CN112213631B - Relay state detection device and method and automobile - Google Patents
Relay state detection device and method and automobile Download PDFInfo
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- CN112213631B CN112213631B CN202010914954.9A CN202010914954A CN112213631B CN 112213631 B CN112213631 B CN 112213631B CN 202010914954 A CN202010914954 A CN 202010914954A CN 112213631 B CN112213631 B CN 112213631B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/327—Testing of circuit interrupters, switches or circuit-breakers
- G01R31/3277—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches
- G01R31/3278—Testing of circuit interrupters, switches or circuit-breakers of low voltage devices, e.g. domestic or industrial devices, such as motor protections, relays, rotation switches of relays, solenoids or reed switches
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/04—Voltage dividers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/10—Measuring sum, difference or ratio
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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- 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
- H02H3/20—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 responsive to excess voltage
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/222—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for switches
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- Electric Propulsion And Braking For Vehicles (AREA)
Abstract
The invention discloses a state detection device and method of a relay and an automobile, wherein the device comprises the following components: the power supply unit is used for converting the high-voltage battery to obtain a low-voltage power supply; the first isolation sampling module is used for carrying out isolation sampling on the output voltage of the high-voltage battery to obtain a reference voltage signal; the second isolation sampling module takes the low-voltage power supply as a power supply and carries out isolation sampling on a second voltage signal at the relay of one load control branch circuit to obtain a relay voltage signal; and the control unit is used for determining a voltage difference value between the relay voltage signal and the reference voltage signal, determining that the relay is adhered if the voltage difference value exceeds a set voltage threshold value, controlling the relay to be disconnected, and transmitting a fault message of the adhesion of the relay to a set control end. According to the scheme, the voltage of the high-voltage battery is converted into the low-voltage power supply to supply power to the isolation detection device, so that the cost of the power supply of the isolation detection device can be reduced.
Description
Technical Field
The invention belongs to the technical field of relay detection, particularly relates to a state detection device and method of a relay and an automobile, and particularly relates to a state detection device and method of a multi-path relay applied to an integrated controller of an electric automobile and an automobile.
Background
In the state detection of whether the relay is adhered or not, a power supply of the used isolation detection device is a low-voltage power supply. The low-voltage power supply is generally obtained by converting a low-voltage battery system through a transformer or an isolation power supply with high isolation voltage level, and the cost is high.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention aims to provide a state detection device and method of a relay and an automobile, which aim to solve the problem that the cost of a power supply of an isolation detection device is high in the state detection of whether the relay is adhered or not, and achieve the effect of reducing the cost of the power supply of the isolation detection device.
The invention provides a state detection device of a relay, comprising: the device comprises a power supply unit, an isolation sampling unit and a control unit; the isolated sampling unit comprises: the device comprises a first isolation sampling module and a second isolation sampling module; the power supply unit is configured to convert a high-voltage battery to obtain a low-voltage power supply; the first isolation sampling module is configured to perform isolation sampling on the output voltage of the high-voltage battery to obtain a reference voltage signal of the high-voltage battery; the second isolation sampling module is configured to use the low-voltage power supply as a power supply, and perform isolation sampling on output voltage at a relay of one load control branch circuit under the condition that the relay of the load control branch circuit is closed, so as to obtain a relay voltage signal at the relay of the load control branch circuit; the control unit is configured to determine a voltage difference value between the relay voltage signal and the reference voltage signal and determine whether the voltage difference value exceeds a set voltage threshold; and if the voltage difference exceeds the set voltage threshold, determining that the relay in the load control branch is adhered, controlling the relay in the load control branch to be disconnected, and transmitting a fault message of the adhesion of the relay in the load control branch to a set control end.
In some embodiments, the number of the second isolated sampling modules is more than one; and one of the more than one second isolation sampling modules corresponds to one load control branch.
In some embodiments, the power supply unit includes: the device comprises a voltage division and current limiting module, a power supply determination module and a voltage stabilization and filtering module; wherein, power supply unit converts high voltage battery, obtains low voltage power, includes: the voltage dividing and current limiting module is configured to divide and limit the high voltage output by the high-voltage battery to obtain a low voltage; the power supply determination module configured to provide the low voltage power supply based on the low voltage; the voltage stabilizing and filtering module is configured to perform voltage stabilizing and filtering processing on the low-voltage power supply.
In some embodiments, the voltage dividing and limiting module includes: a resistance module; the power supply determination module includes: a voltage stabilizing diode module; the voltage stabilizing and filtering module comprises: and a capacitance module.
In some embodiments, the first isolation sampling module and the second isolation sampling module have the same structure, a sampling end of the first isolation sampling module is connected to an output end of the high-voltage battery, and a sampling end of the second isolation sampling module is connected to an output end of the relay in the load control branch; the first isolated sampling module comprising: the device comprises a voltage sampling module, an isolation module and an amplification module; wherein, first isolation sampling module is right high voltage battery's output voltage keeps apart the sampling, obtains high voltage battery's reference voltage signal includes: the voltage sampling module is configured to perform voltage sampling on the output voltage of the high-voltage battery to obtain a first voltage signal; the isolation module is configured to output a differential voltage signal after the first voltage signal is subjected to isolation processing; the amplifying module is configured to convert the differential voltage signal into a unipolar voltage signal as the reference voltage signal.
In some embodiments, the first isolated sampling module further comprises: the device comprises a first filtering module and a second filtering module; wherein, first isolation sampling module is right high voltage battery's output voltage keeps apart the sampling, obtains high voltage battery's reference voltage signal still includes: the first filtering module is configured to filter the first voltage signal; the second filtering module is configured to perform filtering processing on the unipolar voltage signal.
In accordance with the above apparatus, a further aspect of the present invention provides an automobile comprising: the state detection device of the relay.
In accordance with the above vehicle, a further aspect of the present invention provides a method for detecting a state of a relay of a vehicle, including: converting the high-voltage battery to obtain a low-voltage power supply; carrying out isolated sampling on the output voltage of the high-voltage battery to obtain a reference voltage signal of the high-voltage battery; taking the low-voltage power supply as a power supply, and under the condition that a relay of one load control branch is closed, carrying out isolated sampling on the output voltage of the relay of the load control branch to obtain a relay voltage signal of the relay of the load control branch; determining a voltage difference between the relay voltage signal and the reference voltage signal and determining whether the voltage difference exceeds a set voltage threshold; and if the voltage difference exceeds the set voltage threshold, determining that the relay in the load control branch is adhered, controlling the relay in the load control branch to be disconnected, and transmitting a fault message of the adhesion of the relay in the load control branch to a set control end.
In some embodiments, the converting the high voltage battery to obtain the low voltage power source includes: carrying out voltage division and current limiting on the high voltage output by the high-voltage battery to obtain low voltage; providing the low voltage power supply based on the low voltage; and carrying out voltage stabilization and filtering treatment on the low-voltage power supply.
In some embodiments, the performing isolated sampling on the output voltage of the high voltage battery to obtain a reference voltage signal of the high voltage battery includes: carrying out voltage sampling on the output voltage of the high-voltage battery to obtain a first voltage signal; after the first voltage signal is isolated, a differential voltage signal is output; and converting the differential voltage signal into a unipolar voltage signal as the reference voltage signal.
In some embodiments, the performing isolated sampling on the output voltage of the high voltage battery to obtain a reference voltage signal of the high voltage battery further includes: filtering the first voltage signal; and filtering the unipolar voltage signal.
Therefore, according to the scheme of the invention, under the condition that the voltage of the high-voltage battery is converted into the power supply of the low-voltage power supply, the isolation detection device is adopted to conduct isolation sampling on the closed relay voltage, the sampled relay voltage is compared with the voltage of the high-voltage battery, the relay is determined to be adhered under the condition that the voltage deviation between the relay voltage and the voltage of the high-voltage battery exceeds a set range, the relay state is sent to the whole vehicle controller under the condition that the relay is adhered, and the whole vehicle controller conducts forced power-off on the relay which is adhered, so that the detection and control on the states of a plurality of relays can be realized, and the safety of the whole vehicle can be ensured; the voltage of the high-voltage battery is converted into a low-voltage power supply to supply power to the isolation detection device, so that the cost of the power supply of the isolation detection device can be reduced.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
The technical solution of the present invention is further described in detail by the accompanying drawings and embodiments.
Drawings
FIG. 1 is a schematic structural diagram of a state detection device of a relay according to an embodiment of the present invention;
FIG. 2 is a schematic flowchart of an embodiment of a method for detecting a stuck state of a plurality of relays in an integrated controller of an electric vehicle;
FIG. 3 is a schematic structural diagram of an embodiment of a low-voltage power supply used in a method for detecting the adhesion state of a plurality of relays in an integrated controller of an electric vehicle;
FIG. 4 is a schematic structural diagram of an embodiment of a system for detecting a stuck state of a plurality of relays in an integrated controller of an electric vehicle;
FIG. 5 is a flowchart illustrating a method for detecting a state of a relay according to an embodiment of the present invention;
FIG. 6 is a schematic flow chart illustrating one embodiment of converting a high voltage battery according to the method of the present invention;
fig. 7 is a schematic flowchart of an embodiment of isolated sampling of the output voltage of the high-voltage battery in the method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the specific embodiments of the present invention and the accompanying drawings. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
According to an embodiment of the present invention, there is provided a state detection device of a relay. Referring to fig. 1, a schematic diagram of an embodiment of the apparatus of the present invention is shown. The state detection device of this relay can use in the state detection of each way relay in electric automobile's integrated controller, and the state detection device of each way relay in electric automobile's integrated controller can include: the device comprises a power supply unit, an isolation sampling unit and a control unit. The isolated sampling unit can include: the device comprises a first isolation sampling module and a second isolation sampling module.
Specifically, the power supply unit can be configured to convert a high-voltage battery into a low-voltage power supply; i.e. the high voltage output by the high voltage battery is converted into a low voltage to be used as a low voltage power supply. The high-voltage battery can be a high-voltage battery for providing power supply for the electric equipment, such as a high-voltage battery of an electric automobile.
In some embodiments, the power supply unit can include: the device comprises a voltage division and current limiting module, a power supply determination module and a voltage stabilization and filtering module.
Wherein, the power supply unit converts high voltage battery, obtains low voltage power, can include:
the voltage dividing and current limiting module can be configured to divide and limit the high voltage output by the high-voltage battery to obtain a low voltage.
The power supply determination module can be configured to provide the low voltage power supply, i.e., provide the required low voltage power supply, based on the low voltage.
The voltage stabilizing and filtering module can be configured to stabilize and filter the low-voltage power supply.
From this, through partial pressure and current-limiting module, power determination module and steady voltage and filtering module, realize the power supply scheme of the isolation opto-coupler (promptly optoelectronic coupler) of high-pressure side, solved the power supply scheme's of the isolation opto-coupler (promptly optoelectronic coupler) of high-pressure side circuit complicacy, with high costs and bulky problem for keep apart opto-coupler (promptly optoelectronic coupler) power supply's circuit simple, with low costs, easily realize.
In some embodiments, the voltage dividing and limiting module may include: and a resistance module. The power determining module can include: and the voltage stabilizing diode module. The voltage stabilizing and filtering module can include: and a capacitance module.
For example: the high voltage is converted to a low voltage by resistor R1 and zener diode Z1. The positive electrode BAT + of the high-voltage battery is connected with the negative electrode (such as analog ground) of the high-voltage battery through a resistor R1 (connected with a voltage stabilizing diode Z1 in series, and the other end (namely the anode of a voltage stabilizing diode Z1) of the voltage stabilizing diode Z1 to obtain voltage V1, and power is supplied to each isolation optocoupler (namely an optocoupler).
The capacitor C1 is connected in parallel with the zener diode Z1 and is used for stabilizing the voltage V1. The resistor R1 may be a resistor or a resistor group formed by connecting several resistors in series, and is used for voltage division and current limiting. The zener diode Z1 is used to output a required low voltage power supply, and the capacitor C1 is used for filtering and stabilizing the low voltage power supply, and may be one or more capacitors with different capacitance values. The high-voltage battery converts low voltage through a resistor R1 and a voltage-stabilizing diode Z1 and is used as a power supply of an isolation optocoupler (namely a photoelectric coupler).
Specifically, the first isolation sampling module can be configured to perform isolation sampling on the output voltage of the high-voltage battery to obtain a reference voltage signal of the high-voltage battery.
Specifically, the second isolation sampling module can be configured to use the low-voltage power supply as a power supply, and perform isolation sampling on the output voltage at the relay in the load control branch under the condition that the relay in the load control branch is closed, so as to obtain a relay voltage signal at the relay in the load control branch. The load control branch corresponds to the second isolation sampling module one by one. And a relay is arranged in each load branch and can control the connection or disconnection between the load in the load branch and the high-voltage battery.
In some embodiments, the number of the second isolated sampling modules is more than one. And one of the more than one second isolation sampling modules corresponds to one load control branch.
Specifically, one of the more than one second isolation sampling modules may be configured to use the low-voltage power supply as a power supply, and perform isolation sampling on the output voltage at the relay in one load control branch when the relay in the load control branch is closed, so as to obtain a relay voltage signal at the relay in the load control branch. The load control branch corresponds to the second isolation sampling module one by one.
For example: for an integrated controller of an automobile, a plurality of relays need a plurality of adhesion detection circuits, so that the state detection and control of relays in a multi-path load control branch circuit in the integrated controller of the automobile can be realized at low cost and reliably, a detection system capable of ensuring the adhesion state of a plurality of relays can accurately and reliably detect the working state of the relays, and the safe operation of the whole automobile is ensured.
In particular, the control unit can be configured to determine a voltage difference between the relay voltage signal and the reference voltage signal and determine whether the voltage difference exceeds a set voltage threshold. The voltage difference between the relay voltage signal and the reference voltage signal may be an absolute value of a difference between the relay voltage signal and the reference voltage signal. And the number of the first and second groups,
specifically, the control unit can be further configured to determine that the relay in the load control branch is stuck if the voltage difference exceeds the set voltage threshold, control the relay in the load control branch to be turned off, and transmit a fault message indicating that the relay in the load control branch is stuck to the set control terminal. For example: in an integrated controller of an automobile, under the condition that a control unit such as a DSP (digital signal processor), an MUC (multi-processor controller) and the like determines that a relay in a load control branch is adhered, the relay in the load control branch is controlled to be disconnected, and the adhered fault of the relay in the load control branch is transmitted to a finished automobile controller of the automobile through CAN (controller area network) communication.
Of course, the control unit may also be configured to determine that the relay in the load control branch is not adhered if the voltage difference does not exceed the set voltage threshold, control the relay in the load control branch to be turned off, and transmit a fault message indicating that the relay in the load control branch is adhered to the set control terminal.
For example: firstly, the voltage of the high-voltage battery is sampled, for example, the high-voltage battery is divided by a plurality of resistors and converted into a low-voltage signal. Under the power supply of a low-voltage power supply, the low-voltage power supply enters the DSP through an isolation optocoupler (namely a photoelectric coupler) and then is amplified by an operational amplifier, and enters the DSP through an optocoupler isolation circuit and a filter circuit. Other loads, such as a main drive and an auxiliary drive, sample voltage after the relay is closed, and enter the DSP through an isolation optocoupler (namely a photocoupler) and an operational amplifier. The DSP judges whether the voltage value and the voltage deviation of the high-voltage battery are within a certain range, if the voltage value and the voltage deviation exceed a threshold value, the relay is judged to have an adhesion fault, and the integrated controller sends the fault to the vehicle controller, so that the safety of the vehicle is ensured. If the DSP judges that the voltage value and the voltage deviation of the high-voltage battery are within a certain range, the fact that the relay does not have adhesion fault is indicated, and follow-up operation can be continued.
Therefore, under the condition that the low-voltage power supply obtained by converting the high-voltage battery supplies power, the closed relay voltage is sampled and compared with the high-voltage battery voltage, whether the relay is adhered or not is judged, the relay state is sent to the vehicle control unit, the states of the relays are reliably and accurately detected, and the safety of the vehicle is ensured. The low-voltage power supply obtained by converting the high-voltage battery supplies power, and is low in cost, simple and easy to implement.
In some embodiments, the first and second isolated sampling modules are identical in structure, and serve primarily to isolate voltage sampling. The sampling end of the first isolation sampling module is connected to the output end of the high-voltage battery, and the sampling end of the second isolation sampling module is connected to the output end of the relay in the load control branch. For example: the sampling end of the second isolation sampling module is connected between the fixed end of the normally open contact of the relay of the load control branch and the load, and the contact end of the normally open contact of the relay of the load control branch is connected to the output end of the high-voltage battery.
The first isolated sampling module can include: the device comprises a voltage sampling module, an isolation module and an amplification module. The first isolation sampling module is used for performing isolation sampling on the output voltage of the high-voltage battery to obtain a reference voltage signal of the high-voltage battery, and can include:
the voltage sampling module can be configured to perform voltage sampling on the output voltage of the high-voltage battery to obtain a first voltage signal.
The isolation module can be configured to output a differential voltage signal after the first voltage signal is isolated.
The amplifying module can be configured to convert the differential voltage signal into a unipolar voltage signal as the reference voltage signal.
For example: in the voltage sampling module, the resistor R2, the resistor R3, the resistor R4, and the resistor R5 are voltage dividing resistors, and may be several resistors or more resistors for voltage division. Through the partial pressure, can divide a less voltage with high voltage, input the input of first isolation opto-coupler (promptly optoelectronic coupler), electric capacity mainly used filtering. The main effect of first isolation opto-coupler (promptly optoelectronic coupler) is the isolation that realizes the signal, conveys the analog voltage signal of high-pressure side to the control side, can keep apart the interference simultaneously, avoids disturbing the entering control side.
For example: the isolation module may include a photo coupler. The amplification module may be capable of including: the first operational amplifier a1, the resistor R14, the resistor R15, the resistor R20, the resistor R21, the capacitor C5, and the capacitor C6 form a differential amplifier circuit, and convert a differential signal output by the optical coupler into a signal of a single polarity. The capacitor C5 and the capacitor C6 can be selected according to actual needs.
In some embodiments, the first isolated sampling module can further include: the device comprises a first filtering module and a second filtering module.
The first isolation sampling module is used for performing isolation sampling on the output voltage of the high-voltage battery to obtain a reference voltage signal of the high-voltage battery, and can further include:
the first filtering module can be configured to perform filtering processing on the first voltage signal, so as to output the first voltage signal to the isolating module after performing filtering processing on the first voltage signal.
The second filtering module can be configured to filter the unipolar voltage signal, so that the unipolar voltage signal is used as the reference voltage signal after being filtered.
For example: the positive electrode BAT + of the high-voltage battery passes through a voltage sampling circuit formed by a resistor R2, a resistor R3, a resistor R4 and a resistor R5, the resistor R5 is connected with a capacitor C2 in parallel, and a voltage signal on the resistor R3838 is input into a first isolation optocoupler (namely a photocoupler). The resistor R28 and the capacitor C11 form a low-pass filter circuit which is close to an input pin of the DSP (or MCU) and is used for filtering high-frequency interference signals.
The differential signal output by the first isolation optocoupler (i.e. the photocoupler) is converted into a unipolar signal through an amplifying circuit consisting of a resistor R14, a resistor R15, a resistor R20, a resistor R21, a capacitor C5, a capacitor C6 and a first operational amplifier A1, and then is filtered through a resistor R28 and a capacitor C11 and enters the DSP.
Therefore, the voltage of the high-voltage battery and the voltage value of the closed relay of the main drive load or other loads are calculated through the control units such as the DSP and the MCU, the voltage deviation of the high-voltage battery and the voltage value of the high-voltage battery is compared, whether the voltage deviation exceeds a set limit value or not is judged, and if the voltage deviation does not exceed the set limit value, the relay is not adhered; if the current exceeds the limit value, the relay is determined to be adhered, the DSP controls the relay to be disconnected, the adhesion fault is transmitted to the vehicle control unit through CAN communication, and the vehicle control unit executes the next power-on and power-off operation to ensure the safe and reliable operation of the vehicle.
Through a large number of tests, the technical scheme of the invention is adopted, under the condition that the high-voltage battery voltage is converted into the low-voltage power supply, the isolation detection device is adopted to conduct isolation sampling on the closed relay voltage, the sampled relay voltage is compared with the high-voltage battery voltage, the relay is determined to be adhered under the condition that the voltage deviation between the relay voltage and the high-voltage battery voltage exceeds the set range, the relay state is sent to the whole vehicle controller under the condition that the relay is adhered, and the whole vehicle controller conducts forced power-off on the relay which is adhered, so that the detection and control of the states of a plurality of relays can be realized, the safety of the whole vehicle can be ensured, and the cost of the low-voltage power supply is low.
According to an embodiment of the present invention, there is also provided an automobile corresponding to the state detection device of the relay. The automobile may be able to include: the state detection device of the relay.
The integrated controller of the electric automobile is mainly integrated with a main drive controller, an auxiliary drive controller (an oil pump controller, an air pump controller and DC/DC), an air conditioner, electric heating, electric defrosting and the like. By controlling the relay, the connection of each part in the integrated controller of the electric automobile and the high-voltage battery system can be realized.
The relay is a key component of a high-voltage power supply system of the electric automobile, and adhesion phenomena can be generated in the switching-on and switching-off processes, so that the load is not really disconnected or connected with a high-voltage part, and the safety of the whole automobile is seriously affected. And the voltage after the relay is closed is isolated and detected, so that the adhesion fault can be accurately judged, and the state of the relay can be accurately and reliably detected. A plurality of relays are arranged in an integrated controller of the electric automobile, and safety and reliability can be ensured by respectively detecting the working states of the relays.
The power supply for the device for isolated detection (generally an optocoupler) is a low voltage supply of a few volts. How to obtain this low voltage power supply in a high voltage battery system is an important part of the relay state detection. In some schemes, the low-voltage power supply is generally realized by a low-voltage battery system (such as a 24V or 12V low-voltage battery system) through transformer conversion, and the circuit structure is complex and high in cost; or the isolation power supply conversion module with high isolation voltage grade is adopted, so that the cost is high. Both of these methods have large circuit size, high cost and complicated circuit.
In some embodiments, the present invention provides a scheme for detecting the adhesion state of a plurality of relays in an integrated controller of an electric vehicle, and in particular, to a system and a method for detecting the state of a multi-path relay in an integrated controller of an electric vehicle, which are suitable for other occasions requiring relay fault detection or relay state detection.
Fig. 2 is a flowchart illustrating an embodiment of a method for detecting a stuck state of a plurality of relays in an integrated controller of an electric vehicle. As shown in fig. 2, the process for detecting the adhesion state of a plurality of relays in an integrated controller of an electric vehicle includes:
step 1, firstly, sampling the voltage of the high-voltage battery, for example, the high-voltage battery is divided by a plurality of resistors and converted into a low-voltage signal. Under the power supply of a low-voltage power supply, the low-voltage power supply enters the DSP through an isolation optocoupler (namely a photoelectric coupler) and then is amplified by an operational amplifier, and enters the DSP through an optocoupler isolation circuit and a filter circuit.
Other loads, such as a main drive and an auxiliary drive, sample voltage after the relay is closed, and enter the DSP through an isolation optocoupler (namely a photocoupler) and an operational amplifier.
And 2, judging whether the voltage value and the voltage deviation of the high-voltage battery are within a certain range by the DSP, if the voltage value and the voltage deviation exceed a threshold value, indicating that the relay has an adhesion fault, and sending the fault to the vehicle controller by the integrated controller to ensure the safety of the vehicle. If the DSP judges that the voltage value and the voltage deviation of the high-voltage battery are within a certain range, the fact that the relay does not have adhesion fault is indicated, and follow-up operation can be continued.
Fig. 3 is a schematic structural diagram of an embodiment of a low-voltage power supply used in a method for detecting the adhesion state of a plurality of relays in an integrated controller of an electric vehicle. As shown in fig. 3, the low voltage power supply includes: resistor R1, zener diode Z1 and capacitor C1. The first end of the resistor R1 is connected to the anode BAT of the high-voltage battery, the second end of the resistor R1 is connected to the cathode of the Zener diode Z1, and the anode of the Zener diode Z2 is connected to the analog ground. The capacitor C1 is connected in parallel with the zener diode Z1. The second end of the resistor R1 can output a voltage V1. The high voltage is converted to a low voltage by resistor R1 and zener diode Z1.
In the example shown in fig. 3, the positive electrode BAT + of the high-voltage battery is connected in series with the zener diode Z1 through the resistor R1, and the other end of the zener diode Z1 (i.e., the anode of the zener diode Z1) is connected with the negative electrode (e.g., analog ground) of the high-voltage battery to obtain a voltage V1 for supplying power to each isolation optocoupler (i.e., photocoupler).
The capacitor C1 is connected in parallel with the zener diode Z1 and is used for stabilizing the voltage V1. The resistor R1 may be a resistor or a resistor group formed by connecting several resistors in series, and is used for voltage division and current limiting. The zener diode Z1 is used to output a required low voltage power supply, and the capacitor C1 is used for filtering and stabilizing the low voltage power supply, and may be one or more capacitors with different capacitance values.
In the scheme of the invention, the power supply scheme of the isolation optocoupler (namely, the photocoupler) at the high-voltage side can be realized by the resistor R1, the voltage-stabilizing diode Z1 and the like, so that the problems of complex circuit, high cost and large volume of the power supply scheme of the isolation optocoupler (namely, the photocoupler) at the high-voltage side are solved, the circuit of the power supply of the isolation optocoupler (namely, the photocoupler) is simple, low in cost and easy to realize, the detection system capable of ensuring the adhesion state of a plurality of relays can accurately and reliably detect the working state of the relays, and the safe operation of the whole vehicle is ensured.
Fig. 4 is a schematic structural diagram of an embodiment of a system for detecting a stuck state of a plurality of relays in an integrated controller of an electric vehicle. A detection system for the adhesion state of a plurality of relays in an integrated controller of an electric automobile mainly plays a role in isolating voltage sampling. As shown in fig. 4, the system for detecting the adhesion state of a plurality of relays in an integrated controller of an electric vehicle includes: the device comprises a first detection circuit, a second detection circuit, a third detection circuit and a DSP. The first detection circuit, the second detection circuit and the third detection circuit are all connected to the DSP.
A first detection circuit comprising: the circuit comprises a resistor R2, a resistor R3, a resistor R4, a resistor R5, a resistor R14, a resistor R15, a resistor R20, a resistor R21, a capacitor C2, a capacitor C5, a capacitor C6, a capacitor C11 and a first isolation optocoupler (namely a photocoupler). The positive electrode BAT + of the high-voltage battery passes through the resistor R2, the resistor R3 and the resistor R4 and then is input to a first terminal (namely a first input end) of a first isolation optocoupler (namely a photoelectric coupler), the resistor R5 is connected with the capacitor C2 in parallel, and the first end of the resistor R5 is connected to the first terminal (namely the first input end). A second terminal of resistor R5 is connected to a second terminal of the first isolating optocoupler (i.e., optocoupler). The third terminal of the first isolation optocoupler (namely, the photocoupler) is connected with a power supply V1, the fourth terminal of the first isolation optocoupler (namely, the photocoupler) is connected with a power supply V2, the fifth terminal of the first isolation optocoupler (namely, the photocoupler) is connected with a wire grounding end, the sixth terminal of the first isolation optocoupler (namely, the photocoupler) is connected to the non-inverting input end of the first operational amplifier A1 through a resistor R14, and the seventh terminal of the first isolation optocoupler (namely, the photocoupler) is connected to the inverting input end of the first operational amplifier A1 through a resistor R15. The resistor R20 and the capacitor C5 are connected in parallel and then connected between the non-inverting input terminal of the first operational amplifier A1 and the output terminal of the first operational amplifier A1. The resistor 21 and the capacitor C6 are connected in parallel and then connected in parallel between the inverting input terminal of the first operational amplifier and the output terminal of the first operational amplifier. The output terminal of the first operational amplifier a1 is connected to the first input terminal of the DSP through the resistor R28, and is also connected to the capacitor C11 and is connected to the wire ground.
Wherein, the control side in the DSP system needs power supplies of various voltages, and the power supply V2 is one of them, usually 3.3V or 5V, and the voltage reference ground is the same as the power supply reference ground of the DSP (or MCU). The power supply V2 is typically converted from a low voltage power supply on board the vehicle one or more times via a voltage reduction circuit.
A second detection circuit comprising: the circuit comprises a switch K1, a main negative drive load, a resistor R6, a resistor R7, a resistor R8, a resistor R9, a resistor R16, a resistor R17, a resistor R20, a resistor R21, a capacitor C3, a capacitor C7, a capacitor C8, a capacitor C12 and a second isolation optocoupler (namely an optocoupler). After passing through a switch K1, the positive electrode BAT + of the high-voltage battery passes through a resistor R6, a resistor R7 and a resistor R8 and then is input to a first terminal (namely a first input end) of a second isolation optocoupler (namely a photoelectric coupler), and the positive electrode BAT + of the high-voltage battery also passes through a main drive load and then is connected to a simulation ground (namely the negative electrode BAT-). The resistor R9 is connected in parallel with the capacitor C3, and a first terminal of the resistor R9 is connected to a first terminal (i.e., a first input terminal). A second terminal of resistor R9 is connected to a second terminal of a second isolating optocoupler (i.e., an optocoupler). The third terminal of the second isolation optocoupler (namely, the photocoupler) is connected with a power supply V1, the fourth terminal of the second isolation optocoupler (namely, the photocoupler) is connected with a power supply V2, the fifth terminal of the second isolation optocoupler (namely, the photocoupler) is connected with a wire grounding end, the sixth terminal of the second isolation optocoupler (namely, the photocoupler) is connected to the non-inverting input end of the second operational amplifier A2 through a resistor R16, and the seventh terminal of the second isolation optocoupler (namely, the photocoupler) is connected to the inverting input end of the second operational amplifier A2 through a resistor R17. The resistor R22 and the capacitor C7 are connected in parallel and then connected between the non-inverting input terminal of the second operational amplifier A2 and the output terminal of the second operational amplifier. The resistor R23 and the capacitor C8 are connected in parallel and then connected between the inverting input terminal of the second operational amplifier A2 and the output terminal of the second operational amplifier A2. The output terminal of the second operational amplifier a2 is connected to the second input terminal of the DSP through the resistor R26, and further connected to the capacitor C12 and then connected to the wire ground.
A third detection circuit comprising: the circuit comprises a switch K2, a main negative drive load, a resistor R10, a resistor R11, a resistor R12, a resistor R13, a resistor R18, a resistor R19, a resistor R24, a resistor R21, a capacitor C4, a capacitor C10, a capacitor C9, a capacitor C13 and a third isolation optocoupler (namely, an optocoupler). After passing through a switch K2, the positive electrode BAT + of the high-voltage battery passes through a resistor R10, a resistor R11 and a resistor R12 and then is input to a first terminal (namely a first input end) of a third isolation optocoupler (namely a photoelectric coupler), and the positive electrode BAT + of the high-voltage battery also passes through an auxiliary drive load and then is connected to a simulation ground (namely the negative electrode BAT-). The resistor R13 is connected in parallel with the capacitor C4, and a first terminal of the resistor R13 is connected to a first terminal (i.e., a first input terminal). A second terminal of resistor R13 is connected to a second terminal of a third isolating optocoupler (i.e., an optocoupler). The third terminal of the third isolating optocoupler (i.e. the photocoupler) is connected with a power supply V1, the fourth terminal of the third isolating optocoupler (i.e. the photocoupler) is connected with a power supply V2, the fifth terminal of the third isolating optocoupler (i.e. the photocoupler) is connected with a wire grounding end, the sixth terminal of the third isolating optocoupler (i.e. the photocoupler) is connected to the non-inverting input end of the third operational amplifier A3 through a resistor R18, and the seventh terminal of the third isolating optocoupler (i.e. the photocoupler) is connected to the inverting input end of the third operational amplifier A3 through a resistor R19. The resistor R24 and the capacitor C10 are connected in parallel and then connected between the non-inverting input terminal of the third operational amplifier A3 and the output terminal of the second operational amplifier. The resistor R25 and the capacitor C9 are connected in parallel and then connected between the inverting input terminal of the third operational amplifier A3 and the output terminal of the third operational amplifier A3. The output terminal of the third operational amplifier a3 is connected to the third input terminal of the DSP through the resistor R27, and is also connected to the capacitor C13 and is connected to the wire ground.
In the example shown in fig. 2 and 4, the positive electrode BAT + of the high-voltage battery passes through a voltage sampling circuit formed by a resistor R2, a resistor R3, a resistor R4 and a resistor R5, the resistor R5 is connected in parallel with a capacitor C2, and a voltage signal on the resistor R3838 is input into a first isolation optocoupler (i.e., a photocoupler). The differential signal output by the first isolation optocoupler (i.e. the photocoupler) is converted into a unipolar signal through an amplifying circuit formed by a resistor R14, a resistor R15, a resistor R20, a resistor R21, a capacitor C5, a capacitor C6 and a first operational amplifier A1, and then is filtered by a resistor R28 and a capacitor C11 and enters the DSP.
K1 and K2 are relay switches which are switched on and off by a controller of the whole vehicle. After the relay K1 is closed, the main driving part (namely a main driving load) is electrified, the high voltage of the main driving part passes through a voltage sampling circuit formed by a resistor R6, a resistor R7, a resistor R8 and a resistor R9, the resistor R9 is connected with a capacitor C3 in parallel, and a voltage signal on the capacitor C3 is input into a second isolation optocoupler (namely a photocoupler). The differential signal output by the second isolation optocoupler (i.e. the photocoupler) passes through an amplifying circuit formed by a resistor R16, a resistor R17, a resistor R22, a resistor R23, a capacitor C7, a capacitor C8 and a second operational amplifier A2, the differential signal is converted into a unipolar signal, and the unipolar signal is filtered by a resistor R26 and a capacitor C12 and then enters the DSP.
The relay detection method of other loads is the same as that of the main drive part.
The DSP calculates the voltage of the high-voltage battery and the voltage value of the closed relay of the main drive load or other loads, compares the voltage value with the voltage deviation of the high-voltage battery, judges whether the voltage deviation exceeds a set limit value, and if the voltage deviation does not exceed the set limit value, the relay is not adhered; if the current exceeds the limit value, the relay is determined to be adhered, the DSP controls the relay to be disconnected, the adhesion fault is transmitted to the vehicle control unit through CAN communication, and the vehicle control unit executes the next power-on and power-off operation to ensure the safe and reliable operation of the vehicle.
In the example shown in fig. 4, taking the first detection circuit as an example, the resistor R2, the resistor R3, the resistor R4, and the resistor R5 are voltage dividing resistors, and may be the several resistors or more, for voltage division. Through the partial pressure, can divide a less voltage with high voltage, input the input of first isolation opto-coupler (promptly optoelectronic coupler), electric capacity mainly used filtering. The main effect of first isolation opto-coupler (promptly optoelectronic coupler) is the isolation that realizes the signal, conveys the analog voltage signal of high-pressure side to the control side, can keep apart the interference simultaneously, avoids disturbing the entering control side.
In the first detection circuit, a differential amplification circuit is formed by a first operational amplifier a1, a resistor R14, a resistor R15, a resistor R20, a resistor R21, a capacitor C5, and a capacitor C6, and converts a differential signal output by the optical coupler into a signal of a single polarity. The capacitor C5 and the capacitor C6 can be selected according to actual needs.
The resistor R28 and the capacitor C11 form a low-pass filter circuit which is close to an input pin of the DSP (or MCU) and is used for filtering high-frequency interference signals.
In the example shown in fig. 4, the sticking detection circuits of two relays are shown only by way of example, and in practice, several such sticking detection circuits are required for several relays.
Therefore, according to the scheme of the invention, the relay voltage after being closed is sampled and transmitted to the DSP through the isolation optocoupler (namely the photoelectric coupler), the amplifying circuit and the like, the DSP calculates and compares the voltage with the voltage of the high-voltage battery, judges whether the relay is adhered or not, and sends the relay state to the vehicle control unit, so that the states of a plurality of relays can be reliably and accurately detected, and the safety of the vehicle is ensured. The high-voltage battery converts low voltage through a resistor R1 and a voltage-stabilizing diode Z1 and is used as a power supply of an isolation optocoupler (namely a photoelectric coupler).
Since the processing and functions of the automobile of this embodiment are basically corresponding to the embodiment, principle and example of the device shown in fig. 1, the description of this embodiment is not given in detail, and reference may be made to the related description in the foregoing embodiment, which is not described herein again.
Through a large number of tests, the technical scheme of the invention is adopted, the voltage of the closed relay is sampled and transmitted to the DSP through the isolation optocoupler (namely a photoelectric coupler), the amplifying circuit and the like, the DSP calculates and compares the voltage with the voltage of the high-voltage battery, judges whether the relay is adhered or not, and sends the state of the relay to the vehicle controller, so that the states of a plurality of relays can be reliably and accurately detected, and the safety of the vehicle can be ensured.
According to an embodiment of the present invention, a method for detecting a state of a relay of an automobile corresponding to the automobile is also provided, as shown in fig. 5, which is a schematic flow chart of an embodiment of the method of the present invention. The state detection method of the automobile relay can be applied to state detection of each path of relay in an integrated controller of an electric automobile, and can comprise the following steps: step S110 to step S150.
At step S110, converting the high voltage battery through the power supply unit to obtain a low voltage power supply; i.e. the high voltage output by the high voltage battery is converted into a low voltage to be used as a low voltage power supply. The high-voltage battery can be a high-voltage battery for providing power supply for the electric equipment, such as a high-voltage battery of an electric automobile.
In some embodiments, the specific process of the power supply unit converting the high voltage battery to obtain the low voltage power in step S110 can be seen in the following exemplary descriptions.
The following further describes a specific process of converting the high-voltage battery in step S110 with reference to a schematic flow chart of an embodiment of converting the high-voltage battery in the method of the present invention shown in fig. 6, and the specific process can include: step S210 to step S230.
And step S210, carrying out voltage division and current limiting processing on the high voltage output by the high-voltage battery through a voltage division and current limiting module to obtain low voltage.
Step S220, the power supply determination module provides the low-voltage power supply, i.e., provides the required low-voltage power supply, based on the low voltage.
And step S230, performing voltage stabilization and filtering processing on the low-voltage power supply through a voltage stabilization and filtering module.
From this, through partial pressure and current-limiting module, power determination module and steady voltage and filtering module, realize the power supply scheme of the isolation opto-coupler (promptly optoelectronic coupler) of high-pressure side, solved the power supply scheme's of the isolation opto-coupler (promptly optoelectronic coupler) of high-pressure side circuit complicacy, with high costs and bulky problem for keep apart opto-coupler (promptly optoelectronic coupler) power supply's circuit simple, with low costs, easily realize.
In step S120, the output voltage of the high voltage battery is isolated and sampled by a first isolation sampling module, so as to obtain a reference voltage signal of the high voltage battery.
In step S130, the low-voltage power supply is used as a power supply through the second isolation sampling module, and under the condition that the relay of one load control branch is closed, the output voltage of the relay of the load control branch is isolated and sampled, so as to obtain a relay voltage signal of the relay of the load control branch. The load control branch corresponds to the second isolation sampling module one by one. And a relay is arranged in each load branch and can control the connection or disconnection between the load in the load branch and the high-voltage battery.
At step S140, a voltage difference between the relay voltage signal and the reference voltage signal is determined by the control unit, and it is determined whether the voltage difference exceeds a set voltage threshold. And the number of the first and second groups,
in step S150, by the control unit, if the voltage difference exceeds the set voltage threshold, it is determined that the relay in the load control branch is adhered, the relay in the load control branch is controlled to be turned off, and a fault message indicating that the relay in the load control branch is adhered is transmitted to the set control terminal. For example: in an integrated controller of an automobile, under the condition that a control unit such as a DSP (digital signal processor), an MUC (multi-processor controller) and the like determines that a relay in a load control branch is adhered, the relay in the load control branch is controlled to be disconnected, and the adhered fault of the relay in the load control branch is transmitted to a finished automobile controller of the automobile through CAN (controller area network) communication.
Of course, if the voltage difference does not exceed the set voltage threshold, the control unit determines that the relay in the load control branch is not adhered, controls the relay in the load control branch to be switched off, and transmits a fault message of the adhesion of the relay in the load control branch to the set control terminal.
For example: firstly, the voltage of the high-voltage battery is sampled, for example, the high-voltage battery is divided by a plurality of resistors and converted into a low-voltage signal. Under the power supply of a low-voltage power supply, the low-voltage power supply enters the DSP through an isolation optocoupler (namely a photoelectric coupler) and then is amplified by an operational amplifier, and enters the DSP through an optocoupler isolation circuit and a filter circuit. Other loads, such as a main drive and an auxiliary drive, sample voltage after the relay is closed, and enter the DSP through an isolation optocoupler (namely a photocoupler) and an operational amplifier. The DSP judges whether the voltage value and the voltage deviation of the high-voltage battery are within a certain range, if the voltage value and the voltage deviation exceed a threshold value, the relay is judged to have an adhesion fault, and the integrated controller sends the fault to the vehicle controller, so that the safety of the vehicle is ensured. If the DSP judges that the voltage value and the voltage deviation of the high-voltage battery are within a certain range, the fact that the relay does not have adhesion fault is indicated, and follow-up operation can be continued.
Therefore, under the condition that the low-voltage power supply obtained by converting the high-voltage battery supplies power, the closed relay voltage is sampled and compared with the high-voltage battery voltage, whether the relay is adhered or not is judged, and the relay state is sent to the vehicle control unit, so that the states of the plurality of relays are reliably and accurately detected, and the safety of the vehicle is ensured; the low-voltage power supply obtained by converting the high-voltage battery supplies power, and is low in cost, simple and easy to implement.
In some embodiments, the specific process of the first isolation sampling module performing isolation sampling on the output voltage of the high-voltage battery in step S120 to obtain the reference voltage signal of the high-voltage battery can be referred to the following exemplary description.
The following further describes a specific process of performing isolated sampling on the output voltage of the high-voltage battery in step S120 with reference to a schematic flow chart of an embodiment of performing isolated sampling on the output voltage of the high-voltage battery in the method of the present invention shown in fig. 7, where the specific process may include: step S310 to step S330.
Step S310, voltage sampling is carried out on the output voltage of the high-voltage battery through a voltage sampling module, and a first voltage signal is obtained.
Step S320, isolating the first voltage signal by an isolation module, and outputting a differential voltage signal.
Step S330, converting the differential voltage signal into a unipolar voltage signal as the reference voltage signal through an amplifying module.
For example: in the voltage sampling module, the resistor R2, the resistor R3, the resistor R4, and the resistor R5 are voltage dividing resistors, and may be several resistors or more resistors for voltage division. Through the partial pressure, can divide a less voltage with high voltage, input the input of first isolation opto-coupler (promptly optoelectronic coupler), electric capacity mainly used filtering. The main effect of first isolation opto-coupler (promptly optoelectronic coupler) is the isolation that realizes the signal, conveys the analog voltage signal of high-pressure side to the control side, can keep apart the interference simultaneously, avoids disturbing the entering control side.
For example: the isolation module may include a photo coupler. The amplification module may be capable of including: the first operational amplifier a1, the resistor R14, the resistor R15, the resistor R20, the resistor R21, the capacitor C5, and the capacitor C6 form a differential amplifier circuit, and convert a differential signal output by the optical coupler into a signal of a single polarity. The capacitor C5 and the capacitor C6 can be selected according to actual needs.
In some embodiments, the first isolation sampling module in step S120 performs isolation sampling on the output voltage of the high-voltage battery to obtain a reference voltage signal of the high-voltage battery, and may further include at least one of the following processing procedures.
The first treatment process comprises the following steps: and filtering the first voltage signal through a first filtering module, so that the first voltage signal is output to the isolating module after being filtered.
And a second treatment process: and filtering the unipolar voltage signal through a second filtering module, so that the unipolar voltage signal is taken as the reference voltage signal after being filtered.
For example: the positive electrode BAT + of the high-voltage battery passes through a voltage sampling circuit formed by a resistor R2, a resistor R3, a resistor R4 and a resistor R5, the resistor R5 is connected with a capacitor C2 in parallel, and a voltage signal on the resistor R3838 is input into a first isolation optocoupler (namely a photocoupler). The resistor R28 and the capacitor C11 form a low-pass filter circuit which is close to an input pin of the DSP (or MCU) and is used for filtering high-frequency interference signals.
The differential signal output by the first isolation optocoupler (i.e. the photocoupler) is converted into a unipolar signal through an amplifying circuit consisting of a resistor R14, a resistor R15, a resistor R20, a resistor R21, a capacitor C5, a capacitor C6 and a first operational amplifier A1, and then is filtered through a resistor R28 and a capacitor C11 and enters the DSP.
Therefore, the voltage of the high-voltage battery and the voltage value of the closed relay of the main drive load or other loads are calculated through the control units such as the DSP and the MCU, the voltage deviation of the high-voltage battery and the voltage value of the high-voltage battery is compared, whether the voltage deviation exceeds a set limit value or not is judged, and if the voltage deviation does not exceed the set limit value, the relay is not adhered; if the current exceeds the limit value, the relay is determined to be adhered, the DSP controls the relay to be disconnected, the adhesion fault is transmitted to the vehicle control unit through CAN communication, and the vehicle control unit executes the next power-on and power-off operation to ensure the safe and reliable operation of the vehicle.
Since the processing and functions implemented by the method of this embodiment substantially correspond to the embodiments, principles and examples of the automobile, reference may be made to the related descriptions in the foregoing embodiments without being detailed in the description of this embodiment, which is not described herein.
Through a large amount of tests verification, adopt the technical scheme of this embodiment, through in the state detection whether the relay adhesion, convert into the low voltage power supply by high voltage battery voltage and supply power for keeping apart the detection device, can reduce the cost of keeping apart the power supply of detection device.
In summary, it is readily understood by those skilled in the art that the advantageous modes described above can be freely combined and superimposed without conflict.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (10)
1. A state detecting device of a relay, characterized by comprising: the device comprises a power supply unit, an isolation sampling unit and a control unit; the isolated sampling unit comprises: the device comprises a first isolation sampling module and a second isolation sampling module; wherein the content of the first and second substances,
the power supply unit is configured to convert a high-voltage battery to obtain a low-voltage power supply;
the first isolation sampling module is configured to perform isolation sampling on the output voltage of the high-voltage battery to obtain a reference voltage signal of the high-voltage battery;
the second isolation sampling module is configured to use the low-voltage power supply as a power supply, and perform isolation sampling on output voltage at a relay of one load control branch circuit under the condition that the relay of the load control branch circuit is closed, so as to obtain a relay voltage signal at the relay of the load control branch circuit;
the control unit is configured to determine a voltage difference value between the relay voltage signal and the reference voltage signal and determine whether the voltage difference value exceeds a set voltage threshold; and the number of the first and second groups,
if the voltage difference exceeds the set voltage threshold, determining that the relay in the load control branch is adhered, controlling the relay in the load control branch to be disconnected, and transmitting a fault message of the adhesion of the relay in the load control branch to a set control end;
the first isolation sampling module and the second isolation sampling module have the same structure, the sampling end of the first isolation sampling module is connected to the output end of the high-voltage battery, and the sampling end of the second isolation sampling module is connected to the output end of the relay in the load control branch;
the first isolated sampling module comprising: the device comprises a voltage sampling module, an isolation module and an amplification module; wherein the content of the first and second substances,
the first isolation sampling module is used for carrying out isolation sampling on the output voltage of the high-voltage battery to obtain a reference voltage signal of the high-voltage battery, and comprises:
the voltage sampling module is configured to perform voltage sampling on the output voltage of the high-voltage battery to obtain a first voltage signal;
the isolation module is configured to output a differential voltage signal after the first voltage signal is subjected to isolation processing;
the amplifying module is configured to convert the differential voltage signal into a unipolar voltage signal as the reference voltage signal.
2. The relay state detection device according to claim 1, wherein the number of the second isolation sampling modules is one or more; and one of the more than one second isolation sampling modules corresponds to one load control branch.
3. The state detection device of a relay according to claim 1 or 2, wherein the power supply unit includes: the device comprises a voltage division and current limiting module, a power supply determination module and a voltage stabilization and filtering module; wherein the content of the first and second substances,
the power supply unit converts the high-voltage battery to obtain a low-voltage power supply, and comprises:
the voltage dividing and current limiting module is configured to divide and limit the high voltage output by the high-voltage battery to obtain a low voltage;
the power supply determination module configured to provide the low voltage power supply based on the low voltage;
the voltage stabilizing and filtering module is configured to perform voltage stabilizing and filtering processing on the low-voltage power supply.
4. The apparatus of claim 3, wherein the voltage divider and current limiter module comprises: a resistance module; the power supply determination module includes: a voltage stabilizing diode module; the voltage stabilizing and filtering module comprises: and a capacitance module.
5. The relay state detection device of claim 1, wherein the first isolated sampling module further comprises: the device comprises a first filtering module and a second filtering module; wherein the content of the first and second substances,
the first isolation sampling module is used for isolating and sampling the output voltage of the high-voltage battery to obtain a reference voltage signal of the high-voltage battery, and further comprises:
the first filtering module is configured to filter the first voltage signal;
the second filtering module is configured to perform filtering processing on the unipolar voltage signal.
6. An automobile, comprising: a state detection device of a relay according to any one of claims 1 to 5.
7. A state detection method of a relay of an automobile according to claim 6, comprising:
converting the high-voltage battery to obtain a low-voltage power supply;
carrying out isolated sampling on the output voltage of the high-voltage battery to obtain a reference voltage signal of the high-voltage battery;
taking the low-voltage power supply as a power supply, and under the condition that a relay of one load control branch is closed, carrying out isolated sampling on the output voltage of the relay of the load control branch to obtain a relay voltage signal of the relay of the load control branch;
determining a voltage difference between the relay voltage signal and the reference voltage signal and determining whether the voltage difference exceeds a set voltage threshold; and the number of the first and second groups,
and if the voltage difference exceeds the set voltage threshold, determining that the relay in the load control branch is adhered, controlling the relay in the load control branch to be disconnected, and transmitting a fault message of the adhesion of the relay in the load control branch to a set control end.
8. The method for detecting the state of the relay of the automobile according to claim 7, wherein the converting the high voltage battery to obtain the low voltage power supply comprises:
carrying out voltage division and current limiting on the high voltage output by the high-voltage battery to obtain low voltage;
providing the low voltage power supply based on the low voltage;
and carrying out voltage stabilization and filtering treatment on the low-voltage power supply.
9. The method for detecting the state of the relay of the automobile according to claim 7 or 8, wherein the isolating and sampling the output voltage of the high-voltage battery to obtain the reference voltage signal of the high-voltage battery comprises:
carrying out voltage sampling on the output voltage of the high-voltage battery to obtain a first voltage signal;
after the first voltage signal is isolated, a differential voltage signal is output;
and converting the differential voltage signal into a unipolar voltage signal as the reference voltage signal.
10. The method for detecting a state of a relay of an automobile according to claim 9, wherein the isolating sampling of the output voltage of the high-voltage battery to obtain a reference voltage signal of the high-voltage battery further comprises:
filtering the first voltage signal;
and filtering the unipolar voltage signal.
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| CN113484586A (en) * | 2021-07-13 | 2021-10-08 | 上海中科深江电动车辆有限公司 | Device for detecting auxiliary power consumption differential pressure of electric automobile high-voltage relay control |
| CN113752841B (en) * | 2021-09-14 | 2023-05-12 | 珠海格力电器股份有限公司 | Fault determination device and method for all-in-one controller PDU module and automobile |
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