8-1-3-ehlektronno-gidravlicheskaya-sistema-upravleniya-4-stupenchatojj-at.html

8.1.3. Electronic and hydraulic control system of 4-step AT

The main objective of the transmission line is transfer of a torque developed by the engine to driving wheels of the car. The organization of the correct transfer relations in the AT reduktorny hubs allows to minimize power costs of the power unit of rotation transfer at the expense of maintenance of optimum turns.

Management of transmission is carried out in the hydraulic way on commands of the electronic module of the management (TCM), developed on the basis of the analysis of the data arriving from various information sensors. TCM carries out a choice of demanded transfer by activation of electromagnetic managing directors of the valves providing supply of hydraulic liquid a contour of the corresponding coupling of coupling. Precision control of operating pressure guarantees absence of stress of switchings and accuracy of definition of the moments of blocking of the hydrotransformer. A function chart of an electronic and hydraulic control system of AT — see an illustration the Function chart of an electronic and hydraulic control system of AT.

The placement scheme on the car of components of an electric part of a control system of AT — see an illustration the placement Scheme on the car of components of an electric part of a control system of AT.

Principles of functioning of a hydraulic part of a control system — see illustrations Design features of elements of a hydraulic path of a control system of AT and the Schematic diagram of functioning of a hydraulic contour of management of AT. The key TCM under control parameters are: switching moment; moment of blocking and moment of braking by the engine.

Also as well as the control system of the engine a control system of transmission is included in a chain of onboard system of self-diagnostics of OBD-II and in case of identification of any sort of violations the corresponding diagnostic code is brought in memory of TCM. An order of reading of codes of malfunctions — see. AT problem diagnostics - the general information. The list of the main codes is provided in Specifications (see. Transmission line).

Function chart of an electronic and hydraulic control system of AT

The placement scheme on the car of components of an electric part of a control system of AT

Design features of elements of a hydraulic path of a control system of AT

Schematic diagram of functioning of a hydraulic contour of management of AT