Development and design of driving recorder scheme

Vehicle driving recorders (hereinafter referred to as recorders) have been widely used in my country, and their functions of restraining drivers' illegal driving behaviors and recording the driving process of vehicles have also initially appeared. With the rapid development of modern science and technology, the product technology of the recorder is also updated rapidly, and some cutting-edge technologies have begun to be expanded and applied to the recorder.

1. The purpose of driving recorder

1. It is helpful for drivers to drive safely

Safeguard the legitimate rights and interests of drivers. For pedestrians crossing the road, cyclists and motorcycles, if they have a scratch with them, they may be extorted. If there is a driving recorder, the driver can provide himself with effective evidence. By replaying the surveillance video records, the responsibility for the accident is clear at a glance, and the traffic police can handle the accident quickly and accurately; it can quickly evacuate the scene to restore traffic, and retain effective evidence at the time of the accident, creating a safe and smooth traffic environment. In the case of professional robbery and road robbery, the driving recorder will be able to provide decisive evidence to solve the case: the scene of the accident and the appearance of the criminal.

2. Beneficial to traffic law enforcement departments

The continuous increase in the number of motor vehicles has brought great convenience to people's travel, but it has also brought many traffic violations. It is far from enough to rely solely on the supervision of traffic management departments for these traffic violations. After all, the financial resources of the traffic control department And manpower is limited. At present, Shenzhen has launched a reward report for road traffic violations, so that everyone can be a traffic policeman, which can restrain drivers to a large extent, reduce the occurrence of traffic accidents, and thus achieve safe driving. However, to report traffic violations, you need to provide corresponding pictures or videos as evidence. If the driver uses a mobile phone to take pictures while driving, it will more or less affect the driving of the vehicle. In addition, with the advent of the era of big data, the driving recorder can be used as a sensor to obtain road information, and real-time access to road congestion or road roughness at specific locations.

2. The technology used in the driving recorder solution

1. Satellite positioning technology

The basic principle of satellite positioning is to use the instantaneous position of the high-speed moving satellite as the known starting data, and use the method of space distance resection to determine the position of the point to be measured (Figure 1). Using this technology, after the vehicle is installed with a satellite positioning terminal, the location can be used as the point to be measured, and the coordinate information representing the location can be obtained. During the application process of the recorder, due to the needs of the transportation department and operating companies for the management of vehicle driving positions, recorder products with satellite positioning functions have gradually appeared and are installed and used in some areas of our country. At present, the GPS terminal receivers used on the recorders in our country all adopt the support module of the Global Positioning System (GPS) of the United States.

The technical advantages of the recorder with added satellite positioning function: First, the data recording range of the recorder has been expanded. Through the analysis and playback of the position data, the driving track of the vehicle can be analyzed, combined with other recorded data, the driving process of the vehicle can be reproduced intuitively. The second is to use the characteristics of real-time update of positioning information to check the real-time time and other parameters of the recorder in real time, and adjust it in a timely manner on the basis of authorization, which relatively reduces the management cost. The third is to use the GPS signal to analyze the vehicle speed, which can be used as a supplement to the speed signal of the recorder sensor.

At the same time, there are some shortcomings in the application of the satellite positioning function. First, the positioning signal is susceptible to interference, and the GPS signal is prone to distortion or mutation, which needs to be selected and processed. Based on this, the GPS signal cannot be directly used as the basis for judging speeding and fatigue driving. The second is to reduce the host anti-interference ability. In order to ensure the reception effect, the satellite signal receiving antennas in use are all external, connected to the host through wires, which increases the interference transmission path, and anti-interference measures must be considered in hardware design.

2. Mobile communication technology

Based on the needs of real-time monitoring, most recorders with satellite positioning functions are equipped with wireless communication functions based on mobile communication networks such as GPRS or CDMA. The current mainstream form is through GPRS communication. The recorder with satellite positioning and mobile communication functions can communicate with the vehicle control center in real time. On the one hand, through data exchange, the control center can realize the monitoring and scheduling of vehicles; on the other hand, through the reading and analysis of the recorder data , the control center can monitor the driver's driving behavior in real time.

The limitations of data transmission through mobile communication technology are mainly limited by the communication bandwidth, and the communication efficiency is low. It is mostly used for the transmission of small-capacity data (such as vehicle location, speeding, fatigue driving information, etc.), and users need to bear certain communication costs. .

3. Wireless LAN communication technology

With the development of wireless local area network technology, wireless communication technology based on 802.11 communication protocol began to be applied to the recorder. Through the wireless local area network communication module, the recorder communicates with the wireless base station for data communication, and then transmits through the Internet network. The superior competent department can quickly obtain the vehicle driving data.

The technical advantage of the recorder with wireless LAN communication function lies in the convenience of data collection. Generally, the base station can complete the data collection of the recorder within 5 seconds. At the same time, except for the terminal and base station construction costs, no other communication costs are generated, and the use cost is low. Restricted by technical conditions such as communication standards, the current recorder products using wireless LAN communication technology do not meet the conditions for wide-scale application, and are mainly used in the army and some small and medium-sized transportation companies. In the follow-up link, technical guarantees such as its anti-interference ability and communication data security will be the focus of the manufacturer's development and user use.

3. Functions of the smart driving recorder solution

The smart driving recorder mainly has the following functional features: road data acquisition, intelligent violation detection, network function, and voice recognition.

During the driving process of the vehicle, the driving recorder is always waiting for the input of the voice command. When encountering a specific voice such as "taking a picture", save the data of the current camera to a local folder, or when encountering a specific voice such as "camera", the camera will enable the camera function until it encounters "stop recording" voice command, and then save the video data within this period of time to the local folder. This function is not only used for shooting illegal vehicles, but also for driving scenery. Whenever the picture is saved, in order to reduce the burden of artificially identifying the image on the server side, the driving recorder can perform pre-license plate recognition or violation detection on the picture after the picture is taken. According to the requirements of the traffic control department, for example, if the license plate cannot be recognized in the captured picture, or there is no illegal act, there is no need to upload it to the server. The second is to obtain the road smoothness and street location information during the driving process of the car. The driving recorder is used as a data acquisition device to collect the road surface information and street location information during the driving process and upload them to the server. The algorithm obtains the road surface roughness of the corresponding road section.

1. Acquisition of road data

The roughness of the road surface can reflect the driving satisfaction of the driver and the safety of the road. The detection of road surface roughness can provide information on the quality of road construction, and provide an objective index of quality rating for road construction. In order to be able to grasp the road surface roughness information of each road section in time, corresponding sensors can be installed on the motor vehicle, so that the road surface roughness data can be sent to the server at all times during the driving process of the vehicle. The detection of road surface roughness can provide important information for the maintenance department, so that they can make optimal decisions for road surface repair, maintenance and renovation, and can detect damaged road sections in time and repair them in time, thereby reducing traffic congestion.

2. Intelligent violation detection function

With the rapid increase in the number of motor vehicles, the pictures taken by the driving recorder will also increase accordingly. If all these pictures are uploaded to the traffic management department and allowed to be manually distinguished, this will inevitably make the traffic management department invest a lot of manpower. After all, according to the current policy of capturing traffic violations by citizens in Shenzhen and Nanjing, the pictures taken by many citizens do not meet the requirements, because if the pictures can be used as evidence of traffic violations, at least clear license plates and illegal images are required. Therefore, on the device side of the driving recorder, the pictures can be pre-identified first, and the pictures that do not meet the requirements can be filtered out, which will undoubtedly reduce a lot of unnecessary work for the traffic control department.

3. Real-time networking function

The violation pictures taken by the driver and passed the pre-identification of the driving recorder system need to be sent to the server for use by the traffic control department. Road roughness information, including GPS positioning data and gravity acceleration sensor data, also needs to be sent to the server for processing in real time, so that relevant departments can timely grasp the road surface roughness of the corresponding road section, so as to make adequate repair preparations.

4. Speech recognition

If the driver finds a vehicle that violates traffic rules in front of him during driving, he can issue commands to the driving recorder through voice to control the driving recorder to take pictures or video. This prevents the driver from using physical buttons or mobile phones to take pictures, ensuring driving safety to a certain extent.

Interacting with a machine by voice, so that the machine can understand what you say, is something that people have long dreamed of. With the advent of the era of artificial intelligence, speech recognition technology has made significant progress, gradually moving from the laboratory to the market. This design requires the use of voice recognition to control how the dashcam camera works. There are roughly two speech recognition methods that can be used at present, one is to use the speech recognition service of a well-known domestic website, and the other is to use a speech recognition chip to realize speech recognition locally.

4. Development trend of driving recorder

The development of modern science and technology has been gradually reflected in the field of traffic safety, and the recorder as a representative is a typical example of technology application. With the in-depth development of the recorder application work, the future recorder application technology will develop simultaneously in two directions of unification and diversification.

1. The basic functions and usage methods will be gradually unified: as a supervision and law enforcement product, the driving recorder is based on basic functions such as driving data recording and accident suspicious point recording. In order to realize unified supervision of drivers' driving behaviors and curb fatigue driving, speeding and other illegal driving behaviors In order to achieve the goal, the use method must be unified in the basic links such as driver login, equipment operation, and data collection and analysis. With the gradual maturity of the application technology of the recorder, the product standard of the recorder will be further revised on the existing basis. The first is to improve the data communication protocol, which is convenient for the unified collection and analysis of recorder data, and establishes a communication foundation for the establishment of a data management platform. The second is to unify the product structure form, and make unified requirements on technical methods such as display, button operation, and driver identification, so as to facilitate the unified use of recorders. The third is to make basic regulations on the functional content and technical conditions of the most widely used satellite positioning and mobile communication technologies at present, and to expand the basic functions of products.

2. The application technology of expanding functions is in a diversified trend: while ensuring the relative unity of basic functions, manufacturers will continue to expand new application technologies in the recorder according to customer needs, so as to increase product technical content and market selling points. In the future, wireless local area network and CAN-Bus technology will continue to be applied in a certain range, and when the standard and technical conditions are mature, the application range will be gradually expanded. At the same time, with the development of communication, electronics and other technologies and the reduction of equipment costs, the application of modern advanced technologies such as Bluetooth, 3G mobile communication, and fingerprint identification on recorders will become possible, and the application of new technologies will further improve product use efficiency. Optimize the use effect.

The application of driving recorder is a systematic project, which requires product manufacturers to standardize production and improve product technology. It also needs the common attention of management departments, operating companies and the majority of drivers. We need to improve our understanding of recorders and standardize product management. And use, jointly create a benign application environment, so as to give full play to the role of the recorder in curbing traffic violations and preventing serious road traffic accidents.

The above are the details of the driving recorder solution introduced by Shenzhen Zuchuang Microelectronics Co., Ltd. for you. If you have the electronic function development needs of the driving recorder, you can rest assured to entrust it to us. We have rich experience in customizing the development of electronic products. We can evaluate the development cycle and IC price as soon as possible, and can also calculate the PCBA quotation of the driving recorder. We are a number of chip agents at home and abroad, including MCU, voice IC, Bluetooth IC and modules, wifi modules. Our development capabilities cover PCB design, single-chip microcomputer development, software custom development, APP custom development, WeChat official account development and other hardware and software design. It can also undertake the research and development of smart electronic products, the design of household appliances, the development of beauty equipment, the development of Internet of Things applications, the design of smart home solutions, the development of TWS solutions, the development of Bluetooth audio, the development of children's toys, and the development of electronic education products.