BRIEF INTRODUCTION OF UN ECE R151 FOR BLIND SPOT INFORMATION SYSTEM OF HEAVY VEHICLES

BRIEF INTRODUCTION OF UN ECE R151 FOR BLIND SPOT INFORMATION SYSTEM OF HEAVY VEHICLES

RELEASE DATE:2020-08-10 15:40
Briefly:When a truck is turning, it is easy to collide with a bicycle due to its limited visibility. This situation generally occurs at low speed or at a standstill, and usually has serious consequences for vulnerable road users (VRU).



INTRODUCTION TO THE BLIND SPOT INFORMATION SYSTEM
Due to the large size of the truck, there are many blind spots during the driving process. In the past, the sightline of the truck driver was improved by increasing the number of rearview mirrors and equipping the truck with underside protection devices. However, turning accidents still occurred, so blind spot monitoring was introduced. System Blind Spot Information System (BSIS), which can effectively avoid collisions between trucks and bicycles when turning.
*"Bicycle" means a combination of a bicycle and cyclist.

BSIS WORKING PRINCIPLE
BSIS refers to a system that is installed on a truck to inform the truck driver that there may be a collision with a nearby bicycle so that the driver can take appropriate measures in time to avoid traffic accidents. The system involves two types of warning signals, information signals and warning signals.

INFORMATION SIGNAL
BSIS uses an optical information signal to inform the truck driver that there is a bicycle nearby. If the bicycle has been driving in a critical area where a collision may occur, the information signal will always remain to remind the truck driver. The information signal will only be automatically deactivated in the event of a system failure or sensor contamination. It cannot be manually deactivated and is visible during the day and night. The device that sends out the information signal should form a horizontal angle greater than 30° with the axis parallel to the longitudinal midplane of the vehicle and pass through the driver's eye reference point.

The main features of information signals are summarized as follows:
  1. Low intensity 
  2. Low annoyance if issued too often Lesser effect in steering driver‘s attention 
  3. > 30° to the right of the driver 
  4. Only automatic deactivation (ice, snow on sensors, ...) 

The diagram is as follows:


Both the truck and the bicycle are moving, and the bicycle enters a key area that may collide with the truck, but the truck driver has no intention to turn, and an information signal appears to remind.

WARNING SIGNAL
When the probability of an accident is relatively high, that is, when the system detects a potential collision. At the time, BSIS warns the driver through optical signals, acoustic signals, tactile signals or any combination of these signals. If it is an optical signal, this signal is also visible during the day and night. The warning signal is different from the information signal in the mode or start strategy. It is easy for the driver to understand and associate it with the potential danger. This warning signal can be manually or automatically deactivated. In the event of malfunction or sensor contamination, it Disabled with the information signal. The verification of the warning signal is achieved through technical document review.

The main features of warning signals are summarized as follows:
  1. High intensity 
  2. If issued right, good effects in steering driver‘s attention
  3. High annoyance if issued too often
  4. Different to information signal 
  5. Activation strategy decided by Vehicle Manufacturer 
  6. not before collision becomes imminent 

The diagram is as follows:


Trucks and bicycles are both in motion, the bicycle enters a key area that may collide with the truck, and the truck driver intends to turn. When BSIS evaluates the trajectory intersection or detects the operation of the turn indicator on the steering wheel, a warning signal appears to remind.

When the truck is stationary, if a bicycle enters the nearby area, a signal reminder will also appear, the diagram is as follows:



UN R151 SCOPE OF APPLICATION
  1. This Regulation applies to the blind spot information system of vehicles of categories N2 (> 8 t of technically permissible maximum mass) and N3. Vehicles of categories N2 (≤ 8 t of technically permissible maximum mass), M2 and M3 may be approved at the request of the manufacturer.‘
  2. The requirements of this Regulation are so worded as to apply to vehicles which are developed for right-hand traffic. In vehicles that are developed for left-hand traffic, these requirements shall be applied by inverting the criteria, when appropriate.
UN R151 TEST ITEMS
No.Test itemsRemark
1Dynamic test
Truck: 0-30km/h
Bicycle: 5 km/h -20 km/h
Cyclist Dummy: Reference to ISO [CD] 19206-4
Only test information signals, no warning signals
2
Static test
Truck: standstill
Bcycle: 5 km/h -20 km/h driving parallel and perpendicular to the truck respectively
Cyclist Dummy: Reference to ISO [CD] 19206-4
Only test information signals, no warning signals
3
Automatic deactivation testBSIS is automatically deactivated after ice, snow, mud or other pollution, and automatically restarted after the pollution is eliminated
4Failure detection testSignal reminder when BSIS is not available
5Optical failure warning signals verification test
Information signal
Warning signal
Failure warning signals
6Electro Magnetic Compatibility (EMC)The effectiveness of the BSIS shall not be adversely affected by magnetic or electrical fields and meet the requirements of R10.04

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UN R151 CERTIFICATION PLEASE CONTACT

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Emily Shui
Global Vehicle Regulation Research Department
Master's degree from Chongqing University of Technology, specializing in cross-disciplinary compliance and certification solutions for automotive electronics
Phone: +86 18875016631
Mail: emily.shui@atic-cn.com