Intelligent automatic speed change control system for loading machine and control method for intelligent automatic speed change control system

Abstract

The invention discloses an intelligent automatic speed change control system for a loading machine and a control method for the intelligent automatic speed change control system. The system is characterized by comprising a working condition identification controller, a shift point computation controller, a shift execution controller and a shift execution mechanism. Shovel loading and driving working conditions can be identified by a feed-forward and feedback control method in combination with a standard power shift rule by detecting the oil pressure of a boom cylinder main chamber, the aperture of an accelerator, the speed of a finished automobile, the rotating speed of an engine and the rotating speed of a turbine of a torque converter. The system and the method have the advantages that: a shovel loading working condition and a transportation working condition can be distinguished according to the oil pressure and the oil pressure change rate of the boom cylinder main chamber, and gear shift can be distinguished according to the working conditions. The control method comprises the following steps of: under the shovel loading working condition, prejudging the reduction in gears of the finished automobile; controlling the reduction in the gears in advance; and prejudging requirements on the maximum traction force and the lowest gear. The whole control system and the control method have a simple structure and are easy to realize; and the gears are changed according to the driving working condition and the operation working condition of the loading machine, so that energy-saving and high-efficient automatic speed change control is realized.

Description

Technical field [0001] The present invention relates to a control system and control method for automatic transmission in engineering machinery, and more particularly to an intelligent automatic transmission control system and control method for a loader mainly used for loaders. Background technique [0002] At present, the automatic transmission control systems of loaders produced or used at home and abroad mostly adopt traditional control methods similar to the automatic transmission systems of automobiles, such as selecting the two parameter method of accelerator opening and vehicle speed, selecting accelerator opening and transmission input gear Three parameter method of speed and output gear speed, etc. In addition, by introducing parameters such as acceleration and working pump torque, using fuzzy algorithms, neural networks, etc. to identify the driver's intention, the traditional transmission control method can be modified to make the gear shift more reasonable. [0003] H...

AI Technical Summary

Problems solved by technology

[0003] However, the working environment of the loader is harsh, the shifting operation is frequent, the load changes drastically, and most of the operations are cyclical, and its shifting requirements are quite different from those of automobiles.

Due to the sharp drop in the speed of the loader during operation, the shifting process usually takes about 0.5 to 1.5 seconds, which leads to the fact that the gear position cannot keep up with the changes in the working conditions using the general shifting control method, resulting in shifting lag.

For example, in the process of shoveling during operation, the speed of the vehicle drops sharply due to the insertion of the bucket into the material pile. According to the general speed change control method, the gear is often lowered to the first gear when the speed has dropped to close to zero, which affects the efficiency of the operation.

In addition, since the shifting process is usually accompanied by power interruption and clutch slipping, the general shifting control method often starts from the power and economy of the vehicle after shifting, and ignores the time and energy loss during the shifting process.

For example, in the process of shoveling during operation, when the materials in the stockpile are loose materials, the second gear should be maintained to meet the traction demand of the operation, while the traditional control method still reduces the vehicle to the first gear due to the decrease in vehicle speed, which increases the Unnecessary shifting process shortens the service life of the clutch and reduces operating efficiency

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