Control device for automatic transmission

Abstract

According to the present invention a vehicle is equipped with an engine 1, an automatic transmission 3, an AT controller 10, and an engine controller 11. The AT controller 10 has an upper limit torquechange processing unit 10a which, when a 1-2 auto-upshift from the first gear to the second gear is executed in conjunction with an increase in the vehicle speed, changes the upper limit torque froma first upper limit torque to a second upper limit torque that is set higher than the first upper limit torque. When an inertia phase begins in the 1-2 auto-upshift the upper limit torque change processing unit 10a increases the upper limit torque during the inertia phase according to a prescribed gradient from the first upper limit torque to the second upper limit torque. Thus, when an automaticupshift due to an increase in the vehicle speed is executed, it is possible to suppress the occurrence of upthrust shock while maintaining acceleration performance.

Description

technical field [0001] The present invention relates to a control device of an automatic transmission mounted on a vehicle and a control method of the automatic transmission. Background technique [0002] Conventionally, there is a torque control unit that performs suppression control of engine torque when an automatic transmission is upshifted. The torque control unit describes an integrated engine and automatic transmission control device that limits engine torque to a value at the time of shift start when the upshift is a power-on upshift (see Patent Document 1). [0003] In the above-mentioned conventional device, when the upper limit torque of the second speed stage is set higher than the upper limit torque of the first speed stage of the engine torque, when the accelerator is depressed and started, the speed from the first speed stage to the second speed stage is executed due to the increase of the vehicle speed. Level automatic upshift. In this case, if the automati...

AI Technical Summary

Problems solved by technology

In this case, if the automatic upshift from the 1st speed to the 2nd speed ends, the engine torque will rise and change in stages from the upper limit torque of the 1st speed to the upper limit torque of the 2nd speed at the end of the shift. The sharp rise in engine torque creates the problem of top impact

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