1, the transmission sequence of
(the AMT) is a conventional manual gear transmission based on the improvement comes; Hydromechatronics it combines the automatic transmission AT and MT advantages of both; AMT has both the advantage of the ordinary automatic shift of the automatic transmission, but also retains the original manual transmission gearing high efficiency, low cost, simple structure, easy to manufacture strengths. It is the transformation in the current manual transmission, to retain most of the original cartridge member, changing only the portion where the shift lever manually operated system, production inheritance, and less investment cost transformation, very easy to be accepted manufacturer .
passing through the driver lever and the accelerator pedal to the electronic control unit (ECU) control signal; an electronic control unit signal acquisition engine speed sensor, a vehicle speed sensor, etc., always grasp the state of the vehicle; an electronic control unit ( ECU) in accordance with these signals by a program stored therein to the optimum, the optimum shift schedule, the clutch fuzzy control rule, law, etc. adaptive engine fueling, fueling of the engine is separated from the binding pair, clutch, transmission shift three actions and timing to achieve the best match. To give excellent fuel economy and dynamic performance and the ability to quickly shift to a smooth start with in order to achieve the result desired by the driver.
2, SMG
SMG characteristics and working principle
SMG gearbox (SequentialManualgearbox) was originally developed by BMW and two top parts company GETRAG and SACHS (ZF) R & D cooperation the new concept transmission system, the first in 1996 by the equipment on the BMW E36M3 sports car, the BMW as the first generation of semi-automatic transmission system, its origin should come from BMW to participate in a push-pull transmission system BTCC (British Touring car) when used technology, which is a historic BMW racing technology transfer to civilian witness. SMG has been developed to the third generation of products, loaded on the previous generation M5 and M6 models (the latest model has been replaced by a dual-clutch transmission SMGⅢ). The first generationSMG has S (manual), A (automatic) in two shift mode, the driver can switch between manual and automatic. When the selected mode is A, which is an automatic transmission, the computer can automatically select the exact shift point vehicle speed and engine speed, smooth shifting, without significant impact; S mode is selected when the shift lever is pulled rearwardly l at a shift, the forward push down a gear, if the gearshift lever does not move, even if throttle in the end, it will not shift gears, then it is entirely a purely manual transmission.
SMG is undoubtedly the emergence of a major breakthrough in the history of transmission, it brings the advantages are obvious. First, a series of SMG shift operation can be completely controlled by the computer, so it’s just like a normal AT the same driver does not have a clutch pedal, you can easily shift to complete the task, even in S mode, you also need to do just before the push or pull the shift lever, eliminating the complicated procedure manual transmission, but due to restricted lifting gear sequence, the SMG does not erroneous operation since the driver linked to the wrong gear, which is in particularly important on the car. Secondly, the principle SMG is based on the manual transmission, although operating with “Tiptronic” is somewhat similar, but there is no torque converter, the energy loss during transmission is very small, simple, cheap, the economy of the vehicle can be improved.
SMG transmission in fact similar in function to the conventional manual transmission, except that it uses an electronic rather than mechanical transmitted shift signal, and selected by a computer controlling the clutch, a shift mechanism, it still belongs to a sequential gearbox manual gearbox category. SMG by an ordinary transmission gear, and an automatic transmission mechanism composed of an electronic clutch. The gearshift fork into two servers and server portions of the selected bit, the server generally uses an electric motor or a hydraulic motor, for sliding fork server to complete the shift fork, the selected bit is used to select the server work need to fork.