BS ISO 22735:2021 pdf download – Road vehicles — Test method to evaluate the performance of lane-keeping assistance systems
6.4 Environmental conditions
Conduct tests in dry conditions with ambient temperature above 5 °C and below 40 °C.
For some proving ground where the low limit of ambient temperature of 5 °C is difficult to achieve,lower value can be adopted. However, in that case, the lower limit values shall be reported.
No precipitation shall be falling and horizontal visibility at ground level shall be greater than 1 km.
Wind speeds shall be below 10 m/s to minimize VUT disturbance.
Natural ambient illumination shall be homogenous in the test area and in excess of 2 000 lx for daylight testing with no strong shadows cast across the test area other than those caused by the VUT. Ensure testing is not performed driving towards, or away from the sun when there is direct sunlight.
Measure and record the following parameters preferably at the commencement of every single test or at least every 30 min:
— ambient temperature in °C;
— wind speed and direction in m/s;
— ambient illumination in lx.
6.5 Test vehicle
6.5.1 General condition
The test vehicle condition shall be in accordance with the vehicle manufacturer specifications,particularly with respect to the wheel alignments, power train (e.g. differentials and locks)
configuration and tyre fitment.
6.5.2 LKAS settings
If different settings are available, the chosen setting shall be kept during the complete test procedure.
The test procedure can be repeated for different settings if needed.
NOTE The aim of this document is to measure performance of a vehicle equipped with LKAS. It is not intended to compare performance of different vehicles, such as Euro NCAP procedure.
6.5.3 Tyres
Generally, all measurements shall be conducted with original fitment tyres mounted. If several types of tyres are available, the types of tyres shall be reported.
For a general tyre condition, new tyres shall be fitted on the test vehicle according to the manufacturer’s specifications. If not specified otherwise by the tyre manufacturer, they shall be run-in according to the tyre conditioning procedure specified in 7.1.3. After running-in maintain the run-in tyres in the same position on the vehicle for the duration of the testing Tyres shall have a tread depth of at least 90 % of the original value across the whole breadth of the tread and around the whole circumference of the tyre.
Tyres shall be manufactured not more than one year before the test. The date of manufacturing shall be noted in the presentation of test conditions. Tyres shall be inflated to the pressure as specified by the vehicle manufacturer for the test vehicle configuration. The tolerance for setting the cold inflation pressure is ±5 kPa for pressures up to 250 kPa and ±2 % for pressure above 250 kPa.
6.5.4 Wheel alignment measurement The vehicle should be subject to a vehicle (in-line) geometry check to record the wheel alignment set by the vehicle manufacturer. This should be done with “unladen kerb mass” specified in 6.5.5.
6.5.5 Loading conditions The fuel tank shall be filled up and, in the course of the measurement sequence, the indicated fuel level should not drop below “half-full”. Check the oil level and top up to its maximum level if necessary. Similarly, top up the levels of all other fluids to their maximum levels if necessary. Measure the front and rear axle masses and determine the total mass of the vehicle. Record this mass in the test details.
Calculate the required ballast mass, by subtracting the mass of the test driver and test equipment so that the test mass is the “unladen kerb mass” as specified by vehicle manufacturer plus 200 kg. The weight distribution in a ready-for-measurement condition shall be adjusted according to the axle load distribution specified by the vehicle manufacturer for a ready-to-drive (kerb) condition. If the vehicle is to be tested in any other load condition (for example, GVM) then the additional payload shall be evenly distributed such that cross-axle variations do not exceed 50 kg.
6.6 Vehicle preparation Fit the on-board test equipment and instrumentation in the vehicle. Also fit any associated cables, cabling boxes and power sources. Place weights with a mass of the ballast mass. Any items added should be securely attached to the car. With the driver in the vehicle, weigh the front and rear axle loads of the vehicle. Compare these loads with the “unladen kerb mass”.