuit insulation fault is reported, and the circuit contactor in which the sampling point is located is disconnected.
10. The vehicle-mounted compound power supply high-voltage power distribution unit control method according to claim 9, characterized in that: the insulation detection program comprises the following steps:
s21: when the insulation resistance values of the sampling point T1 and the sampling point T2 are normal, the contactor S1 and the contactor S2 are in a closing-allowed state, and otherwise, the contactor S2 is in a closing-forbidden state;
s22: when the insulation resistance values of the sampling point T14, the sampling point T3, the sampling point T4 and the sampling point T5 are normal, the contactors S3 and S4 are in a closing-allowed state, and otherwise, the contactors S3 and S4 are in a closing-forbidden state;
s23: when the insulation resistance values of the sampling point T6 and the sampling point T10 are normal, the contactor S6 is in a closing-allowed state, and otherwise, the contactor S6 is in a closing-forbidden state;
s24: when the insulation resistance values of the sampling point T7 and the sampling point T11 are normal, the contactor S7 is in a closing-allowed state, and otherwise, the contactor S7 is in a closing-forbidden state;
s25: when the insulation resistance values of the sampling point T8 and the sampling point T12 are normal, the contactor S8 is in a closing-allowed state, and otherwise, the contactor S8 is in a closing-forbidden state;
s26: when the insulation resistance values of the sampling points T9 and T13 are normal, the contactor S9 is in a closing-allowed state, otherwise, the contactor S9 is in a closing-forbidden state.
CN202210224532.8A 2022-03-09 2022-03-09 High-voltage power distribution unit for vehicle-mounted composite power supply and control method thereof Active CN114552524B (en)

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