8.1.3. The Elektronno-hydraulic control system 4-step АТ
The detailed information on the device and a principle of action of automatic transmissions is resulted in the Management on automatic transmissions of series АРУС № 179 (ISBN 5-89744-069-7).
The primary goal трансмиссионной lines is transfer of a twisting moment developed by the engine to car driving wheels. The organisation of correct transfer relations in редукторных knots АТ allows to minimise power expenses of the power unit for transfer of rotation 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 management (TCM), developed on the basis of the analysis of the data arriving from various information gauges. TCM carries out a choice of demanded transfer by activation of the electromagnetic operating valves providing giving of a hydraulic liquid a contour corresponding муфты of coupling. The precision control of operating pressure guarantees absence of stress of switchings and accuracy of definition of the moments of blocking of the hydrotransformer. The function chart of elektronno-hydraulic control system АТ — see an illustration the Function chart of elektronno-hydraulic control system АТ.
The placing scheme on the car of components of an electric part of control system АТ — see an illustration the placing Scheme the car of components of an electric part of control system АТ.
Principles of functioning of a hydraulic part of a control system — see illustrations Design features of elements of a hydraulic path of control system АТ and the Basic scheme of functioning of a hydraulic contour of management АТ. The basic under control parametres TCM are: the switching moment; the moment of blocking and the 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 OBD-II and in case of revealing of any sort of infringements the corresponding diagnostic code is brought in memory TCM. The order of reading of codes of malfunctions — see Problem diagnostics АТ - the general information. The list of the basic codes is resulted in Specifications (Transmissionnaja a line see).
Function chart of elektronno-hydraulic control system АТ
The placing scheme on the car of components of an electric part of control system АТ
Design features of elements of a hydraulic path of control system АТ
The basic scheme of functioning of a hydraulic contour of management АТ