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
汽車全景影像監測系統性能要求及試驗方法
1 范圍
本文件規定了汽車靜止及低速行駛狀態下的全景影像監測系統的一般要求和性能要求，描述了試驗方法。
本文件適用于安裝有全景影像監測系統的M類和N類非鉸接式車輛，其他車輛類型參照執行。
2 規范性引用文件
下列文件中的內容通過文中的規范性引用而構成本文件必不可少的條款。其中，注日期的引用文件，僅該日期對應的版本適用于本文件；不注日期的引用文件，其最新版本(包括所有的修改單)適用于本文件。
GB 34660 道路車輛電磁兼容性要求和試驗方法
GB/T 39263 道路車輛先進駕駛輔助系統(ADAS) 術語及定義
3 術語和定義
GB/T 39263界定的以及下列術語和定義適用于本文件。
3.1
全景影像監測系統 around view monitoring system; AVMS
向駕駛員提供車輛周圍360°范圍內環境的實時影像信息的系統。
3.2
系統盲區 blind spot of AVMS
因攝像頭布置和車身結構限制等原因，AVMS無法監測到的車輛周邊區域。
3.3
單視圖 single view image
對某一路攝像頭采集的圖像進行單獨顯示的視圖。
注：單視圖一般分為前單視圖、后單視圖、左單視圖和右單視圖。
3.4
平面拼接視圖 splicing view plane
將各路攝像頭采集的圖像處理得到的一幅顯示車輛周邊環境信息的平面視圖。
3.5
拼接縫隙 splicing gap
在平面拼接視圖(3.4)中，相鄰攝像頭采集的圖像在拼接后產生的圖像縫隙。
注：見圖1。
3.6
拼接錯位 splicing dislocation
在平面拼接視圖(3.4)中，相鄰攝像頭采集的圖像在拼接后圖像顯示位置的偏移。
注：見圖2。
3.7
拼接重影 splicing ghosting
在平面拼接視圖(3.4)中，相鄰攝像頭采集的圖像在拼接后圖像的疊加顯示。
注：見圖3。
3.8
拼接損失 splicing loss
在平面拼接視圖(3.4)中，相鄰攝像頭采集的圖像在拼接后圖像的部分丟失。
4 一般要求
4.1 功能
4.1.1 車輛在啟動狀態下，應至少在進入倒車擋位時在顯示屏中立即清晰地顯示車輛周圍環境的實時影像信息。
4.1.2 AVMS應能輸出平面拼接視圖，且應滿足以下要求：
a) M類、N?類車輛的AVMS支持360°范圍內視圖的拼接；
b) N?類、N?類車輛的AVMS至少支持如圖5所示的270°范圍內視圖的拼接，且為新增攝像頭留有接口，以補充后部視野顯示。
4.1.3 平面拼接視圖中，車輛模型應車頭豎直朝上布置，宜水平居中，不應出現明顯的偏移或傾斜，垂直方向可有適當的偏移。
4.1.4 AVMS應具備輸出單視圖的功能，并滿足以下要求：
a) M類、N?類車輛顯示前單視圖、后單視圖、左單視圖和右單視圖；
b) N?類、N?類車輛至少顯示前單視圖、左單視圖和右單視圖。
4.2 自檢
AVMS應在上電后進行自檢且至少具備以下自檢功能：
a) 檢查相關電氣部件是否正常運行；
b) 檢查相關傳感元件是否正常運行。
4.3 故障指示
AVMS應至少以光學信號的方式提示駕駛員AVMS故障，該故障信號可與其他系統共用文字、圖形或位置。
4.4 電磁兼容
AVMS電磁兼容性應符合GB 34660的要求。
