Engineering machinery electro-fluid automatic gear box shifting controller and method

Abstract

The invention relates to an electro-hydraulic automatic shift transmission case control device and method in engineering machinery. The device comprises an engine speed sensor, a torque converter turbine speed sensor, an engine throttle opening sensor, a vehicle speed sensor, a vehicle master controller, an engine throttle execution mechanism, an automatic shift transmission case and an electronic controller. The engine speed sensor, the torque converter turbine speed sensor, the engine throttle opening sensor and the vehicle speed sensor input signals to the electronic controller. The electronic controller is communicated with the vehicle master controller. The vehicle master controller inputs control signals to the engine throttle execution mechanism. The electronic controller inputs the control signals to the automatic shift transmission case. The invention uses different shift modes according to the intention of a driver, realizes the transmission shift of hydraulic engineering machinery in proper time, and ensures the economical efficiency, power efficiency and practicability of the vehicle. During the shifting process, the invention can ensure good gear shifting performance by controlling the engine and improve the comfort of passengers.

Description

technical field [0001] The patent of the invention belongs to a control method for automatic shifting of a construction machinery gearbox, in particular to a shift control device and method for an electro-hydraulic automatic shift gearbox of a construction machinery. Background technique [0002] The automatic shifting of the vehicle first needs to determine a certain shifting rule, that is, the rule that the automatic shifting time between two gears changes with the control parameters. According to the shift schedule, when the shift condition is satisfied, the electronic controller sends a control signal to the shift control valve of the gearbox to realize the shift operation. At present, the electro-hydraulic control part of the electro-hydraulic automatic shift transmission is generally realized by electromagnetic reversing technology or electro-hydraulic proportional technology. The electro-hydraulic proportional technology can pre-set the pressure clutch curve of the g...

AI Technical Summary

Problems solved by technology

The electro-hydraulic proportional technology can pre-set the pressure clutch curve of the gearbox through the controller, and accurately control it. It has the advantages of complete separation and smooth meshing. The shifting quality is better, but the control is complicated. Using electro-hydraulic proportional technology

The automatic shifting gearboxes used in construction machinery mostly use electromagnetic reversing technology, and the electromagnetic reversing valve is used as a pilot to control the hydraulic valve to realize the operation of the corresponding gear clutch. The pressure of the clutch and brake changes completely when the gearbox shifts. Controlled by a hydraulic valve, the control program cannot intervene in it

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