New energy automobile air conditioner teaching simulation system

Abstract

The invention relates to the technical field of vocational education equipment, in particular to a new energy automobile air conditioner teaching simulation system, which comprises a teaching framework provided with a new energy automobile air conditioner assembly; the power module is arranged on the teaching framework and connected with the new energy automobile air conditioner assembly; the detection module is arranged on the teaching framework; the control module is arranged on the teaching framework and used for controlling system starting, mode switching and circuit protection; and the fault setting module is arranged on the teaching framework and is used for setting and simulating common faults of the air conditioner of the new energy automobile. The industrial-grade high-voltage conversion technology is innovatively combined with teaching scene requirements, and a multi-stage safety protection mechanism and a configurable fault setting module are arranged, so that the skill training requirements of students on air conditioning system detection, inspection and fault removal can be met, and the potential safety hazard problem of high-voltage equipment in traditional teaching is solved; and the teaching effect and the practical training safety of the new energy automobile air conditioning system are obviously improved.

Description

Technical Field

[0001] This invention relates to the field of vocational education equipment technology, specifically a new energy vehicle air conditioning teaching simulation system. Background Technology

[0002] With the rapid development of the new energy vehicle industry, the market demand for professionals with new energy vehicle maintenance skills is increasing. As a key component of new energy vehicles, the air conditioning system differs significantly in structure and principle from that of traditional fuel vehicles, especially given the new teaching challenges brought about by its high-voltage electric drive characteristics.

[0003] Existing automotive air conditioning teaching equipment has the following shortcomings: 1. Conflict between safety and authenticity: Traditional teaching often uses low-voltage simulation or simplified models, which cannot truly reflect the working characteristics of the 350V high-voltage air conditioning system of new energy vehicles; while directly using real vehicle parts for teaching poses extremely high safety risks.

[0004] 2. Disconnect between structural display and practical training: Some demonstration platforms can only statically display components and lack operable pipe connection and circuit testing functions, making it difficult for students to conduct practical training in troubleshooting.

[0005] 3. High-voltage conversion technology is not suitable for teaching scenarios: Existing industrial-grade high-voltage conversion equipment (although it can achieve voltage conversion, it does not take into account the special needs of frequent operation and misoperation in teaching scenarios) and lacks targeted safety protection design.

[0006] 4. Lack of fault simulation function: Most of the existing teaching equipment is an ideal simulation of operation, which cannot simulate common problems in actual maintenance such as sensor failure and pipeline blockage, resulting in insufficient training of students' practical skills.

[0007] Therefore, developing a new energy vehicle air conditioning simulation system that combines realism, safety, and educational relevance has become an urgent technical problem to be solved in the field of vocational education. Summary of the Invention

[0008] To address the aforementioned technical problems, this invention proposes a teaching simulation system for air conditioning in new energy vehicles. It aims to resolve issues such as insufficient safety, lack of realism, and limited teaching functions in existing teaching equipment for new energy vehicle air conditioning.

[0009] The technical problem to be solved by this invention is achieved by the following technical solution: A new energy vehicle air conditioning teaching simulation system includes: The teaching framework includes a section on air conditioning assemblies for new energy vehicles. The power module, set on the teaching framework, is connected to the air conditioning assembly of the new energy vehicle and is used to provide the power required for simulated teaching. The detection module, set up within the teaching framework, is used to detect the current, voltage, and temperature of the air conditioning assembly and power module of new energy vehicles during operation. The control module, set up within the teaching framework, is used to control system startup, mode switching, and circuit protection. The fault setting module, set within the teaching framework, is used to simulate common faults in the air conditioning systems of new energy vehicles.

[0010] As a further improvement of the present invention, the power module includes a frequency converter and a compressor; The inverter's input terminal is connected to a 220V AC power supply, its output terminal is connected to the compressor, and its control terminal is connected to the control module. The compressor is connected to the piping system.

[0011] As a further improvement of the present invention, the detection module includes: Current transformers are used to detect compressor current; Voltage transformers are used to detect compressor voltage; The display instrument is used to display the current and voltage values ​​of the compressor and the air conditioning assembly of new energy vehicles; An indoor temperature sensor is installed at the air outlet of the air conditioning assembly in a new energy vehicle. The outdoor temperature sensor is located near the air conditioning assembly of the new energy vehicle; A digital display instrument is used to show the temperature values ​​detected by the indoor and outdoor temperature sensors.

[0012] As a further improvement of the present invention, the control module includes: The start switch and emergency stop button are used to start and stop the system. The thermostat is used to switch between cooling and heating modes; Thermal relays are used for overcurrent protection. Zener diodes are used for overvoltage protection. Intermediate relays are used to prevent the cooling and heating circuits from being connected simultaneously.

[0013] The beneficial effects of this invention are: This invention innovatively combines industrial-grade high-voltage conversion technology with the needs of teaching scenarios, setting up a multi-level safety protection mechanism and a configurable fault setting module. It can not only meet students' skills training requirements for air conditioning system testing, inspection and troubleshooting, but also solve the safety hazards of high-voltage equipment in traditional teaching, significantly improving the teaching effect and training safety of new energy vehicle air conditioning systems. Attached Figure Description

[0014] The present invention will be further described below with reference to the accompanying drawings and embodiments: Figure 1 This is a schematic diagram of the isometric structure of the present invention. Figure 1 ; Figure 2 This is a schematic diagram of the isometric structure of the present invention. Figure 2 .

[0015] In the diagram: 1. Teaching framework; 2. New energy vehicle air conditioning assembly; 3. Compressor; 4. Display instrument; 5. Digital display instrument; 6. Start switch; 7. Emergency stop button; 8. Fault setting module; 9. Inverter; 10. Radiator; 11. Mode switching switch. Detailed Implementation

[0016] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0017] like Figure 1 and Figure 2 As shown, a teaching simulation system for air conditioning in new energy vehicles adopts a modular layout. It converts 220V AC power into adjustable three-phase variable frequency voltage via a frequency converter to drive an electric compressor, completely simulating the cooling and heating process of an air conditioner in a new energy vehicle. The system is equipped with comprehensive testing terminals and fault setting functions, making it suitable for teaching and practical training in new energy vehicle majors at secondary and higher vocational colleges. It can achieve teaching objectives such as understanding the structure of the air conditioning system, demonstrating its working principles, and diagnosing and troubleshooting faults.

[0018] This teaching simulation system includes a teaching framework 1, a power module, a detection module, a control module, and a fault setting module 8.

[0019] The core technical parameters of this teaching simulation system include: Input power: AC220V±10%, 50Hz; Compressor operating voltage: DC 0V—35V (simulated high-pressure system); Inverter output: Three-phase AC 0-35V adjustable, frequency 0-50Hz; Temperature detection range: -30℃~80℃, accuracy ±0.5℃; Current measurement range: 0-50A; Voltage measurement range: 0-500V; Fault setting types: more than ten common faults such as open circuit, short circuit, and loose connection; Protection functions: overcurrent (≥10A), overvoltage (≥60V), overload, and overheat protection.

[0020] As a further improvement to this embodiment, the teaching frame 1 is constructed using an aluminum alloy profile frame, with a 20mm thick colored high-density composite board covering the tabletop. The overall dimensions are 1900mm × 800mm × 1500mm, the operating temperature range is -35℃ to 40℃, and the equipment weighs approximately 220KG. A new energy vehicle air conditioning assembly 2 is installed on the teaching frame 1. The power module, detection module, control module, and fault setting module 8 are correspondingly installed on the teaching frame 1.

[0021] As a further improvement to this embodiment, the power module is connected to the new energy vehicle air conditioning assembly 2 to provide the power required for simulated teaching. The power module includes a frequency converter 9 and a compressor 3. The frequency converter 9 is a general-purpose three-phase frequency converter. The main circuit terminals L1, L2, and L3 of the frequency converter 9 are connected to 220V AC power. The output terminals T1, T2, and T3 of the frequency converter 9 are connected to the compressor 3. The control terminal FWD of the frequency converter 9 is connected to the start switch 6 in the control module. The AVI terminal of the frequency converter 9 is connected to a potentiometer to realize frequency adjustment. The frequency adjustment range is 0-50Hz, corresponding to the speed of the compressor 3 from 0-6000r / min. A braking resistor (connected to +1 and +2 terminals) is configured for rapid shutdown. The compressor 3 adopts the original electric compressor of the new energy vehicle, retaining the original high-voltage plug (including positive and negative terminals) and low-voltage plug (6 pins: two CAN communication lines, two 12V power lines, and two interlock signal lines). The compressor 3 controller has a built-in IGBT inverter circuit to convert DC power into three-phase AC power to drive the compressor.

[0022] As a further improvement to this embodiment, the detection module is used to detect the current, voltage, and temperature of the air conditioning assembly 2 and the power module of the new energy vehicle during operation. The detection module includes: A current transformer is used for current detection of the compressor 3. A Shenzhen Hengtong 123A type (100:5 ratio) current transformer is connected in series in the main circuit of the compressor 3, and a (50:5 ratio) current transformer is connected in series in the blower and cooling fan circuits of the new energy vehicle air conditioning assembly 2 respectively.

[0023] A voltage transformer is used for voltage detection of the compressor 3. A Shenzhen Hengtong PT107 voltage transformer (transformation ratio 1000:1) is used to detect the voltage of the compressor 3, and the low-voltage circuit is directly sampled.

[0024] The display instrument 4 is equipped with four digital ammeters (range 0-30A) and four digital voltmeters (range 0-500V) to display the current and voltage values ​​of the compressor 3, the blower in the new energy vehicle air conditioning assembly 2, and the left and right cooling fans.

[0025] An indoor temperature sensor is installed at the air outlet of the air conditioning assembly 2 in the new energy vehicle using an NTC thermistor (10kΩ@25℃).

[0026] An outdoor temperature sensor, using the same type of NTC thermistor, is installed near the condenser in the air conditioning assembly 2 of the new energy vehicle. A radiator 10 is located behind the condenser in the air conditioning assembly 2 of the new energy vehicle.

[0027] The digital display instrument 5 receives temperature signals and converts them into 0-5V voltage signals through a conditioning circuit, which are used to display the temperature values ​​detected by the indoor and outdoor temperature sensors.

[0028] As a further improvement to this embodiment, the control module is used to control system startup, mode switching, and circuit protection. The control module includes a control section and a protection section. The control section includes: The start switch 6 and the emergency stop button 7 are used to start and stop the system. The start switch 6 controls the on / off state of the FWD terminal of the frequency converter 9, and the emergency stop button 7 is connected in series with the start switch 6.

[0029] A thermostat is used to switch between cooling and heating modes. In cooling mode, it connects the compressor 3 and the piping in the new energy vehicle air conditioning assembly 2, forming a series connection with the radiator 10 and evaporator; in heating mode, it connects the PTC heater in the new energy vehicle air conditioning assembly 2, and the two are electrically interlocked. The thermostat used is an SRE07F type thermostat to achieve closed-loop temperature control. Cooling mode: When the indoor temperature is greater than the set value + 1℃, the compressor starts, the cooling fan runs, and the blower speed is automatically adjusted according to the temperature difference (3 speed levels).

[0030] Heating mode: When the indoor temperature is less than the set value -1℃, the PTC heater starts and the blower runs.

[0031] Temperature setting range: 16℃~30℃, adjustment accuracy: ±0.5℃.

[0032] The protected components include: Overcurrent protection: The thermal relay is designed to trip and cut off the power supply when the current reaches 5A.

[0033] Overvoltage protection: A voltage regulator (60V) is used to detect the voltage of the compressor 3. When overvoltage occurs, it breaks down and conducts VT2, causing the thermal relay to cut off the output.

[0034] Cooling / Heating Interlock: This is achieved through the normally open / normally closed contacts of an intermediate relay, ensuring that the cooling and heating circuits are not connected simultaneously.

[0035] As a further improvement to this embodiment, the fault setting module 8 is used to set common faults in the air conditioning of new energy vehicles. The fault setting module 8 supports no fewer than twenty single and compound fault settings, and employs an arc extinguishing protection circuit to ensure operational safety. The fault setting module 8 includes a compressor fault setting area, a blower fault setting area, a cooling fan fault setting area, a sensor fault setting area, and a detection terminal fault setting area. The compressor fault setting area includes open circuit fault settings, loose connection fault settings, and overcurrent simulation switch fault settings. The blower fault setting area includes open circuit fault settings, short circuit fault settings, and voltage abnormality switch fault settings. The sensor fault setting area includes temperature signal drift fault settings and open circuit switch fault settings. In the detection terminal fault setting area, 2mm copper pillar measuring terminals are set at each key node, with pin numbers labeled to correspond to the original factory circuit diagram.

[0036] Working principle and usage process of this invention: I. Pre-power-on inspection.

[0037] Confirm that all lines are connected correctly, the distance between high-voltage lines (marked in red) and low-voltage lines (marked in blue) is ≥20cm, and they are arranged vertically at intersections. Check that the grounding is reliable (PE terminal grounding resistance ≤4Ω), all protective covers are installed in place, all fault setting switches are set to the "normal" position, and the emergency stop button is in the pop-up position.

[0038] II. Power-on operation steps.

[0039] Close the main power switch and observe the power indicator light illuminate; turn on the power of the frequency converter 9 and wait for the self-test to complete (approximately 3 seconds); select the cooling / heating mode according to the experimental requirements; press the start switch 6, slowly adjust the frequency, and observe the operating status of the compressor 3.

[0040] III. System Operation Procedures.

[0041] Taking a refrigeration system experiment as an example: Switch the mode switch 11 to "cooling" and set the temperature to 22℃; press the start switch 6 and adjust the frequency of the inverter 9 to 30Hz (approximately 3000r / min); observe the display instrument 4: the compressor 3 voltage should be stable at around 35V, the current should be 5-8A, the cooling fan should start automatically, and the current should be approximately 1.5-2A; as the indoor temperature gradually decreases, the blower speed should be automatically adjusted according to the temperature difference; record the current and voltage values ​​at different frequencies and plot the compressor characteristic curve.

[0042] IV. Fault Diagnosis Training.

[0043] Taking the "compressor not working" fault as an example: Teachers can set a "compressor relay open circuit" fault through fault setting module 8; Student diagnostic process: Step 1: Observe the phenomenon (compressor does not start, current is 0); Step 2: Measure the voltage at the compressor plug (it should be 0V); Step 3: Check the control circuit (measure the relay coil voltage, which is 12V, which is normal; the resistance between the contacts is ∞, indicating an open circuit). Step 4: Troubleshoot (short-circuit the fault point or replace the relay); Step 5: Verify and repair (compressor starts normally, current returns to normal).

[0044] V. Common Fault Settings and Troubleshooting: Fault symptoms: Compressor does not start; poor cooling effect; blower does not turn; abnormal temperature display; indoor sensor short circuit.

[0045] Fault location: Open circuit at FWD terminal of inverter 9; loose connection of cooling fan; blower fuse open circuit; short circuit of indoor sensor; faulty voltage adjustment knob.

[0046] Diagnostic methods: Measure the voltage between FWD and COM (should be 0V); measure the fan current <1A (normal 2A); measure the voltage difference across the fuse terminals (12V); measure the sensor resistance <100Ω; measure the compressor voltage >60V.

[0047] Troubleshooting steps: Repair wiring connections; tighten plugs; replace fuses; replace sensors; repair adjustment circuits.

[0048] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely prisms of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A teaching simulation system for air conditioning in new energy vehicles, characterized in that: include: The teaching framework (1) includes a new energy vehicle air conditioning assembly (2). The power module is set on the teaching frame (1) and connected to the new energy vehicle air conditioning assembly (2) to provide the power required for simulated teaching; The detection module is set on the teaching framework (1) and is used to detect the current, voltage and temperature of the air conditioning assembly (2) and power module of the new energy vehicle when they are working. The control module is set on the teaching framework (1) and is used to control system startup, mode switching and circuit protection; The fault setting module (8) is set on the teaching framework (1) and is used to set up common faults of air conditioning in simulated new energy vehicles.

2. The new energy vehicle air conditioning teaching simulation system according to claim 1, characterized in that: The power module includes a frequency converter (9) and a compressor (3); The input terminal of the frequency converter (9) is connected to 220V AC power, the output terminal is connected to the compressor (3), and the control terminal is connected to the control module; The compressor (3) is connected to the pipeline system.

3. The new energy vehicle air conditioning teaching simulation system according to claim 2, characterized in that: The detection module includes: Current transformer, used to detect compressor (3) current; A voltage transformer is used to detect the output voltage of the compressor (3); The display instrument (4) is used to display the current and voltage values ​​of the compressor (3) and the air conditioning assembly (2) of the new energy vehicle; An indoor temperature sensor is installed at the air outlet of the air conditioning assembly (2) of the new energy vehicle; An outdoor temperature sensor is located near the air conditioning assembly (2) of the new energy vehicle; The digital display instrument (5) is used to display the temperature values ​​detected by the indoor temperature sensor and the outdoor temperature sensor.

4. The new energy vehicle air conditioning teaching simulation system according to claim 1, characterized in that: The control module includes: Start switch (6) and emergency stop button (7) are used to start and stop the system. The thermostat is used to switch between cooling and heating modes; Thermal relays are used for overcurrent protection. Zener diodes are used for overvoltage protection. Intermediate relays are used to prevent the cooling and heating circuits from being connected simultaneously.

5. The new energy vehicle air conditioning teaching simulation system according to claim 1, characterized in that: The fault setting module (8) includes a compressor fault setting area, a blower fault setting area, a cooling fan fault setting area, a sensor fault setting area, and a detection terminal fault setting area.

6. The new energy vehicle air conditioning teaching simulation system according to claim 5, characterized in that: The compressor fault setting area includes open circuit fault settings, loose connection fault settings, and overcurrent simulation switch fault settings.

7. A teaching simulation system for air conditioning in new energy vehicles according to claim 5, characterized in that: The blower fault setting area includes open circuit fault settings, short circuit fault settings, and voltage abnormality switch fault settings.

8. A teaching simulation system for air conditioning in new energy vehicles according to claim 5, characterized in that: The sensor fault setting area includes temperature signal drift fault settings and circuit breaker fault settings.

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