A method for improving the comfort of upshifting with small and medium throttle openings in dual-clutch automatic transmissions

Abstract

The invention discloses a dual-clutch automatic transmission method for improving the comfort of small and medium throttle opening upshifts, which belongs to the field of transmission control. The TCU receives the throttle opening signal and the vehicle speed signal, and calculates the target gear according to the shiftmap. When the target gear changes, Enter the shifting process, and send the target gear and the flag of the shifting process to the ECU; the ECU receives the target gear and the flag of the shifting process, and calculates the target engine speed through parameters such as tire rolling radius and speed ratio; the ECU calculates the target engine speed according to the throttle Opening degree, target engine speed, pedmap calculate the target torque, and send the target torque to the TCU; TCU receives the target torque of the ECU, calculates the request torque of the TCU according to a certain rising rate, and sends it to the ECU; the ECU receives the request torque of the TCU , and output the corresponding torque according to the requested torque to realize the torque compensation function during the shifting process.

Description

technical field [0001] The invention belongs to the field of transmission control, and more specifically relates to a method for improving the comfort of upshifting with small and medium throttle openings in a dual-clutch automatic transmission. Background technique [0002] With the popularization of dual-clutch automatic transmission DCT, each independent brand has launched DCT models one after another. The number of DCT models on the market has increased year by year. The advantages of DCT in terms of economy, comfort and other aspects are favored by more and more consumers. Modern consumers' pursuit of cars is not just a simple means of transportation, but the quality of the car and the pleasure of driving. Factors such as car comfort, handling, power, economy, and drivability directly affect consumers' choices for car purchases. The comfort of the car is increasingly regarded as an important factor in the marketability and competitiveness of passenger cars. [0003] I...

AI Technical Summary

Problems solved by technology

[0004] The upshift process of the dual clutch automatic transmission, such as figure 1 As shown, for the constant torque type pedmap, when upshifting at a certain accelerator opening, the whole vehicle still has an obvious acceleration step feeling due to the change of the gear ratio, which affects the driving comfort; figure 2 As shown, for the constant power type pedmap, when upshifting at a certain throttle opening, because of the change in gear ratio and the change in torque after the gear ratio is switched, although the acceleration difference between the front and rear gears becomes smaller, the upshift During the process, there will be relatively large acceleration pits, such as power interruption and shifting, which will further affect driving comfort

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