Automobile wire harness and current distribution system and method based on FPC

Abstract

The invention provides an FPC-based automobile wire harness and current distribution system, and the system comprises a power supply module which is used for transmitting the electric power of an automobile storage battery to each electric device of an automobile through a bus loop laid along the position of each electric device, and the bus is an FPC; the current distribution module is used for endowing each electric device with a weighting coefficient through an integrated circuit on the FPC, and the weighting coefficient is adjusted according to the working condition and the working time system of each electric device. And the integrated circuit controls the rated working current and the peak working current of the corresponding electric equipment to act on the common bus loop of the corresponding electric equipment in a peak shifting manner by adjusting the weighting coefficient of each electric equipment. According to the invention, a power supply bus form is adopted, and all common-path power transmission loops in power transmission paths from a power supply to electric equipment are integrated into a multi-stage bus, so that the number and the length of power supply loops in a traditional power distribution architecture are greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of automobile wiring, and in particular to an automobile wiring harness and current distribution system and method based on FPC. Background Art

[0002] Regarding the wiring scheme of automobiles, whether it is the traditional power distribution architecture with the traditional distribution box architecture as the hub or the intelligent power distribution architecture with the domain controller as the core, 3-5 distribution hubs are used for centralized power distribution.

[0003] This architecture is characterized by a large number of transmission circuits and a high path overlap rate. The starting point of the matching protection device for each transmission circuit is the fuse in the distribution box or the domain controller drive output interface, and the circuit sharing rate is low. Summary of the invention

[0004] The purpose of the present invention is to provide an FPC-based automotive wiring harness and current distribution system and method to address the defects of the prior art.

[0005] The present invention provides an FPC-based automotive wiring harness and current distribution system, comprising:

[0006] The power supply module is used to transmit the power of the vehicle battery to each electrical device of the vehicle through a busbar loop laid along the location of each electrical device, and the busbar is a copper-clad FPC;

[0007] The current distribution module is used to assign a weighted coefficient to each electrical device through the integrated circuit on the FPC. The weighted coefficient is adjusted according to the working condition and working time of each electrical device. The integrated circuit controls the rated working current and peak working current of the corresponding electrical equipment by adjusting the weighted coefficient of each electrical equipment to act on the common bus circuit of the electrical equipment.

[0008] Furthermore, in the power supply module, the busbar circuit has a multi-level structure, the first-level busbar circuit is laid along the length direction of the vehicle body, and both ends of the first-level busbar circuit are connected to the battery, the second-level busbar circuit is laid along the width direction of the vehicle body, and both ends of the second-level busbar circuit are connected to somewhere on the first-level busbar circuit, the third-level busbar circuit is laid along the length direction of the vehicle body, and both ends of the third-level busbar circuit are connected to somewhere on the second-level busbar circuit, the laying directions of the busbar circuits at each level are staggered horizontally and vertically and so on, and somewhere on the last-level busbar circuit is connected to the power supply terminal of the electrical equipment.

[0009] Furthermore, it also includes: a circuit protection module, which is used to perform circuit protection through a circuit protection device installed on the FPC at the connection point of each level of busbar, and set the rated parameters of the circuit protection device according to the rated working current and peak working current of each electrical equipment. The type of the rated parameter is determined according to the type of the circuit protection device.

[0010] Furthermore, the circuit protection device is a fuse etched on the FPC or an Efuse arranged on the FPC.

[0011] Furthermore, in the current distribution module, a weighted coefficient is assigned to each electrical device through an integrated circuit on the FPC, and the weighted coefficient is adjusted according to the working condition and working time of each electrical device. The specific method of the integrated circuit controlling the rated working current and peak working current of the corresponding electrical device to act on the common bus circuit of the electrical device by adjusting the weighted coefficient of each electrical device is as follows:

[0012] First, calculate the rated working current of the busbar. The calculation formula is as follows:

[0013]

[0014] in, is the rated operating current of the nth m-level busbar, I m,n,i is the rated working current of the electrical equipment i directly or indirectly powered by the nth m-level busbar, μ m,n,i The usage weighting coefficient of the electric device i directly or indirectly powered by the nth m-level bus, wherein the value of the usage weighting coefficient is set between 0 and 1 according to the working condition and working time system of the electric load;

[0015] Then, calculate the bus peak operating current, the calculation formula is as follows:

[0016]

[0017] in, is the peak operating current of the nth m-level bus after statistics based on the vehicle operating conditions, I m,n,ip is the working current of the power load directly or indirectly supplied by the nth m-level busbar under the corresponding working conditions;

[0018] Finally, the weighting coefficient of each electrical equipment is adjusted in real time according to the working conditions and working hours of the power load, and the rated working current and peak working current of each electrical equipment are controlled to act on the common bus circuit of each electrical equipment in a staggered manner.

[0019] Furthermore, the calculation method of the cross-sectional area of ​​the FPC copper cladding is as follows:

[0020] According to the calculation formula of current carrying capacity, the cross-sectional area of ​​FPC copper is calculated as follows:

[0021] I m,n =K i T m,n 0.44 A m,n 0.725

[0022] Among them, I m,n is the maximum current carrying capacity of the nth m-level busbar, K i is the derating parameter of the electrical equipment i, T m,n A is the maximum allowable temperature rise of the nth m-level busbar, m,n is the cross-sectional area of ​​the FPC copper clad of the nth m-level busbar, and the maximum current carrying capacity I m,n According to the rated operating current of the nth m-level bus set up.

[0023] An FPC-based automotive wiring harness and current distribution method, comprising:

[0024] The power of the vehicle battery is transmitted to each electrical device of the vehicle through a busbar loop laid along the location of each electrical device, and the busbar is a copper-clad FPC;

[0025] Through the integrated circuit on the FPC, a weighting coefficient is assigned to each electrical equipment, and the weighting coefficient is adjusted according to the working condition and working time of each electrical equipment. The integrated circuit controls the rated working current and peak working current of the corresponding electrical equipment by adjusting the weighting coefficient of each electrical equipment, and acts on the common bus circuit of the electrical equipment in a staggered manner.

[0026] Furthermore, the busbar circuit has a multi-level structure, wherein the primary busbar circuit is laid along the length direction of the vehicle body, and both ends of the primary busbar circuit are connected to the battery; the secondary busbar circuit is laid along the width direction of the vehicle body, and both ends of the secondary busbar circuit are connected to somewhere of the primary busbar circuit; the tertiary busbar circuit is laid along the length direction of the vehicle body, and both ends of the tertiary busbar circuit are connected to somewhere of the secondary busbar circuit; the laying directions of the busbar circuits of each level are staggered horizontally and vertically and so on, and somewhere of the last busbar circuit is connected to the power supply terminal of the electrical equipment.

[0027] Furthermore, it also includes: performing circuit protection through a circuit protection device installed on the FPC at the connection of each level of busbar, and setting the rated parameters of the circuit protection device according to the rated working current and peak working current of each electrical equipment, and the type of the rated parameters is determined according to the type of the circuit protection device.

[0028] A computer program product, including a computer program / instruction, which, when executed by a processor, implements the steps of assigning a weighting coefficient to each electrical device in the above-mentioned FPC-based automotive wiring harness and current distribution method, and controlling the rated working current and peak working current of the corresponding electrical device to act on the common bus circuit of the corresponding electrical device by adjusting the weighting coefficient of each electrical device.

[0029] The beneficial effects of the present invention are:

[0030] 1. In the traditional power distribution architecture, all electrical equipment basically needs to draw power from a limited number of distribution hubs on the vehicle. This technical solution adopts a power supply busbar form to integrate all common transmission circuits in the transmission path from the power source to the electrical equipment into a multi-level busbar, thereby greatly reducing the number and length of power supply circuits in the traditional power distribution architecture.

[0031] 2. The multi-level power supply bus realizes the integration of power supply circuits on the common path, so that each power load can realize the working current and peak current staggered on the common power supply bus circuit (i.e., weighted coefficient setting) based on different working conditions and different working hours, without having to be dealt with by a single power supply harness alone. Compared with the traditional power distribution method (the power supply line of each power-consuming equipment needs to independently deal with the rated / peak / abnormal working current of the load of this circuit, and a certain design redundancy must also be considered), this solution uses the public power supply bus to deal with the "overrated" current of different loads occurring in different working conditions and at different times, so that the circuit utilization rate is improved, thereby reducing the cost and weight of the harness.

[0032] 3. Etching fuses on FPC or setting integrated circuit Efuse on each level of power supply busbars can provide circuit protection for each level of power supply busbars while distributing fuses in different parts of the harness, thereby avoiding centralized fuse setting and eliminating the power distribution box; thereby reducing a series of risks and costs such as the development cost, space occupied, and electric heating risk of the power distribution box; at the same time, based on etched fuses and integrated circuit Efuse, a fusing characteristic that is closer to the protection requirements of different circuits can be achieved, and it is not necessary to select only rated specifications of fuses as in the traditional power distribution architecture, thereby saving the design redundancy of matching the circuit conductor with the fuse specification, and further reducing the conductor cross-sectional area and weight cost.

[0033] 4. The present invention uses FPC as a wiring harness carrier, providing a technical basis for the above-mentioned power distribution architecture, and at the same time achieving the "structural" goal of the wiring harness, so that the automotive wiring harness can exist in the form of a structured cable that occupies a smaller space, and the wiring harness direction and layout space are regularized, which has the technical basis for realizing automated assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a logic block diagram of the present invention. DETAILED DESCRIPTION

[0035] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0036] Example 1

[0037] refer to Figure 1 , an FPC-based automotive wiring harness and current distribution system, comprising:

[0038] The power supply module is used to transmit the power of the vehicle battery to each electrical device of the vehicle through the busbar loop laid along the position of each electrical device, and the busbar is a copper-clad FPC. Among them, the busbar loop is a multi-level structure, the primary busbar loop is laid along the length direction of the vehicle body, and the two ends of the primary busbar loop are connected to the battery, the secondary busbar loop is laid along the width direction of the vehicle body, and the two ends of the secondary busbar loop are connected to a certain point of the primary busbar loop, the tertiary busbar loop is laid along the length direction of the vehicle body, and the two ends of the tertiary busbar loop are connected to a certain point of the secondary busbar loop, the laying direction of each level of busbar loop is staggered horizontally and vertically, and so on, and a certain point of the last level of busbar loop is connected to the power supply end of the electrical device.

[0039] The current distribution module is used to assign a weighted coefficient to each electrical device through the integrated circuit on the FPC. The weighted coefficient is adjusted according to the working condition and working time of each electrical device. The integrated circuit controls the rated working current and peak working current of the corresponding electrical devices by adjusting the weighted coefficient of each electrical device to act on the common bus circuit of the electrical devices in a staggered manner.

[0040] The circuit protection module is used to perform circuit protection through the circuit protection device installed on the FPC at the connection of each level of busbar, and set the rated parameters of the circuit protection device according to the rated working current and peak working current of each electrical equipment. The type of the rated parameter is determined according to the type of circuit protection device.

[0041] (1) FPC (flexible printed circuit) is a conductor circuit pattern made by transferring and etching a pattern using light imaging on a flexible substrate surface. The circuit pattern surface is protected and insulated by PI and glue layer. By embedding the circuit design on a bendable thin plastic sheet, a large number of precision components can be stacked in a narrow and limited space to form a bendable flexible circuit. It has advantages that other types of circuit boards cannot match, such as high wiring density, light weight, thin thickness, foldable and bendable, and three-dimensional wiring. It is more in line with the development trend of intelligent and portable electronic products in downstream industries and is widely used in modern electronic products.

[0042] This technical solution adopts a decentralized power distribution architecture. The power distribution and circuit protection are not centrally set up. According to the layout of the electrical equipment and the current load, a multi-level current bus type power supply circuit is laid. At the same time, the characteristics of FPC that can integrate electronic components and its own processable etched fuses are used to achieve circuit protection and power distribution for each level of current bus. There is no centralized power distribution hub in the whole vehicle. The power distribution and circuit protection devices are distributed at the connection parts of the power bus at each level; at the same time, the power supply lines to each electrical equipment of the vehicle are no longer independent paths of "power distribution box / domain controller-electrical equipment", but through the path of "primary power supply bus-secondary power supply bus-third power supply bus-..." to achieve step-by-step sharing from upstream to downstream circuits. Through this form of power distribution, the number and length of power supply circuits can be greatly reduced, and the power supply circuits can be shared to the greatest extent. At the same time, the necessary margin in the use of wires due to the matching of wires and fuses is reduced, which makes a great contribution to reducing the cost, weight and space of the wiring harness.

[0043] (2) In the current distribution module, a weighting coefficient is assigned to each electrical device through the integrated circuit on the FPC. The weighting coefficient is adjusted according to the working condition and working time of each electrical device. The specific method of the integrated circuit controlling the rated working current and peak working current of the corresponding electrical device by adjusting the weighting coefficient of each electrical device to act on the common bus circuit of the electrical devices is as follows:

[0044] First, calculate the rated working current of the busbar. The calculation formula is as follows:

[0045]

[0046] in, is the rated operating current of the nth m-level busbar, I m,n,i is the rated working current of the electrical equipment i directly or indirectly powered by the nth m-level busbar, μ m,n,i The usage weighting coefficient of the electric device i directly or indirectly powered by the nth m-level bus, wherein the value of the usage weighting coefficient is set between 0 and 1 according to the working condition and working time system of the electric load;

[0047] Then, calculate the bus peak operating current, the calculation formula is as follows:

[0048]

[0049] in, is the peak operating current of the nth m-level bus after statistics based on the vehicle operating conditions, I m,n,ip is the working current of the power load directly or indirectly supplied by the nth m-level busbar under the corresponding working conditions;

[0050] Finally, the weighting coefficient of each electrical equipment is adjusted in real time according to the working conditions and working hours of the power load, and the rated working current and peak working current of each electrical equipment are controlled to act on the common bus circuit of each electrical equipment in a staggered manner.

[0051] (3) The calculation method of the cross-sectional area of ​​the FPC copper cladding is as follows:

[0052] According to the calculation formula of current carrying capacity, the cross-sectional area of ​​FPC copper is calculated as follows:

[0053] I m,n =K i T m,n 0.44 A m,n 0.725

[0054] Among them, I m,n is the maximum current carrying capacity of the nth m-level busbar, K i is the derating parameter of the electrical equipment i, T m,n A is the maximum allowable temperature rise of the nth m-level busbar, m,n is the cross-sectional area of ​​the FPC copper clad of the nth m-level busbar, and the maximum current carrying capacity I m,n According to the rated operating current of the nth m-level bus set up.

[0055] (4) The circuit protection device is a fuse etched on the FPC or an Efuse (programmable electronic fuse) set on the FPC. A circuit protection device is set at the transition point between the upper busbar and the lower busbar to achieve segmented circuit protection for busbars with different load currents and different cross-sections;

[0056] FPC etched fuses etch specific circuit paths on the surface of FPC according to requirements, so that their heating and fusing characteristics meet the needs of circuit protection, that is, the fuses are integrated on the FPC substrate through etching technology. These fuses play the role of overcurrent protection in the circuit. When the current exceeds the set value, the fuse will quickly melt, thereby cutting off the circuit to prevent equipment damage or safety accidents. At the same time, since the fuse itself is part of the FPC substrate, its position can be flexibly set as needed to achieve distributed circuit protection between multi-level power supply buses;

[0057] Similarly, based on the characteristics of SMD and solderability, FPC can naturally flexibly integrate electronic components and diversify the functions of transmission media. If etching fuses are not used, intelligent control components such as Efuse can also be flexibly integrated through circuit design to achieve circuit protection and power distribution.

[0058] Regardless of whether it is an etched fuse or an integrated circuit electronic fuse, the fuse's fusing characteristics can be set according to the rated current and peak current on each level of the power supply bus.

[0059] The distributed power distribution architecture and hierarchical power transmission busbars in this solution can also be implemented in the form of non-FPC carriers, such as traditional wires or flexible flat cables. However, other forms of circuit protection devices (traditional fuses or eFUSEs) need to be installed at the connection points of different levels of busbars, but this increases the number of wiring harness components and loses the flexibility of setting fuses anywhere as needed. Ultimately, compared with this technical solution, it is at a disadvantage in terms of space occupied, connection scheme, and process feasibility, and its feasibility is reduced.

[0060] Example 2

[0061] An FPC-based automotive wiring harness and current distribution method, comprising:

[0062] The busbar loop laid along the position of each electrical device transmits the power of the car battery to each electrical device of the car. The busbar is a copper-clad FPC. The busbar loop is a multi-level structure. The primary busbar loop is laid along the length of the car body. Both ends of the primary busbar loop are connected to the battery. The secondary busbar loop is laid along the width of the car body. Both ends of the secondary busbar loop are connected to a certain point of the primary busbar loop. The tertiary busbar loop is laid along the length of the car body. Both ends of the tertiary busbar loop are connected to a certain point of the secondary busbar loop. The laying directions of the busbar loops at each level are staggered horizontally and vertically, and so on. A certain point of the last busbar loop is connected to the power supply end of the electrical device.

[0063] Through the integrated circuit on the FPC, a weighting coefficient is assigned to each electrical equipment, and the weighting coefficient is adjusted according to the working condition and working time of each electrical equipment. The integrated circuit controls the rated working current and peak working current of the corresponding electrical equipment by adjusting the weighting coefficient of each electrical equipment, and acts on the common bus circuit of the electrical equipment in a staggered manner.

[0064] Circuit protection is performed by means of a circuit protection device installed on the FPC at the connection of each level of busbars, and the rated parameters of the circuit protection device are set according to the rated working current and peak working current of each electrical equipment. The type of the rated parameters is determined according to the type of the circuit protection device.

[0065] (1) FPC (flexible printed circuit) is a conductor circuit pattern made by transferring and etching a pattern using light imaging on a flexible substrate surface. The circuit pattern surface is protected and insulated by PI and glue layer. By embedding the circuit design on a bendable thin plastic sheet, a large number of precision components can be stacked in a narrow and limited space to form a bendable flexible circuit. It has advantages that other types of circuit boards cannot match, such as high wiring density, light weight, thin thickness, foldable and bendable, and three-dimensional wiring. It is more in line with the development trend of intelligent and portable electronic products in downstream industries and is widely used in modern electronic products.

[0066] This technical solution adopts a decentralized power distribution architecture. The power distribution and circuit protection are not centrally set up. According to the layout of the electrical equipment and the current load, a multi-level current bus type power supply circuit is laid. At the same time, the characteristics of FPC that can integrate electronic components and its own processable etched fuses are used to achieve circuit protection and power distribution for each level of current bus. There is no centralized power distribution hub in the whole vehicle. The power distribution and circuit protection devices are distributed at the connection parts of the power bus at each level; at the same time, the power supply lines to each electrical equipment of the vehicle are no longer independent paths of "power distribution box / domain controller-electrical equipment", but through the path of "primary power supply bus-secondary power supply bus-third power supply bus-..." to achieve step-by-step sharing from upstream to downstream circuits. Through this form of power distribution, the number and length of power supply circuits can be greatly reduced, and the power supply circuits can be shared to the greatest extent. At the same time, the necessary margin in the use of wires due to the matching of wires and fuses is reduced, which makes a great contribution to reducing the cost, weight and space of the wiring harness.

[0067] (2) The integrated circuit on the FPC assigns a weighting coefficient to each electrical device, and the weighting coefficient is adjusted according to the working condition and working time of each electrical device. The integrated circuit controls the rated working current and peak working current of the corresponding electrical device by adjusting the weighting coefficient of each electrical device to act on the common bus circuit of the electrical devices in a staggered manner as follows:

[0068] First, calculate the rated working current of the busbar. The calculation formula is as follows:

[0069]

[0070] in, is the rated operating current of the nth m-level busbar, I m,n,i is the rated working current of the electrical equipment i directly or indirectly powered by the nth m-level busbar, μ m,n,i The usage weighting coefficient of the electric device i directly or indirectly powered by the nth m-level bus, wherein the value of the usage weighting coefficient is set between 0 and 1 according to the working condition and working time system of the electric load;

[0071] Then, calculate the bus peak operating current, the calculation formula is as follows:

[0072]

[0073] in, is the peak operating current of the nth m-level bus after statistics based on the vehicle operating conditions, I m,n,ip is the working current of the power load directly or indirectly supplied by the nth m-level busbar under the corresponding working conditions;

[0074] Finally, the weighting coefficient of each electrical equipment is adjusted in real time according to the working conditions and working hours of the power load, and the rated working current and peak working current of each electrical equipment are controlled to act on the common bus circuit of each electrical equipment in a staggered manner.

[0075] (3) The calculation method of the cross-sectional area of ​​the FPC copper cladding is as follows:

[0076] According to the calculation formula of current carrying capacity, the cross-sectional area of ​​FPC copper is calculated as follows:

[0077] I m,n =K i T m,n 0.44 A m,n 0.725

[0078] Among them, I m,n is the maximum current carrying capacity of the nth m-level busbar, K i is the derating parameter of the electrical equipment i, T m,n A is the maximum allowable temperature rise of the nth m-level busbar, m,n is the cross-sectional area of ​​the FPC copper clad of the nth m-level busbar, and the maximum current carrying capacity I m,n According to the rated operating current of the nth m-level bus set up.

[0079] (4) The circuit protection device is a fuse etched on the FPC or an Efuse (programmable electronic fuse) set on the FPC. A circuit protection device is set at the transition point between the upper busbar and the lower busbar to achieve segmented circuit protection for busbars with different load currents and different cross-sections;

[0080] FPC etched fuses etch specific circuit paths on the surface of FPC according to requirements, so that their heating and fusing characteristics meet the needs of circuit protection, that is, the fuses are integrated on the FPC substrate through etching technology. These fuses play the role of overcurrent protection in the circuit. When the current exceeds the set value, the fuse will quickly melt, thereby cutting off the circuit to prevent equipment damage or safety accidents. At the same time, since the fuse itself is part of the FPC substrate, its position can be flexibly set as needed to achieve distributed circuit protection between multi-level power supply buses;

[0081] Similarly, based on the characteristics of SMD and solderability, FPC can naturally flexibly integrate electronic components and diversify the functions of transmission media. If etching fuses are not used, intelligent control components such as Efuse can also be flexibly integrated through circuit design to achieve circuit protection and power distribution.

[0082] Regardless of whether it is an etched fuse or an integrated circuit electronic fuse, the fuse's fusing characteristics can be set according to the rated current and peak current on each level of the power supply bus.

[0083] The distributed power distribution architecture and hierarchical power transmission busbars in this solution can also be implemented in the form of non-FPC carriers, such as traditional wires or flexible flat cables. However, other forms of circuit protection devices (traditional fuses or eFUSEs) need to be installed at the connection points of different levels of busbars, but this increases the number of wiring harness components and loses the flexibility of setting fuses anywhere as needed. Ultimately, compared with this technical solution, it is at a disadvantage in terms of space occupied, connection scheme, and process feasibility, and its feasibility is reduced.

[0084] Example 3

[0085] A computer program product, comprising a computer program / instruction, characterized in that when the computer program / instruction is executed by a processor, the steps of assigning a weighting coefficient to each electrical device in the FPC-based automotive wiring harness and current distribution method in Example 2 are implemented, and by adjusting the weighting coefficient of each electrical device, the rated working current and peak working current of the corresponding electrical device are controlled to act on the common bus circuit of the corresponding electrical device in a staggered manner.

[0086] The contents not described in detail in this specification belong to the prior art known to those skilled in the art. It should be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0087] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0088] These computer program instructions may also be stored in a computer readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0089] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit its protection scope. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the field should understand that after reading the present invention, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the invention, but these changes, modifications or equivalent substitutions are all within the protection scope of the pending claims of the invention.

Claims

1. An FPC-based automotive wiring harness and current distribution system, characterized in that: include: A power supply module is used to transmit the power of the vehicle battery to each electrical device of the vehicle through a busbar loop laid along the location of each electrical device, and the busbar is an FPC; The current distribution module is used to assign a weighted coefficient to each electrical device through the integrated circuit on the FPC. The weighted coefficient is adjusted according to the working condition and working time of each electrical device. The integrated circuit controls the rated working current and peak working current of the application electrical equipment by adjusting the weighted coefficient of each electrical device to act on the common bus circuit of the corresponding application electrical equipment.

2. The FPC-based automotive wiring harness and current distribution system according to claim 1, characterized in that: In the power supply module, the busbar circuit has a multi-level structure. The primary busbar circuit is laid along the length direction of the vehicle body, and both ends of the primary busbar circuit are connected to the battery. The secondary busbar circuit is laid along the width direction of the vehicle body, and both ends of the secondary busbar circuit are connected to somewhere on the primary busbar circuit. The tertiary busbar circuit is laid along the length direction of the vehicle body, and both ends of the tertiary busbar circuit are connected to somewhere on the secondary busbar circuit. The laying directions of the busbar circuits at each level are staggered horizontally and vertically, and so on. Somewhere on the last busbar circuit is connected to the power supply end of the electrical equipment.

3. The FPC-based automotive wiring harness and current distribution system according to claim 2, characterized in that: Also includes: The circuit protection module is used to perform circuit protection through the circuit protection device installed on the FPC at the connection of each level of busbar, and set the rated parameters of the circuit protection device according to the rated working current and peak working current of each electrical equipment. The type of the rated parameter is determined according to the type of circuit protection device.

4. The FPC-based automotive wiring harness and current distribution system according to claim 3, characterized in that: The circuit protection device is a fuse etched on the FPC or an Efuse arranged on the FPC.

5. The FPC-based automotive wiring harness and current distribution system according to claim 1, characterized in that: In the current distribution module, each electrical device is assigned a weighted coefficient through the integrated circuit on the FPC, and the weighted coefficient is adjusted according to the working conditions and working hours of each electrical device. The specific method of the integrated circuit controlling the peak-shifting effect of the rated working current and the peak working current of the applied electrical device on the common bus circuit of the corresponding applied electrical devices by adjusting the weighted coefficient of each electrical device is as follows: First, calculate the rated working current of the busbar. The calculation formula is as follows: in, is the rated operating current of the nth m-level busbar, I m,n,i is the rated working current of the electrical equipment i directly or indirectly powered by the nth m-level busbar, μ m,n,i The usage weighting coefficient of the electric device i directly or indirectly powered by the nth m-level bus, wherein the value of the usage weighting coefficient is set between 0 and 1 according to the working condition and working time system of the electric load; Then, calculate the bus peak operating current, the calculation formula is as follows: in, is the peak operating current of the nth m-level bus after statistics based on the vehicle operating conditions, I m,n,ip is the working current of the power load directly or indirectly supplied by the nth m-level busbar under the corresponding working conditions; Finally, the weighted coefficient of each electrical equipment is adjusted in real time according to the working conditions and working hours of the power load, and the rated working current and peak working current of the electrical equipment are controlled to act on the common bus circuit of the corresponding electrical equipment.

6. The FPC-based automotive wiring harness and current distribution system according to claim 5, characterized in that: The calculation method of the cross-sectional area of ​​the FPC copper cladding is as follows: According to the calculation formula of current carrying capacity, the cross-sectional area of ​​FPC copper is calculated as follows: I m,n =K i T m,n 0.44 A m,n 0.725 Among them, I m,n is the maximum current carrying capacity of the nth m-level busbar, K i is the derating parameter of the electrical equipment i, T m,n A is the maximum allowable temperature rise of the nth m-level busbar, m,n is the cross-sectional area of ​​the FPC copper clad of the nth m-level busbar, and the maximum current carrying capacity I m,n According to the rated operating current of the nth m-level bus set up.

7. An FPC-based automotive wiring harness and current distribution method, characterized in that: include: The power of the vehicle battery is transmitted to each electrical device of the vehicle through a busbar loop laid along the location of each electrical device, and the busbar is a copper-clad FPC; Through the integrated circuit on the FPC, a weighting coefficient is assigned to each electrical device, and the weighting coefficient is adjusted according to the working condition and working time of each electrical device. The integrated circuit controls the rated working current and peak working current of the application electrical equipment by adjusting the weighting coefficient of each electrical device to act on the common bus circuit of the corresponding application electrical equipment.

8. The FPC-based automotive wiring harness and current distribution method according to claim 7, characterized in that: The busbar loop has a multi-level structure. The primary busbar loop is laid along the length direction of the vehicle body, and both ends of the primary busbar loop are connected to the battery. The secondary busbar loop is laid along the width direction of the vehicle body, and both ends of the secondary busbar loop are connected to somewhere on the primary busbar loop. The tertiary busbar loop is laid along the length direction of the vehicle body, and both ends of the tertiary busbar loop are connected to somewhere on the secondary busbar loop. The laying directions of the busbar loops at each level are staggered horizontally and vertically, and so on. Somewhere on the last busbar loop is connected to the power supply terminal of the electrical equipment.

9. The FPC-based automotive wiring harness and current distribution method according to claim 8, characterized in that: Also includes: Circuit protection is performed by means of a circuit protection device installed on the FPC at the connection of each level of busbars, and the rated parameters of the circuit protection device are set according to the rated working current and peak working current of each electrical equipment. The type of the rated parameters is determined according to the type of the circuit protection device.

10. A computer program product comprising a computer program / instructions, characterized in that The computer program / instructions, when executed by the processor, implement the steps of assigning a weighting coefficient to each electrical device in claim 7, and controlling the rated operating current and peak operating current of the corresponding electrical device to act in a staggered manner on the common bus circuit of the corresponding electrical device by adjusting the weighting coefficient of each electrical device.

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