Composite hollow core station post insulators with a.c. voltage greater than 1 000V and d.c. voltage greater than 1 500V - Definitions,test methods and acceptance criteria
GB/T 44179-2024 Performance requirements and testing methods for around view monitoring system of vehicles
1 Scope
This document specifies the general requirements and performance requirements of around view monitoring system of vehicles at rest and at low speed operation, and describes the testing methods.
This document is applicable to Categories M and N non-articulated vehicles equipped with around view monitoring systems, and it can be referred to by other vehicles.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB 34660 Road vehicles - Requirements and test methods of electromagnetic compatibility
GB/T 39263 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 and the following apply.
3.1
around view monitoring system; AVMS
system that provides the driver with real-time view information of the environment in a 360° range around the vehicle
3.2
blind spot of AVMS
areas around the vehicle that AVMS cannot monitoring due to camera placement and body structure limitations
3.3
single view image
a view that displays images captured by a single camera
Note: Single view image is generally divided into front single view image, rear single view image, left single view image and right single view image.
3.4
splicing view plane
a plane view showing the surrounding environment information of the vehicle, which is obtained by processing the images captured by various cameras
3.5
splicing gap
image gap generated, in the splicing view plane (3.4), after the images captured by adjacent cameras are spliced
Note: See Figure 1.
3.6
splicing dislocation
deviation of image display position, in the splicing view plane (3.4), after the images captured by adjacent cameras are spliced
Note: See Figure 2.
3.7
splicing ghosting
overlay display of images, in the splicing view plane (3.4), after the images captured by adjacent cameras are spliced
Note: See Figure 3.
3.8
splicing loss
partial loss of images, in the splicing view plane (3.4), after the images captured by adjacent cameras are spliced
4 General requirements
4.1 Function
4.1.1 When the vehicle is in starting state, the real-time image information of the surrounding environment of the vehicle should be clearly displayed in the display screen at least when it enters the reverse gear.
4.1.2 AVMS shall be able to output splicing view plane and meet the following requirements:
a) the AVMS of Categories M and N1 vehicles support splicing of views within a 360° range;
b) the AVMS of Categories N2 and N3 vehicles support at least the splicing of views within 270° range, as shown in Figure 5; and reserve an interface for the new camera to supplement the rear view display.
4.1.3 In the splicing view plane, the vehicle model shall be arranged vertically facing up, and shall be centered horizontally, without obvious deviation or tilt, and there can be appropriate deviation in the vertical direction.
4.1.4 The AVMS shall have the function of output single view image and meet the following requirements:
a) Categories M and N1 vehicles shall display front single view image, rear single view image, left single view image, and right single view image.
b) Categories N2 and N3 vehicles shall display front single view image, left single view image, and right single view image.
4.2 Self-inspection
The AVMS shall be subjected to self-inspection after power-on and have at least the following self-inspection functions:
a) inspect whether related electrical components work properly;
b) inspect whether related sensing elements work properly.
4.3 Fault indication
The AVMS shall at least notify the driver of AVMS failure in the form of an optical signal that can share text, graphics, or location with other systems.
4.4 Electromagnetic compatibility
The electromagnetic compatibility of AVMS shall meet the requirements of GB 34660.
Contents Foreword 1 Scope 2 Normative references 3 Terms and definitions 4 General requirements 5 Performance requirements 6 Testing methods
