INTRODUCTION TO CAMERA-MONITOR SYSTEMS(CMS)

INTRODUCTION TO CAMERA-MONITOR SYSTEMS(CMS)

RELEASE DATE:2023-08-29 17:13

Brief: Since the publication of the UN R46 regulation in June 2016, more and more new models in Europe have opted to install a CMS camera-monitor system in place of a traditional mirror for a better presentation of the surrounding field of vision.On 21 July 2023, the EU made a brand new amendment to UN R46, which contains a better specification of the CMS, in order to improve the use of the system by CMS fitted vehicles in terms of their safety and effectiveness of the system in cars fitted with CMS.



INTRODUCTION TO CMS
CMS (Camera-monitor System) is a system consisting of one (several) cameras and one (several) monitors, which is used to indirectly present the front, side or rear view of a vehicle. CMS works simply by capturing the corresponding field of view with the help of a camera and processing, transmitting and presenting the image of the field of view on the car's monitor at an appropriate ratio, so that the driver can judge the surrounding road conditions directly through the monitor.

CMS applicable models: 
M, N, L category motor vehicles.

CLASSIFICATION OF CMS
As with conventional vision mirrors, CMS is mainly classified into seven categories, ranging from Category I to Category VII. The general difference between different categories of CMS is as follows:
Classification
Direction of view
Camera mounting position
Class I
Rearward of vehicle body
Inside the vehicle
Class II
Rearward slanting side of the vehicle
Outside the car
Class III
Rearward slanting side of the vehicle
Outside the vehicle
Class IV
wide-angle sideward
Outside the vehicle
Class V
close-proximity sideward
Outside the vehicle
Class VI
Frontward of the vehicle
Outside the vehicle
Class VII
Rearward slanting side of the vehicle
Outside the vehicle

Among them, the main difference between Class II, III and VII CMS is the different field of view presented.

SOME TECHNICAL REQUIREMENTS OF CMS PARTS
1. Can be freely adjusted without tools;
2. Under the condition of room temperature 22℃±5℃, the whole process of scanning, presenting and resetting the device to the initial position shall not exceed 200 milliseconds.
3. Class I to Class IV CMS must not be adversely affected by magnetic or electrical fields.
4. The radius of curvature of the installed CMS or its components must not be less than 2.5mm, but if the outer surface protrudes less than 5mm, the angle of inclination is required to be less than 1.5mm.
5. The camera still functions well under sunlight (light intensity 40 klx).
6. The contrast, grey scale, brightness, image quality, lateral uniformity, artifacts and other characteristics of the monitor should meet the corresponding test requirements.
7.CMS can withstand certain impact.
......

SOME TECHNICAL REQUIREMENTS OF CMS ON THE WHOLE VEHICLE
1. The imaging of CMS will not cause the driver to be puzzled by the image due to the vibration generated by the movement of the car.
2. The field of view of CMS will not be affected by the light transmission factor of the vehicle's safety glass.
3. The number of monitor installations must not exceed the number of corresponding mirrors.
4. The field of view of the CMS imaging shall be present at all times from the time the vehicle is activated to the time it is deactivated.
5. The driver can clearly see the road situation in all directions of the vehicle from his seat, and for Class I CMS the driver can adjust it from his seat.
6. The obstruction of the field of view presented by the CMS must not exceed a certain percentage, e.g. 15% for Class I CMS.
7. The CMS shall be designed in accordance with certain functional safety concepts, in particular with reasonable warnings and countermeasures against possible failures of electrical components.
......

SUMMARY AND OUTLOOK
All in all, camera-monitor system(CMS) technology is complex, involving a variety of technical requirements, for example, there are certain requirements for EMC, compared with the traditional mirror, undoubtedly need more test content. However, due to its great advantages in imaging, coupled with the continuous improvement of CMS technology by major car manufacturers, it is foreseeable that CMS has a lot of room for development in the future.

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EU CERTIFICATION PLEASE CONTACT
Justin
Justin Jiang
Global Regulatory Research Department
Justin is a global automotive regulatory researcher at ATIC, focusing on automotive electronics and automotive connected grid cross-domain compliance and certification solutions.
Phone: +86 020-82510156
Mail: cs@atic-cn.com