1, the development of automotive testing technology Automotive testing technology is accompanied by the development of automotive technology. In the early days of automobile development, people mainly found the fault of the car through experienced maintenance personnel and made targeted repairs. With the progress of modern science and technology, automobile detection technology is also developing rapidly.
2. The current research on automobile braking mainly focuses on brake controlSystem aspects, including brake control theory and method, as well as the use of new technology.
3. The parameters detected by the test station in evaluating the braking performance of the vehicle mainly include braking force, braking deceleration, braking distance and braking coordination time. The inspection methods of the braking performance of the test station are divided into bench test (that is, through the brake test table) and road test (that is, through the five-wheel instrument or decelerator). Road test can detect braking deceleration, braking distance, braking coordination time and stability; Bench test can detect braking force, braking force balance and wheel resistance.
4, use modern instrumentsStandby diagnosis is an inevitable trend in the development of automobile diagnosis and detection technology. With the progress of modern science and technology, especially computer technology, the self-diagnosis technology of automobile fault developed with the electronic control technology of automobile in the late 20th century. Because of the complexity of mechanism and structure of automobile electronic control system, it is necessary to establish a reliable fault self-diagnosis system. 5, secondly, the new diagnostic equipment and technology have been applied in reality, to a certain extent, breaking through the drawbacks and defects of traditional maintenance methods, repair personnel with advanced equipment, can be the actual and potential problems of the carDefects are detected to improve maintenance effectiveness.
6, the characteristics of the domestic automobile maintenance industry and development trend analysis China's accession to the WTO, non-tariff barriers will be gradually eliminated, the automobile maintenance market is more open, foreign capital and advanced automobile maintenance technology, equipment and management experience will have a positive impact on China's automobile maintenance industry and a huge role.
1, if the use of vivo mobile phone, refers to the connection WiFi signal is weak, you can refer to the following troubleshooting method: Check the mobile phone protectionShell If the phone uses a metal, magnetic type protective shell or bracket, such protective shell and bracket will affect the WiFi signal, it is recommended to try after removal.
2. Right-click "My Computer" - "Management" - "Device Manager" - "Network Adapter", locate the wireless network adapter, and double-click. Click the "Advanced" TAB, select "LinkSpeed/DuplexMode" in "Properties", and then select "100FullMode" under it, the network card can work at full speed.
3, if using vivo mobile phone,If the WiFi connection speed is slow, you can refer to the following troubleshooting methods: Restart the router, upgrade the router to the latest version, and check whether the network is restored. The WiFi signal strength is related to the use environment (such as walls, too far away, etc.). If the signal is weak or the Internet access is slow, it is recommended to adjust the distance between the device and the WiFi router before trying again.
4, if the use of vivo mobile phone, can refer to the following connection WiFi signal weak check method: Check the mobile phone protective shell if the mobile phone uses metal, magnetic type protective shell or bracket, such protective shell and bracketA new wireless specification, the data transfer rate of this new specification has not yet been determined, but at least it will be above 100MBps.
There are six standards for wireless networks, which are as follows: 8011a is a high-speed WLAN protocol that uses the 5GHz band. The standard can reach a maximum speed of 54Mbps, and the actual use rate is about 22-26 MBPS. It was incompatible with the 8011b, which was one of its biggest drawbacks. 8011b is the most popular WLAN protocol and it operates in the 4GHz band.
There are six standards for wireless networks,They are: 8011a high-speed WLAN protocol, using 5G Hertz band. The maximum speed is 54Mbps, and the actual usage rate is about 22-26Mbps. Incompatibility with the 8011b is its biggest drawback. 8011b The most popular WLAN protocol, using the 4G Hertz band.
The transmission speed of wireless LAN products refers to the ability of the device to send and receive data under a certain network protocol standard. This number depends on factors such as what standard support and environment the device relies on.
b is incompatible. Support for wireless aps and wireless cards in the marketIt's relatively rare. IEEE802.11g has "three" non-overlapping transmission channels. Although it also runs at 2.4 GHz, it is backward compatible with ieee802.11b, and since it uses the same OFDM (orthogonal frequency division) modulation mode as the ieee802.11a standard, it can achieve data transfer rates of 54Mbps for wireless Lans.
Wireless LAN standard is IEEE8011, today, 8011a, b, g, n, ac this protocol is now visible on the market.
1, you can try to enter the safe mode, uninstall the previously installed software, and completely kill the virus. If the situation persists, you can reinstall the system.
2, in the case of computer poisoning, you can try to enter the safe mode, uninstall the previously installed software, and completely kill the virus. If the situation persists, you can reinstall the system. U disk reinstallation system method: Prepare the installation disk (U disk) of the system.
3, if your laptop is poisoned, then don't panic. Here are some ways to deal with a poisoned computer: Start your computer in Safe Mode Press the F8 key when you start your computer to enter safe mode. Safe mode loads only the most basic drivers and services, which can help you detect and remove viruses. Disabling System Restore Some viruses use system restore to hide themselves. Disabling System Restore can help you restore to the most recent clean state.
4, if you have used some high-speed downloaders, may be installed rogue software, you can use 360 software manager purification software, or 360 security guard computer cleaning software. Or find the correlationRight-click to open the location of the file, find the anti-installation program of un, inst, setup, double-click to uninstall. If you suspect poisoning, you can use anti-virus software such as 360 Security Guard to scan the entire system. If it's poisoned and can't be killed, it could be a driving Trojan.
5, first aid box original name: "360 stubborn Trojan kill", first aid shot late service system! 2. Use the "Scan plugin" of "360 Security Guard" and then "Qingdan macro plugin" to remove it! 3. Then use "360 anti-virus dual engine version", "full scan", virus Trojan, attack noise and then delete! 4. 1, the wireless network rate of the wireless router is the rate of the wireless network. 2. FirstYou can enter the router to see each menu, whether the traffic limit is turned on, if it is turned on, turn it off; Secondly, you can try not to use a router, directly use a network cable to connect to the broadband interface, to see if the speed is significantly improved, if not, it is not a routing problem; I use 54M router, 4M broadband only in the dead of night only 400kb, usually 100kb, want to do higher bandwidth. 3. First of all, don't use the router. MODEM or direct access to the home broadband network line, directly plug into the computer network card, the computer with a dial-up connection to the Internet, with the relevant broadband test tool or web pageTo detect the bandwidth of broadband is how much, generally 10M broadband bandwidth, about 1M (1024KB) download speed. If the direct dial-up connection can not reach the bandwidth standard of 10M broadband, you can directly play broadband customer service complaints. 4, M wireless routing Internet access This 54M is the parameters of the wireless network card? That is, all people's network cards on the Internet are displayed 100M or individual 1000M, but they are not the Internet speed is 100M, the Internet speed is his home installed 2M bandwidth is 2M, installed 4M bandwidth, is 4M network speed if you install a network provider512K network, this 80K/S is normal. I have 10 megabytes of light,54M of wireless routing, why only 200 + K download speed?