BRIEF ANALYSIS OF UNECE APROVAL OF UN R79 ACSF C

BRIEF ANALYSIS OF UNECE APROVAL OF UN R79 ACSF C

RELEASE DATE:2021-08-04 17:01
Brief: With the popularity of assisted driving systems, ACSF C as a leading-edge lane change assistance function is becoming an option on an increasing number of vehicles on sale. According to the UN R79 regulation, vehicles equipped with ACSF C need to comply with the R79 regulation and complete type approval to enter the EU market.


TEST REQUIREMENTS OF ACSF C
Annotation: Vsmin means the minimum speed down to which an ACSF is designed to operate. Vsmax means the maximum speed up to which an ACSF is designed to operate. If not specified otherwise all vehicle test speeds shall be based on Vapp = 130 km/h.

Test
Test Requirements
Test Pass Conditions
Lane Change Functional Test
(1) The test vehicle shall be driven in a lane of a straight test track, which has at least two lanes in the same direction of travel, with road markings on each side of the lanes. 
(2) The ACSF of Category C shall be activated, another vehicle shall approach from the rear, the approaching vehicle shall then pass the vehicle under test entirely. 
(3) A lane change into the adjacent lane shall then be initiated by the driver. 
(4) The vehicle speed shall be: Vsmin + 10km/h.
(a) The lateral movement towards the marking does not start earlier than 1 second after the lane change procedure was initiated. 
(b) The lateral movement to approach the lane marking and the lateral movement necessary to complete the lane change manoeuvre are completed as one continuous movement. 
(c) The recorded lateral acceleration does not exceed 1 m/s2. 
(d) The moving average over half a second of the lateral jerk does not exceed 5 m/s3. 
(e) The lane change manoeuver is completed in less than 5 seconds for M1. 
(f) ACSF of Category B1 automatically resumes after the lane change manoeuvre is completed. 
(g) The direction indicator is deactivated not before the end of the lane change manoeuvre and no later than 0.5 seconds after ACSF of Category B1 has resumed.
Minimum Activation Speed Test
(1) The test vehicle shall be driven in a lane of a straight test track, which has at least two lanes in the same direction of travel, with road markings on each side of the lanes. 
(2) The vehicle speed shall be: Vsmin - 10km/h. Another vehicle shall approach from the rear, the approaching vehicle shall then pass the vehicle under test entirely.
(3) A lane change into the adjacent lane shall then be initiated by the driver.
The lane change manoeuvre is not performed.
Overriding Test
(1) The test vehicle shall be driven in a lane of a straight test track, which has at least two lanes in the same direction of travel, with road markings on each side of the lanes. 
(2) The vehicle speed shall be: Vsmin +10km/h. 
(3) A lane change into the adjacent lane shall then be initiated by the driver. The steering control shall be firmly controlled by the driver to maintain the vehicle in the straight direction.
The measured overriding force does not exceed 50 N.
Lane Change Procedure Suppression Test
(1) The test vehicle shall be driven in a lane of a straight test track, which has at least two lanes in the same direction of travel, with road markings on each side of the lanes. 
(2) The vehicle speed shall be: Vsmin +10km/h. 
(3) The ACSF of Category C shall be activated.Another vehicle shall approach from the rear, the approaching vehicle shall then pass the vehicle under test entirely. A lane change into the adjacent lane shall then be initiated by the driver.
The requirements of the test are fulfilled if the lane change procedure is suppressed, for each of the test cases below: 
(a) The system is overridden by the driver; 
(b) The system is switched off by the driver;
(c) The vehicle speed is reduced to: Vsmin-10 km/h; 
(d) The driver has removed his hands from the steering control; 
(e) The direction indicator lamps are manually deactivated by the driver; 
(f) The lane change manoeuvre has not commenced within 5.0 seconds following the initiation of the lane change procedure. (e.g. another vehicle is driving in the adjacent lane in a critical situation).
Sensor Performance Test
(1) The test vehicle shall be driven in a lane of a straight test track, which has at least two lanes in the same direction of travel, with road markings on each side of the lanes.
(2) The vehicle speed shall be: Vsmin +10km/h. 
(3) Another vehicle shall approach from the rear on the adjacent lane, with a speed of 120 km/h. 
(4) The approaching vehicle shall be a type approved high volume series production motorcycle of category L3 with an engine capacity not exceeding 600 cm3 without front fairing or windshield and shall aim to drive in the middle of the lane. 
(5) The distance between the rear end of the test vehicle and the front end of the approaching vehicle shall be measured.
The system detects the approaching vehicle no later than at the distance declared by the vehicle manufacturer (Srear).
Sensor Blindness Test
(1) The test vehicle shall be driven in a lane of a straight test track, which has at least two lanes in the same direction of travel, with road markings on each side of the lanes. 
(2) The vehicle speed shall be: Vsmin +10km/h. 
(3) The rear sensor(s) shall be made blind, with means agreed between the vehicle manufacturer and the Technical Service. 
(4) The ACSF of Category C shall be activated. Another vehicle shall approach from the rear, the approaching vehicle shall then pass the vehicle under test entirely. A lane change into the adjacent lane shall then be initiated by the driver.
The system detects the sensor blindness, provides a warning to the driver and is prevented from performing the lane change manoeuvre.
Engine Start/Run Cycle Test
The test vehicle shall be driven in a lane of a straight test track, which has at least two lanes in the same direction of travel, with road markings on each side of the lanes. The vehicle speed shall be: Vsmin +10km/h.
Phase 1- Default-off test: Following a new engine start /run cycle performed by the driver, the test vehicle shall be driven in a lane of a straight test track. The ACSF of Category C shall not be activated and another vehicle shall approach from the rear and the approaching vehicle shall pass the vehicle entirely. A lane change into the adjacent lane shall then be initiated by the driver.
The lane change manoeuvre is not initiated.
Phase 2: The objective of the test is to check that the lane change manoeuvre is prevented if the system has not detected any moving object at a distance equal or greater than the distance Srear. Following a new engine start / run cycle performed by the driver, the test vehicle shall be driven in a lane of a straight test track. The ACSF of Category C shall be manually activated. A lane change procedure shall then be initiated by the driver.
The lane change manoeuvre is not started.
Phase 3 - Lane change enabling conditions test: The objective of the test is to check that the lane change manoeuvre is only possible once the system has detected a moving object at a distance equal or greater than the distance Srear. Following the completion of the test phase 2, another vehicle shall approach from the rear on the adjacent lane in order to enable the system. The distance between the rear end of the test vehicle and the front end of the approaching vehicle shall be measured. And the value when the system detects the approaching vehicle be recorded. After the rear coming vehicle has entirely passed the vehicle under test, a lane change procedure shall be initiated by the driver.
(a) The lane change manoeuver is executed; 
(b) The approaching vehicle is detected no later than at the distance declared by the vehicle manufacturer (Srear).

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Bruce got his master's degree from Nanjing University of Technology, he is now an expert in whole vehicle performance testing, certification and regulation research for global vehicle homologation.
Bruce Chen
Regulatory Researcher
Master's degree from Nanjing University of Technology, specializing in whole vehicle performance testing and certification solutions for global whole vehicle type approval.
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Email: bruce.chen@atic-cn.com