Ten years ago, the automatic transmission was full of mystery to the Chinese people. The automatic transmission is synonymous with luxury cars. Today's transmissions are already diverse, with only one purpose - to better serve consumers.
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Today, people are increasingly demanding fuel economy for vehicles, and they pose higher challenges for new technologies. The efficiency and performance of diesel and gasoline engines has been greatly improved, and the next system with potential for exploration is the transmission. In recent years, the main way for manufacturers to upgrade the efficiency of traditional manual and automatic transmissions is to increase the gear position. European engineers are more optimistic about the future prospects of non-traditional transmissions in order to find a way to improve fuel economy and reduce CO2 emissions.
In 1986, 20 years ago, the AMT technology of the electronically controlled mechanical automatic transmission was first applied to the F1 library Ferrari, which promoted the performance of the Ferrari. From 1992 to 2007, Ferrari, which used Marelli AMT, won the F1 team championship 15 times in total, and Marelli AMT also achieved brilliant achievements with Ferrari and other teams. Today, the Formula 1 stadium is completely AMT. Currently, Marelli is a supplier to Ferrari, Renault and Red Bull. Almost all F1 cars and luxury sports cars are equipped with AMT technology. And AMT technology is also expanding from high-level, competitive motorsports to standardized products worldwide.
Marelli AMT technology is called Automated Mechanical Transmission. This technology replaces the original manual operation by adding a microcomputer-controlled electric device without changing the main structure of the original car gearbox. The gear action realizes the automation of the whole process of shifting. The shifting process is controlled by an electro-hydraulic valve, and the driver can choose between manual and fully automatic shifting modes.
The key components of AMT are mainly composed of sensors, computer modules and actuators. The actuator is an electro-hydraulic control unit, which consists of oil pump, oil storage tank, solenoid valve and other components. The operation process is summarized as follows: 1) The control module determines the current working condition of the vehicle by reading the sensor signal. 2) The shift command is given by the driver's contact (in manual mode) or by the module calculation (in automatic mode). 3) After the module reads the shift command, it performs security analysis to post-process the command. 4) The gears in the gearbox are controlled by the electro-hydraulic actuator of the actuator. This completes a complete set of shifting work.
AMT transmission shift control system for Ferrari sports car
The AMT car is easy to drive. As long as the driver steps on the throttle, the selector system automatically selects the best timing for shifting, greatly reducing the complexity of driving and also has a low power loss. Marelli's AMT is installed on some cars such as Fiat, Opel, and Citroen.
AMT saves fuel and reduces emissions, especially carbon dioxide. These two factors are well reflected in the Citroen C4. With the installation of Marelli's AMT transmission, the new C4 with a 1.6-liter Hdi engine can save 5% of fuel compared to the same vehicle equipped with a manual transmission, and carbon dioxide emissions drop from 125 grams per kilometer to 120 kilometers per kilometer. Gram. Fuel economy and emissions can be improved by up to 10% compared to vehicles equipped with automatic transmissions.
AMT transmission and shift control system for Ferrari sports cars
Since the AMT gearbox and the MT gearbox have the same gear mechanism, the maintenance cost is the same as that of the manual gearbox, and the transmission oil is the same, so the use cost is much lower than that of the AT gearbox with the hydraulic transmission, and the speed shift is effectively extended. The life of the box. AMT only adds a computer quick-select device to the MT manual gearbox, so the cost of car purchase is relatively cheap. For most manufacturers, no new investment is required from the existing manual transmission to AMT. Actuators mounted on the side of the cabinet have little effect on the cabinet dimensions.
The third generation of AMT launched by Marelli in 2006 represents the latest technology in hand-integrated transmissions. The new generation of AMT transmissions has improved significantly in terms of shifting speed and smoothness. The improved performance of the improved product can be described as "rapid". Under the same working conditions, the total shifting time is shortened from 630 milliseconds in Fiat Stilo Abarth in 2001 to 280 milliseconds in Fiat Punto in 2006.
Ferrari sports car steering wheel with AMT transmission with shift paddles
Experts predict that AMT will account for 13.3% of the cars sold in Europe in 2013, about 2 million, and more MT will be replaced by AMT, and some AT markets will also be occupied by AMT. Manufacturers that produce AMT are said to offer AMT that is smooth and has all the advantages of a dual clutch transmission, and at a much lower price. At present, the domestic gear transmission parts manufacturing technology is relatively mature, and the development and production investment of AMT is far lower than AT, which is in line with China's national conditions. In the domestic market, Chery (Parameter Configuration Gallery) QQ (Parameter Configuration Gallery) is the first to adopt Marelli's AMT transmission. This year, there will be Chery (Tiggo, A5, A1), Tianjin FAW (Weizhi, Wilo, Weizi), Hafei Road. Bao and other AMT models are on the market. In addition, the domestically-sold BMW 5 Series electronic gear selector and the Audi R8 R-Tronic belong to the AMT transmission. It seems that domestic consumers will be in close contact with more and more AMT models.
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