Mechanical digger full power control system and method

Abstract

The present invention relates to an excavator all-power control system and its method. Said system mainly includes the following components: main pump, feedforward-feedback regulator, PID regulator and electro-hydraulic proportional valve. Said invention also provides the concrete steps of its control method. Said system not only can save energy, but also can raise power utilization rate, and can implement completely matching of absorption power of oil pump and output power of diesel engine.

Description

technical field [0001] The invention relates to an excavator full power control system and method. Background technique [0002] When the original excavator was designed, the power matching method was adopted so that the maximum power absorbed by the oil pump was slightly smaller than the maximum power of the diesel engine corresponding to the throttle position. In other words, as long as the driving torque of the oil pump is slightly smaller than the net output torque of the diesel engine corresponding to the throttle position, the most basic condition for stable operation of the system can be met, as shown in the appendix figure 1 shown. Since the characteristic curve of the constant power pump is an approximate constant power hyperbola composed of two straight lines with different slopes, such as figure 2 Shown: When the load pressure exceeds the starting pressure of the main pump, it will automatically adjust along the characteristic curve dcb. The load changes durin...

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Problems solved by technology

[0005] from Figure 4 It can be found that although the PID closed-loop control has obvious effects, the control accuracy is not very good

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