Dual-state logic transmission and gear shifting process control method thereof

Abstract

The invention discloses a dual-state logic transmission and a gear shifting process control method thereof. The dual-state logic transmission is characterized by comprising four forward gear planet rows and a reverse gear planet row, each planet row comprises two clutches, when a single gear shifting oil pressure is actuated, one clutch is disengaged, the other clutch is engaged to form a dual-state logic structure, the power density of the transmission can be improved, and the transmission hydraulic system structure is simplified. The gear shifting process of the double-state logic transmission is divided into gear shifting under single-oil-pressure actuation and gear shifting under combined-oil-pressure actuation, the relation between the torque capacity and the oil pressure of the clutch is analyzed, the gear shifting time is used as a constraint condition, the gear shifting impact degree and the sliding friction work serve as evaluation indexes, a boosting curve under single-oil-pressure actuation and a depressurization curve under single-oil-pressure actuation are optimized, and oil pressure curve group under a combined oil pressure actuation is determined through the combination of the boosting curve and the depressurization curve, so that the gear shifting impact degree can be obviously reduced, the clutch sliding friction work is reduced, and the whole vehicle gear shifting quality is improved.

Description

technical field [0001] The invention belongs to the technical field of transmission control, and more precisely, the invention relates to a dual-state logic transmission and a shift process control method thereof. Background technique [0002] With the increasingly stringent laws and regulations on energy saving and emission reduction of automobiles and the continuous improvement of electronic automatic control technology, the loading rate of automatic transmissions for vehicles has continued to increase in recent years. Automatic transmission control can increase or decrease gears reasonably, and automatically adjust the best The working range of the engine can meet the driving requirements of working conditions, which can significantly reduce the driver's work intensity, improve driving comfort and improve fuel economy. Among them, the hydraulic automatic transmission with planetary gear transmission is the most widely used in passenger cars due to its advantages of smooth...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the problems of low power density and large shifting impact of traditional planetary transmissions. According to the characteristics of high transmission efficiency of double internal meshing planetary transmissions, a two-state logic transmission is designed, and the Shift process control method of dual-state logic transmission

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