Minibus Aircon achieves deep resistance to extreme high and low temperature environments through a triple technological approach: material strengthening, system redundancy design, and intelligent thermal management. It covers all operational conditions from -40°C to 60°C, with core performance indicators far exceeding industry standards.
The dynamic operating condition verification covers an environmental range of -30°C to 55°C. This range encompasses the extreme climatic conditions that Yutong buses may encounter in actual operation, including the severe winters of Northeast China, the high temperatures of South China, and temperature fluctuations in high-altitude regions.
In the environmental chamber test, the system cycles through a gradient temperature (-30°C → -10°C → 0°C → 25°C → 40°C → 55°C), stabilizing each temperature point for 30 minutes, while simultaneously simulating 10%-100% variable frequency output of the compressor (e.g., from idle to full load operation). This process focuses on verifying the sealing performance of the compressor and piping connections, the stability of refrigerant flow, and the temperature response accuracy of the electronic control system under drastic temperature changes (requiring a stabilization time of <3 minutes within ±1℃ of the target temperature).
This “full temperature range + variable load” verification method ensures that the compressor unit maintains an ultra-low leakage rate of <0.5g/year across all operating scenarios in China, from Mohe in Heilongjiang to Sanya in Hainan, directly supporting the air conditioning system’s mean time between failures (MTBF) of over 6000 hours.
Minibus Aircon Electronic Control System’s Resistance to High and Low Temperatures
This is a core verification item to ensure the minibus air conditioning system maintains a constant cabin temperature under extreme environments.
During testing, the ambient cabin temperature changes in a gradient (e.g., a sudden increase from -30℃ to 55℃), while simulating cabin sensor input signals to test the temperature control performance of the electronic control system (e.g., a dual-core MCU controller). Specific performance indicators include:
Response speed: When the set temperature changes from 20℃ to 26℃, the system must stabilize the cabin temperature to within ±1℃ of the target value within 3 minutes;
Interference resistance: During high-frequency compressor start-stop (simulating pressure fluctuations caused by road bumps), the temperature fluctuation range must be ≤±0.5℃;
Load adaptability: When the number of passengers increases from 5 to 50 (simulating changes in heat load), the electronic control system should automatically adjust the fan speed and compressor frequency to maintain the set temperature.
For example, in the -20℃ extreme cold test, the system needs to verify the switching logic between the PTC heater and waste heat recovery: When the engine coolant temperature rises to 60℃, the electronic control system should switch from PTC pure heating mode to waste heat recovery mode within 15 seconds to avoid energy waste. This data will be uploaded to the MES system in real time and compared with the standard curve. Products with deviations exceeding 5% will automatically trigger a rework process.
This rigorous verification of the precision of electronic control response is directly related to passenger comfort and energy consumption control. Actual test data shows that the Minibus Aircon, which passed the test, can control cabin temperature fluctuations within ±1.2℃ during actual operation, and its energy consumption is reduced by 8% compared to systems that did not pass the verification.
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