Overview
With the vigorous development of the automobile industry, intelligentization has become an important trend in the development of the current automotive industry, and the in-vehicle infotainment system is becoming an important part of automotive intelligence. While providing consumers with more advanced comfort, entertainment and information, the in-vehicle infotainment system as a vehicle's high value-added electronic products account for a larger proportion of the car, and the integrated functions are Simple audio equipment, CD equipment, and radio equipment have gradually expanded into multimedia information interaction devices that integrate video entertainment, car navigation, and wireless communication. As an important node of vehicle electrical and network, in-vehicle infotainment system plays an important role in displaying and feedbacking vehicle status and information.
Figure 1 Overview of infotainment system features
Test demand
In-vehicle infotainment equipment provides drivers with the most intuitive vehicle comfort, entertainment and quality. However, due to the limitations of testing techniques, means and conditions, the in-vehicle infotainment system still has many problems in its functions and performance compared with other traditional electronic control units, such as: pop-up of audio playback, sluggish response of touch screen, and display error of interactive interface. The problems of low navigation and positioning accuracy and accurate speech recognition all restrict the quality improvement of information entertainment and the user experience.
Therefore, functional and performance levels must be tested for each function during the product development phase. The functions of the infotainment system involve the integration of human-computer interaction, audio and video signals, wireless signals, hard-wire signals and bus signals. Therefore, the test requirements under laboratory conditions are extensive and complex. The following figure shows the basic test requirements for the functions and performance of the in-vehicle infotainment system.
Figure 2 infotainment system test requirements
Figure 2 lists several infotainment system test contents such as:
1) For human-computer interaction, there are both screen flow and character recognition functional tests, as well as image brightness, chrominance, signal-to-noise ratio and other performance levels;
2) For the audio system, there are audio output function verification, audio performance, and power amplifier performance tests;
3) Data reading and writing, device identification, charging current, etc. for USB functions;
4) For the radio system, there are FM/AM receiving function test, and FM/AM frequency modulation performance test;
5) Tests for navigation systems include positioning accuracy, positioning time, and ability to collect stars;
6) Mobile phone interconnection function test for Bluetooth function, including test of transmission and reception performance.
In summary, the information entertainment system testing needs are wide-ranging, complex and diverse, and the testing is time-consuming and labor-intensive. In the face of such testing challenges, traditional testing is inefficient, time-consuming and labor-intensive, and can no longer meet the needs of modern automated testing. A comprehensive software and hardware platform with comprehensive testing capabilities to solve the test challenges of the in-vehicle infotainment system on the road of quality improvement.
2. Solution
Beijing Jingwei Hengrun Technology is an in-vehicle entertainment information test system based on machine vision, robot and hardware-in-the-loop simulation technology. It is used for testing automotive functions and performance projects. It uses test systems to simulate the wired and wireless signals required for in-car entertainment systems. To achieve the purpose of simulating the real use environment of the car entertainment system in the laboratory environment. The test equipment can also simulate various operational control signals (including touch screen, remote control, buttons and voice) of the in-vehicle entertainment system, automatically execute test scripts for various functions and performances, and automatically generate test reports.
Figure 3 information entertainment test system solution
As shown in the figure above, the test system provides a closed-loop test environment for in-vehicle infotainment systems:
1) Input signal simulation
a) Hard line signal simulation
b) bus signal simulation
c) touch operation simulation
d) voice signal simulation
e) RF signal simulation
2) Output signal acquisition and testing
a) Hard line signal acquisition
b) bus signal analysis
c) image signal feature extraction
d) audio signal analysis
e) RF signal reception and analysis
The simulation and simulation of the working environment of the vehicle multimedia device are realized. The system realizes the automatic test environment in the laboratory condition by providing robot touch and image acquisition, instead of manually operating and observing the information entertainment system. The development and performance testing of the functionality of the entertainment system provides advantageous support and means.
2.1. Touch operation simulation
The system integrates 6-degree-of-freedom industrial robots, and users can complete various touch operation settings for in-vehicle infotainment devices without programming, such as mechanical buttons, knobs, touch screens, double-clicks, drag and so on. It also includes a variety of parameter configurations, which can set the number of touches, contact time, rotation angle, and so on.
Figure 4 robot touch simulation
2.2. Interface image recognition
The system replaces the human eye recognition function based on machine vision. The software can effectively identify the graphic symbols, character numbers, pointers, color brightness, etc. of the infotainment system display interface through image acquisition and analysis functions, and realize the flow of information and information on human-computer interaction. Tests for display, feature determination, etc. are required.
As shown in the figure below, the system captures the image to be tested to obtain image information, and acquires image feature information such as “101.9†and “fast forward arrow†in the expected area as the judgment basis.
Figure 5 image feature recognition
2.3. Conventional Signal Simulation and Acquisition
The system is based on hardware-in-the-loop technology, which can simulate and collect various types of sensors, actuator signals, network virtual nodes, etc. based on hard lines and buses, and constitute the virtual vehicle environment required by the controller to be tested, without having to be in a real car or On the prototype. This kind of test is systematic, safe and reliable, even if the test exceeds the limit conditions, it will not cause any damage, and it is easy to reproduce the error of the controller to be tested. Simplifies the testing process and improves the efficiency of testing.
Figure 6 hardware in-loop test
2.4. RF signal simulation and analysis
This system is specially designed for the new requirements of information-based entertainment systems based on radio frequency functions (such as broadcasting, navigation, communication, etc.). PXI RF signal generation and analysis boards based on PXI platform can easily and flexibly implement on-board Bluetooh. Simulation and analysis of wireless radio frequency signals such as GPS, FM/AM, 2G/3G/4G, Wifi, etc., to meet the test requirements of the following performance parameters:
Figure 7 RF signal test
1) FM/AM broadcast test indicators
2) Navigation signal test indicators
3) Bluetooth signal test indicators
4) Network communication signal test indicators
5) WIFI signal test indicators
3. Automatic testing
The system has the function of supporting automatic measurement. The upper computer can control all the functions of the test equipment by running the automation program; the design, writing and management of the test flow can be realized by dragging and dropping the action instructions, through the link with other software. Automate the operation and management of the test process; graphical editing of test cases. Can provide testers with the following conveniences:
1) Drag and drop development mode to avoid programming troubles;
2) Arbitrarily configure test cases and quantities as needed;
3) Manage large test projects, data and results;
4) Support complex regression testing to improve testing efficiency;
5) Automatically generate test reports for easy recording and analysis of test results;
6) Free testers to improve test efficiency and quality.
Figure 8 automatic test sequence run
Figure 9 automatically generates a test report
4. End
Hengrun car entertainment information test system consists of upper computer system and software, signal simulation and analysis system, robot arm and machine vision interaction system. Based on hardware-in-the-loop simulation technology, the simulation of closed-loop simulation signal of vehicle entertainment system is realized. With machine vision-based image processing, human-computer interaction and feedback are realized, which effectively saves costs and shortens the development cycle for users during the product development phase.
The test solution can simulate the closed-loop environment of the vehicle information system under laboratory conditions, and has the advantages of flexible, multi-degree-of-freedom robot touch operation and modular RF signal vector simulation and analysis, and has high equipment reliability and good integration. Easy to use and configure for easy maintenance and expansion. At the same time, powerful test automation capabilities can greatly improve test quality and efficiency.
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