9.1. General information
During a start of motion of AT acts as ordinary coupling, and at movement of the car performs work on gear shifting.
The AT main hubs are: torque converter (hydrotransformer), planetary reducer, hydraulic or electronic control units. Hydrodriving disk and tape brakes and disk couplings are applied to transition to other transfer relation in a planetary reducer.
The torque converter on the functions corresponds to hydraulic coupling. Its task includes coupling implementation at a start of motion and gear shifting. The hydrotransformer is equipped with the blocking coupling which is carrying out direct coupling of the engine with AT.
The control system of automatic transmission is interfaced to a control system of the engine by means of the tire CAN and on the basis of the analysis of the data arriving from various information sensors (not necessarily directly related to functioning actually AT), chooses optimum from the point of view of profitability, smoothness of switchings and other a mode of functioning of AT. AT has the control unit (TCM). At failure detection in memory of the control unit the corresponding code (registers see. Specifications to the Head of System of electric equipment of the engine).
The unique procedures of service of AT which performance should be made on a regular basis, check of level of its working liquid (ATF) and ATF replacement is. The order of performance of these procedures is stated in Sections Check of levels of liquids, control of leaks and AT transmission oil Replacement (respectively) Heads of Control and routine maintenance of the car.
Thanks to application Д/В of the P/N modes (PNP sensor) start of the engine can be carried out only when the lever of the AT selector is in the situation "R" or "N" that allows to prevent casual movement of the car in start attempt.
At an exit of their system of the sensors, being used the block TCM, AT passes to emergency operation of work. Thus the car can the engine forward only on the 4th transfer. Ø/m valves of gear shifting are disconnected.
The general information on work and AT design is provided in the present Chapter only.
The repair of AT connected with its dismantling, it is necessary to charge to experts.