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
汽车全景影像监测系统性能要求及试验方法
1 范围
本文件规定了汽车静止及低速行驶状态下的全景影像监测系统的一般要求和性能要求，描述了试验方法。
本文件适用于安装有全景影像监测系统的M类和N类非铰接式车辆，其他车辆类型参照执行。
2 规范性引用文件
下列文件中的内容通过文中的规范性引用而构成本文件必不可少的条款。其中，注日期的引用文件，仅该日期对应的版本适用于本文件；不注日期的引用文件，其最新版本(包括所有的修改单)适用于本文件。
GB 34660 道路车辆电磁兼容性要求和试验方法
GB/T 39263 道路车辆先进驾驶辅助系统(ADAS) 术语及定义
3 术语和定义
GB/T 39263界定的以及下列术语和定义适用于本文件。
3.1
全景影像监测系统 around view monitoring system; AVMS
向驾驶员提供车辆周围360°范围内环境的实时影像信息的系统。
3.2
系统盲区 blind spot of AVMS
因摄像头布置和车身结构限制等原因，AVMS无法监测到的车辆周边区域。
3.3
单视图 single view image
对某一路摄像头采集的图像进行单独显示的视图。
注：单视图一般分为前单视图、后单视图、左单视图和右单视图。
3.4
平面拼接视图 splicing view plane
将各路摄像头采集的图像处理得到的一幅显示车辆周边环境信息的平面视图。
3.5
拼接缝隙 splicing gap
在平面拼接视图(3.4)中，相邻摄像头采集的图像在拼接后产生的图像缝隙。
注：见图1。
3.6
拼接错位 splicing dislocation
在平面拼接视图(3.4)中，相邻摄像头采集的图像在拼接后图像显示位置的偏移。
注：见图2。
3.7
拼接重影 splicing ghosting
在平面拼接视图(3.4)中，相邻摄像头采集的图像在拼接后图像的叠加显示。
注：见图3。
3.8
拼接损失 splicing loss
在平面拼接视图(3.4)中，相邻摄像头采集的图像在拼接后图像的部分丢失。
4 一般要求
4.1 功能
4.1.1 车辆在启动状态下，应至少在进入倒车挡位时在显示屏中立即清晰地显示车辆周围环境的实时影像信息。
4.1.2 AVMS应能输出平面拼接视图，且应满足以下要求：
a) M类、N₁类车辆的AVMS支持360°范围内视图的拼接；
b) N₂类、N₃类车辆的AVMS至少支持如图5所示的270°范围内视图的拼接，且为新增摄像头留有接口，以补充后部视野显示。
4.1.3 平面拼接视图中，车辆模型应车头竖直朝上布置，宜水平居中，不应出现明显的偏移或倾斜，垂直方向可有适当的偏移。
4.1.4 AVMS应具备输出单视图的功能，并满足以下要求：
a) M类、N₁类车辆显示前单视图、后单视图、左单视图和右单视图；
b) N₂类、N₃类车辆至少显示前单视图、左单视图和右单视图。
4.2 自检
AVMS应在上电后进行自检且至少具备以下自检功能：
a) 检查相关电气部件是否正常运行；
b) 检查相关传感元件是否正常运行。
4.3 故障指示
AVMS应至少以光学信号的方式提示驾驶员AVMS故障，该故障信号可与其他系统共用文字、图形或位置。
4.4 电磁兼容
AVMS电磁兼容性应符合GB 34660的要求。
