Hydraulic automatic gear shifting device of crawler-type engineering machinery and control method thereof

Abstract

The invention provides a hydraulic automatic gear shifting device of a crawler-type engineering machinery and a control method thereof. The hydraulic automatic gear shifting device is characterized in that shift control parameters are turbine revolutions and accelerator signals. The device comprises a turbine speed sensor, an accelerator signal sensor, a brake signal sensor, a gear shifting mode selection switch, a gear shifting signal sensor, an ECU (electronic control unit), a drive power supply and an electro-hydraulic gear shifting device, wherein the gear shifting mode selection switch, the turbine speed sensor, the accelerator signal sensor, the brake signal sensor and the gear shifting signal sensor are used for collecting data and then sending the data into the ECU (Electronic Control Unit); and the ECU is used for processing the input information and outputting the processed input information to the electro-hydraulic gear shifting device to realize the operation of gear shifting. According to the control method of the automatic gear shifting, the dynamic property and economical property of the drive system are considered; and the work efficiency and comprehensive performance of the crawler-type engineering machinery can be obviously improved.

Description

technical field [0001] The invention relates to an automatic shifting device, in particular to a hydraulic automatic shifting device for a crawler-type construction machine. Background technique [0002] Due to the extremely harsh operating environment and conditions of construction machinery, in order to improve its adaptability to randomly changing external loads, most of them use hydraulic transmission in series with a mechanical transmission with hydraulic power shift. This hydromechanical transmission device has many advantages of both hydraulic transmission and mechanical transmission, such as smooth start, rapid acceleration, etc.; at the same time, the transmission of power through liquid can reduce the dynamic load and vibration of the transmission system and prolong the use of the transmission system. Life, improve vehicle driving safety and passability. Usually, as long as the matching is reasonable, it can not only avoid the engine "stall" problem under the heav...

AI Technical Summary

Problems solved by technology

However, there is a big difference between construction vehicles and automobiles, especially the operating conditions of crawler construction machinery are obviously different from those of automobiles and wheel loaders, and there are no crawler construction machinery products with mature automatic shift technology.

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