Performance requirements and test methods for lane keeping assist system of commercial vehicles
1 Scope
This standard specifies the terms and definitions, technical requirements and test methods of lane keeping assist system of commercial vehicles
This document applies to categories M2, M3 and N vehicles equipped with lane keeping assist system which has lane departure prevention function (hereinafter referred to as "system").
2 Normative references
The following documents contain provisions which, through reference in this text, constitute indispensable provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition (including any amendments) applies.
GB/T 3730.2-1996 Road vehicle - Masses - Vocabulary and codes
GB 5768 (all parts) Road traffic signs and markings
GB 34660 Road vehicles - Requirements and test methods of electromagnetic compatibility
GB/T 39263-2020 Road vehicles - Advanced driver assistance systems - Terms and definitions
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 39263-2020 and the following apply.
3.1
lane keeping assist; LKA
monitor the relative position between the vehicle and the lane line in real time, and control the lateral movement of the vehicle continuously or if necessary, so as to keep the vehicle running in the original lane
3.2
Lane departure prevention; LDP
monitor the relative position between the vehicle and the lane boundary in real time, control the lateral movement of the vehicle when the vehicle departs from the lane, so as to assist the driver keeping the vehicle running in the original lane
3.3
lane departure warning; LDW
monitor the status of the vehicle running in the lane in real time, and send out warning when the vehicle has or is going to have lane departure without driving intention
3.4
subject vehicle
vehicle under test equipped with LKA (3.1) system which is with LDP (3.2) function defining in this document
3.5
lane
area of roadway that a vehicle is expected to run along in the absence of any obstruction without the driver's desire to change the path of travel
3.6
visible lane marking
markings intentionally made on the lane boundary (3.7) and are directly visible by the driver while driving
3.7
lane boundary
boundaries, determined by the visible lane markings (3.6), is the outer edge of the lane line
3.8
rate of departure
vd
perpendicular component of velocity of the subject vehicle (3.4) approaching to the lane boundary (3.7)
Note: the unit is m/s.
3.9
warning threshold
early warning trigger point in the system corresponding to the position of the vehicle on the road when an early warning is issued
3.10
intervention threshold
intervention trigger point in the system corresponding to the position of the vehicle on the road when an intervention is operated
3.11
failure
failure of system performance or function due to mechanical or electronic problems
4 Symbols
For the purposes of this document, the following symbols apply.
Dmax: The maximum value that the outer edge of the front vehicle tire is allowed to cross the lane boundary on the departure side, in m.
vmax: The maximum velocity at which the system activation condition is met, in m/s.
vmin: The minimum vehicle velocity at which the system activation condition is met, in m/s.
v: The test velocity, in m/s;
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols
Annex A (Informative) Functional safety requirements
Bibliography
