Test system and device for vehicle-mounted refrigerator

Abstract

The utility model provides a test system and device for a vehicle-mounted refrigerator, and relates to the technical field of testing, and the test system comprises a power module, a communication module, a control module and a switch module. The power module is connected with the battery; the communication module is connected with the power supply module and the vehicle-mounted refrigerator; the control module is connected with the power module and the communication module; the switch module is connected with the power supply module and the control module, when the switch module works in a first conduction state, the control module controls the vehicle-mounted refrigerator to be switched to a refrigeration test mode through the communication module, and when the switch module works in a second conduction state, the control module controls the vehicle-mounted refrigerator to be switched to a heating test mode through the communication module. According to the test system, the test mode of the vehicle-mounted refrigerator can be correspondingly and automatically changed by changing the conduction state of the switch module, and the switching flexibility is high. And the professional demand is relatively low, the operation is simple, the cost is relatively low, and batch testing of the vehicle-mounted refrigerator is facilitated.

Description

Technical Field

[0001] This application relates to the field of testing technology, and more specifically, to a testing system and apparatus for a vehicle-mounted refrigerator. Background Technology

[0002] Currently, some vehicles are equipped with onboard refrigerators to improve the comfort of drivers and passengers. To ensure the reliability of onboard refrigerators, integrated testing is required, especially for those using Local Interconnect Network (LIN) interfaces.

[0003] In related technologies, a personal computer (PC) and the Vector test toolchain are typically used for integrated testing of vehicle-mounted refrigerators. The Vector test toolchain is complex, requires professional testers to set up the test environment, the testing process is complicated, and the Vector test toolchain is relatively expensive. Utility Model Content

[0004] To address the aforementioned issues, this application provides a testing system and apparatus for vehicle-mounted refrigerators, aiming to resolve the problems of complex testing processes and high costs associated with testing using the Vector testing toolchain in related technologies.

[0005] In a first aspect, this application provides a testing system for an in-vehicle refrigerator, including a power module, a communication module, a control module, and a switch module; the power module is connected to a battery; the communication module is connected to the power module and the in-vehicle refrigerator; the control module is connected to the power module and the communication module; the switch module is connected to the power module and the control module. When the switch module operates in a first conducting state, the control module controls the in-vehicle refrigerator to switch to a cooling test mode via the communication module. When the switch module operates in a second conducting state, the control module controls the in-vehicle refrigerator to switch to a heating test mode via the communication module.

[0006] In the above technical solution, when the switch module operates in the first conducting state, the control module controls the vehicle refrigerator to switch to the cooling test mode via the communication module, facilitating integrated testing of the vehicle refrigerator's cooling function. When the switch module operates in the second conducting state, the control module controls the vehicle refrigerator to switch to the heating test mode via the communication module, facilitating integrated testing of the vehicle refrigerator's heating function. Thus, by changing the conducting state of the switch module, the test system can automatically change the test mode of the vehicle refrigerator accordingly, offering high flexibility. Furthermore, there is no need for professional testers to set up a test environment or write test cases; even beginners can quickly master the operation method to quickly switch the conducting state of the switch module to change the test mode of the vehicle refrigerator. It has low professional requirements and is simple to operate. Moreover, the manufacturing cost of the hardware circuit formed by the switch module is approximately two hundred yuan, which is extremely low compared to the Vector testing tool in related technologies, significantly reducing costs and facilitating batch testing of vehicle refrigerators.

[0007] In conjunction with the first aspect, in some possible implementations, the switch module includes a first hardware switch and a second hardware switch; the first terminal of the first hardware switch is connected to the first terminal of the control module and the power module, and the second terminal of the first hardware switch is grounded; the first terminal of the second hardware switch is connected to the second terminal of the control module and the power module, and the second terminal of the second hardware switch is grounded; wherein, when the first hardware switch is triggered, the switch module operates in a first conducting state; when the second hardware switch is triggered, the switch module operates in a second conducting state.

[0008] In the above technical solution, triggering either the first or second hardware switch changes the conduction state of the switch module, thereby altering the test mode of the vehicle refrigerator. This means that the hardware switches allow for rapid switching of the vehicle refrigerator's test mode with high flexibility. Secondly, both the first and second hardware switches can directly control the circuit's on / off state or changes in the signal path. Compared to software control, hardware operation is generally more stable and reliable. Furthermore, hardware switches are unaffected by electromagnetic interference or software errors, resulting in higher operational stability and reliability.

[0009] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the switch module further includes a third hardware switch. The first end of the third hardware switch is connected to the third end of the control module and the power module, and the second end of the third hardware switch is grounded. When the third hardware switch is triggered, the switch module operates in the third conduction state, and the test system switches from the preparation mode to the test mode.

[0010] In the above technical solution, the operator can switch the vehicle refrigerator to test mode by triggering the third hardware switch, and then switch it to cooling test mode or heating test mode via the first or second hardware switch. This avoids the problem of accidental triggering of the vehicle refrigerator by accidentally activating the first or second hardware switch before it has entered test mode, thus ensuring the accuracy and reliability of triggering and switching the test mode of the vehicle refrigerator. Secondly, the third hardware switch allows for rapid triggering of the vehicle refrigerator's test mode without complex communication settings, and offers high flexibility.

[0011] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the power supply module includes a first filter unit, a second filter unit, and a step-down chip; the first end of the first filter unit is connected to the battery, and the second end of the first filter unit is grounded; the first end of the second filter unit is connected to the third end of the first filter unit, and the second end of the second filter unit is grounded; the first pin of the step-down chip is connected to the third end of the second filter unit, and the second pin of the step-down chip is connected to the communication module, the control module, and the switching module.

[0012] In the above technical solution, the battery voltage output by the battery is filtered by the first and second filtering units before being output to the step-down chip. The first and second filtering units can filter out noise in stages and more thoroughly to ensure that the voltage input to the step-down chip is purer and smoother. The step-down chip then reduces the filtered 12V battery voltage to 3.3V and outputs it to the communication module, control module, and switching module to ensure the reliability of the power supply module's power supply to the communication module, control module, and switching module based on the 12V battery.

[0013] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the first filter unit includes a first capacitor, a second capacitor, a first diode, and a third capacitor; the first plate of the first capacitor, the first plate of the second capacitor, and the positive terminal of the diode are connected to the battery, the negative terminal of the diode is connected to the first plate of the third capacitor and the first end of the second filter unit, and the second plates of the first capacitor, the second plate of the second capacitor, and the second plate of the third capacitor are grounded.

[0014] In the above technical solution, the battery voltage is filtered by the first capacitor and the second capacitor and then output to the first diode. The first diode can prevent current from flowing from the step-down chip to the battery, and avoid reverse current flow caused by the battery voltage being lower than the output voltage or other abnormal conditions, thereby protecting the battery and circuit from damage and improving the operational reliability of the battery and circuit.

[0015] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the second filter unit includes a fourth capacitor, a first inductor and a fifth capacitor; the first plate of the fourth capacitor and one end of the first inductor are connected to the negative terminal of the first diode, the other end of the first inductor is connected to the first plate of the fifth capacitor and the first pin of the step-down chip, and the second plate of the fourth capacitor and the second plate of the fifth capacitor are grounded.

[0016] In the above technical solution, the voltage output from the first filtering unit is filtered by the fourth capacitor and then output to the first inductor. The first inductor has energy storage characteristics; when the buck chip is working, it can store energy from the battery and release it when needed, thereby smoothing the output current and reducing voltage fluctuations. Secondly, the first inductor, together with the fourth and fifth capacitors, can form a filter to further filter out high-frequency noise and ripple, ensuring that the voltage output to the buck chip is more stable and pure.

[0017] In combination with the first aspect and the above implementation methods, in some possible implementation methods, the communication module includes a communication chip, a second inductor, and a protection unit; the first pin, the second pin, and the third pin of the communication chip are respectively connected to the control module; one end of the second inductor is connected to the fourth pin of the communication chip; one end of the protection unit is connected to the other end of the second inductor and the vehicle refrigerator, and the other end of the protection unit is grounded.

[0018] In the above technical solution, the second inductor is used for filtering and impedance matching. The second inductor helps stabilize the current and reduce electromagnetic interference, thereby improving the stability and reliability of the signal output from the communication chip to the vehicle refrigerator. The protection unit protects the communication module from electrostatic discharge damage. Thus, the communication chip can convert the commands issued by the control module into LIN protocol format and send them to the vehicle refrigerator to trigger or switch the vehicle refrigerator's test mode accordingly.

[0019] In combination with the first aspect and the above implementation, in some possible implementations, the communication module further includes a second diode and a first resistor; the positive terminal of the second diode is connected to the battery; one end of the first resistor is connected to the negative terminal of the second diode, and the other end of the first resistor is connected to the other end of the second inductor and one end of the protection unit.

[0020] In the above technical solution, the second diode is used to protect the circuit from reverse voltage, and the first resistor is used to limit the current and stabilize the circuit to improve the reliability of the LIN pin, thereby ensuring the reliability of the communication chip.

[0021] Combining the first aspect and the above implementation methods, in some possible implementation methods, the control module is a microcontroller, the first pin, the second pin and the third pin of the microcontroller are connected to the first pin, the second pin and the third pin of the communication chip respectively, and the fourth pin, the fifth pin and the sixth pin of the microcontroller are connected to the switch module respectively.

[0022] Secondly, embodiments of this application also provide a testing device, including a battery, a circuit board, a housing, and a display screen; the circuit board integrates the testing system described in any of the optional methods of the first aspect, and the testing system is connected to the battery; the housing is embedded on the circuit board; the display screen is electrically connected to the testing system and embedded on the housing. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the module structure of a testing system provided in an embodiment of this application;

[0024] Figure 2 This is a schematic diagram of the circuit structure of a test system provided in an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the display structure of a display screen provided in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of another display structure provided in an embodiment of this application;

[0027] Figure 5 This is a schematic diagram of the display structure of another display screen provided in an embodiment of this application;

[0028] Figure 6 This is a schematic diagram of the module structure of a power module provided in an embodiment of this application;

[0029] Figure 7 This is a schematic diagram of the circuit structure of a power module provided in an embodiment of this application;

[0030] Figure 8 This is a schematic diagram of the circuit structure of a step-down chip provided in an embodiment of this application;

[0031] Figure 9 This is a schematic diagram of the circuit structure of a communication module provided in an embodiment of this application;

[0032] Figure 10 This is a schematic diagram of the circuit structure of a control module provided in an embodiment of this application.

[0033] The following are the labeling elements in the figure:

[0034] 1. Test system; 11. Power supply module; 111. First filter unit; 112. Second filter unit; 12. Communication module; 121. Protection unit; 13. Control module; 14. Switch module; 2. Battery;

[0035] K2, First hardware switch; K3, Second hardware switch; K1, Third hardware switch; U1, Step-down chip; U2, Communication chip; U3, Microcontroller; C1, First capacitor; C2, Second capacitor; C3, Third capacitor; C4, Fourth capacitor; C5, Fifth capacitor; C6, Sixth capacitor; C7, Seventh capacitor; C8, Eighth capacitor; C9, Ninth capacitor; C10, Tenth capacitor; C11, Eleventh capacitor; C12, Twelfth capacitor; C13, Thirteenth capacitor; C14, Fourteenth capacitor; L1, First inductor; L2, Second inductor; D1, First diode; D2, Second diode; R1, First resistor; R2, Second resistor; R3, Third resistor; R4, Fourth resistor; R5, Fifth resistor; R6, Sixth resistor; R7, Seventh resistor; R8, Eighth resistor; R9, Ninth resistor; R10, Tenth resistor; R11, Eleventh resistor; VBAT, Battery voltage. Detailed Implementation

[0036] The technical solutions in this application will be clearly and thoroughly described below with reference to the accompanying drawings. In the description of the embodiments of this application, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in the text is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more than two.

[0037] Hereinafter, the terms "first" and "second" are used for descriptive purposes only and should not be construed as implying or suggesting relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

[0038] With the increasing integration of vehicle electronic equipment, some vehicles are now equipped with onboard refrigerators to improve driver and passenger comfort. These refrigerators connect to the vehicle's main control unit (MCU) via the vehicle's bus system to receive commands. To ensure the reliability of these onboard refrigerators, integrated testing is necessary (e.g., functional verification, communication protocol compatibility testing, and security testing). The demand for testing cooling and heating functions during development, vehicle integration, and after-sales service is becoming increasingly prominent.

[0039] In related technologies, a PC and the Vector test toolchain are typically used for integrated testing of vehicle refrigerators with LIN interfaces. The Vector test toolchain is complex, requiring specialized testing personnel to set up the test environment. The testing setup process is complicated, and the Vector test toolchain itself is expensive, with manufacturing costs exceeding 100,000 RMB when used with a PC. Furthermore, the PC requires a power supply, and the corresponding vehicle-mounted system also needs an inverter and a Universal Serial Bus (USB) to LIN converter, making the test equipment inconvenient to carry. Therefore, the related technologies using a PC and the Vector test toolchain for integrated testing of vehicle refrigerators are costly, require a high level of expertise, are complex to operate, and are inconvenient to carry.

[0040] Therefore, this application provides a testing system and apparatus for vehicle-mounted refrigerators. This testing system can automatically change the testing mode of the vehicle-mounted refrigerator by changing the conduction state of the switching module, offering high flexibility in switching. Furthermore, it has low professional requirements, is simple to operate, and has low cost, making it suitable for batch testing of vehicle-mounted refrigerators.

[0041] The following description, in conjunction with the accompanying drawings, provides an exemplary description of the vehicle-mounted refrigerator testing system and apparatus provided in the embodiments of this application.

[0042] This application provides a testing device, including a battery, a circuit board, a housing, and a display screen. The circuit board integrates a testing system, the battery is connected to the testing system and the display screen, the housing is embedded on the circuit board, and the display screen is electrically connected to the testing system and embedded on the housing.

[0043] The battery powers the testing system and display screen. Optionally, a 12V portable battery can be used, which provides reliable power to the testing equipment without requiring an inverter or PC on the vehicle, thus simplifying the testing setup. Furthermore, the 12V portable battery occupies less space, making it more suitable for vehicle-based testing environments and offering greater convenience.

[0044] The testing system connects to the vehicle-mounted refrigerator. Specifically, when testing the refrigerator, the testing system connects to the refrigerator's LIN interface via a LIN cable. The testing system can flexibly switch the refrigerator's mode to test mode via the LIN cable for subsequent integrated testing. Furthermore, after switching the refrigerator to test mode, the display screen shows corresponding test status prompts for operator monitoring.

[0045] To enable the testing system to flexibly switch the vehicle refrigerator mode to the testing mode, in one example, such as... Figure 1As shown, the test system 1 includes a power module 11, a communication module 12, a control module 13, and a switch module 14. The power module 11 is connected to the battery 2, the communication module 12 is connected to the power module 11 and the vehicle refrigerator 3, the control module 13 is connected to the power module 11 and the communication module 12, and the switch module 14 is connected to the power module 11 and the control module 13.

[0046] In this example, when the switch module 14 operates in different conduction states, the control module 13 will switch the vehicle refrigerator 3 to the corresponding test mode. For example, when the switch module 14 operates in the first conduction state, the control module 13 is connected to the switch module 14, and the control module 13 will receive a status signal indicating that the switch module 14 is operating in the first conduction state. At this time, the control module 13 will control the vehicle refrigerator 3 to switch to the cooling test mode via the communication module 12 to facilitate integrated testing of the cooling function of the vehicle refrigerator 3. When the switch module 14 operates in the second conduction state, the control module 13 will receive a status signal indicating that the switch module 14 is operating in the second conduction state. At this time, the control module 13 will control the vehicle refrigerator 3 to switch to the heating test mode via the communication module 12 to facilitate integrated testing of the heating function of the vehicle refrigerator 3.

[0047] Thus, by changing the conduction state of switch module 14, test system 1 can automatically change the test mode of vehicle refrigerator 3, offering high flexibility. Furthermore, there is no need for professional testers to set up a test environment or write test cases; even beginners can quickly master the operation method to rapidly switch the conduction state of switch module 14 to change the test mode of vehicle refrigerator 3. It has low professional requirements and is simple to operate. Moreover, the hardware circuit formed by switch module 14 costs approximately 200 yuan to manufacture, which is extremely low compared to Vector testing tools in related technologies, significantly reducing costs and facilitating batch testing of vehicle refrigerator 3.

[0048] In order to ensure that the different conduction states of the switch module 14 correspond to the different test modes of the vehicle refrigerator 3, in one example, such as Figure 2 As shown, the switch module 14 includes a first hardware switch K2 and a second hardware switch K3. The first terminal of the first hardware switch K2 is connected to the first terminal of the control module 13 and the power module 11, and the second terminal of the first hardware switch K2 is grounded. The first terminal of the second hardware switch K3 is connected to the second terminal of the control module 13 and the power module 11, and the second terminal of the second hardware switch K3 is grounded. It is worth noting that VDD_3V3 in the diagram represents the 3.3V supply voltage output by the power module 11.

[0049] Initially, both the first hardware switch K2 and the second hardware switch K3 are in the off state. When it is necessary to switch the vehicle refrigerator 3 to the cooling test mode, the first hardware switch K2 is triggered. When the first hardware switch K2 is triggered, it is in the conducting state. At this time, the second hardware switch K3 is not triggered and remains in the off state. After the first hardware switch K2 is triggered, the switch module 14 operates in the first conducting state, and the control module 13 switches the vehicle refrigerator 3 to the cooling test mode. When it is necessary to switch the vehicle refrigerator 3 to the heating test mode, the second hardware switch K3 is triggered. When the second hardware switch K3 is triggered, it is in the conducting state. At this time, the first hardware switch K2 is not triggered and remains in the off state. After the second hardware switch K3 is triggered, the switch module 14 operates in the second conducting state, and the control module 13 switches the vehicle refrigerator 3 to the heating test mode.

[0050] Thus, by triggering the first hardware switch K2 or the second hardware switch K3, the conduction state of the switch module 14 can be changed accordingly, thereby changing the test mode of the vehicle refrigerator 3. This means that the test mode of the vehicle refrigerator 3 can be quickly switched via hardware switches without complex communication settings, offering high flexibility. Secondly, the first hardware switch K2 and the second hardware switch K3 can directly control the on / off state of the circuit or changes in the signal path. Compared to software control, hardware operation is generally more stable and reliable. Furthermore, hardware switches are unaffected by electromagnetic interference (EMI) or software errors, resulting in higher operational stability and reliability.

[0051] Optionally, the first hardware switch K2 and the second hardware switch K3 can be selected as push-button switches, rotary switches, DIP switches, electromagnetic switches, or single-pole multi-throw switches, etc. When the first hardware switch K2 and the second hardware switch K3 are push-button switches, the operator can turn on the corresponding push-button switch by pressing it. When the first hardware switch K2 and the second hardware switch K3 are rotary switches, the operator can turn on the corresponding rotary switch by turning it to the corresponding position. When the first hardware switch K2 and the second hardware switch K3 are DIP switches, the operator can turn on the corresponding DIP switch by moving it to the corresponding position. The first hardware switch K2 and the second hardware switch K3 can also be selected as other switches that can achieve the above functions; this application does not impose specific restrictions on this.

[0052] In one example, such as Figure 2As shown, the switch module 14 also includes a sixth capacitor C6, a seventh capacitor C7, a second resistor R2, and a third resistor R3. The first plate of the sixth capacitor C6 is connected to the first terminal of the first hardware switch K2, the first terminal of the control module 13, and one end of the second resistor R2. The second plate of the sixth capacitor C6 is grounded, and the other end of the second resistor R2 is connected to the power module 11. The first plate of the seventh capacitor C7 is connected to the first terminal of the second hardware switch K3, the second terminal of the control module 13, and one end of the third resistor R3. The second plate of the seventh capacitor C7 is grounded, and the other end of the third resistor R3 is connected to the power module 11.

[0053] In this example, the sixth capacitor C6 smooths out the spike current or voltage glitches generated when the first hardware switch K2 switches, and the seventh capacitor C7 smooths out the spike current or voltage glitches generated when the second hardware switch K3 switches, thus eliminating transient interference caused by switching actions and protecting the control module 13 and other sensitive components. Secondly, the first hardware switch K2 and the second hardware switch K3 may generate mechanical jitter when switching states, leading to unstable output signals (such as multiple triggers). By setting resistors and capacitors between the first hardware switch K2 and the second hardware switch K3 and the control module 13, an RC low-pass filter can be formed to filter out these jitter signals, ensuring that the control module 13 receives a clean and stable signal, thereby guaranteeing the reliability of the control module 13's switching of the vehicle refrigerator 3 test mode based on the received signal.

[0054] To avoid accidental triggering, in one example, such as Figure 2 As shown, the switch module 14 also includes a third hardware switch K1. The first end of the third hardware switch K1 is connected to the third end of the control module 13 and the power module 11, and the second end of the third hardware switch K1 is grounded.

[0055] Initially, the first hardware switch K2, the second hardware switch K3, and the third hardware switch K1 are all in the off state. When testing the vehicle refrigerator 3, the operator needs to trigger the third hardware switch K1 first. When the third hardware switch K1 is triggered, it is in the on state. At this time, the first hardware switch K2 and the second hardware switch K3 are not triggered, so they remain in the off state. After the third hardware switch K1 is triggered, the switch module 14 operates in the third on state. That is, at this time, the control module 13 receives a status signal indicating that the switch module 14 is operating in the third on state. At this time, the control module 13 will control the vehicle refrigerator 3 to switch to the test mode via the communication module 12. The operator then presses the first hardware switch K2 or the second hardware switch K3 to switch the vehicle refrigerator 3 to the cooling test mode or the heating test mode.

[0056] In this example, the operator can switch the vehicle refrigerator 3 to test mode by triggering the third hardware switch K1, and then switch it to either cooling test mode or heating test mode via the first hardware switch K2 or the second hardware switch K3. This avoids the problem of accidental triggering of the vehicle refrigerator 3 by accidentally touching the first hardware switch K2 or the second hardware switch K3 before it has entered test mode, thus ensuring the accuracy and reliability of triggering and switching the test mode of the vehicle refrigerator 3. Secondly, the third hardware switch K1 allows for rapid triggering of the vehicle refrigerator 3's test mode without complex communication settings, and offers high flexibility.

[0057] Optionally, the third hardware switch K1 can be a push-button switch, rotary switch, DIP switch, electromagnetic switch, or single-pole multi-throw switch.

[0058] It is worth noting that when the test system 1 switches the vehicle refrigerator 3 to test mode, the display screen can also show the corresponding test status prompts for the operator to view. For example, assuming that the first hardware switch K2, the second hardware switch K3, and the third hardware switch K1 are push-button type hardware switches, such as... Figure 3 The image shows the initial prompts on the display screen. "K1: Test_Mode" refers to the third hardware switch K1, corresponding to the test mode of the vehicle refrigerator 3; "K2: Cool_Mode" refers to the first hardware switch K2, corresponding to the cooling test mode of the vehicle refrigerator 3; and "K3: Heat_Mode" refers to the second hardware switch K3, corresponding to the heating test mode of the vehicle refrigerator 3.

[0059] When the operator presses the third hardware switch K1, the display screen remains as shown. Figure 3 The initial prompt message is shown. When the operator presses the first hardware switch K2, for example, a short press, the first hardware switch K2 will activate upon release. After the short press, the test system 1 will send a power command to the vehicle refrigerator 3, followed by cooling commands at 200ms intervals. The display screen remains as shown. Figure 4 The displayed message, "Cooling...", indicates that the vehicle refrigerator 3 is currently in cooling test mode. The operator can determine from this message that the vehicle refrigerator 3 is in cooling test mode. When the operator presses the second hardware switch K3 (e.g., a short press), the switch becomes active upon release. After the short press, the test system 1 sends a power command to the vehicle refrigerator 3, followed by a heating command at 200ms intervals. The display remains as shown. Figure 5The prompt message shown indicates that the vehicle refrigerator 3 is currently in heating test mode. Operators can know from this test status prompt that the vehicle refrigerator 3 is in heating test mode.

[0060] In summary, the testing device provided in this application will automatically begin functional initialization after being powered on, and then wait for the test button command (i.e., the signal that the hardware switch is triggered). When the test button is pressed, the functional test will automatically begin, and the test status prompt information will be displayed on the screen for the operator to observe.

[0061] In one example, such as Figure 2 As shown, the switch module 14 also includes an eighth capacitor C8 and a fourth resistor R4. The first plate of the eighth capacitor C8 is connected to the first terminal of the third hardware switch K1, the third terminal of the control module 13, and one end of the fourth resistor R4. The second plate of the eighth capacitor C8 is grounded, and the other end of the fourth resistor R4 is connected to the power supply module 11.

[0062] In this example, the eighth capacitor C8 can smooth out the spike current or voltage glitches generated when the third hardware switch K1 switches, thereby eliminating transient interference caused by the switching action and protecting the control module 13 and other sensitive components. Secondly, the third hardware switch K1 may generate mechanical jitter when switching states, resulting in unstable output signals. By setting a resistor and a capacitor between the third hardware switch K1 and the control module 13, an RC low-pass filter can be formed to filter out these jitter signals, ensuring that the control module 13 receives a clean and stable signal, thereby ensuring the reliability of the triggering of the vehicle refrigerator 3 test mode based on the received signal by the control module 13.

[0063] To ensure that the power module 11 can reliably power the communication module 12, control module 13, and switching module 14 based on the 12V battery 2, in one example, such as Figure 6 As shown, the power module 11 includes a first filter unit 111, a second filter unit 112, and a step-down chip U1. The first terminal of the first filter unit 111 is connected to the battery 2, and the second terminal of the first filter unit 111 is grounded. The first terminal of the second filter unit 112 is connected to the third terminal of the first filter unit 111, and the second terminal of the second filter unit 112 is grounded. The first pin of the step-down chip U1 is connected to the third terminal of the second filter unit 112, and the second pin of the step-down chip U1 is connected to the communication module 12, the control module 13, and the switch module 14.

[0064] The battery voltage output by battery 2 may contain ripple and high-frequency noise, which may affect the normal operation of the buck converter U1. Therefore, the power module 11 of this application includes a first filter unit 111 and a second filter unit 112. The battery voltage output by battery 2 is input to the first filter unit 111, which can initially remove most of the low-frequency and high-frequency interference before outputting it to the second filter unit 112. The second filter unit 112 further optimizes the signal quality and reduces unnecessary energy loss. Thus, the battery voltage output by battery 2 is filtered by the first filter unit 111 and the second filter unit 112 before being output to the buck converter U1. The first filter unit 111 and the second filter unit 112 can filter out these noises in stages and more thoroughly, ensuring that the voltage input to the buck converter U1 is purer and smoother.

[0065] The step-down chip U1 reduces the filtered 12V battery voltage to 3.3V and outputs it to the communication module 12, control module 13, and switch module 14 to ensure the reliability of the power supply provided by the power module 11 to the communication module 12, control module 13, and switch module 14 based on the 12V battery 2.

[0066] In one example, such as Figure 7 As shown, the first filter unit 111 includes a first capacitor C1, a second capacitor C2, a first diode D1, and a third capacitor C3. The first plate of the first capacitor C1, the first plate of the second capacitor C2, and the positive terminal of the diode are connected to the battery 2. The negative terminal of the diode is connected to the first plate of the third capacitor C3 and the first terminal of the second filter unit 112. The second plates of the first capacitor C1, the second plate of the second capacitor C2, and the second plate of the third capacitor C3 are grounded.

[0067] In this example, the battery voltage VBAT is filtered by the first capacitor C1 and the second capacitor C2 and then output to the first diode D1. The first diode D1 can prevent current from flowing from the step-down chip U1 to the battery 2, avoiding reverse current flow caused by the battery voltage being lower than the output voltage or other abnormal conditions, thereby protecting the battery 2 and the circuit from damage and improving the operational reliability of the battery 2 and the circuit.

[0068] In one example, such as Figure 7 As shown, the second filter unit 112 includes a fourth capacitor C4, a first inductor L1, and a fifth capacitor C5. The first plate of the fourth capacitor C4 and one end of the first inductor L1 are connected to the negative terminal of the first diode D1, and the other end of the first inductor L1 is connected to the first plate of the fifth capacitor C5 and the first pin of the step-down chip U1. The second plates of the fourth capacitor C4 and the fifth capacitor C5 are grounded.

[0069] In this example, the voltage output from the first filter unit 111 is filtered by the fourth capacitor C4 and then output to the first inductor L1. The first inductor L1 has energy storage characteristics; when the buck chip U1 is working, it can store energy from the battery 2 and release it when needed, thereby smoothing the output current and reducing voltage fluctuations. Secondly, the first inductor L1, together with the fourth capacitor C4 and the fifth capacitor C5, can form an LC filter to further filter out high-frequency noise and ripple, ensuring a more stable and pure voltage output to the buck chip U1. When the second filter unit 112 is equipped with the first inductor L1, the first diode D1 can also provide a freewheeling path when the buck chip U1 is turned off or malfunctions, preventing damage to the buck chip U1 due to the back electromotive force of the first inductor L1.

[0070] Optionally, the step-down chip U1 can be selected as follows: Figure 8 The illustrated low dropout linear regulator (LDO) chip has five pins. The EN pin is connected to a 12V battery voltage via resistor R5, and the VIN pin is also connected to a 12V battery voltage and grounded via capacitor C9. The two GND pins are grounded. The OUT pin is connected to communication module 12, control module 13, and switch module 14. In this configuration, the OUT pin outputs 3.3V and is grounded via capacitor C10. The buck converter U1 can be any LDO chip capable of performing the above functions; this application does not impose specific limitations on this.

[0071] The communication module 12 is primarily responsible for transmitting control commands and status information between the control module 13 and the vehicle-mounted refrigerator 3. Since the vehicle-mounted refrigerator 3 uses a LIN interface, the communication module 12 converts the commands issued by the control module 13 into LIN protocol format and sends them to the vehicle-mounted refrigerator 3, and also receives status feedback from the refrigerator. In one example, such as... Figure 9 As shown, the communication module 12 includes a communication chip U2, a second inductor L2, and a protection unit 121. The first pin of the communication chip U2 (as shown) Figure 9 As shown in the RSD), the second pin (as shown in the diagram) Figure 9 As shown in SLIP_N) and the third pin (as shown in the image) Figure 9 The TXD pins shown are connected to the control module 13, and one end of the second inductor L2 is connected to the fourth pin of the communication chip U2 (as shown). Figure 9 As shown in the diagram, the protection unit 121 is connected to the other end of the second inductor L2 and the vehicle refrigerator 3, and the other end of the protection unit 121 is grounded.

[0072] The second inductor L2 is used for filtering and impedance matching. It helps stabilize the current and reduce electromagnetic interference, thereby improving the stability and reliability of the signal output from the communication chip U2 to the vehicle refrigerator 3. The protection unit 121 protects the communication module 12 from electrostatic discharge (ESD) damage.

[0073] Optionally, the protection unit 121 is an ESD device.

[0074] The communication chip U2 uses a LIN bus controller chip to handle the LIN communication protocol. Through the communication chip U2, commands issued by the control module 13 can be converted into LIN protocol format and sent to the vehicle refrigerator 3 to trigger or switch the test mode of the vehicle refrigerator 3 accordingly. For example, the communication chip U2 can be a TJA1021T chip operating as a LIN master node. The communication chip U2 is configured with... Figure 9 The pins shown are RXD (receive data), TXD (transmit data), VBAT (battery voltage), SLIP_N (slide enable), WAKE_N (wake up), and LIN (LIN signal line).

[0075] The RXD, SLIP_N, WAKE_N, and TXD pins are connected to resistors R6, R7, R8, R9, R10, and R11. Resistors R6, R7, R8, R9, R10, and R11 are used for current limiting, biasing, and signal conditioning. The WAKE_N pin is also grounded via capacitor C11. The battery voltage is filtered by capacitors C12 and C13 before being output to the VBAT pin of communication chip U2. The LIN pin is also grounded via capacitor C14.

[0076] In one example, such as Figure 7 As shown, the communication module 12 also includes a second diode D2 and a first resistor R1. The positive terminal of the second diode D2 is connected to the battery 2, one end of the first resistor R1 is connected to the negative terminal of the second diode D2, and the other end of the first resistor R1 is connected to the other end of the second inductor L2 and one end of the protection unit 121.

[0077] In this example, the second diode D2 is used to protect the circuit from reverse voltage, and the first resistor R1 is used to limit the current and stabilize the circuit to improve the reliability of the LIN pin, thereby ensuring the reliability of the communication chip U2.

[0078] To ensure the reliability of the communication module 12, multiple test points are also provided in the communication module 12. The test points are used to monitor the voltage or current of key nodes in the circuit of the communication module 12. For example, test points can be set between the RXD pin and the seventh resistor R7, between the eighth resistor R8 and the eleventh resistor R11, between the WAKE_N pin and the ninth resistor R9, etc. Test points can also be set at other points. The specific settings can be made according to actual needs. This application does not impose specific restrictions on this.

[0079] Optional, such as Figure 10 As shown, control module 13 is a microcontroller unit (MCU), and the first pin of microcontroller U3 (as shown) Figure 10 As shown in pin 43), the second pin (as shown in pin 43) Figure 10 As shown in pin 41) and the third pin (as shown in pin 41) and the third pin Figure 10 Pin 42 (as shown) is connected to the first, second, and third pins of the communication chip U2, respectively. The fourth pin of the microcontroller U3 (as shown)... Figure 10 As shown in pin 9), the fifth pin (as shown in pin 5) Figure 10 As shown in pin 10) and pin 6 (as shown in pin 6) Figure 10 Pin 11 (as shown) is connected to switch module 14, that is, pins 4, 5, and 6 of microcontroller U3 are connected to the first hardware switch K2, the second hardware switch K3, and the third hardware switch K1, respectively. Microcontroller U3 also includes other functional pins. Microcontroller U3 uses a conventional MCU, and its corresponding other functional pins can be referenced from conventional models; therefore, they will not be described further. Microcontroller U3 offers high control reliability and low cost.

[0080] In summary, when the switch module 14 operates in different conduction states, the control module 13 switches the vehicle refrigerator 3 to the corresponding test mode. By changing the conduction state of the switch module 14, the test system 1 can automatically change the test mode of the vehicle refrigerator 3, offering high flexibility. Furthermore, there is no need for professional testers to set up a test environment or write test cases; even beginners can quickly master the operation method to rapidly switch the conduction state of the switch module 14 to change the test mode of the vehicle refrigerator 3. It has low professional requirements and is simple to operate. Moreover, the hardware circuit formed by the switch module 14 costs approximately 200 yuan to manufacture, which is extremely low compared to the Vector testing tool in related technologies, significantly reducing costs and facilitating batch testing of the vehicle refrigerator 3.

[0081] Through the above description of the embodiments, those skilled in the art will understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0082] In the embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0083] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A testing system for a vehicle-mounted refrigerator, characterized in that, The testing system includes: A power module, which is connected to a battery; A communication module, which is connected to the power module and the vehicle refrigerator; A control module, which is connected to the power supply module and the communication module; and, A switch module is connected to the power module and the control module. When the switch module is in a first conducting state, the control module controls the vehicle refrigerator to switch to a cooling test mode via the communication module. When the switch module is in a second conducting state, the control module controls the vehicle refrigerator to switch to a heating test mode via the communication module.

2. The testing system according to claim 1, characterized in that, The switching module includes: A first hardware switch, wherein a first terminal of the first hardware switch is connected to a first terminal of the control module and the power module, and a second terminal of the first hardware switch is grounded; and... A second hardware switch, the first end of which is connected to the second end of the control module and the power module, and the second end of which is grounded; Specifically, when the first hardware switch is triggered, the switch module operates in the first conduction state; when the second hardware switch is triggered, the switch module operates in the second conduction state.

3. The testing system according to claim 2, characterized in that, The switching module also includes: A third hardware switch, the first end of which is connected to the third end of the control module and the power module, and the second end of which is grounded; When the third hardware switch is triggered, the switch module operates in the third conduction state, and the test system switches from the preparation mode to the test mode.

4. The testing system according to claim 1, characterized in that, The power module includes: A first filter unit, wherein a first end of the first filter unit is connected to the battery, and a second end of the first filter unit is grounded; A second filter unit, wherein a first terminal of the second filter unit is connected to a third terminal of the first filter unit, and a second terminal of the second filter unit is grounded; and, A step-down chip, wherein the first pin of the step-down chip is connected to the third terminal of the second filter unit, and the second pin of the step-down chip is connected to the communication module, the control module, and the switching module.

5. The testing system according to claim 4, characterized in that, The first filter unit includes a first capacitor, a second capacitor, a first diode, and a third capacitor; The first plate of the first capacitor, the first plate of the second capacitor, and the positive terminal of the first diode are connected to the battery. The negative terminal of the first diode is connected to the first plate of the third capacitor and the first end of the second filter unit. The second plates of the first capacitor, the second plate of the second capacitor, and the second plate of the third capacitor are grounded.

6. The testing system according to claim 5, characterized in that, The second filter unit includes a fourth capacitor, a first inductor, and a fifth capacitor; The first plate of the fourth capacitor and one end of the first inductor are connected to the negative terminal of the first diode, the other end of the first inductor is connected to the first plate of the fifth capacitor and the first pin of the step-down chip, and the second plate of the fourth capacitor and the second plate of the fifth capacitor are grounded.

7. The testing system according to any one of claims 1-6, characterized in that, The communication module includes: A communication chip, wherein the first pin, the second pin, and the third pin of the communication chip are respectively connected to the control module; A second inductor, one end of which is connected to the fourth pin of the communication chip; and, A protection unit, one end of which is connected to the other end of the second inductor and the vehicle refrigerator, and the other end of which is grounded.

8. The testing system according to claim 7, characterized in that, The communication module further includes: A second diode, the positive terminal of which is connected to the battery; and, A first resistor, one end of which is connected to the negative terminal of the second diode, and the other end of which is connected to the other end of the second inductor and one end of the protection unit.

9. The testing system according to claim 7, characterized in that, The control module is a microcontroller. The first, second, and third pins of the microcontroller are connected to the first, second, and third pins of the communication chip, respectively. The fourth, fifth, and sixth pins of the microcontroller are connected to the switch module, respectively.

10. A testing apparatus, characterized in that, include: Battery; A circuit board, wherein the circuit board integrates a test system as described in any one of claims 1-9, the test system being connected to the battery; A housing, the housing being embedded and covering the circuit board; and, The display screen is electrically connected to the test system and is embedded in the housing.

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