Hydraulic transmission control system of hydraulic automatic transmission of commercial vehicle

Abstract

According to the hydraulic transmission control system of the hydraulic automatic transmission of the commercial vehicle, oil pumped out by an oil pump is divided into a plurality of paths, so that oil path connection between hydraulic elements is simpler and more visual, the phenomenon of oil pumping is avoided, the complexity of a hydraulic valve plate structure is reduced, and the reliability of the hydraulic valve plate structure is improved. More space layout application exists in the automatic transmission, and the axial size and the circumferential size of the whole box are shortened. And the retarder pressure control valve and the retarder switch control valve are simultaneously controlled through the retarder control electromagnetic valve, so that an oil path of the hydraulic control system is simple, the retarder switch control valve does not need to be independently controlled by an additional electromagnetic valve, and the use number of the electromagnetic valves and the complexity of the hydraulic oil path are reduced. The hydraulic control system of the automatic transmission is simple in structure, high in response speed and few in executive components, the control precision is high, meanwhile, enough stability is guaranteed, and therefore the mechanical and hydraulic transmission efficiency of the automatic transmission is improved.

Description

technical field [0001] The invention belongs to the field of automobile transmissions, and relates to a hydraulic transmission control system of a commercial vehicle hydraulic automatic transmission. Background technique [0002] Hydraulic transmission control system is an important system for automatic transmission to complete automatic shifting. The system can be divided into three parts: control, lubrication and cooling. Among them, the control function mainly means that when the flow of oil passes through each clutch and valve plate, it can drive the closing and opening of the clutch and the switching of the position of the valve plate and spool, so as to achieve the control effect. The lubricating function refers to the lubricating function provided by the oil when the oil flows through the internal parts of the transmission such as bearings, gears, clutches and bushings through specific oil passages. The cooling function is the heat exchange function, which can be div...

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Problems solved by technology

[0003] The traditional automatic transmission hydraulic control system is carried by multiple valve plates and partitions, and its assembly structure is complex. The corresponding valve plate is composed of multiple actuators (including valve cores, springs and plugs, etc.). The use increases the variability of the direction of the oil passage, but at the same time, the risk of oil leakage will also increase due to the increase of the bonding surface

The hydraulic control system of this automatic transmission has a complex structure and many actuators, so that the working efficiency of the automatic transmission cannot be improved.

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