New energy commercial vehicle multi-gun parallel charging test system and test method

Abstract

The invention discloses a new energy commercial vehicle multi-gun parallel charging test system and test method, and relates to the technical field of new energy fast charging, the system comprises a tool plate, an upper computer, and a high and low temperature test chamber capable of adjusting temperature and humidity; the high and low temperature test cabin is used for accommodating a charging gun head and a charging socket, a high-voltage junction box, a battery system and a vehicle controller of a vehicle; the tool plate is arranged between the vehicle controller and the charging socket and is used for simulating a communication signal and a switching signal between the vehicle controller and the charging socket; the upper computer is used for controlling work of the tool plate and monitoring work of the vehicle controller, the battery system and the charging pile. The upper computer is connected with a vehicle controller through a CAN communication line, so that the vehicle controller is monitored, and then the working states of the battery system and the high-voltage junction box are monitored. The charging test under various working conditions can be realized, the test cost is reduced and the test reliability is ensured while the test efficiency is improved.

Description

Technical Field

[0001] The present application relates to the field of new energy fast charging technology, and specifically to a multi-gun charging test system and test method for new energy commercial vehicles. Background Art

[0002] With the rapid development of new energy vehicles, the market share of electric vehicles has increased year by year, and range anxiety is a common problem among new energy vehicles. Pure electric commercial vehicles have larger battery capacities than passenger cars and require greater charging power. They typically use off-board charging stations, or DC charging stations, to charge the entire vehicle. Therefore, developing a highly reliable charging system that effectively protects the vehicle's battery against various complex charging failures is crucial. Furthermore, pure electric commercial vehicles have larger battery capacities than passenger cars and require greater charging power. To address this, charging solutions typically include: standard two-, three-, four-, or even more-charger charging stations, supporting simultaneous charging of the battery system with standard two-, three-, or four-charger charging stations, or even more; single-charger liquid-cooled charging stations, supporting high-power single-charger charging; and dual-charger liquid-cooled charging stations, supporting even higher-power charging.

[0003] Under such high-power charging conditions, how to make the power battery system always operate within the optimal temperature range under various working conditions, ensure the safety of the power battery assembly, extend the life of the battery system, while continuously reducing the power consumption of the liquid-cooled battery and extending the driving range of electric vehicles has always been an issue that vehicle manufacturers need to continuously optimize.

[0004] Existing vehicle controllers typically only perform signal-level joint debugging tests on the entire vehicle's charging function in a laboratory. This makes it difficult to conduct joint debugging tests with physical charging stations, conduct charging reliability tests under various temperature and humidity conditions, and perform functional testing involving various charging process fault injections. Furthermore, conducting similar charging system reliability tests on entire vehicles is costly and time-consuming. Simulating some extreme operating conditions is difficult, and functional testing involving simulated controller fault injection is impossible. Summary of the Invention

[0005] The present application provides a multi-gun charging test system and test method for new energy commercial vehicles, which can realize charging tests under various working conditions, while improving test efficiency, reducing test costs and ensuring test reliability.

[0006] In a first aspect, an embodiment of the present application provides a multi-gun and charging test system for new energy commercial vehicles, the multi-gun and charging test system for new energy commercial vehicles comprising: A high and low temperature test chamber with adjustable temperature and humidity, which is used to accommodate the charging gun head as well as the vehicle's charging socket, high-voltage junction box, battery system, and vehicle controller; A tooling board, which is arranged between the vehicle controller and the charging socket, and is used to simulate the communication signals and switch signals between the vehicle controller and the charging socket; The host computer is used to control the operation of the tooling board and monitor the operation of the vehicle controller, battery system, and charging pile.

[0007] In combination with the first aspect, in one embodiment, the host computer is connected to the vehicle controller via a CAN communication line to monitor the vehicle controller, thereby monitoring the working status of the battery system and the high-voltage junction box; The host computer remotely controls the tooling board to achieve regulation and control of the analog signal value, the 24V power supply low voltage value, and the switch signal value.

[0008] In conjunction with the first aspect, in one embodiment, The tooling board is provided with three analog voltage signals, which are used to simulate the charging pile liquid level signal, the charging pile ambient temperature and the charging pile gun head temperature signal respectively; The simulated voltage signal is specifically used to simulate whether the charging pile periodically sends a charger suspension message to the vehicle and controls the charger to stop charging when water or foreign objects accidentally enter the charging pile, the ambient temperature changes suddenly, or the temperature of the charging head is too high during the charging process, and whether the internal switch of the charger is disconnected within the specified time.

[0009] In conjunction with the first aspect, in one embodiment, There are 8 relays on the tooling board, one of which is a parallel switch, and the remaining 7 are switch signals connected in series between the vehicle controller and the charging socket, namely PE, S+, S-, CC1, CC2, A+, and A-.

[0010] In conjunction with the first aspect, in one embodiment, The parallel switch is used to simulate whether the response of the charging pile, vehicle controller, and battery system meets the preset requirements when the button on the charging gun fails or is triggered by mistake during charging; The switch signal is used to simulate whether the response of the charging pile, vehicle controller, and battery system meets the preset requirements when the vehicle is disconnected from the charging pile, the charger control device has a communication failure, the charging pile end connection confirmation signal fails, the vehicle end connection confirmation signal fails, or the charging pile low-voltage power supply fails during the charging process.

[0011] In conjunction with the first aspect, in one embodiment, The tooling board is provided with a 24V low-voltage power supply voltage adjustable channel; The 24V low-voltage power supply voltage adjustable channel is used to connect the 24V low-voltage positive power supply line and the 24V low-voltage negative power supply line of the vehicle controller, or the 24V low-voltage power supply voltage adjustable channel is used to connect the low-voltage auxiliary power supply circuit of the charging pile; Adjust the voltage of the adjustable channel by adjusting the 24V low-voltage power supply voltage through the host computer to test whether the overvoltage or undervoltage protection function of each charging-related controller is normal during the charging process; The 24V low-voltage power supply voltage adjustable channel is also used to superimpose an AC voltage of set frequency and amplitude to simulate DC power supply ripple voltage, slow rise and fall of the 24V low-voltage power supply voltage, and instantaneous drop of the 24V low-voltage power supply voltage, thereby simulating the power supply failure of the entire vehicle and the reliability of various charging-related controllers.

[0012] In conjunction with the first aspect, in one embodiment, The host computer is also used to control the battery charging and discharging system to realize the load of the battery system to adjust the SOC of the battery system to a specified value, and test the charging performance of the battery system by the charging gun at different rates. At the same time, the host computer controls the additional temperature control equipment connected to the battery system to simulate the natural characteristic output of the vehicle temperature control system to ensure that the temperature of the charged battery system is within an appropriate range.

[0013] In conjunction with the first aspect, in one embodiment, The high and low temperature test chambers are adjusted to the target temperature and humidity points in sequence. After each adjustment, the charging gun charges the battery system. The additional temperature control equipment connected to the battery system simulates the natural characteristics of the vehicle temperature control system output to verify whether the pump selection of the vehicle temperature control system is appropriate during the charging process. Then, the high and low temperature test chambers are adjusted to the next target temperature and humidity point. The operation is repeated to verify whether the vehicle temperature control system meets the vehicle usage requirements under different temperature and humidity environments and different starting SOCs of the battery system.

[0014] In combination with the first aspect, in one embodiment, the temperature control system of the entire vehicle is placed in a high and low temperature test chamber, and an additional temperature control device for connecting to the battery system is provided outside the high and low temperature test chamber to provide a constant cooling or heating power to the temperature control system of the entire vehicle, thereby simulating the additional cooling power demand of the entire vehicle's temperature control system in addition to cooling the battery system when the cab cooling air conditioning is used during charging in the summer, or the additional heating power demand of the entire vehicle's temperature control system in addition to heating the battery system in the initial charging state during charging in the winter.

[0015] In a second aspect, an embodiment of the present application provides a multi-gun parallel charging test method for a new energy commercial vehicle. Based on the above-mentioned system implementation, the multi-gun parallel charging test method for a new energy commercial vehicle includes: Establish connections between components in the new energy commercial vehicle multi-gun and charging test system; Based on the simulation of communication signals and switch signals between the vehicle controller and the charging socket, charging tests under multi-gun charging conditions and functional tests during fault injection during the charging process are realized.

[0016] The beneficial effects of the technical solutions provided in the embodiments of the present application include: By setting up high and low temperature test chambers, tooling boards, and host computers, we can simulate multi-gun charging tests under various temperature and humidity conditions, and simultaneously conduct functional tests of various charging process fault injections. This allows us to implement charging tests under various working conditions, improving test efficiency while reducing test costs and ensuring test reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of multiple charging guns at the charging gun end; Figure 2 This is a schematic diagram of multiple guns and charging on the vehicle side; Figure 3 This is a structural diagram of the multi-gun and charging test system for new energy commercial vehicles in this application; Figure 4 A schematic diagram of the circuit connections between the charger, vehicle interface, and the entire vehicle; Figure 5 This is a flowchart of the multi-gun charging test method for new energy commercial vehicles applied for; Figure 6 This is a schematic diagram of the hardware structure of the multi-gun charging test equipment for new energy commercial vehicles in this application. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0019] First of all, it should be noted that for electric commercial vehicles with multiple charging guns and supplementary charging solutions, there are currently two solutions generally provided from the charging gun end or the vehicle end.

[0020] See also Figure 1As shown, for multi-charger parallel charging, the charging pile uses a master-slave collaborative controller to dynamically allocate power. This "on-demand" power allocation is achieved through control logic and hardware circuitry. Multi-charger communication occurs via the CAN bus. The master charger communicates with the vehicle's BMS (Battery Management System), identifying and allocating power between master and slave chargers based on vehicle requirements. The master charger allocates power based on vehicle requirements and then transmits instructions to the power distribution units of the slave chargers. These two power distribution units coordinate to ensure charging efficiency. The master charger provides overall charging information, while the slave chargers display their own individual charging information. Multi-charger parallel charging relies on hardware module grouping, dynamic contactor control, and software collaborative algorithms to dynamically allocate power based on grid load and charging demand, improving charging efficiency and equipment utilization, and achieving efficient use of power resources. Furthermore, multi-charger parallel charging does not limit the number of slave chargers in a charging pile. The number of chargers can be configured on demand, allowing higher power demands to be met by increasing the number of chargers.

[0021] Combine Figure 1 To explain, after guns A, B, C, and D are plugged in, B, C, and D select multiple guns and slaves and are selected as slave guns. Gun A selects multiple guns and slaves and is selected as the master gun. Gun A starts, and the vehicle-side BMS confirms the communication and returns the charging requirement. Gun A receives the charging requirement and allocates power to each slave gun. After that, the software and hardware dynamically coordinate to allocate power. Gun A starts successfully, and gun A controls all slave guns B, C, and D to start. At the same time, multiple guns are charged on a vehicle, and if any gun stops, all guns stop.

[0022] See also Figure 2 As shown, for multi-gun parallel charging on the vehicle side, the vehicle is equipped with multiple symmetrically distributed DC fast charging ports. Each interface contains a complete low-voltage communication module, high-voltage positive and negative circuits and grounding system, and supports single or dual guns to be connected at the same time. The charging interface can work independently or collaboratively, and the connection status of the charging gun can be judged in real time by the voltage value of the detection point to ensure the reliability of multi-gun access. Then, the vehicle-side BMS dynamically allocates the input power of each gun according to the battery status. Using CAN bus communication, each gun synchronizes data in real time and automatically triggers power merging calculation. The high-voltage charging lines of multiple DC charging ports are merged into one through the vehicle-side guidance circuit, that is, "current merging". The multi-gun parallel charging test system and test method for new energy commercial vehicles in this application are explained by taking the multi-gun parallel charging scheme on the vehicle side as an example.

[0023] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0024] In a first aspect, an embodiment of the present application provides a multi-gun charging test system for new energy commercial vehicles.

[0025] In one embodiment, referring to Figure 3 , Figure 3This is a schematic diagram of the structure of the multi-gun and charging test system for new energy commercial vehicles in this application. Figure 3 As shown in the figure, the multi-gun and charging test system for new energy commercial vehicles includes: a tooling board, a host computer, and a high and low temperature test chamber with adjustable temperature and humidity.

[0026] The high- and low-temperature test chamber houses the charging gun, as well as the vehicle's charging socket, high-voltage junction box, battery system, and vehicle controller. By placing the entire charging gun, charging socket, high-voltage junction box, battery system, and vehicle controller (i.e., the entire vehicle controller) within the chamber and adjusting the temperature and humidity within the chamber, we can simulate the charging environment of the entire vehicle under different temperature and humidity conditions.

[0027] The tooling board is located between the vehicle controller and the charging socket to simulate communication and switching signals between the two. The host computer controls the tooling board and monitors the operation of the vehicle controller, battery system, and charging station.

[0028] The host computer is connected to the vehicle controller via a CAN communication line and is connected to the tooling board via CAN communication or other communication means. The host computer monitors the vehicle controller via the CAN communication line, and further monitors the working status of the battery system and the high-voltage junction box. The host computer remotely controls the tooling board to adjust and control the analog signal value, the 24V power supply low voltage value, and the switch signal value. The control interface of the host computer is equipped with corresponding adjustment buttons.

[0029] Furthermore, the tooling board is provided with three analog voltage signals, which are used to simulate the charging pile liquid level signal, the charging pile ambient temperature and the charging pile gun head temperature signal respectively. The voltage values (0~5V) of these three analog voltage signals are adjustable, and the control interface of the host computer is equipped with corresponding adjustment buttons.

[0030] The analog voltage signal is specifically used to simulate whether the charging pile sends a charger suspension message to the vehicle periodically and controls the charger to stop charging when water or foreign objects enter the charging pile accidentally, the ambient temperature changes suddenly, or the charging head temperature is too high during the charging process, and whether the internal switch of the charger is disconnected within the specified time, specifically disconnecting switches K1, K2, K3 and K4. Figure 4 The figure shows the circuit connection diagram between the charger, vehicle interface and vehicle. Figure 4 It can be seen that the charging model mainly consists of three parts: the charger, the vehicle interface, and the entire vehicle, so abnormal charging termination is basically caused by these three parts.

[0031] Furthermore, the tooling board is equipped with 8 relays, one of which is a parallel switch, and the remaining 7 relays are switch signals connected in series between the vehicle controller and the charging socket, namely PE, S+, S-, CC1, CC2, A+, and A-. Among them, PE represents the vehicle body ground, S+ represents the charging communication CAN-H, S- represents the charging communication CAN-L, CC1 and CC2 represent charging connection confirmation, A+ represents the positive terminal of the low-voltage auxiliary power supply, and A- represents the negative terminal of the low-voltage auxiliary power supply.

[0032] The switch signal is used to simulate the charging process, when the vehicle and charging pile are disconnected from the ground (PE), the charger control device has a communication failure (S+, S-), the charging pile end connection confirmation signal fails (CC1), the vehicle end connection confirmation signal fails (CC2), and the charging pile low-voltage power supply fails (A+, A-). Whether the response of the charging pile, vehicle controller, and battery system meets the preset requirements, that is, whether the charging current can be reduced to below the safe current within the specified time.

[0033] A 24V low-voltage power supply voltage adjustable channel is provided on the tooling board. The 24V low-voltage power supply voltage adjustable channel is used to connect the 24V low-voltage positive power supply line and the 24V low-voltage negative power supply line of the vehicle controller. The voltage of the 24V low-voltage power supply voltage adjustable channel is adjusted by the host computer to test whether the overvoltage or undervoltage protection function of each charging-related controller is normal during the charging process; the 24V low-voltage power supply voltage adjustable channel is also used to superimpose an AC voltage of set frequency and amplitude to simulate DC power supply ripple voltage, slow rise and fall of 24V low-voltage power supply voltage, and instantaneous drop of 24V low-voltage power supply voltage, thereby simulating the power supply failure of the entire vehicle and the reliability of each charging-related controller.

[0034] That is, add a 24V low-voltage power supply voltage adjustable channel on the tooling board. The low-voltage power supply voltage of the commercial vehicle vehicle controller is 24V. Connect the 24V low-voltage positive power supply line and 24V low-voltage negative power supply line of the vehicle controller to the 24V low-voltage power supply voltage adjustable channel of the tooling board. The voltage of the 24V low-voltage power supply voltage adjustable channel is adjusted by the host computer to be too high (for example, more than 32V) or too low (for example, less than 16V). During the charging process, the overvoltage / undervoltage protection function of each charging-related controller is tested; the 24V low-voltage power supply voltage adjustable channel can also be superimposed with an AC voltage of a certain frequency and amplitude to simulate DC power supply ripple voltage, slow rise and fall of the 24V low-voltage power supply voltage, and instantaneous drop of the 24V low-voltage power supply voltage, thereby simulating the power supply failure of the entire vehicle and the reliability of each charging-related controller.

[0035] Furthermore, the low-voltage auxiliary power supply circuit of the charging pile can also be connected to the 24V low-voltage power supply voltage adjustable channel. The voltage of the 24V low-voltage power supply voltage adjustable channel can be adjusted by the host computer to be too high (for example, exceeding 32V) or too low (for example, less than 16V). During the charging process, the overvoltage / undervoltage protection function of each charging-related controller can be tested; the 24V low-voltage power supply voltage adjustable channel can also be superimposed with an AC voltage of a certain frequency and amplitude to simulate DC power supply ripple voltage, slow rise and fall of the 24V low-voltage power supply voltage, and instantaneous drop of the 24V low-voltage power supply voltage, thereby simulating the power supply failure of the entire vehicle and the reliability of each charging-related controller.

[0036] Furthermore, the host computer is also used to control the battery charging and discharging system to realize the load of the battery system to adjust the SOC of the battery system to a specified value, and test the charging performance of the battery system under different rates. At the same time, the host computer controls the additional temperature control equipment connected to the battery system to simulate the natural characteristic output of the vehicle temperature control system (i.e., flow, temperature, cooling / heating power are adjustable) to ensure that the temperature of the charged battery system is within the appropriate range. It should be noted that during multi-gun fast charging, the heat generated is greater than the previous single-gun charging, and the requirements for the vehicle's temperature control system are more stringent. The charging gun head, charging socket, high-voltage junction box, and battery system are placed in a high and low temperature test chamber. The high and low temperature test chamber provides the target temperature / humidity environment required for the experiment, charges and discharges the battery system under test, and adjusts the battery system to the target SOC (State-of-Charge); the temperature control equipment outside the high and low temperature test chamber provides the coolant required by the battery system under test to keep the battery system within the specified temperature range.

[0037] In this application, the high and low temperature test chambers are adjusted to the target temperature and humidity points in sequence, and after each adjustment, the charging gun charges the battery system. The additional temperature control equipment used to connect the battery system simulates the natural characteristic output of the vehicle temperature control system to verify whether the pump selection of the vehicle temperature control system is appropriate during the charging process. Then, the high and low temperature test chambers are adjusted to the next target temperature and humidity point, and the operation is repeated to verify whether the vehicle temperature control system meets the vehicle usage requirements under different temperature and humidity environments and different starting SOCs of the battery system.

[0038] That is, when charging the battery system through multiple charging guns, the temperature control equipment directly simulates the natural output characteristics of the vehicle's temperature control system (cooling / heating power is adjustable) to verify whether the vehicle's temperature control system pump selection is appropriate during the charging process; after the test is completed, the temperature and humidity of the high and low temperature test chamber are moved to the next test point, and the above test process is repeated. This back-and-forth process can verify whether the vehicle's temperature control system meets the vehicle's usage requirements under different temperature and humidity environments and different battery system starting SOCs.

[0039] In this application, the vehicle temperature control system is placed in a high and low temperature test chamber, and an additional temperature control device for connecting to the battery system is installed outside the high and low temperature test chamber to provide a constant cooling or heating power to the vehicle temperature control system, thereby simulating the additional cab cooling power demand of the vehicle temperature control system in addition to cooling the battery system when the cab cooling air conditioning is used during charging in the summer, or the additional cab heating power demand of the vehicle temperature control system in addition to heating the battery system in the initial charging state during charging in the winter.

[0040] That is, the vehicle temperature control system can also be placed in the high and low temperature test chamber, and the temperature control equipment outside the high and low temperature test chamber provides a constant cooling or heating power to the vehicle temperature control system, simulating the additional cab cooling power demand of the vehicle temperature control system in addition to cooling the battery system when charging in the summer and using the cab cooling and air conditioning. Or, when charging in the winter, the additional cab heating power demand of the vehicle temperature control system in addition to heating the battery system in the initial charging state.

[0041] The multi-gun and charging test system for new energy commercial vehicles in the embodiment of the present application simulates multi-gun charging tests under various temperature and humidity conditions through the settings of high and low temperature test chambers, tooling boards, and host computers, and simultaneously performs functional tests of various charging process fault injections. It can realize charging tests under various working conditions, while improving test efficiency, reducing test costs and ensuring test reliability.

[0042] On the second aspect, the embodiments of the present application also provide a multi-gun charging test method for new energy commercial vehicles.

[0043] In one embodiment, referring to Figure 5 , Figure 5 This is a flow chart of the multi-gun and charging test method for new energy commercial vehicles. Figure 5 As shown, the multi-charger and parallel charging test method for new energy commercial vehicles includes: S1: Establish connections between components in the new energy commercial vehicle multi-gun and charging test system; S2: Based on the simulation of communication signals and switch signals between the vehicle controller and the charging socket, charging tests under multi-gun charging conditions and functional tests during fault injection during the charging process are realized.

[0044] In a third aspect, an embodiment of the present application provides a multi-gun and charging test device for new energy commercial vehicles. The multi-gun and charging test device for new energy commercial vehicles can be a personal computer (PC), a laptop computer, a server, or other device with data processing capabilities.

[0045] Reference Figure 6 , Figure 6The hardware structure diagram of the multi-gun parallel charging test equipment for new energy commercial vehicles involved in the embodiment of the present application is shown in FIG. In the embodiment of the present application, the multi-gun parallel charging test equipment for new energy commercial vehicles may include a processor, a memory, a communication interface, and a communication bus.

[0046] The communication bus may be of any type and is used to interconnect the processor, memory, and communication interface.

[0047] Communication interfaces include input / output (I / O), physical, and logical interfaces, which interconnect components within the multi-gun parallel charging test equipment for new energy commercial vehicles, as well as other devices (such as other computing devices or user devices). Physical interfaces can include Ethernet, fiber optic, and ATM interfaces; user devices can include displays and keyboards.

[0048] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0049] The processor can be a general-purpose processor that can call a new energy commercial vehicle multi-gun parallel charging test program stored in a memory and execute the new energy commercial vehicle multi-gun parallel charging test method provided in the embodiments of this application. For example, the general-purpose processor can be a central processing unit (CPU). The methods executed when the new energy commercial vehicle multi-gun parallel charging test program is called can be referred to the various embodiments of the new energy commercial vehicle multi-gun parallel charging test method of this application and will not be repeated here.

[0050] Those skilled in the art will understand that Figure 6 The hardware structure shown in the figure does not constitute a limitation to the present application and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0051] In a fourth aspect, an embodiment of the present application also provides a computer-readable storage medium.

[0052] The computer-readable storage medium of the present application stores a new energy commercial vehicle multi-gun and charging test program, wherein when the new energy commercial vehicle multi-gun and charging test program is executed by the processor, the steps of the new energy commercial vehicle multi-gun and charging test method as described above are implemented.

[0053] Among them, the method implemented when the new energy commercial vehicle multi-gun and charging test program is executed can refer to the various embodiments of the new energy commercial vehicle multi-gun and charging test method of this application, and will not be repeated here.

[0054] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit the "first", "second" and "third" to different types.

[0055] In the description of the embodiments of this application, the words "exemplary," "for example," or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary," "for example," or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "for example," or "for example" is intended to present the relevant concepts in a concrete manner.

[0056] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0057] In some processes described in the embodiments of the present application, multiple operations or steps are included that appear in a specific order. However, it should be understood that these operations or steps may not be performed in the order in which they appear in the embodiments of the present application or may be performed in parallel. The sequence numbers of the operations are only used to distinguish between different operations, and the sequence numbers themselves do not represent any order of execution. In addition, these processes may include more or fewer operations, and these operations or steps may be performed in sequence or in parallel, and these operations or steps may be combined.

[0058] Through the description of the above embodiments, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of this application, or the part that contributes to the existing technology, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above and includes a number of instructions for enabling a terminal device to execute the methods described in each embodiment of this application.

[0059] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A multi-gun charging test system for new energy commercial vehicles, characterized by: The multi-gun and charging test system for new energy commercial vehicles includes: A high and low temperature test chamber with adjustable temperature and humidity, which is used to accommodate the charging gun head as well as the vehicle's charging socket, high-voltage junction box, battery system, and vehicle controller; A tooling board, which is arranged between the vehicle controller and the charging socket, and is used to simulate the communication signals and switch signals between the vehicle controller and the charging socket; The host computer is used to control the operation of the tooling board and monitor the operation of the vehicle controller, battery system, and charging pile.

2. A multi-gun charging test system for new energy commercial vehicles according to claim 1, characterized in that: The host computer is connected to the vehicle controller via a CAN communication line to monitor the vehicle controller, and further monitor the working status of the battery system and the high-voltage junction box; The host computer remotely controls the tooling board to achieve regulation and control of the analog signal value, the 24V power supply low voltage value, and the switch signal value.

3. A multi-gun charging test system for new energy commercial vehicles as claimed in claim 2, characterized in that: The tooling board is provided with three analog voltage signals, which are used to simulate the charging pile liquid level signal, the charging pile ambient temperature and the charging pile gun head temperature signal respectively; The simulated voltage signal is specifically used to simulate whether the charging pile periodically sends a charger suspension message to the vehicle and controls the charger to stop charging when water or foreign objects accidentally enter the charging pile, the ambient temperature changes suddenly, or the temperature of the charging head is too high during the charging process, and whether the internal switch of the charger is disconnected within the specified time.

4. A multi-gun charging test system for new energy commercial vehicles as claimed in claim 2, characterized in that: There are 8 relays on the tooling board, one of which is a parallel switch, and the remaining 7 are switch signals connected in series between the vehicle controller and the charging socket, namely PE, S+, S-, CC1, CC2, A+, and A-.

5. A multi-gun charging test system for new energy commercial vehicles as claimed in claim 4, characterized in that: The parallel switch is used to simulate whether the response of the charging pile, vehicle controller, and battery system meets the preset requirements when the button on the charging gun fails or is triggered by mistake during charging; The switch signal is used to simulate whether the response of the charging pile, vehicle controller, and battery system meets the preset requirements when the vehicle is disconnected from the charging pile, the charger control device has a communication failure, the charging pile end connection confirmation signal fails, the vehicle end connection confirmation signal fails, or the charging pile low-voltage power supply fails during the charging process.

6. A multi-gun charging test system for new energy commercial vehicles as claimed in claim 2, characterized in that: The tooling board is provided with a 24V low-voltage power supply voltage adjustable channel; The 24V low-voltage power supply voltage adjustable channel is used to connect the 24V low-voltage positive power supply line and the 24V low-voltage negative power supply line of the vehicle controller, or the 24V low-voltage power supply voltage adjustable channel is used to connect the low-voltage auxiliary power supply circuit of the charging pile; Adjust the voltage of the adjustable channel by adjusting the 24V low-voltage power supply voltage through the host computer to test whether the overvoltage or undervoltage protection function of each charging-related controller is normal during the charging process; The 24V low-voltage power supply voltage adjustable channel is also used to superimpose an AC voltage of set frequency and amplitude to simulate DC power supply ripple voltage, slow rise and fall of the 24V low-voltage power supply voltage, and instantaneous drop of the 24V low-voltage power supply voltage, thereby simulating the power supply failure of the entire vehicle and the reliability of various charging-related controllers.

7. The multi-gun charging test system for new energy commercial vehicles according to claim 1, characterized in that: The host computer is also used to control the battery charging and discharging system to realize the load of the battery system to adjust the SOC of the battery system to a specified value, and test the charging performance of the battery system by the charging gun at different rates. At the same time, the host computer controls the additional temperature control equipment connected to the battery system to simulate the natural characteristic output of the vehicle temperature control system to ensure that the temperature of the charged battery system is within an appropriate range.

8. The multi-gun charging test system for new energy commercial vehicles according to claim 1, characterized in that: The high and low temperature test chambers are adjusted to the target temperature and humidity points in sequence. After each adjustment, the charging gun charges the battery system. The additional temperature control equipment connected to the battery system simulates the natural characteristics of the vehicle temperature control system output to verify whether the pump selection of the vehicle temperature control system is appropriate during the charging process. Then, the high and low temperature test chambers are adjusted to the next target temperature and humidity point. The operation is repeated to verify whether the vehicle temperature control system meets the vehicle usage requirements under different temperature and humidity environments and different starting SOCs of the battery system.

9. The multi-gun charging test system for new energy commercial vehicles according to claim 1, characterized in that: The vehicle's temperature control system is placed in a high- and low-temperature test chamber. An additional temperature control device connected to the battery system is installed outside the chamber to provide a constant cooling or heating power to the vehicle's temperature control system. This simulates the additional cab cooling power requirements of the vehicle's temperature control system in addition to cooling the battery system when the cab air conditioning is in use during summer charging. Alternatively, the additional cab heating power requirements of the vehicle's temperature control system in addition to heating the battery system when charging in the initial charging state during winter.

10. A multi-gun charging test method for new energy commercial vehicles, implemented based on the system according to any one of claims 1 to 9, characterized in that: The multi-gun charging test method for new energy commercial vehicles includes: Establish connections between components in the new energy commercial vehicle multi-gun and charging test system; Based on the simulation of communication signals and switch signals between the vehicle controller and the charging socket, charging tests under multi-gun charging conditions and functional tests during fault injection during the charging process are realized.

Images