Emergency deceleration control device with automatic transmission

Abstract

The invention provides an emergency deceleration control device with an automatic transmission, belonging to the technical field of automobile dual-clutch automatic gear shifting control and solving the problem of transmission oil temperature rise during emergency automobile deceleration. The emergency deceleration control device comprises a transmission control unit (TCU) in a dual-clutch automatic transmission, a clutch rotation speed sensor, a monitoring module, a transmission, a brake sensor and a transmission output rotation speed sensor, wherein the clutch rotation speed sensor and the monitoring module are respectively connected with the TCU, the transmission is used for performing automatic shift-up / down operation, the brake sensor is used for providing data to the TCU on judging whether to enter an emergency deceleration shift-down mode, the transmission output rotation speed sensor is used for providing data to the TCU on deducing the accelerated rotation speed of a transmission output shaft, the TCU is internally provided with a calibration table of increment values corresponding to the accelerated rotation speed of the transmission output shaft and gears, and the TCU compares the output accelerated rotation speed and gear signals of the transmission with numerical values in the calibration table to query and obtain the increment value, and then calculates a new shift-down point vehicle speed value by means of the increment value. The emergency deceleration control device is used for performing sharp shift-down according to an emergency deceleration condition when a vehicle is decelerated in emergency, so that the transmission oil temperature can be prevented from rising.

Description

technical field [0001] The invention belongs to the technical field of dual-clutch automatic transmission control of automobiles, and relates to a rapid deceleration control device for automatic transmission. Background technique [0002] Dual-clutch automatic transmission (DCT) is a mechanical automatic transmission that has appeared in recent years. Its power is transmitted through two empty sleeve concentric input shafts respectively connected by two clutches. The passive gears of adjacent gears are interlaced with the two input shafts. The meshing of the corresponding gears on the motor and the control of the two clutches can realize gear shifting without cutting off the power, thereby greatly shortening the shifting time and effectively improving the shifting quality. The dual-clutch automatic transmission not only inherits the manual transmission High transmission efficiency, compact installation space, light weight, cheap price and many other advantages. [0003] The...

AI Technical Summary

Problems solved by technology

[0005] Under the condition of rapid deceleration, if the downshift is downshifted according to the conventional downshifting method, the downshift request may be delayed due to the lack of time to execute, which will cause the engine speed to be too low, and cause insufficient cooling flow, which will cause the transmission oil temperature to rise, and even cause engine damage. Situation of suffocation

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