GB/T 37471-2019Intelligent transportation systems - Lane change decision aid systems - Performance requirements and test procedures (English PDF)

4.1 Classification by coverage zone

4.1.1 Classification basis

LCDAS is classified according to the minimum limit of the required coverage range, as shown in Table 1.

4.1.2 Type I system

Type I system only provides blind spot warning function. This type of system reminds the driver to pay attention to the target vehicle in the adjacent zone.

Such systems do not require warnings for target vehicles closing the target vehicle from the rear zone.

4.1.4 Type III system

Type III system provides blind spot warning function and closing vehicle warning function. The purpose of this type of system is to remind the driver to pay attention to the target vehicle in the adjacent zone and the target vehicle closing the vehicle from behind.

4.2 Classification by the closing speed of the target vehicle

4.2.1 Classification basis

Type II and Type III LCDAS are classified by the maximum closing speed and minimum curve radius of the target vehicle, as shown in Table 2.

4.2.3 Category B system

For a given category B system, the minimum performance range required by the radius of the curve and the closing speed of the target vehicle is as shown in Figure 8.This type of system has the ability to work on smaller curve radius conditions.

For a given category C system, the minimum performance range required by the radius of the curve and the closing speed of the target vehicle is as shown in Figure 9.This type of system has the ability to work on smaller curve radius conditions.

4.3 Other requirements

The following content shall be declared in the accompanying document.

5.1 LCDAS functional requirements

5.1.1 Inactive working state and basic functions

LCDAS will not provide any warning to the driver when it is inactive. The system in the inactive state can enter the standby mode. At this time, the system can still monitor the target vehicle. Because it is in the inactive state, it will not provide any warning to the driver. The system in the inactive state can also be turned off directly without entering the standby mode.

5.1.3 Active working state and basic functions

5.1.3.1 No-warning state

The non-warning state means that the system is working; the system shall be able to automatically detect the target vehicle; meanwhile the warning conditions are not met.

5.1.3.2 Warning state

The warning state is that the system is working; the system shall be able to automatically detect the target vehicle and meet the warning conditions.

5.2 Performance requirements

5.2.1 Location description of warning requirements

In order to describe the blind spot warning requirements and closing vehicle warning requirements, it respectively defines several straight-lines, left adjacent zone, right adjacent zone, left rear zone, right rear zone. The lane markings in the Figure are for reference only for illustration, as shown in Figure 10.

Description.

5.2.3.2 Suppression of blind spot warning

In the case of the subject vehicle overtaking the target vehicle, if the target vehicle enters the adjacent zone from the front of the subject vehicle at this time, the blind spot warning can have a warning suppression for up to 2 s after the warning condition is met for the first time; during the warning suppression period, it does not provide the blind spot warning as caused by this target vehicle to the driver. This function is optional.

5.2.4 Requirements for closing vehicle warning function

5.2.6 System response time

The response time of the entire system, from the time the target meets the warning requirements to the effective warning indication, shall not exceed 300 ms.

5.3 User interface

5.3.2 LCDAS active state indication

The LCDAS active state indicator can be used to tell the driver of the subject vehicle that LCDAS is in working state (see 5.1). If the driver can activate or deactivate the system manually, the system shall contain both the system inactive state indicator and the active state indicator. The device that activates the system is a switch, so that the driver can activate or deactivate the system manually.

5.3.4 LCDAS fault indication

When LCDAS detects a system fault through the self-check function (see 5.4), the system shall notify the driver through the fault indication function.

The LCDAS fault indication shall clearly indicate the failure of the driver's system by means of vision, hearing or a combination of vision and hearing.

5.4 Self-check requirements of subject vehicle

After the system is activated, the system shall at least provide the following self-check functions.

6.1 Requirements for target vehicles for testing

For the test in this standard, the target vehicle used for the test shall be a manned motorcycle. The target vehicle shall meet the following size requirements.

6.2 Environmental requirements

The environmental requirements are as follows.

6.3 Requirements for blind spot warning test

6.3.1 Blind spot warning test system

6.3.1.1 The test system meets the following conditions.

6.3.1.2 For all test processes, the test measurement system has the following

accuracy.

6.3.2.3 False warning test

The purpose of this test is to detect that the blind spot warning system does not issue a warning when the test target vehicle is in a lane outside the adjacent lane.

6.3.2.4 Lateral movement of target vehicle

For the false warning test of the target vehicle's lateral movement, the definition of the straight-line is as shown in Figure 13 and 5.2.1.The test provisions and test requirements are as follows.

6.4 Requirements for closing vehicle warning test

6.4.1 Closing vehicle warning test system

6.4.1.1 The test system shall meet the following conditions.

6.5.2.2 Subject vehicle overtaking target vehicle

The purpose of this test is to detect when the subject vehicle overtakes the target vehicle, the lane change warning system gives the required warning. This test shall be carried out in accordance with 6.3.2.2.

6.5.2.3 False warning test

The purpose of this test is to detect when the target vehicle is located in a lane outside the adjacent lane, the closing vehicle warning system does not give any warning.

6.5.2.4 Lateral movement of target vehicle

The purpose of this detection is to detect that when the target vehicle moves laterally near the subject vehicle, the lane change warning system gives the required warning. The definition of the straight-line is as shown in Figure 17 and 5.2.1.The test shall be carried out as follows.