A Feedforward Control Electronically Controlled Gear Shift System

Abstract

The invention discloses an electrically-controlled speed change gear-shifting system capable of achieving feedforward control, and belongs to the technical field of engineering machines. The electrically-controlled speed change gear-shifting system mainly comprises a gear selector and a speed change valve. The gear selector is provided with a reversing valve. The electrically-controlled speed change gear-shifting system further comprises a controller, and the gear selector and the speed change valve are connected with the controller. The speed change valve is provided with a time control electromagnetic valve, and the time control electromagnetic valve is connected with the reversing valve through a pressure regulating valve. The controller controls a pressure source at the right side of the pressure regulating valve through the time control electromagnetic valve. According to the electrically-controlled speed change gear-shifting system capable of achieving feedforward control, independent control of clutch oil charging is realized under the condition that the original properties of a vehicle on various aspects are guaranteed, speed change control flexibility is improved, speed change gear-shifting impact is reduced, and the driving comfort is greatly increased. The electrically-controlled speed change gear-shifting system is mainly used in loading machines.

Description

technical field [0001] The invention belongs to the technical field of engineering machinery, and in particular relates to a feedforward controlled electronically controlled gear shifting system. Background technique [0002] As we all know, the operating conditions of the loader are mainly shoveling and loading operations. In order to operate efficiently, the whole machine needs to frequently start-stop, forward-reverse, and shift gears. The above actions are controlled by the loader gearbox gear system. Achieved. At present, there are mainly two types of loader variable speed control systems: one is the traditional mechanical variable speed control method, which is characterized by no additional control device, low cost, and easy implementation; however, due to the performance of the flexible shaft itself, long-term use will make the gear The position is not clear, and the gear cannot be shifted; in addition, the shifting process is uncontrollable, most of them have no bu...

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Problems solved by technology

[0003] However, the principle of the hydraulic system of the electronic transmission control system in the traditional sense is consistent with that of the mechanical shift system, which causes the problem that the clutch oil filling time and the gear pressure boosting time interact with each other when adjusting the transmission boost curve, that is, When it is desired to realize fast oil filling of the clutch, the gear step-up pressure will be increased quickly, and the shifting impact will be large; on the contrary, when the clutch oil-filling speed is intended to be realized slowly, the gear step-up pressure will be slow, and problems such as shifting and waiting for gears will be caused.

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