Gear-shifting control method for automatic hydraulic speed changer

Abstract

The invention discloses a gear-shifting control method for an automatic hydraulic speed changer. The gear-shifting control method comprises the steps that in the one-time gear shifting process, only one clutch is started, the other clutch is combined, the torque exchanging process is carried out between the two movement clutches, oil pressure is controlled through the combination of the clutch controlling step and the separated clutch controlling step, and the flexible clutch combination is guaranteed by adjusting the K1 and K2 control pressure in the gear shifting process. The engine torque changing is controlled, and easy, efficient and smooth gear shifting controlling of the automatic hydraulic speed changer is achieved. The test carried out under the full accelerator aperture and other limiting conditions such as gear lifting and gear jumping and reducing in a low-gear gear area shows that the control method can meet the requirements for gear shifting quality of forward torque gear lifting, forward torque gear reducing, negative torque gear lifting and negative toque gear reducing.

Description

technical field [0001] The invention relates to a shift control method of a hydraulic automatic transmission, which belongs to the field of shift control of automatic transmissions. Background technique [0002] With the development of the automobile industry, automatic transmission vehicles are more and more favored by consumers. Compared with manual transmission vehicles, which require frequent shifting operations, are easy to cause driver fatigue, and affect driving safety, hydraulic automatic transmission vehicles are easy to operate and have good adaptability, which greatly improves the service life of the engine and drive train. The hydraulic automatic transmission changes the transmission ratio by opening and combining the shift clutch to complete the shift control process. [0003] In the process of realizing the present invention, the inventor found that the prior art has the following deficiencies: However, due to the complex and changeable driving conditions of t...

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Problems solved by technology

[0004] The problem to be solved by the present invention is to provide a gear shift control method for a hydraulic automatic transmission in view of the above problems, which overcomes the defects of shifting shock, vibration or frustration in the process of gear shift switching in the prior art. After the control method, the problem of shifting impact during the gear shifting process is solved, and a simple, efficient and smooth hydraulic automatic transmission shifting control is realized.

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