Main oil pressure control method of automatic transmission

Abstract

The invention provides a main oil pressure control method of an automatic transmission. Torque transmitted from an engine to a clutch set or a brake belt and torque transmitted out by a clutch or thebrake belt are obtained, then according to the torque transmitted from the engine to the clutch set and the torque transmitted out by the clutch set, the maximum oil pressure needed by the clutch setis calculated out, or according to the torque transmitted from the engine to the brake belt and the torque transmitted out by the brake belt, the maximum oil pressure needed by the brake belt is calculated out, and the maximum oil pressure needed by the clutch set or the maximum oil pressure needed by the brake belt serves as the minimum main oil pressure needed by the automatic transmission. According to the control method, the minimum main oil pressure needed under all gears and in the gear shifting process of the transmission can be calculated out precisely, impact in the gear shifting process is reduced to the great extent, comfort of a driver is enhanced, the transmission efficiency of the transmission is improved, meanwhile, it can be ensured that the condition of galloping does notoccur in the gear shifting process, and the product quality is ensured.

Description

technical field [0001] The invention relates to vehicle transmission technology, in particular to a main oil pressure control method of an automatic transmission. Background technique [0002] The transmission is a very important department in the modern transmission system. In order to improve the efficiency of the transmission system, people have carried out quite a lot of research and development work recently. One of the more important areas in the development of dual clutch transmissions is to improve the efficiency of the transmission. One of the controllable elements of the transmission is the main oil pressure. If the main oil pressure can be guaranteed to meet the minimum oil pressure higher than the dual clutch work requirements, the lower the main oil pressure, the higher the transmission efficiency. [0003] At present, there are mainly two main oil pressure control methods for automatic transmissions on the market. The first one is not to control the main oil p...

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Problems solved by technology

[0003] At present, there are mainly two main oil pressure control methods for automatic transmissions on the market. The first one is not to control the main oil pressure, that is, no matter what the current vehicle or gearbox is in, the main oil pressure is not controlled. Only one maximum main oil pressure is given, so the main oil pressure of the transmission is uncontrollable; however, the second control method is mainly an empirical value assigned by the calibration engineer according to different torques and different vehicle speeds, rather than calculated. , it will appear that when the main oil pressure is too large, the transmission efficiency will be reduced due to the main oil pressure being too large, resulting in a waste of energy and a series of adverse effects such as increasing the fuel consumption of the vehicle; or there will be a series of adverse effects due to insufficient verification of working conditions. , resulting in the main oil pressure assignment being too small and causing the engine to run away during the gear shifting process

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