As a key equipment for simulating extreme weather and vehicle operating conditions, the automotive exhaust emission environmental chamber plays an important role in automotive research and development, environmental testing, and other fields. Its precise temperature control（-40℃to60℃）Humidity regulation（30%-95%RH）The exhaust emission test function provides reliable assurance for verifying vehicle performance. However, to ensure efficient operation of the equipment and obtain accurate data, the following usage precautions must be strictly followed:

1、 Equipment preheating and parameter calibration

Before starting the environmental chamber, sufficient preheating is required, and the temperature control system needs to be stabilized within the set range to avoid excessive temperature fluctuations caused by thermal load shocks (such as before the vehicle)0.5The temperature fluctuation at the rice control point needs to be less than±1℃）. At the same time, it is necessary to regularly calibrate the temperature sensor and anemometer to ensure that the uniformity of air flow in the cabin meets the standards and prevent local temperature differences from affecting the test results. For example, when simulating high-altitude environments, insufficient temperature control accuracy may result in distortion of engine cold start test data.

2、 Vehicle status and exhaust connection specifications

The inspected vehicle must be in normal working condition, with no engine faults and a complete exhaust emission system. When connecting the exhaust sampling pipe, a special joint with good sealing should be used to avoid gas leakage interfering with the detection results. For example, the concentration of particulate matter in diesel exhaust is high, and if the connection is not tight, it may lead toPM2.5The low detection value conceals the actual emission problem. In addition, the vehicle needs to be fixed on the drum test bench to ensure accurate simulation of driving resistance.

3、 Dynamic monitoring of environmental parameters

During the experiment, real-time monitoring of temperature, humidity, wind speed, lighting and other parameters is requiredPLCorHMIAdjust the operating status of devices such as humidifiers, dehumidifiers, and fans in the system. For example, when simulating rainstorm conditions, it is necessary to adjust rainfall through high-pressure nozzles, and monitor whether the humidity in the cabin reaches the set value (such as95%RH）. If the parameter deviates from the threshold, the experiment should be immediately paused and the fault should be investigated to prevent equipment damage or data abnormalities.

4、 Safe operation and emergency response

Operators need to receive professional training and be familiar with the emergency shutdown process of the equipment. For example, if the temperature inside the cabin loses control and exceeds60℃Immediately cut off the heating power and start the exhaust system. In addition, it is necessary to regularly check the sealing of the cabin to prevent safety hazards caused by exhaust gas leakage. For volatile organic compounds（VOC）Explosion proof electrical equipment should be used for testing and equipped with gas concentration alarm devices.

5、 Maintenance and Data Management

After the experiment, it is necessary to clean the residue in the cabin and regularly replace the air filter and sensor filter element. For example, the aging of a three-way catalyst may lead toNOxThe detection value is too high, and it is necessary to follow the manufacturer's recommendation for each3Year or10Replace after 10000 kilometers. At the same time, it is necessary to establish a test data archive to record environmental parameters, vehicle status, and detection results, providing a basis for subsequent research and development.

The efficient operation of the automobile exhaust emission environmental chamber requires a balance between technical specifications and safety management. By strictly following the key points of preheating calibration, connection sealing, parameter monitoring, safe operation, and maintenance, the accuracy and reliability of test data can be ensured, providing strong support for the green development of the automotive industry.