CN117394268A - Automobile power distribution protection circuit and automobile power distribution protection method - Google Patents
Automobile power distribution protection circuit and automobile power distribution protection method Download PDFInfo
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- CN117394268A CN117394268A CN202311282496.1A CN202311282496A CN117394268A CN 117394268 A CN117394268 A CN 117394268A CN 202311282496 A CN202311282496 A CN 202311282496A CN 117394268 A CN117394268 A CN 117394268A
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- 230000017525 heat dissipation Effects 0.000 claims description 6
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Classifications
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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
- H02H3/08—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 current
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- 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
- B60R16/0207—Wire harnesses
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- 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
- B60R16/023—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 transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H5/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection
- H02H5/04—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal non-electric working conditions with or without subsequent reconnection responsive to abnormal temperature
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- Automation & Control Theory (AREA)
- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
Abstract
The application discloses an automobile power distribution protection circuit and an automobile power distribution protection method. The automobile power distribution protection circuit comprises: the electric equipment, the driving chip is connected with the electric equipment through the vehicle pencil, is used for obtaining the first current signal that passes through the vehicle pencil, control chip, with the driving chip electricity is connected, is used for based on the first current signal that the driving chip of obtaining sent, confirm with the pencil temperature of the vehicle pencil that the electric equipment is connected in the car distribution protection circuit, and based on the pencil temperature, confirm the control command that controls the vehicle pencil, the driving chip is still used for receiving the control command, under the circumstances that confirm that the control command is disconnection between the vehicle pencil with connect between the electric equipment, control the pencil with connect disconnection between the electric equipment. The power distribution circuit is protected, and meanwhile, the wiring harness cost and the space in a vehicle are saved.
Description
Technical Field
The application relates to the technical field of automobile power distribution, in particular to an automobile power distribution protection circuit and an automobile power distribution protection method.
Background
Traditional automobile power distribution is that a block terminal is arranged at the automobile cab, and this block terminal is used for carrying out the distribution to the consumer of full car, and this block terminal mainly comprises fusing fuse and relay combination.
Traditional car distribution technique, when car pencil breaks down, realize the protection to distribution circuit through fusing the fuse, above-mentioned distribution circuit protection mode needs to install the block terminal in the place of easily dismantling, so along with the increase of on-vehicle electronic equipment quantity, on-vehicle electronic equipment's pencil needs to wind the position of block terminal, is connected with the block terminal, has so increased the pencil cost and the wiring degree of difficulty of car. And the fuse can only be replaced and maintained after being blown, so that the use cost is increased. Meanwhile, the volume and internal resistance of the relay are large, and space and power consumption are wasted.
Disclosure of Invention
An object of the embodiments of the present application is to provide an automobile power distribution protection circuit and an automobile power distribution protection method, so as to save the wire harness cost and the space in an automobile while protecting the power distribution circuit.
The technical scheme of the application is as follows:
in a first aspect, an automotive power distribution protection circuit is provided, the circuit comprising:
The electric equipment comprises an electric device,
the driving chip is electrically connected with the electric equipment through a vehicle wire harness and is used for acquiring a first current signal of the vehicle wire harness;
the control chip is electrically connected with the driving chip and is used for determining the wire harness temperature of a vehicle wire harness connected with the electric equipment in the automobile power distribution protection circuit based on the first current signal sent by the driving chip and determining a control command for controlling the vehicle wire harness based on the wire harness temperature,
the driving chip is further used for controlling connection disconnection between the wire harness and the electric equipment under the condition that the control command is determined to disconnect the connection between the wire harness of the vehicle and the electric equipment based on the control command.
In a second aspect, there is provided an automotive power distribution protection method applied to the automotive power distribution protection circuit of the first aspect, the method including:
a first current signal of a vehicle harness connected to the powered device is obtained,
determining a wire harness temperature of the vehicle wire harness based on the first current signal,
determining a control command for controlling the vehicle harness based on the harness temperature,
And controlling disconnection between the wire harness and the electric equipment under the condition that the control command is determined to disconnect the connection between the wire harness of the vehicle and the electric equipment based on the control command.
In a third aspect, an automotive power distribution protection device applied to an automotive power distribution protection circuit, where the automotive power distribution protection circuit is the automotive power distribution protection circuit according to the first aspect, includes:
an acquisition module for acquiring a first current signal of a vehicle wire harness connected with electric equipment,
a first determination module for determining a wire harness temperature of the vehicle wire harness based on the first current signal,
a second determination module for determining a control command for controlling the vehicle harness based on the harness temperature,
and the control module is used for controlling the disconnection between the wire harness and the electric equipment under the condition that the control command is determined to disconnect the connection between the wire harness of the vehicle and the electric equipment based on the control command. The whole is
In a fourth aspect, an embodiment of the present application provides an electronic device, where the electronic device includes a processor, a memory, and a program or an instruction stored in the memory and capable of running on the processor, where the program or the instruction is executed by the processor to implement the steps of any one of the embodiments of the present application for an automotive power distribution protection method applied to an automotive power distribution protection circuit.
In a fifth aspect, embodiments of the present application provide a readable storage medium, where a program or an instruction is stored, where the program or the instruction, when executed by a processor, implement the steps of the method for protecting power distribution of an automobile, where the method is applied to a power distribution protection circuit of an automobile in any one of embodiments of the present application.
In a sixth aspect, embodiments of the present application provide a computer program product, where instructions in the computer program product, when executed by a processor of an electronic device, enable the electronic device to perform the steps of any one of the embodiments of the present application of an automotive power distribution protection method applied to an automotive power distribution protection circuit.
The technical scheme provided by the embodiment of the application at least brings the following beneficial effects:
in the automobile power distribution protection circuit provided by the embodiment of the application, the circuit comprises electric equipment, a driving chip and a control chip, wherein the driving chip is electrically connected with the electric equipment through a vehicle wire harness and is used for acquiring a first current signal of the vehicle wire harness, the control chip is electrically connected with the driving chip and is used for determining the wire harness temperature of the vehicle wire harness connected with the electric equipment in the automobile power distribution protection circuit based on the first current signal transmitted by the driving chip, and determining a control command for controlling the vehicle wire harness based on the wire harness temperature, the driving chip is further used for controlling the disconnection and the closing of the connection between the vehicle wire harness and the electric equipment based on the control command, and because the automobile power distribution protection circuit provided by the embodiment of the application is not required to be provided with a fuse and a relay, the hardware cost is saved, the control chip is directly connected with the electric equipment of an automobile, the fuse is not required to be wound first like the prior art, then the control chip is connected, the wiring cost is saved, and the wiring difficulty is reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application and do not constitute an undue limitation on the application.
Figure 1 is a schematic diagram of an automotive power distribution protection circuit according to an embodiment of a first aspect of the present application,
figure 2 is a flow chart of an automotive power distribution protection method applied to an automotive power distribution protection circuit according to an embodiment of the second aspect of the present application,
figure 3 is a schematic diagram of temperature versus time for different input currents according to an embodiment of the second aspect of the present application,
FIG. 4 is a calibration parameter I according to an embodiment of the second aspect of the present application OC When=10a, j=1, the current is actually measured by the direct current 14A, the wire harness is a schematic diagram of the change curve of temperature with time in the current sampling period of 1ms,
FIG. 5 is a calibration parameter I according to an embodiment of the second aspect of the present application OC When 10a and 1 are combined, a peak 14A is simulated and input to the vehicle wire harness, a curve diagram of the temperature of the vehicle wire harness along with the current is shown in the period 1s of sine wave current signal,
Figure 6 is a schematic diagram of the relationship between the load approximation curve, the algorithm protection curve and the harness loading curve according to the embodiment of the second aspect of the present application,
figure 7 is a schematic diagram of different types of load currents according to an embodiment of the second aspect of the present application,
figure 8 is a schematic structural diagram of an automotive power distribution protection device applied to an automotive power distribution protection circuit according to an embodiment of a third aspect of the present application,
fig. 9 is a schematic structural diagram of an electronic device according to a fourth embodiment of the present application.
Detailed Description
In order to enable those skilled in the art to better understand the technical solutions of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are intended to be illustrative of the application and are not intended to be limiting. It will be apparent to one skilled in the art that the present application may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present application by showing examples of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that embodiments of the present application described herein may be implemented in sequences other than those illustrated or otherwise described herein. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present application. Rather, they are merely examples consistent with some aspects of the present application as detailed in the accompanying claims.
As described in the background section, the prior art has the problems of high wire harness cost and high wire harness deployment difficulty in the prior art, in order to solve the problems, the embodiment of the application provides an automobile power distribution protection circuit, a method, a device, equipment, a medium and a program product, the automobile power distribution protection circuit provided in the embodiment of the application comprises electric equipment, a driving chip, a control chip and a control chip, wherein the driving chip is electrically connected with the electric equipment through a wire harness of an automobile, the control chip is used for acquiring a first current signal of the wire harness of the automobile, the control chip is connected with the driving chip, the wire harness temperature of the wire harness connected with the electric equipment in the automobile power distribution protection circuit is determined based on the acquired first current signal sent by the driving chip, and a control command for controlling the wire harness of the automobile is determined based on the wire harness temperature, the driving chip is also used for controlling the disconnection and closing of the wire harness of the automobile based on the control command, because a fuse and a relay are not required to be arranged in the automobile power distribution protection circuit provided in the embodiment of the application, the hardware cost is saved, the control chip is directly connected with the electric equipment of the automobile, the electric equipment of the application of the prior art, a first current signal is not required to be wound around the fuse, then the control chip is connected with the control chip, the control chip is used, the wire harness is connected with the electric equipment, and the wire harness is disconnected with the electric equipment is connected with the electric equipment, the electric equipment is disconnected with the electric equipment, and the electric equipment is connected with the electric equipment, and the electric equipment is required to be connected with the electric equipment through the electric equipment and the electric equipment is under the control command control device and has the control device and the control device is required to be opened and has high electrical equipment and has high electrical safety, the automobile power distribution protection circuit provided by the embodiment of the application protects the power distribution circuit, saves the wire harness cost and saves the space in the automobile.
The automobile power distribution protection circuit provided by the embodiment of the application is described in detail through specific embodiments and application scenes thereof with reference to the accompanying drawings.
Fig. 1 is a schematic structural diagram of an automotive power distribution protection circuit provided in an embodiment of the present application, and as shown in fig. 1, the automotive power distribution protection circuit provided in an embodiment of the present application may include an electrical device 110, a driving chip 120 and a control chip 130.
Powered device 110,
the driving chip 120 is electrically connected with the electric equipment 110 through the vehicle wire harness 140, and is used for acquiring a first current signal of the vehicle wire harness,
a control chip 130 electrically connected to the driving chip 120 for determining a wire harness temperature of a vehicle wire harness connected to the electric device in the power distribution protection circuit of the automobile based on the obtained first current signal transmitted from the driving chip, and determining a control command for controlling the vehicle wire harness based on the wire harness temperature,
the driving chip 120 is further configured to control disconnection between the vehicle harness and the electric device, based on the control command, in a case where the control command is determined to disconnect the vehicle harness from the electric device.
The electric equipment can be equipment which needs to be powered in the automobile, for example, a motor, a vehicle-mounted display screen, an in-car reading lamp and the like.
The vehicle harness may be a harness connected to electrical equipment.
The first current signal may be a current signal through a vehicle harness connected to the powered device.
In some embodiments of the present application, the temperature of the wire harness may be increased as the current signal passes through the wire harness, where the wire harness temperature may be a temperature of the vehicle wire harness determined from the current signal.
The control command may be a command to control the vehicle harness, for example, may be to disconnect the vehicle harness from the powered device.
In some embodiments of the present application, the driver chip 120 may be a type of chip with both direct drive and pulse width modulation (Pulse width modulation, PWM) drive modes.
The control chip is integrated with a specific circuit protection algorithm program so as to protect the circuit of the automobile power distribution protection circuit based on the circuit protection algorithm program.
It should be noted that, for any electric device in the automobile, the above manner may be used to calculate the wire harness temperature of the vehicle wire harness connected to the electric device, so as to control whether to disconnect the vehicle wire harness connected to the electric device based on the wire harness temperature.
In the embodiment of the application, the automobile power distribution protection circuit that this application embodiment provided includes the consumer, and driving chip is connected through the vehicle pencil electricity with the consumer for obtain the first current signal of vehicle pencil, control chip is connected with driving chip electricity, is used for confirming the pencil temperature of the vehicle pencil that is connected with the consumer in the automobile power distribution protection circuit based on the first current signal that the driving chip obtained sent, and based on the pencil temperature, confirm the control command who controls the vehicle pencil, driving chip still is used for controlling disconnection and closure of being connected between vehicle pencil and the consumer based on the control command, because need not to set up fuse and relay in the automobile power distribution protection circuit that this application embodiment provided, saved the hardware cost, and this control chip is directly connected with the consumer of car like prior art, need not to bypass the fuse earlier, then connect control chip again, and saved the wiring cost, and the degree of difficulty of wiring has been reduced in this application embodiment, and control chip can confirm the temperature of this vehicle according to the first current signal of the vehicle pencil that passes through the consumer, based on this pencil temperature, control disconnection and if the consumer is connected with the consumer is the consumer, and the consumer is connected with the consumer under the harness, the condition that the control command is connected with the consumer is the harness, and the consumer is connected with the consumer is implemented in the automobile power distribution protection circuit, and the automobile is connected with the harness, the condition of the harness is saved, and the automobile is protected, the cost is saved, and the automobile is connected with the electrical harness is protected.
In some embodiments of the present application, at least one sampling interface may be integrated into the driving chip 120, where each sampling interface is configured to obtain the first current signal of the vehicle wire harness.
In some embodiments of the present application, each sampling interface may further feed back data of the driving chip to the control chip, which may specifically be, for example, a current signal of the power distribution protection circuit, an instruction about whether the temperature of the wire harness reaches the self protection mechanism, and so on.
In some embodiments of the present application, the first current signal may be collected by means of a sampling resistor and a voltage processing module, in addition to the first current signal may be collected by means of the driving chip 120.
It should be noted that, instead of integrating the acquisition module (such as a sampling interface, a sampling resistor, or a voltage processing module) for acquiring the first current signal in the driving chip 120, a device for acquiring the first current signal may be configured outside the power distribution protection circuit of the automobile, and the device may send the first current signal to the driving chip 120 after acquiring the first current signal.
In the embodiment of the application, at least one path of sampling interface is integrated in the driving chip, and each path of sampling interface is used for acquiring the first current signal of the vehicle wire harness, so that other external devices are not required to be arranged, and the hardware cost is saved.
The automobile power distribution protection circuit may further include:
the sampling resistor 150, connected to the driving chip 120, is located on the vehicle harness connected to the electrical equipment,
the voltage processing module 160 is electrically connected with the sampling resistor 150, and is configured to obtain a voltage signal obtained by sampling the second current signal of the resistor, process the voltage signal to obtain a processed voltage signal, send the processed voltage signal to the control chip 130,
the control chip 130 is configured to obtain the processed voltage signal, convert the processed voltage signal into a current signal, obtain a first current signal, determine a wire harness temperature of a vehicle wire harness connected to the electric device in the automobile power distribution protection circuit based on the first current signal, and determine a control command for controlling the vehicle wire harness based on the wire harness temperature.
Wherein the second current signal may be a current signal through a sampling resistor.
In some embodiments of the present application, referring to fig. 1, when a second current signal passes through the sampling resistor, a voltage signal passing through the sampling resistor may be obtained based on the internal resistance of the sampling resistor and the second current signal, and then the voltage signal is processed by a voltage processing module, for example, the voltage processing module may be an amplifier, and then the voltage signal after the amplification may be amplified and sent to a control chip, and the control chip may convert the voltage signal after receiving the processed voltage signal into a current signal, thereby obtaining a first current signal, so that the sampling resistor and the voltage processing module implement feedback of the current signal.
In some embodiments of the present application, under a load working condition, that is, under an electric device working condition, the control chip calculates a wire harness temperature of the vehicle wire harness through a wire harness protection algorithm according to a collected first current signal of the vehicle wire harness, then completes overload protection of the vehicle wire harness according to the calculated wire harness temperature, and can design a maximum current threshold to complete short-circuit protection of the vehicle wire harness.
How the effective overload protection of the vehicle harness connected to the electric equipment is achieved based on the automobile power distribution protection circuit in the above embodiment is described in detail below.
Fig. 2 is a schematic flow chart of an automotive power distribution protection method applied to an automotive power distribution protection circuit according to an embodiment of the present application, where an execution subject of the automotive power distribution protection method applied to the automotive power distribution protection circuit may be the automotive power distribution protection circuit of fig. 1.
As shown in fig. 2, the method for protecting the power distribution of the automobile, which is applied to the power distribution protection circuit of the automobile, provided in the embodiment of the application may include steps 210 to 240.
Step 210, a first current signal of a vehicle wire harness connected with electric equipment is obtained.
Step 220, determining a wire harness temperature of the vehicle wire harness based on the first current signal.
Step 230, determining a control command for controlling the vehicle wire harness based on the wire harness temperature.
And 240, controlling the disconnection between the vehicle wire harness and the electric equipment under the condition that the control command is determined to disconnect the connection between the vehicle wire harness and the electric equipment.
In the embodiment of the application, the wire harness temperature of the vehicle wire harness is determined based on the first current signal of the vehicle wire harness connected with the electric equipment, then the control command for controlling the vehicle wire harness is determined based on the wire harness temperature, under the condition that the control command is determined to disconnect the connection between the vehicle wire harness and the electric equipment, the disconnection between the vehicle wire harness and the electric equipment is controlled, the wire harness temperature of the vehicle wire harness can be determined according to the first current signal of the vehicle wire harness passing through the electric equipment, whether the vehicle wire harness connected with the electric equipment is disconnected or not is controlled based on the wire harness temperature, and under the condition that the control command is determined to disconnect the connection between the vehicle wire harness and the electric equipment, the connection between the wire harness and the electric equipment is controlled, and the vehicle wire harness connected with the electric equipment is protected.
In some embodiments of the present application, in order to accurately determine the wire harness temperature of the vehicle wire harness, step 220 may specifically include:
based on the first current signal, and Joule's law, a first heat generated by the vehicle harness due to the first current signal is calculated,
calculating second heat emitted from the vehicle harness to the outside based on a temperature difference between the first heat and an outside temperature,
constructing a temperature change model of the vehicle wire harness according to the first heat and the second heat,
obtaining a target equivalent model of the wire harness temperature and the first current signal according to the temperature change model,
based on the target equivalent model, a wire harness temperature of the vehicle wire harness is calculated.
The first heat may be heat generated by the vehicle wire harness due to the first current signal.
The second heat may be heat generated by the vehicle harness due to the first current signal, and heat dissipated by a temperature difference from an outside temperature.
The temperature change model may be a model of a temperature change of the vehicle wire harness constructed from the first heat and the second heat.
The target equivalent model may be a model obtained from the temperature change model for characterizing a correspondence between the wire harness temperature and the first current signal.
In some embodiments of the present application, an algorithm model, i.e., a target equivalent model, that can effectively predict the wire harness temperature of a vehicle wire harness is designed by modeling according to the actual I2T principle of the vehicle wire harness.
When a first current signal passes through the vehicle wire harness, a heating model of the vehicle wire harness shown in the following formula (1) can be obtained according to the first current signal and Joule's law, and according to the model, the first heat generated by the vehicle wire harness due to the first current signal can be calculated:
P Heat ＝I 2 *R (1)
wherein P is Heat The first heat quantity is I is a current value corresponding to a first current signal passing through the vehicle wire harness, and R is the internal resistance of the vehicle wire harness.
In some embodiments of the present application, the temperature of the wire harness increases due to the joule effect, the temperature of the wire harness of the vehicle is different from the external temperature, the wire harness of the vehicle is cooled by heat dissipation to the environment, and the cooling model of the wire harness of the vehicle can be expressed as the following formula (2):
P Cool ＝ΔT*K (2)
wherein, deltaT is the temperature difference between the temperature of the vehicle wire harness and the external temperature, and K is the heat dissipation coefficient.
Through the above formula (2), the second heat of the vehicle harness radiating outward can be obtained.
According to the first heat and the second heat, a temperature change model of the vehicle wire harness can be obtained, and further according to the temperature change model, a target equivalent model of the wire harness temperature and the first current signal is obtained, and based on the target equivalent model, the wire harness temperature of the vehicle wire harness can be calculated.
In the embodiment of the application, the first heat generated by the vehicle wire harness due to the first current signal is calculated based on the first current signal and Joule's law, the second heat emitted by the vehicle wire harness outwards is calculated based on the temperature difference between the first heat and the external temperature, the temperature change model of the vehicle wire harness is constructed according to the first heat and the second heat, the target equivalent model of the wire harness temperature and the first current signal is obtained according to the temperature change model, and the wire harness temperature of the vehicle wire harness can be accurately calculated based on the target equivalent model.
In some embodiments of the present application, in order to accurately determine the temperature change model of the vehicle wire harness, the constructing the temperature change model of the vehicle wire harness according to the first heat and the second heat may specifically include:
according to the first heat and the second heat, a temperature change model of the vehicle wire harness shown in the following formula (3) is constructed:
(3)
wherein C is the specific heat melting coefficient.
In some embodiments of the present application, in order to accurately obtain a target equivalent model of the wire harness temperature and the first current signal, the obtaining, according to the temperature change model, the target equivalent model of the wire harness temperature and the first current signal may specifically include:
Deriving the temperature change model to obtain a derived temperature change model,
based on the temperature change model after derivation, carrying out form transformation on the temperature change model after derivation to obtain a temperature difference model,
based on the temperature difference model, calculating a first temperature when the vehicle wire harness passes through a preset fixed current and the time is infinitely long,
and obtaining a target equivalent model of the wire harness temperature and the first current signal according to the first temperature.
The first temperature may be a temperature obtained by calculating a time when the vehicle wire harness passes through a preset fixed current according to the derived temperature change model under the condition of infinite length.
The preset fixed current may be a preset fixed current that the vehicle harness passes through.
In some embodiments of the present application, the above formula (3) is derived to obtain a derived temperature variation model, and then the derived temperature variation model is transformed to obtain a temperature difference model, and then the vehicle wire harness passing through the preset fixed current I can be calculated based on the temperature difference model OC In this case, the time is the first temperature at infinite ≡.
After the vehicle wire harness is obtained, the vehicle wire harness passes through a preset fixed current I OC When the time is infinite, the target equivalent model of the wire harness temperature and the first current signal can be obtained according to the first temperature after the first temperature of the wire harness of the vehicle is infinite.
In some embodiments of the present application, the obtaining, according to the first temperature, a target equivalent model of the wire harness temperature and the first current signal may specifically include:
setting the wire harness as a preset wire harness, calculating a temperature threshold value when the vehicle wire harness passes through a preset fixed current of preset time based on the first temperature,
discretizing the temperature change model to obtain an initial equivalent model of the wire harness temperature and the first current signal,
and performing form transformation on the initial equivalent model to obtain a target equivalent model of the wire harness temperature and the first current signal.
The preset wire harness may be a preset specification of the vehicle wire harness, and after the specification of the vehicle wire harness is determined, the values of C and K are also fixed, that is, different vehicle wire harnesses have their corresponding C and K.
The temperature threshold may be a highest temperature of the vehicle harness calculated from the first temperature when the vehicle harness passes a preset fixed current for a preset time.
The initial equivalent model may be a model obtained by discretizing the temperature change model.
In some embodiments of the present application, C, K may be considered fixed in the case where the vehicle harness is a preset harness The value, i.e. C/k=j, when passing T N Fixed current I in time OC When the temperature threshold of the vehicle wire harness may be as shown in the following formula (4):
because the embedded controller can only process discrete signals, the above formula (3) can be discretized to obtain an initial equivalent model of the wire harness temperature and the first current signal as shown in the following formula (5), wherein the formula (5) is a recursive formula for describing the relationship between the current time and the temperature at the previous time:
from the above formula (4), R/C and DeltaT can be fed back max Inversely proportional. When the value of R/C is determined, only one determined DeltaT can be obtained max Here, it may be first assumed that R/c=α/Δt, and the above formula (5) may be expressed as the following formula (6), that is, the form transformation of the formula (5) may be performed, so that the target equivalent model may be obtained:
wherein DeltaT k For the temperature of the vehicle harness at the current moment, deltaT k-1 The temperature of the vehicle wire harness at a time immediately before the current time.
The target equivalent model between the first current signal and the wire harness temperature is obtained according to the formula (6), and the wire harness temperature value of the vehicle wire harness can be obtained according to the target equivalent model and the current signal in the vehicle wire harness.
In some embodiments of the present application, according to the target equivalent model, the temperature threshold of the vehicle wire harness may be changed in form, so as to obtain a result shown in the following formula (7), that is, the following formula (7) may be derived according to the above formula (4):
In some embodiments of the present application, at ΔT k Greater than or equal to DeltaT max In the event that the vehicle harness has a harness temperature greater than the maximum current threshold, the control command may be determined to disconnect the vehicle harness from the powered device, i.e., disconnect the vehicle harness from the powered device. At DeltaT k Greater than or equal to DeltaT max The target equivalent model can be expressed by the following formula (8):
the temperature threshold can be expressed by the following formula (9):
in the embodiment of the present application, by the above-described formulas (1) to (5), the target equivalent model shown in formula (6) can be obtained, from which the wire harness temperature value of the vehicle wire harness can be obtained.
In some embodiments of the present application, there are two variables that can be marked in equation (8) above: i OC And J, after setting the two values, according to the model algorithm, a relation diagram of the bearable time of a specific wire harness under different input currents can be obtained, as shown in FIG. 3, wherein a curve 31 in FIG. 3 is I OC Time-dependent current profile for a sampling period of 1ms for j=1, =10a, curve 32 is I OC Time-dependent current profile corresponding to a sampling period of 1ms for j=2, =20a, curve 33 being I OC The curves 31, 32 and 33 can be considered as the load I-T curves of the virtual wire harness described in the algorithm, and in practical application, by changing two calibration values, the "different vehicle wire harnesses" can be equivalently considered as being adopted, as long as the actual current is in the stripAnd the device can normally operate without overload under the piece. Thus, when selecting an actual harness, as long as the actual load I-T curve is above the corresponding curve as shown in FIG. 3 (e.g., harness actual I OC When the sampling period is 1ms and j=1, =10a, the corresponding loaded I-T curve is located above the curve 31, and the actual I is the wire harness OC =20a, sampling period 1ms, j=2, the corresponding loaded I-T curve is above curve 32, the actual I of the harness OC When the sampling period is 1ms and the sampling period is j=2, the corresponding load I-T curve is located above the curve 33, which indicates that the temperature of the actual wire harness exceeds the temperature threshold of the wire harness, and when the whole algorithm in the automobile power distribution protection circuit calculates that the temperature of the actual wire harness exceeds the temperature threshold of the wire harness, the wire harness connection can be disconnected, so that overload protection of the actual wire harness can be realized. As shown in fig. 3, curves for a multiple set configuration are given.
In one example, when setting the calibration parameter I OC When =10a, j=1, the current sampling period is 1ms when the direct current 14A is actually passed, and the trend and schematic diagram of the calculated current are shown in the upper graph in fig. 4. When the temperature of the wire harness reaches 100000 (the temperature threshold represented by the straight line 41 in the lower diagram in fig. 4), it is indicated that the overload protection condition is satisfied, that is, the actual temperature of the wire harness exceeds the temperature threshold of the wire harness, an algorithm in the automobile power distribution protection circuit generates an overload protection mechanism, and the connection between the wire harness and the corresponding electric equipment is disconnected.
In another example, when setting the calibration parameter I OC When the peak value 14A shown in the upper graph in fig. 5 is inputted in a simulation manner and the sine wave current signal of the period 1s is inputted in a simulation manner, the trend graph of the temperature change with the current shown in the lower graph in fig. 5 is generated.
Note that, the ordinate in the lower graph in fig. 4 is a value obtained by converting the count value of the temperature, because the calculated wire harness temperature may be a decimal, but the calculation resources occupied by the computer when operating the decimal are large, so that the computer has higher calculation capability when calculating the count value.
At the bookIn some examples of the application, for convenience and science, option I OC And T N The two parameters can be arranged below the protection curve shown in fig. 3 so as to prevent the actual temperature of the wire harness from exceeding the temperature threshold of the wire harness, thereby causing a protection mechanism of an overload algorithm in an automobile power distribution protection circuit and affecting the actual operation of electric equipment. If the load capacity curve of the actual wire harness test is above the protection curve shown in fig. 3, the load capacity of the actual wire harness needs to be kept with a margin to ensure that the wire harness is not damaged in the actual operation process, as shown in fig. 6, the I is preliminarily determined by the relative position relationship of three wires OC And J, wherein the curve 61 is a load approximation curve, the curve 61 is used for representing a change curve of current passing through electric equipment along with time, the curve 62 is an algorithm protection curve, namely, the curve 62 is a change curve of a current threshold value of a wire harness connected with the electric equipment represented by the curve 61 along with time calculated according to the calculation mode, and the curve 63 is a wire harness load curve, namely, the curve 63 is a change curve of the current of the wire harness connected with the electric equipment represented by the curve 61 along with time.
In some embodiments of the present application, in order to more abstract describe the actual current that the wire harness passes through, the load current may be divided into two types according to the characteristics of the load current of the automotive electronic device, where the first type of current is an impact current when the device is started, the current gradually stabilizes after passing through the impact current, and the final current only fluctuates in a small range, which may be approximately as shown in the upper graph in fig. 7, i.e. there is a section of impact current when the device starts to power up, and then the current approximately stabilizes to a fixed current. The second type of current is a normal current existing in the line, and when a certain device on the line is turned on, a surge current appears in the circuit, but the occurrence time of the surge current is uncertain, as shown in the lower graph in fig. 7.
The embodiment of the application can take 1.2 times of the stable current of the two working conditions shown in the figure 7 as I OC The current is regulated, and the J parameter is regulated to make the real current curve of the wire harness be below the protection curve, so that the real current can be properly amplified for preventing false triggering under special conditionsAccording to the requirements of the use environment and the characteristic of the wire harness of the automobile, the limit environment of the wire harness is considered to be the maximum external temperature T1, the maximum temperature of the wire harness, which is not exceeded by the wire temperature, is T2, aiming at the first type of current, as the impact current of the electric equipment occurs at the initial moment, the current cannot change greatly after being stable, the wire harness can be tested to pass through various currents with different magnitudes in the T1 environment, the time data when the wire temperature reaches T2 is drawn, the corresponding I-T curve is drawn, and when the I-T curve is above an algorithm protection curve (namely, the curve shown in fig. 3), the wire harness meets the load requirement. For the second working condition, since the impact current does not necessarily occur at the initial moment, if the wire temperature is close to T2 when the wire harness is in the stable current for a long time, the wire harness may generate smoke when the impact current occurs, in order to solve the problem, in the embodiment of the application, the protection limit of T2 in the first working condition is changed to t1+ (T2-T1)/2, in this case, firstly, the impact current is assumed to occur at the initial moment, the rising temperature of the wire harness is smaller than (T2-T1)/2, and the wire harness temperature rise caused by considering the continuous current in the actual operation process is also smaller than (T2-T1)/2, when the wire harness reaches the thermal balance due to the stable current, the impact current is generated at this moment, and the wire harness temperature does not exceed T2 when the heat dissipation capacity caused by the temperature difference increase in the whole impact current process is larger than the heat dissipation capacity of the impact current generated at the initial moment, so that the effective protection of the wire harness is realized.
It should be noted that, in the method for protecting the power distribution of the automobile applied to the power distribution protection circuit of the automobile provided in the embodiment of the present application, the execution body may be an automobile power distribution protection device applied to the power distribution protection circuit of the automobile, or a control module for executing the method for protecting the power distribution of the automobile applied to the power distribution protection circuit of the automobile in the automobile power distribution protection device applied to the power distribution protection circuit of the automobile.
Based on the same inventive concept as the automobile power distribution protection method applied to the automobile power distribution protection circuit, the application also provides an automobile power distribution protection device applied to the automobile power distribution protection circuit. The following describes in detail an automotive power distribution protection device applied to an automotive power distribution protection circuit according to an embodiment of the present application with reference to fig. 8.
Fig. 8 is a schematic structural view showing an automotive power distribution protection device applied to an automotive power distribution protection circuit according to an exemplary embodiment. The automotive power distribution protection circuit may be the automotive power distribution protection circuit described above in the embodiment shown in fig. 1.
As shown in fig. 8, the automobile power distribution protection device 800 applied to the automobile power distribution protection circuit may include:
an acquisition module 810 for acquiring a first current signal of a vehicle harness connected to a powered device,
A first determination module 820 for determining a wire harness temperature of the vehicle wire harness based on the first current signal,
a second determining module 830 for determining a control command for controlling the vehicle harness based on the harness temperature,
and the control module 840 is configured to control disconnection between the harness and the electric device, based on the control command, in a case where it is determined that the control command is to disconnect the harness from the electric device.
In the embodiment of the application, the wire harness temperature of the vehicle wire harness is determined based on the first current signal of the vehicle wire harness connected with the electric equipment, then the control command for controlling the vehicle wire harness is determined based on the wire harness temperature, under the condition that the control command is determined to disconnect the connection between the vehicle wire harness and the electric equipment, the disconnection between the vehicle wire harness and the electric equipment is controlled, the wire harness temperature of the vehicle wire harness can be determined according to the first current signal of the vehicle wire harness passing through the electric equipment, whether the vehicle wire harness connected with the electric equipment is disconnected or not is controlled based on the wire harness temperature, and under the condition that the control command is determined to disconnect the connection between the vehicle wire harness and the electric equipment, the connection between the wire harness and the electric equipment is controlled, and the vehicle wire harness connected with the electric equipment is protected.
In some embodiments of the present application, the first determining module 820 may specifically include:
a first calculation unit for calculating a first heat amount of the vehicle harness due to the first current signal based on the first current signal and Joule's law,
a second calculation unit for calculating a second heat emitted outward from the vehicle harness based on a temperature difference between the first heat and an outside temperature,
a construction unit configured to construct a temperature change model of the vehicle harness based on the first heat and the second heat,
a first determining unit for obtaining a target equivalent model of the wire harness temperature and the first current signal according to the temperature change model,
and a third calculation unit configured to calculate a wire harness temperature of the vehicle wire harness based on the target equivalent model.
In some embodiments of the present application, the building element may specifically be configured to:
according to the first heat and the second heat, a temperature change model of the vehicle wire harness is constructed, wherein the model is shown in the following formula:
wherein DeltaT is the temperature difference between the temperature of the vehicle wire harness and the external temperature, C is the specific heat melting coefficient, P Heat Is the first heat, P Heat ＝I 2 * R, I is the current value corresponding to the first current signal, R is the internal resistance of the vehicle wire harness, P Cool For the second heat, P Cool =Δt×k, K is the heat dissipation coefficient.
In some embodiments of the present application, the first determining unit may specifically include:
a first determination subunit, configured to derive the temperature change model to obtain a derived temperature change model,
a first calculation subunit, configured to perform form transformation on the derived temperature variation model based on the derived temperature variation model to obtain a temperature difference model, and calculate a first temperature of the vehicle harness when the vehicle harness passes through a preset fixed current and the time is infinitely long based on the temperature difference model,
and the second determining subunit is used for obtaining a target equivalent model of the wire harness temperature and the first current signal according to the first temperature.
In some embodiments of the present application, the second determining subunit is specifically configured to:
setting the wire harness as a preset wire harness, calculating a temperature threshold of the wire harness when the wire harness passes through the preset fixed current for a preset time based on the first temperature,
discretizing the temperature change model to obtain an initial equivalent model of the wire harness temperature and the first current signal,
And performing form transformation on the initial equivalent model to obtain a target equivalent model of the wire harness temperature and the first current signal.
In some embodiments of the present application, in a case where the vehicle harness is set as a preset harness, C/k=j is set, and the second determining subunit may specifically be configured to:
calculating the passing preset time T of the vehicle wire harness based on the first temperature N Is set to the preset fixed current I OC The temperature threshold at that time is as follows:
in some embodiments of the present application, the second determining subunit may specifically be configured to:
discretizing the temperature change model to obtain an initial equivalent model of temperature and current signals as shown in the following:
wherein DeltaT k For the temperature of the vehicle harness at the current moment, deltaT k-1 The temperature of the vehicle wire harness at a time immediately before the current time.
In some embodiments of the present application, the second determining subunit may specifically be configured to:
the initial equivalent model is transformed according to the following formula to obtain a target equivalent model of the wire harness temperature and the first current signal:
where R/c=α/Δt.
In some embodiments of the present application, based on the target equivalent model, the temperature threshold of the vehicle wire harness is transformed to obtain the following formula:
In some embodiments of the present application, at ΔT k Greater than or equal to DeltaT max And determining that the control command is to disconnect the vehicle harness from the powered device.
In some embodiments of the present application, at ΔT k Greater than or equal to DeltaT max The target equivalent model is expressed as follows:
the temperature threshold is expressed as follows:
the automobile power distribution protection device applied to the automobile power distribution protection circuit provided by the embodiment of the application can be used for executing the automobile power distribution protection method applied to the automobile power distribution protection circuit provided by the embodiment of the method, and the implementation principle and the technical effect are similar, so that the description is omitted here for brevity.
Based on the same inventive concept, the embodiment of the application also provides electronic equipment.
Fig. 9 is a schematic structural diagram of an electronic device according to an embodiment of the present application. As shown in fig. 9, the electronic device may include a processor 901 and a memory 902 storing computer programs or instructions.
In particular, the processor 901 may include a Central Processing Unit (CPU), or an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or may be configured as one or more integrated circuits that implement embodiments of the present invention.
Memory 902 may include mass storage for data or instructions. By way of example, and not limitation, memory 902 may comprise a Hard Disk Drive (HDD), floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or universal serial bus (Universal Serial Bus, USB) drive, or a combination of two or more of the foregoing. The memory 902 may include removable or non-removable (or fixed) media, where appropriate. The memory 902 may be internal or external to the integrated gateway disaster recovery device, where appropriate. In a particular embodiment, the memory 902 is a non-volatile solid state memory. The Memory may include read-only Memory (Read Only Memory image, ROM), random-Access Memory (RAM), magnetic disk storage media devices, optical storage media devices, flash Memory devices, electrical, optical, or other physical/tangible Memory storage devices. Thus, in general, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software comprising computer-executable instructions and when the software is executed (e.g., by one or more processors) it is operable to perform the operations described in the above embodiments provided for an automotive power distribution protection method applied to automotive power distribution protection circuitry.
The processor 901 reads and executes the computer program instructions stored in the memory 902 to implement any one of the automobile power distribution protection methods applied to the automobile power distribution protection circuit in the above-described embodiments.
In one example, the electronic device may also include a communication interface 903 and a bus 910. As shown in fig. 9, the processor 901, the memory 902, and the communication interface 903 are connected to each other via a bus 910, and communicate with each other.
The communication interface 903 is mainly used to implement communication between each module, device, unit, and/or device in the embodiment of the present invention.
Bus 910 includes hardware, software, or both that couple components of an electronic device to each other. By way of example, and not limitation, the buses may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an infiniband interconnect, a Low Pin Count (LPC) bus, a memory bus, a micro channel architecture (MCa) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a video electronics standards association local (VLB) bus, or other suitable bus, or a combination of two or more of the above. Bus 910 may include one or more buses, where appropriate. Although embodiments of the invention have been described and illustrated with respect to a particular bus, the invention contemplates any suitable bus or interconnect.
The electronic equipment can execute the automobile power distribution protection method applied to the automobile power distribution protection circuit in the embodiment of the invention, so that the automobile power distribution protection method applied to the automobile power distribution protection circuit described in any embodiment is realized.
In addition, in combination with the automobile power distribution protection method applied to the automobile power distribution protection circuit in the above embodiment, the embodiment of the invention can be realized by providing a readable storage medium. The readable storage medium has stored thereon program instructions which, when executed by a processor, implement any one of the above embodiments as a method for automotive power distribution protection applied to automotive power distribution protection circuits.
In addition, in combination with the automobile power distribution protection method applied to the automobile power distribution protection circuit in the above embodiment, the embodiment of the present invention may provide a computer program product, where instructions in the computer program product when executed by a processor of an electronic device cause the electronic device to execute the automobile power distribution protection method applied to the automobile power distribution protection circuit in any one of the above embodiments.
It should be understood that the invention is not limited to the particular arrangements and instrumentality described above and shown in the drawings. For the sake of brevity, a detailed description of known methods is omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method processes of the present invention are not limited to the specific steps described and shown, and those skilled in the art can make various changes, modifications and additions, or change the order between steps, after appreciating the spirit of the present invention.
The functional blocks shown in the above-described structural block diagrams may be implemented in hardware, software, firmware, or a combination thereof. When implemented in hardware, it may be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), suitable firmware, a plug-in, a function card, or the like. When implemented in software, the elements of the invention are the programs or code segments used to perform the required tasks. The program or code segments may be stored in a machine readable medium or transmitted over transmission media or communication links by a data signal carried in a carrier wave. A "machine-readable medium" may include any medium that can store or transfer information. Examples of machine-readable media include electronic circuitry, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio Frequency (RF) links, and the like. The code segments may be downloaded via computer networks such as the internet, intranets, etc.
It should also be noted that the exemplary embodiments mentioned in this disclosure describe some methods or systems based on a series of steps or devices. However, the present invention is not limited to the order of the above-described steps, that is, the steps may be performed in the order mentioned in the embodiments, or may be performed in a different order from the order in the embodiments, or several steps may be performed simultaneously.
Aspects of the present application are described above with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions/acts specified in the flowchart and/or block diagram block or blocks. Such a processor may be, but is not limited to being, a general purpose processor, a special purpose processor, an application specific processor, or a field programmable logic circuit. It will also be understood that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware which performs the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In the foregoing, only the specific embodiments of the present invention are described, and it will be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the systems, modules and units described above may refer to the corresponding processes in the foregoing method embodiments, which are not repeated herein. It should be understood that the scope of the present invention is not limited thereto, and any equivalent modifications or substitutions can be easily made by those skilled in the art within the technical scope of the present invention, and they should be included in the scope of the present invention.
Claims (10)
1. An automotive power distribution protection circuit, the automotive power distribution protection circuit comprising:
the electric equipment comprises an electric device,
the driving chip is electrically connected with the electric equipment through a vehicle wire harness and is used for acquiring a first current signal passing through the vehicle wire harness,
the control chip is electrically connected with the driving chip and is used for determining the wire harness temperature of a vehicle wire harness connected with the electric equipment in the automobile power distribution protection circuit based on the first current signal sent by the driving chip and determining a control command for controlling the vehicle wire harness based on the wire harness temperature,
the driving chip is further used for receiving the control command, and controlling connection disconnection between the wire harness and the electric equipment under the condition that the control command is determined to disconnect the connection between the wire harness of the vehicle and the electric equipment.
2. The automotive power distribution protection circuit of claim 1, wherein at least one sampling interface is integrated into the driver chip, each sampling interface being configured to obtain a first current signal of the vehicle wiring harness.
3. The automotive power distribution protection circuit of claim 1, further comprising:
The sampling resistor is connected with the driving chip and positioned on the vehicle wire harness connected with the electric equipment,
the voltage processing module is electrically connected with the sampling resistor and is used for acquiring a voltage signal obtained by a second current signal of the sampling resistor, processing the voltage signal to obtain a processed voltage signal and sending the processed voltage signal to the control chip,
the control chip is used for acquiring the processed voltage signal, converting the processed voltage signal into a current signal, obtaining the first current signal, determining the wire harness temperature of a vehicle wire harness connected with electric equipment in the automobile power distribution protection circuit based on the first current signal, and determining a control command for controlling the vehicle wire harness based on the wire harness temperature.
4. An automobile power distribution protection method applied to an automobile power distribution protection circuit, characterized in that the automobile power distribution protection circuit is the automobile power distribution protection circuit according to any one of claims 1 to 3, and the method comprises:
a first current signal of a vehicle harness connected to the powered device is obtained,
Determining a wire harness temperature of the vehicle wire harness based on the first current signal,
determining a control command for controlling the vehicle harness based on the harness temperature,
and under the condition that the control command is determined to disconnect the vehicle wire harness from the electric equipment, controlling the disconnection between the vehicle wire harness and the electric equipment.
5. The method of claim 4, wherein the determining the wire harness temperature of the vehicle wire harness based on the first current signal comprises:
calculating a first heat amount of the vehicle wire harness due to the first current signal based on the first current signal and Joule's law,
calculating second heat emitted by the vehicle wire harness outwards based on the temperature difference between the first heat and the external temperature,
constructing a temperature change model of the vehicle wire harness according to the first heat and the second heat,
obtaining a target equivalent model of the wire harness temperature and the first current signal according to the temperature change model,
and calculating the wire harness temperature of the vehicle wire harness based on the target equivalent model.
6. The method of claim 5, wherein the obtaining a target equivalent model of the wire harness temperature and the first current signal from the temperature variation model comprises:
Deriving the temperature change model to obtain a derived temperature change model,
based on the temperature change model after derivation, a temperature difference model is obtained,
based on the temperature difference model, calculating a first temperature of the vehicle wire harness when the vehicle wire harness passes through the preset fixed current under the condition that the time is infinitely long,
and obtaining a target equivalent model of the wire harness temperature and the first current signal according to the first temperature.
7. The method of claim 6, wherein the temperature change model of the vehicle wiring harness is represented by the formula:
wherein DeltaT is the temperature difference between the temperature of the vehicle wire harness and the external temperature, C is the specific heat melting coefficient, P Heat Is the first heat, P Heat ＝I 2 * R, I is the current value corresponding to the first current signal, R is the internal resistance of the vehicle wire harness, P Cool For the second heat, P Cool =Δt×k, K is the heat dissipation coefficient.
8. The method of claim 7, wherein the obtaining a target equivalent model of the wire harness temperature and the first current signal from the first temperature comprises:
setting the wire harness as a preset wire harness, calculating a temperature threshold value when the vehicle wire harness passes through the preset fixed current for a preset time based on the first temperature,
Discretizing the temperature change model to obtain an initial equivalent model of the wire harness temperature and the first current signal,
and performing form transformation on the initial equivalent model to obtain a target equivalent model of the wire harness temperature and the first current signal.
9. The method according to claim 8, wherein, in a case where the wire harness is set as a preset wire harness, C/k=j is set, the calculating a temperature threshold value at which the vehicle wire harness passes the preset fixed current for a preset time based on the first temperature includes:
calculating the passing preset time T of the vehicle wire harness based on the first temperature N Is set to the preset fixed current I OC The temperature threshold at that time is as follows:
the initial equivalent model of the wire harness temperature and the first current signal is shown in the following formula:
wherein DeltaT k For the temperature of the vehicle harness at the current moment, deltaT k-1 The temperature of the vehicle wire harness at the moment before the current moment;
the target equivalent model of the wire harness temperature and the first current signal is shown in the following formula:
wherein R/c=α/Δt;
based on the target equivalent model, performing form transformation on the temperature threshold value of the vehicle wire harness to obtain the following formula:
10. The method according to claim 9, wherein the method further comprises:
at DeltaT k Greater than or equal to DeltaT max Determining the control command as disconnecting the vehicle harness from the powered device;
wherein at DeltaT k Greater than or equal to DeltaT max The target equivalent model is expressed as follows:
the temperature threshold is expressed as follows:
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