Mercedes S-Class W-140
1991-1999 of release
Repair and car operation
+ Mercedes-Benz Cars of a class S (W-140)
+ Operation manual
+ Routine maintenance
+ Systems of cooling, heating
+ Power supply system and release
+ engine Electric equipment
+ gear shifting Box
- Автоматичеcкая transmission
Search of malfunctions - the general information
+ Automatic transmission 722.5
+ Automatic transmission 722.6
+ Brake system
+ Suspension bracket and steering
+ Onboard electric equipment
Automatic transmission, in the course of a troganiye from a place, carries out function of ordinary coupling, and during movement performs work on gear shifting.
Design of typical ATDesign of typical AT
Cut of automatic transmission
The torque converter on the functions corresponds to hydraulic coupling. Its task includes coupling implementation at a troganiye from a place and gear shifting.
The control system of transmission (known as electronic system of synchronous switching) is the component of the modified control system of the engine established only on model from AT.
Scheme of an arrangement of electronic components of a control systemLocation of the AT control unit (N15/3). In an impellent compartment, on the right at a partition
Analyzing information arriving from various sensors (not only the sensors which are directly related to transmission), the control system chooses optimum from the point of view of profitability, smoothness of a course etc. a box operating mode. At the certain provision of a zaslonka of a throttle the control system can block the hydrotransformer in such a manner that the fourth and fifth transfers will join only. It reaches considerable decrease in consumption of fuel.
The unique regular procedure of service of a box is check of level of working liquid (see. Section Check of levels of liquids, control of leakages of Head Routine maintenance). Regularly to change transmission liquid it is not necessary.
Near a radiator of system of cooling the cooler of transmission liquid is established.
The traditional switch of the kickdown mode is not present. Activation of a mode is carried out directly by a control system of transmission after processing of information arriving from the sensor of provision of a butterfly valve.
There are some operating modes of transmission, each of which can be involved after moving of the selector to one of the following provisions: «P», «R», «N», «D», «1», «2», «3», «4» (address to Head the Operation manual).
The engine can be started only if the selector is in the situation "R" or "N". It is made to prevent car movement in start attempt (if the selector is established in one of other provisions). Analyzing information arriving from sensors, the control system resolves or forbids engine start. The locations of various relays are specified in Head Onboard electric equipment).