In June 1886, Carl Benz, a German, began to assemble a single cylinder engine into a special tricycle. This monster that could walk on its own caused a great sensation?? Since then, people have called it automobile for short auto, which has changed people's world,. Carl Benz once said that nothing in the world is more exciting than invention. The car inventor has devoted his life to his creation. Now his name is not only a code or symbol, but also seems to have become a symbol, even an aftertaste.

The first three wheeled car manufactured by Carl Benz was driven at the speed of 18 kilometers per hour, but it still looked like a horse drawn carriage. After more than 100 years, the world automobile industry has experienced three changes: 1914 The installation of automobile assembly line by Ford Motor Company in the United States in brought the first reform in the history of automobile industry; The post-war economic prosperity in the 1950s brought the automobile industry into an unprecedented golden age, bringing about a second change in the automobile industry; By the end of the 1960s, the Japanese automobile industry had experienced a miracle. The high-quality and inexpensive automobiles had made the automobile industry undergo a third transformation. The automobile has become an indispensable tool in our life. No matter in terms of convenience and comfort, countless pioneers have struggled for it.

In order to better serve people, various elements related to transportation have been concentrated on the bus: ancient people summarized the use of celestial phenomena for orientation recognition in order to identify the target and direction, the Big Dipper is an ancient means of navigation, and we are proud of the "compass", one of the four major inventions. However, with the advent of information technology, more powerful navigation technology has emerged, which is mainly attributed to a technology called "Global Positioning System", or GPS for short. In fact, the United States launched a military project (Transit) as early as 1958, On this basis, we began to build and develop GPS in the 1970s, but the application results of the Gulf War in the 1990s were greatly unexpected and began to attract attention. The navigation is realized by using satellite positioning technology and electronic map.

As for the rapidly changing urban construction, how to reach the destination as soon as possible has given birth to the car navigation market, and the standard audio system (the earliest one is just a radio, which is why MOTOROLA started) on the car has gradually developed into an audio and video system, so the car navigation has also integrated these two systems.

This is the Desai Siwei NV5015 car navigation all-in-one machine provided by Lei Feng for trial use. Lei Feng's trial use is a well-known platform for using digital equipment in China. Compared with other digital products, NV5015 vehicle navigation all-in-one machine is a special device. Because it is a vehicle device, it has stricter requirements for installation and safety than ordinary digital products. Generally, 99% of users who install this device will choose to go to the car decoration shop. Only a few people will install it themselves. The people who need to install it have certain car structure I happen to know a little about the principle and circuit, so we started from the installation, and through a series of process pictures and text introduction, we will share some details of Desai Xiwei, which will help users to purchase as a reference.

Usually, the "car machine" was only a radio at first, and later it was integrated with CDs. For a while, the "disc box" was also used to load eight CDs at a time. The "head" installed on the central control panel of the car is called for short, which is the origin of the name "car machine". The car machine was installed at this time as "fixed (DIN)" For the size, specifically the thickness of the car, the car usually reserves 1-2 "fixed" space, forming a standard. Later, with the personalized design of automobile manufacturers, the panel gradually abandoned the unified standard and formed a series with strong pertinence. Of course, this is also related to the wiring at the rear of the car machine - referred to as "tail plug". Therefore, the handpiece is usually compatible with the specified vehicle type.

As soon as the panel of the car machine is changed from the past, it is usually dominated by a large display screen, surrounded by multiple buttons or knobs. The earliest car machine is not intelligent, just like an ordinary recorder or CD player. But with the emergence of Microsoft's embedded operating system WinCE, the car machine has emerged as an intelligent car machine, which is actually a small computer, With the popularity of Android system, the operating system of the car phone is also embedded with Android system. Just like the mobile phone, compared with the original Volkswagen car phone, the touch screen replaces the operating buttons. For example, the NV5015 we introduced in this article is an 8-inch multi touch capacitive screen, and there are no physical buttons or knobs except the power key. They are all completed by the touch screen and touch buttons, There are volume keys and Android specific home key and return key. The only physical key is the power key, which is designed to be small. However, as a car engine, the author does not agree with this design, which we will analyze later.

From the side view, the thickness of NV5015 in the car market is the "DIN" we mentioned earlier, which is the height of the installation slot occupied by the car and the machine.

The rear part is the wiring port. The wiring is different according to different models. Because it is an integrated car machine, there are GPS antenna interfaces, WIFI antenna interfaces, 4G mobile network antenna interfaces, and reversing image input interfaces in addition to the power line, speaker cable, and radio antenna interfaces usually provided by the car machine.

Next is the attached accessories. Because they are highly matched with the vehicle model, the accessories are simple. There are three antennas. For the three antenna interfaces mentioned above, there are also reversing camera terminals and CAN leads. The CAN leads are connected to the bus system of the vehicle to extract some states of the vehicle, which will be mentioned later,

To is the CAN lead, which is composed of a pair of twisted pairs. One end is the connector of the car receiver, and the other end is the pressed DuPont head, which can be directly inserted into the CAN hole in the connector of the BCM box.

This is the terminal line of the reversing camera. Generally, an ordinary car machine has a video input terminal, a power terminal and a trigger terminal. Needless to say, the power terminal is a connection that provides power for the reversing camera. The video terminal is a signal line to receive the camera. The trigger terminal is used to detect the reverse gear status, so that the car machine can switch the displayed content to the reversing camera signal. Of course, there are also some installation methods. The power line is not led out from here, but taken from the reversing light, so that once the reverse gear is engaged, it will provide power for the camera, and the trigger line is also taken from the reversing light. A 12V voltage is coming from the reversing light, which is used for the vehicle machine as the switching signal. However, the vehicle to be modified has a CAN bus, so the trigger line can not be connected, The car engine judges whether it is in reverse gear through the CAN bus, thus triggering display switching.

This is a GPS antenna. It is an active high gain antenna. It has a magnetic suction and waterproof design, and can be installed outside the car. However, we usually install it below the front gear. Because the current GPS receiving circuit is very sensitive, it is also an active antenna, and the signal attenuation caused by the front gear can be ignored.

This is the tail line of USB interface, which can be understood as the OTG interface of Android system. It can be connected to an external USB flash disk to play media. NV5015 supports the play of multiple media formats, and has the ability to play lossless audio files. Of course, this USB interface is also the data channel for future system upgrades.

This is the 4G antenna and the WIFI antenna. Because they are used in vehicles, they need to be installed in a concealed location. Considering that they can prevent abnormal noise from collision with other parts due to vibration, they are wrapped with sponge. We plan to install them on the side of the dashboard near the center console. The manufacturer recommends installing them in the A pillar, but the A pillar is metal, which has a great attenuation on the signal.

After seeing the parts, we are going to assemble them now. This is the old navigation car machine, a 7-inch resistive touch screen and a single CD. It was installed in 2009. The WINCE system was the most powerful navigation car machine at that time. Unfortunately, the development of technology will eventually abandon these old products. After all, they have been used for nearly 7 years. Take it down.

Now let's talk about CAN bus. CAN is the Controller Area Network It is a serial communication protocol bus based on real-time application. It uses twisted pair wires to transmit signals. It is specially designed by German BOSCH company for vehicle detection and control. The basic principle is that as long as all units are connected to the bus according to the specified protocol, any contact in the bus can return information to other contacts, for example, In the car, the signal of CAN bus is supported, and various internal control units transmit data through CAN, so that the trip computer can understand the status of each unit. The NV5015 supports the reading of CAN bus data, and can identify engine speed, battery voltage, mileage, remaining fuel and other information.

To lead out the CAN bus signal, connect it from the corresponding terminal of BCM. What is BCM? BCM is the body control module, which is also the trip computer. The BCM module of Volkswagen is usually only under the steering wheel.

Let's climb down to the ground and have a look. Do you see this black box? This is the BCM module. There is a purple 16 pin socket on the top, which is the BCM communication interface. When you go to SSSS to service the vehicle, the home diagnostic instrument is connected to this socket, you can check the status of the vehicle, debug some parameters, eliminate fault codes, etc. Under amateur conditions, we can also adjust some parameters by buying a 5053 interface cable and using a laptop, For example, automatic locking at 15km, activation of anti-theft alarm function, etc., the author has helped people around debug many cars... Well, too much said, we don't want to say this, we want to say how to find the CAN lead of BCM. It is suggested that there are two connectors below, one is white, the other is black, and there are CAN bus terminals in the white one.

In front of the white plug-in, there is a locking mechanism. Press the bayonet to pull the latch down, so the whole white plug-in is removed from the BCM module.

Then take out the white shell, and the black socket will be displayed in front of you.

Take out the black socket, which is composed of two layers. Once sliding from left to right, it will be separated. In the lower layer, find plug 20 and plug 21. These two plugs are empty for our beggar version of the car. High configuration models, such as those with steering wheel control, are controlled through the CAN bus, so we need to connect these two plugs to the CAN line of the car machine, 20 is CAN+, 21 is CAN -.

Now, instead of busy connecting the CAN, we need to remove the central control first. First, pry the panel of the car engine loose, and then pry the air conditioner outlet, so that all the panels can be removed. After removal, we can see that four T20 screws are fixed to the car engine.

After loosening the screws, the old car machine can be removed. It's time to retire from the old plane that has served nearly 7 years. Don't always occupy a seat and let the young people take it.

The original car machine is matched with the original car by inserting conversion lines at the end. As you can see, the dense lines are removed one by one. The lower right figure shows the newly installed car machine. That is, the NV5015 uses the original interface, so there are fewer lines. It can be inserted according to the color.

Take a recent photo. Unfortunately, this car doesn't have an additional video input interface. In this way, the car recorder I originally installed doesn't have a channel for playing. The original car camera has a video input in addition to the reversing camera. I connected the car recorder, and now to see the contents of the car recorder, I have to take off the memory card and plug it into the power supply.

Because I also have a tachograph, I need to connect it to the power supply, so I need to break the cable. If I don't have a tachograph, I don't need to break the cable. When I break the cable, I accidentally hit the ground and burned one of the fuses. The 20A one is not available. I only have to pull a 10A one from the replaced car for temporary use (the red one is 10A, the yellow one is 20A)

The fuse box is in the cover plate on the left side of the central console in the cab. The number 35 on the label is the audio fuse. Now we have replaced it with a 10A one.

Replace the insurance, and the car engine will light up immediately.

Now it's time to connect the CAN cable. When loading the car, put this pair of twisted pair wires above the pedal.

As it is a good Dupont head, it can be installed in the holes 20 and 21 directly. It is very simple, and then restored.

Put the plug back on the BCM module. At this time, the car engine will pick up the vehicle information and display the information read out from the screen. The remaining fuel in the fuel tank is 51 liters, the seat belt is not connected, the engine is not connected, and the vehicle speed is not. Of course, this is because we did not start the car. The battery voltage is 13.10 V, and the cumulative mileage is 34999 km. Alas, I'm sorry, I've bought the car for six years, and I'm ashamed to have only traveled so far... Of course, another unexpected thing happened. I bought a beggar's version of the car. The door status detection has an icon on the original dashboard. As long as there is a door that is not closed properly, there is an icon. Usually you can't accurately determine which door is not closed properly. Now, the status of all four doors is out!

We have no connection for the reverse gear trigger. The car will directly switch the display content according to the signal sent from CAN. Because the resolution is much higher, it feels very clear.

The GPS antenna goes out from the center console to the right and is placed directly below the front gear, and is glued with 3M double-sided adhesive tape.

The USB tail wire is led out from below, and there is just a small groove. It's amazing. Everything fits perfectly!

This is the position where the USB leads out. The red arrow in the figure shows that the upper two pictures are recent photos, which are placed in the storage compartment under the central control as if they had not been changed. Then, tighten the 4 no T20 screws, replace the panel, and replace the air conditioner outlet.

Now it's time to look at the functions. After the car machine is turned on, there are three interfaces. The main interface is 8 icons. You can see the content yourself. I don't need to say the purpose. Because the icons are large, it's easy to operate. It should be noted that NV5015 supports its own wireless tachograph, air purifier and tire pressure detection. Unfortunately, we don't have these accessories. It seems that it will cost a lot of money to complete them.

There are three icons on the right side of the interface. The tire pressure detection mentioned by Gancai is right here. Valubo is an application used to play back videos in conjunction with the DASH CAM. Setting is equivalent to the setting function of Android system, which is used to set the car machine status.

The left side is reserved for users, and applications installed in the future will be displayed here.

In any state, as long as the safe and door states are triggered, it will switch to the vehicle information state. For example, in the radio or navigation interface, as long as the door is opened, this interface will be displayed immediately. When the door is closed for about 5 seconds, it will automatically return to the original state, which is very practical.

This is the original vehicle bid negotiation. There is less information displayed. The information displayed on the car's engine is very full now, because of the battery and door icons in the tachometer.

Now for navigation, the first NV5015 is equipped with the fall 2015 version of Kailide map. Due to the use of high gain active antenna, satellite signal reception is very strong. Of course, the first time you use it, you need to download the ephemeris, which will be slower. Once the first time you successfully locate it, the positioning will be very fast in the future. Almost all you need to do is click on the navigation software to complete the positioning in 2 seconds, From the perspective of satellite signal strength, the signal quality is very good, even under the viaduct. Of course, if you are in the underground garage, you cannot locate because satellite signals are only available outdoors. The only disadvantage is that the Kalide map is a little rough, and the Gaud map can be installed for special needs. Of course, the functions of Kalide are very rich. After all, Kalide has been specialized in mapping for so many years, and is the leader in navigation software. The live map is very useful. There are live maps at every intersection, elevated upper and lower entrances, and gas stations. In the case of networking, it can also be navigated through customer service. As long as you tell the destination, The background customer service will send an optimal route to the vehicle via the network to avoid the driver from operating on the navigation machine, which increases the safety.

As the original function of the car machine, it is entertainment. First, let's test the music playing ability, plug in the USB flash drive with the MP3 file, and enter the "U" The contents of the "Multimedia Disk" will be read out immediately. Touch it to start playing. It supports APE lossless compression format. The sound quality has improved several grades. Through listening, I found that the sound quality of the original car machine is almost the same, which is many times better than the old navigation car machine I removed.

Answering the phone during driving is a factor affecting safety. If the mobile phone and the car phone are paired through Bluetooth, the car phone will realize hands-free call. Through the test, the call quality is good, and the other side can hardly hear noise. You can also download the phone book. When you call, the name is directly displayed on the screen, which is very intuitive.

Interestingly, the Bluetooth interface can also display the signal strength and battery power of the phone.

In the setting, you can set some parameters to make the car more in line with your usage habits.

In the radio interface, you can pre store radio stations. Those who like to listen to traffic news will not be unfamiliar with this. Usually, people only listen to FM band radio now.

Now let's try the 4G function of All Netcom. Unfortunately, we only have the 4G phone cards of China Unicom and China Mobile, but not China Telecom. Let's test the 4G phone cards of China Unicom and China Mobile.

After the card is loaded, the MicroSIM standard card, referred to as the large card, is used. The signal strength is increased, and the download speed is fast. Of course, we recommend that you download software by linking it to WIFI. For example, install a route in your garage, and rub a WIFI in the parking lot. Of course, local tyrants please skip this point. The 4G cards of China Mobile and China Unicom can be used normally. In order to save money, we quickly took out the card after the test. The traffic can't hurt. The most important thing is that this car phone supports 4G to WIFI hotspot. Well, you said that almost all mobile phones have this function, but this is a car phone. Of course, if you have a card with unlimited traffic, it will be much better. Of course, except for local tyrants. As ordinary people, we still plug the SIM card into the mobile phone, and the car machine needs to use the network. For example, under the condition that the traffic is not consumed by the navigation traffic reception, turn on the mobile phone hotspot, and let the car machine share the 4G network of the mobile phone, so that we don't need to get a card for the car machine.

As long as there is a network, there are only a few applications that can be searched. It should be customized by the manufacturer for the system, and it needs further development and more applications. However, we think that more applications should be handed over to mobile phones or tablets. After all, mobile phones do not do this.

Speaking of WIFI, we found a lot of WIFI in the parking lot search, and broke several links with the WIFI master turnkey on the mobile phone.

Due to the use of a high gain antenna, the reception quality of WIFI is better than that of mobile phones, and several signals that cannot be received by mobile phones are received.

Due to the Android 4.4 operating system, Qualcomm Snapdragon 8-core 64 bit CPU: 1.5Ghz RAM: 1G ROM: 16G hardware, although 1G running memory and 16G storage memory are not enough for the current popular Android system, this is not a mobile phone but a car phone, so the configuration is enough. During the use process, two shortcomings were also found. One is that the touch screen and display screen are not fully fitted technology, and there is a gap between them, so dust is easy to enter, In the case of direct sunlight on the screen, we can clearly see the dust inside the screen. The most important thing is that there are no physical buttons except the power button. We see that the head of the original vehicle, the power button, the volume button, and the channel selection button are huge knobs. The reason for this design is that when driving, these buttons should be operated, which is usually blind operation, that is, without looking at the vehicle, you can quickly find the button/knob from the touch of your hand without leaving the road, It is helpful for safe driving, but now more and more car models use Android system, and the buttons are small and have no touch. In this way, you have to look at the car machine panel. If you want to press the volume+, you will accidentally press the return button... However, the car machine panel is occupied by most of the space of the display screen. If you want to put physical keys, you have to reduce the screen size, which is a dilemma. However, The author still wants to warn everyone not to operate the vehicle when driving to avoid danger.