Hydraulic control apparatus of an automated multi-step change-speed gearbox

Abstract

The invention relates to a hydraulic control apparatus of an automated multi-step change-speed gearbox, having a plurality of gear actuating cylinders (Z1 - Z4) for engaging and disengaging the gears of the multi-step change-speed gearbox, having at least two pressure-controlled gear regulating valves (GV1 - GV3) for controlling the operating pressure in in each case one pressure chamber (D1 - D8) of the gear actuating cylinders (Z1 - Z4), and having a multiplex arrangement (2, 102) of a plurality of singly switchable pressure-controlled selection valves (WV1 - WV3) for assigning the gear regulating valves (GV1 - GV3) to in each case one pressure chamber (D1 - D8) of the gear actuating cylinders (Z1 - Z4). In order to simplify the construction and to make broadening of the functional scope of the control apparatus (1.1, 1.2) possible, there is provision for at least one common pilot control valve (W1 - W3) formed as a control valve to be provided for actuating one of the gear regulating valves (GV1 - GV3) and at least one of the selection valves (WV1 - WV3), wherein the pilot control valve (W1 - W3) has a first control pressure range (Delta P_B1) which contains the switching pressure (P_S) of the at least one selection valve (WV1 - WV3) and a second control pressure range (Delta P_B2) which contains the regulating range (Delta P_R) of the gear regulating valve (GV1 - GV3).

Description

technical field [0001] The invention relates to a hydraulic control device of an automatic multi-stage transmission, the control device has: a plurality of gear servo cylinders for engaging and removing gears of the multi-stage transmission; at least two pressure-controlled gear adjustment valves for It is used to control the working pressure in each pressure chamber of the gear servo cylinder; and a multi-way mechanism composed of multiple selector valves that can be controlled by single switch pressure, and these selector valves are used to distribute the gear adjustment valve to the gear servo cylinder. One pressure chamber each. Background technique [0002] For a long time, automatic multi-stage transmissions have been known in different embodiments, not only in the construction type of automatic transmission with a single input shaft and an assigned release clutch, but also in two input shafts assigned by one of the two partial transmissions and A design of a dual-clu...

AI Technical Summary

Problems solved by technology

Although the use of a single gear adjustment valve has cost advantages and structural space advantages compared with the above-mentioned control device, however, due to the connection control of the working pressure of the two pressure chambers, the function is limited, and due to the electromagnetic control. The cost disadvantage and structural space disadvantage of

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