Originally known as the "moose test" the lane change maneuver was transferred to the International Standard ISO 3888-2 after a revision by the Association of the German Automotive Industry (VDA). The ISO and VDA lane-change test is used to evaluate the handling performance of a vehicle and is an integral part of the vehicle design procedures and vehicle assessment. Based on 3 cone lanes with a total length of 61 meters a double lane change is defined, which must be completed with maximum speed.
The ISO double lane change test consists of an entry and an exit lane and with a length of 12m and a side lane with a length of 11m. The width of the entry and side lane are dependent on the width of the vehicle, the width of the exit lane is constantly 3m wide. The lateral offset between entry and side lane is 1 m and the longitudinal offset is 13.5 m. For the same lateral offset the side and exit lane has a slightly shorter longitudinal displacement of 12.5m. 2m after the start of the entry lane the throttle is released so that the entire maneuver is completed in the overrun mode with the top gear and an engine speed of at least 2000 rev/min. At the end of the entry and exit lane the velocity is measured. The entry velocity is increased gradually. If no cones are overturned, the test is passed.
Points of Criticism on the Lane Change Test
The results of the ISO lane change test depend heavily on the skills of the test driver. The fact that the entire system of car and driver will be assessed in the test, it is very difficult to gain objective results of the test.
The driver influence during the ISO lane change test can be eliminated completely by running the test automatically with a track controlled vehicle. By combining the VEHICO Steering Robot CS-B with the VEHICO track controlled driving CO.TRACK the test car can drive the lane change maneuver automatically. A human influence is eliminated completely. Both the Steering Robot and the automatic track control CO.TRACK have the ability to generate the required steering angle speed and lateral acceleration, which are necessary for a high-dynamic lane change test. The driving robot drives through the cone lanes with a reproducibility which has no human driver. To show this, we drove the double lane change test with the driving robot several times at the same speed and plotted the results. It is clear to see that even in the critical areas of maximum lateral acceleration, the reproducibility is ensured with only a few centimeters of variation. For the first time it is possible to objectify the double lane change test and thus to achieve clear and unambiguous test results.
Advantages of the automatically driven ISO lane change test:
- objective test results without driver influence
- fast installation and configuration of the steering robot - ready to use for testing in about 1 hour
- no elaborate positioning of cone lanes needed
- read in sensor data over CAN bus
- all data is recorded and displayed under real-time conditions by the steering robot
- simple graphic analysis by driving robot software