Acceleration control apparatus for automobile dual-clutch transmission

Abstract

The present invention provides an acceleration control apparatus, at the start of a freight vehicle mounting a dual clutch type transmission in an ordinary condition, a smooth start is accomplished with the second speed, but the transmission is quickly shifted to the first speed when the vehicle is to start moving on the way of uphill road. At the start of the freight vehicle, first, the two input shafts of the dual clutch type transmission are set to a state of being shifted to the first speed and to the second speed and in this state, the amount of connection of the friction clutch coupled to the gear train of the second speed is increased to execute the second-speed start. After the passage of a predetermined period of time, the accelerator opening degree and the vehicle speed are detected to judge the excess or insufficiency of the driving force. If the driving force is not insufficient, the start with the second speed is continued to quickly accelerate the vehicle. If the driving force is judged to be insufficient, the friction clutch coupled to the gear train of the first speed is readily connected. The transmission has been shifted already to the gear train of the first speed. Therefore, the transmission is shifted down in a short period of time avoiding unexpected occurrence such as moving back of the vehicle even on an uphill road vehicle.

Description

technical field [0001] The present invention relates to a dual-clutch transmission, which is a transmission in a power transmission device of a vehicle, and includes two transmission input shafts coupled to an engine via friction clutches, and controls the two friction clutches while shifting gears. Speed ​​changes while connected. Background technique [0002] In recent years, various power transmission devices for automatic vehicles have been developed in order to facilitate vehicle driving and reduce driver fatigue. A typical automatic transmission is a combination of a torque converter and a planetary gear mechanism, and it is widely used as a power transmission device of a so-called automatic transmission vehicle (AT vehicle). In addition to the automatic transmission, there is a power transmission device that uses the same parallel shaft gear mechanism type transmission as a manual transmission car (MT car), combines it with an automatically operated clutch, and chang...

AI Technical Summary

Problems solved by technology

When downshifting to 1st gear on a steep uphill road, the load on the engine increases and the engine may stop or the vehicle may roll back when the shifting time is long.

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