What is the temperature humidity environmental test chamber?

With the rapid development of new energy vehicles and intelligent connected vehicles, the reliability requirements of complete vehicles under different climatic conditions have increased significantly. From low-temperature cold starts in severe cold regions to high-temperature and high-humidity operating conditions in tropical environments, vehicles are required to maintain stable performance under various complex environmental conditions. Therefore, conducting systematic verification of complete vehicles through laboratory environmental simulation equipment has become a critical part of automotive research, development, and quality control.The Vehicle-Level High/Low Temperature and Humidity Test Chamber is a large-scale testing system capable of simulating extreme temperature and high-humidity environments. It is specially designed for reliability, durability, and environmental adaptability testing of complete vehicles or large automotive assemblies. This article will introduce the equipment from the following aspects in order to provide readers with useful reference information.

Functions and Applications of the Vehicle-Level High/Low Temperature and Humidity Test Chamber

The Vehicle-Level High/Low Temperature and Humidity Test Chamber is a large-scale environmental simulation testing system capable of reproducing extreme temperature and humidity conditions within a controlled environment. It is used to verify the performance, reliability, and safety of complete vehicles or large automotive assemblies under real-world climatic conditions.

Core Functions

The chamber provides precise control of internal temperature and relative humidity. Some advanced systems also integrate solar radiation simulation, wind speed control, low-pressure (high-altitude) simulation, and chassis dynamometer systems, enabling the simulation of multi-factor coupled environmental conditions.

Main Applications

The chamber is mainly used to test:

Cold and hot start performance of complete vehicles under extreme temperatures

Air conditioning system efficiency

Thermal management performance of the three-electric systems (battery, motor, and electronic control system)

Vehicle sealing performance

Material durability

ECU calibration adaptability

Regulatory compliance, including emissions and energy consumption requirements

It provides essential support for research and development validation, durability testing, and certification procedures.

Typical Applications

Typical vehicle-level testing applications include:

Low-temperature driving range and charging performance tests for new energy vehicles

High-altitude power loss simulation

Defrosting and defogging verification under tropical hot and humid conditions

Stability testing of electronic systems in extremely cold environments

Unlike small environmental chambers designed for component testing, this equipment is large enough to accommodate a complete passenger vehicle and supports dynamic load testing such as chassis dynamometer driving simulations.

Applicable Industries for the Vehicle-Level High/Low Temperature and Humidity Test Chamber

The Vehicle-Level High/Low Temperature and Humidity Test Chamber is mainly applicable to industries that require reliability, environmental adaptability, and performance verification of complete vehicles or large assemblies under real environmental stress conditions. The core application fields include:

Automotive Manufacturing Industry

(Conventional Fuel Vehicles, New Energy Vehicles — BEV/PHEV/HEV)

Used for:

Cold start testing

Battery thermal management evaluation

Air-conditioning thermal balance testing

High- and low-temperature driving range verification

Functional validation of automotive electronic and electrical systems, including ECUs, wiring harnesses, and sensors

The testing process complies with automotive standards such as ISO and GB/T vehicle-grade regulations.

Automotive Parts and Component Suppliers

Used for integrated performance testing of:

In-vehicle display systems

Motor controllers

Charging stations and charging systems

High-voltage distribution boxes

Other automotive assemblies under complete vehicle environmental conditions

Aerospace and Defense Industries

Applied to:

Environmental adaptability testing of military vehicles, armored vehicles, and special-purpose defense vehicles

Extreme climate verification under severe cold, desert, and other harsh environmental conditions

Commercial and Special Vehicle Industries

(Trucks, Buses, Construction Vehicles, Agricultural Vehicles)

Used to verify the stability and reliability of:

Powertrain systems

Braking systems, especially vacuum-assisted braking performance under low-pressure conditions

Electronic control systems operating across different regional climates

Third-Party Testing and Certification Organizations & R&D Laboratories

Supports:

Vehicle-level environmental compliance testing

Regulatory verification under combined temperature and humidity conditions

Emissions, energy consumption, and electromagnetic compatibility (EMC) evaluations under simulated environmental stress conditions.

Technical Features of the Vehicle-Level High/Low Temperature and Humidity Test Chamber

The Vehicle-Level High/Low Temperature and Humidity Test Chamber is a comprehensive environmental testing facility designed to simulate extreme temperature and humidity conditions for complete vehicles. Its core technical features focus on large-capacity design, high-precision environmental control, multi-parameter coordinated regulation, and compatibility with vehicle-level dynamic testing.

Wide Temperature and Humidity Range with High Stability

The typical temperature range is from -40°C to +85°C, while some advanced models can reach up to +100°C. The humidity range is generally 20%–95% RH, although the minimum humidity at low-temperature conditions is usually limited to 30% RH.

The chamber typically provides:

Steady-state temperature control accuracy of ±0.5°C to ±1°C

Humidity deviation of ±2% to ±5% RH

Internal temperature uniformity of ≤ ±2°C

Large Capacity and Full Vehicle Compatibility

The chamber dimensions are typically no smaller than 16 m × 7 m × 6 m, allowing accommodation of complete passenger vehicles or light commercial vehicles.

Optional chassis dynamometer systems can also be integrated to support synchronized “environment + driving condition” testing, including:

Wind speed simulation from 0–200 km/h

Road gradient and climbing simulations

Dynamic vehicle operation under controlled environmental conditions

Multi-Environmental Parameter Integration

In addition to temperature and humidity control, advanced chambers may integrate:

Altitude (air pressure) simulation: 0–5500 m, corresponding to 50–101 kPa

Full-spectrum solar radiation simulation: 0–1200 W/m²

Wind speed simulation: 0–20 m/s

Rainfall and icing systems

These functions enable the reproduction of highly complex combined climate environments.

Intelligent Closed-Loop Control and Dynamic Response

The chamber adopts a centralized control system based on PLC/SCADA architecture combined with PID algorithms. It coordinates multiple subsystems, including:

Refrigeration systems (liquid nitrogen or cascade compressors)

Heating systems (steam or electric heating)

Humidification systems (ultrasonic or steam spray)

Dehumidification systems (condensation or dry-air systems)

The system supports:

Pre-programmed testing cycles such as thermal shock and high-altitude climbing simulations

Real-time data feedback from hundreds of CAN bus and sensor signals

High Sealing Performance and Safety Redundancy

The chamber is equipped with:

Dual-sealing doors combining metal seals and fluororubber seals

Pressure-resistant chamber structures capable of maintaining low-pressure conditions for at least 30 minutes

Additional safety systems include:

Oxygen concentration monitoring

Emergency pressure relief devices

Explosion-proof lighting

Personnel interlock protection systems

These features comply with ISO and related industrial safety standards.

Thermal Inertia Optimization and Airflow Uniformity Design

Through the combination of high-airflow variable-frequency fans and specially designed air-guiding ducts, the chamber ensures uniform airflow distribution around the vehicle body, with turbulence levels below 5%.

This design effectively prevents localized overheating or overcooling, ensuring highly consistent environmental simulation conditions throughout the testing process.

Operating Procedure for the Vehicle-Level High/Low Temperature and Humidity Test Chamber

Vehicle high- and low-temperature testing is a critical part of the automotive manufacturing process. Its purpose is to evaluate vehicle performance and durability under various extreme climatic conditions by simulating different environmental temperatures. Such tests are typically conducted in specialized vehicle-level high/low temperature test chambers equipped with precision temperature control systems and environmental simulators capable of rapidly and accurately creating environments ranging from as high as 150°C to as low as -40°C.

Preparation Stage

Confirm the test requirements, including:

Temperature range (such as -40°C to +85°C)

Humidity range (20%–98% RH)

Test duration

Temperature change rate (typically ≤5°C/min)

Inspect the chamber sealing condition as well as the operational status of the power supply, cooling system, and humidification system. Position the complete vehicle or assembly according to testing specifications, ensuring that sensors and air ducts are not obstructed.

Connect all required data acquisition lines, including:

Power supply lines

CAN communication systems

Temperature sensors

Voltage monitoring systems

Ensure that there are no flammable or explosive materials in the testing area and that no high-temperature exhaust interference is present.

Preconditioning and Environmental Stabilization

If “cold soak” or “heat soak” testing is required, the vehicle should first be placed in an external target environment (such as a -40°C cold storage room) for at least 8 hours to allow core components, including the battery, ECU, and fluids, to reach thermal equilibrium.

Clean the interior of the chamber before testing. The humidification system should use deionized water, and the drainage system must be checked to ensure smooth operation.

Program Setting

Input multi-stage temperature and humidity profiles through the PLC, touchscreen controller, or supervisory computer software. Typical test programs may include:

Low-temperature storage at -40°C for 24 hours

Rapid heating to +85°C within 10 hours

Constant-temperature holding periods

Repeated thermal cycling procedures

Set environmental control parameters, including:

Temperature and humidity control accuracy (±0.5°C / ±2.5% RH)

Wind speed simulation (typically equivalent to 0–120 km/h airflow)

Pressure settings for altitude simulation (for example, 54 kPa corresponding to an altitude of approximately 5000 m)

Start-Up and Monitoring

Close the double-layer sealed chamber door, activate the interlock protection system, and start the programmed testing sequence.

During operation, continuously monitor:

Multi-point temperature and humidity uniformity inside the chamber (≤ ±2°C)

Vehicle operating conditions

Fault codes

Battery temperature rise

Air-conditioning system performance

Chamber pressure

Refrigerant pressure

Personnel are strictly prohibited from entering the chamber during operation.

Test Holding and Functional Verification

Once the specified environmental conditions are reached, begin timing the test according to the test protocol.

Conduct required functional evaluations, such as:

Low-temperature starting tests

High-temperature idling tests

Durability testing of electronic components under hot and humid conditions

Record environmental parameters and vehicle response data, including:

Motor torque reduction

Screen response speed

Windshield fogging conditions

Frequent opening of the chamber door during testing should be avoided. If intervention is necessary, pressure must first be equalized and the chamber restored to normal temperature conditions.

Completion and Recovery

After the testing program is completed:

Stop the heating and humidification systems.

Gradually reduce the chamber temperature to prevent condensation.

Open the chamber door only after the internal temperature falls below 30°C and humidity drops below 60% RH.

Disconnect vehicle power supplies and inspect for:

Condensation water

Insulation abnormalities

Other potential issues

Clean the chamber interior, complete the test log, and export all testing data.

Safety and Maintenance Requirements

Operators must be professionally trained and authorized before operating the equipment. All interlock protection mechanisms for over-temperature, over-pressure, and water shortage conditions must be strictly followed.

Regular maintenance includes:

Calibration of platinum resistance temperature sensors and capacitive humidity sensors

Cleaning of air ducts and humidification tanks

Inspection of sealing systems and safety devices

Vehicles containing volatile fuel leakage or undepleted high-voltage electrical systems must never be tested under any circumstances to ensure operational safety.

Importance of the Vehicle-Level High/Low Temperature and Humidity Test Chamber

The Vehicle-Level High/Low Temperature and Humidity Test Chamber is a core platform for ensuring that automobiles operate safely, reliably, and compliantly under all climatic conditions. Its importance is mainly reflected in four key dimensions: reproducing global extreme climates, accelerating validation cycles, supporting regulatory compliance, and assisting the development of electric powertrain systems.

Global Climate Adaptability Verification

The chamber can accurately simulate temperature ranges from -40°C to +85°C and humidity conditions from 10% to 95% RH, covering global operating environments from Arctic cold regions to tropical deserts.

It is used to verify:

Vehicle cold and hot start performance

Air-conditioning efficiency

Defrosting and defogging capability

Vehicle sealing performance

Thermal management performance of the three-electric systems (battery, motor, and electronic control systems)

Overall durability and environmental adaptability

Improved R&D Efficiency and Testing Consistency

Environmental chambers compress what would traditionally require several months of global road testing into a few weeks of controllable laboratory testing.

The system provides:

High repeatability

Full traceability

Multi-factor coupled testing, including temperature, humidity, solar radiation, airflow, and chassis dynamometer simulation

This significantly shortens vehicle development cycles while reducing the cost of real-world road testing.

Essential Support for Regulatory Compliance and Emissions Certification

Strict global regulations such as China VI-b, Euro 7. and CARB standards require complete vehicle testing under environmental conditions ranging from approximately -30°C to +50°C.

The chamber supports:

Vehicle exhaust emission testing

Evaporative emission (SHED) testing

WLTC and CLTC driving cycle verification

As a result, the environmental chamber has become an indispensable platform for legal certification and compliance approval.

Critical Support for New Energy Vehicle Development

The chamber enables precise evaluation of:

Battery charging and discharging performance under high and low temperatures

Driving range degradation

Thermal runaway risks

Heat pump and PTC heating efficiency

It also verifies:

Electric drive system calibration

Fast-charging compatibility

High-voltage electrical safety

These tests directly determine the global market access capability of new energy vehicle products.

Reliability Screening of Materials and Vehicle Systems

Through temperature-humidity cycling, storage testing, and alternating environmental stress testing, the chamber can identify hidden defects such as:

Interior material aging

Rubber cracking and brittleness

Moisture-sensitive electronic failures

Wiring harness corrosion

This effectively helps prevent after-sales failures and recall risks while improving overall vehicle weather resistance and brand reputation.

Future Development Trends

With the advancement of technology and industrial development, vehicle-level high/low temperature test chambers will continue evolving toward greater intelligence and automation, further improving testing efficiency and accuracy.

In the future, more innovative technologies and advanced systems are expected to be integrated into this field, bringing new momentum to the development of the automotive industry.

Vehicle high- and low-temperature testing is essential for ensuring the safe and reliable operation of automobiles under various climatic conditions worldwide. It not only helps identify design defects and improve product quality but also provides users with a safer and more comfortable driving experience. Through rigorous testing procedures, manufacturers can ensure outstanding product performance even in harsh environments, thereby enhancing market competitiveness and customer satisfaction.

For more detailed information or specific testing case studies, we sincerely welcome you to leave a message or contact us directly. We would be pleased to provide you with more comprehensive product information and technical support.