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Vehicle EMC/EMI Dynamometer System

The vehicle EMC/EMI test system generally consists of an anechoic chamber or reverberation chamber, measuring instruments, and a hub dynamometer system that simulates the road load of the vehicle. The rotating hub dynamometer system that simulates vehicle load can be designed as a two-wheel drive, four-wheel drive or more shaft drive dynamometer according to the number of drive shafts of the vehicle. The dynamometer system can also adopt a structural type embedded in the turntable, or a mobile type.
Product Description

EMC compliance testing Emission and Immunity testing- Vehicle EMC (Electromagnetic Compatibility) testing is a vital procedure that evaluates a vehicle’s ability to operate effectively in its electromagnetic environment without causing or suffering from interference. As vehicles become more sophisticated with integrated electronic systems like advanced driver-assistance, infotainment, and navigation, ensuring reliable performance under various electromagnetic conditions is increasingly essential.

The testing process focuses on two primary areas: emissions and immunity.

  • Emissions testing measures the electromagnetic radiation emitted by the vehicle. This step identifies any signals that could interfere with other electronic devices nearby, ensuring the vehicle complies with regulatory standards for electromagnetic emissions.
  • Immunity testing assesses the vehicle’s ability to withstand external electromagnetic interference, such as signals from mobile phones or radio transmitters. It verifies that critical systems continue to function correctly even when exposed to strong electromagnetic fields.

Together, these tests ensure that modern vehicles maintain safe and dependable operation in environments filled with potential electromagnetic disturbances.

1. Stationary Dynamometer System

The embedded dynamometer system generally consists of a drum unit and a dynamometer unit that simulate the load before and after, and the distance between the drum units is adjustable. Embedded dynamometers are generally embedded in the turntable and can rotate with the turntable; or embedded in the raised floor. Before the test, according to the wheelbase of the vehicle, adjust the moving axle unit of the dynamometer to the required distance. The interface will input the vehicle into the hub, lock the vehicle front and rear through the ratchet strap, connect the exhaust pipe, and start test. The dynamometer system has the following characteristics:

1. Each dynamometer unit is an independent unit for modular assembly.
2. Each dynamometer unit can carry out independent torque or speed control to simulate road load.
3. It can be used for vehicle testing in anechoic chamber or reverberation chamber.
4. Can be customized design according to user needs.
5. The spacing of the multi-axis dynamometer is adjustable to adapt to vehicle testing with different wheelbases.

6. It can be equipped with automatic driving robot, exhaust emission system, vehicle windward system, etc.

7. The unique shielding technology can meet the Class5 requirements of CISPR25.
8. The dynamometer has high torque and speed control accuracy and high repeatability.
9. The dynamometer can be embedded in the turntable or under the raised floor.
10. The vehicle fixing device is integrated with the dynamometer body, which is firm and reliable.
11. It has a vehicle tire burst detection device.
12. With vehicle centering detection device.
Recommended dynamometer parameters:
Type
Prated(kW)/Axis
Frated(N)(b)/Axis
Vmax(km/h)
Vrtated(rpm)
F2(N)@ Vmax/Axis
ECD-A22-X(a)
44
2153
100
60
1583
ECD-B34-X
68
4250
100
60
2231
ECD-B74-X
148
6500
100
60
4400
a) X—indicates the number of axles of the dynamometer (for example: four-wheel drive vehicles, generally use 2-axis drive dynamometer)
b) Frated—represents the traction of a single drive shaft of the dynamometer. The overall traction force of the dynamometer system is the number of active axles of the dynamometer multiplied by the traction force of a single axle

2. Mobile dynamometer system

The mobile chassis dynamometer adopts a modular structure, and the bottom is designed with heavy-duty bearing universal wheels, which can be pushed into the anechoic chamber, and the adjustable bracket is placed in the supporting position, and the vehicle is driven through the approach bridge into the test position and connected Drive the vehicle into the chassis dynamometer with power cables, communication optical fibers, and pneumatic pipelines, and fix the vehicle with a ratchet strap to start the test.
The dynamometer system has the following characteristics:
1. Each dynamometer unit is an independent unit for modular assembly.
2. Each dynamometer unit can carry out independent torque or speed control to simulate road load.
3. It can be used for vehicle testing in anechoic chamber or reverberation chamber.
4. Can be customized design according to user needs.
5. The spacing of the multi-axis dynamometer is adjustable to adapt to vehicle testing with different wheelbases.
6. It can be equipped with automatic driving robot, exhaust emission system, vehicle windward system, etc.
7. The unique shielding technology can meet the Class5 requirements of CISPR25.
8. The dynamometer has high torque and speed control accuracy and high repeatability.
9. The dynamometer can be embedded in the turntable or under the raised floor.
10. The vehicle fixing device is integrated with the dynamometer body, which is firm and reliable.
11. It has a vehicle tire burst detection device.
12. With vehicle centering detection device.
Type
Prated(kW)/Axis
Frated(N)(b)/Axis
Vmax(km/h)
Vrtated(rpm)
F2(N)@ Vmax/Axis
H(mm)
ECD-A22-X-F
44
2153
100
60
1583
420
Note:
(a) X—represents the number of axles of the dynamometer (for example: a four-wheel drive vehicle, generally use a 2-axis drive dynamometer)
(b) Frated—represents the traction of a single drive shaft of the dynamometer. The overall traction force of the dynamometer system is the number of active axles of the dynamometer multiplied by the traction force of a single axle

The rotating drum is an important component of the vehicle EMC testing system used to simulate road friction.

Drum
The drum is a component of the testing system, usually made of metal. It has a surface with a certain roughness to simulate the friction of the road surface. The vehicle’s tires come into direct contact with the drum, creating friction.

Hard chrome coating
The surface of the drum is usually coated with hard chrome. This coating is abrasion and oil-resistant and increases the life of the drum.

Assembled construction
Drums are usually assembled. Before precision machining, the drum needs to be stress-relieved to ensure stability and performance.

Support and dynamic balancing
The drum assembly is supported at both ends by heavy-duty grease-lubricated spherical roller bearings. After assembly, dynamic balancing is also required to ensure that the drum operates without vibration or imbalance.

  • Autopilot robot:The self-driving robot uses pneumatic actuators to control the vehicle’s throttle and brake pedals. In the control room, the operator can manually control the travel of the pneumatic actuators to accelerate and decelerate the vehicle. This system can be automated or switched to manual mode to give the operator more flexibility in controlling the vehicle.

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