A positive flow control method for an excavator

Abstract

The invention discloses an excavator positive flow control method. The excavator positive flow control method includes the steps that the maximum discharge capacity of a pump is calculated out by collecting pilot pressures and main pressures and carrying out corresponding data processing, wherein the maximum pump discharge of the pump is determined through the pilot pressures and the main pressures; data processing is carried out on the discharge capacity determined by the pilot pressures and the discharge capacity determined by the main pressures, and a better value between the two discharge capacities is selected out; meanwhile, given power of the pump and feedback power of the pump are obtained through real-time data collecting and processing, flow is controlled in real time through a power PID, and the optimal discharge capacity of the pump is obtained by carrying out corresponding operation on the maximum discharge capacity determined by the pilot pressures and the main pressures and the discharge capacity determined by the power PID; finally, corresponding output serves as a driver of an electromagnetic proportional valve to adjust a discharge capacity servo structure of the pump in real time. By means of the excavator positive flow control method, reasonable matching can be carried out between an engine and the pump, between the pump and loads and on expectation of people for the speed of a working device in real time, the optimal discharge capacity of the pump under the real-time working condition is determined, and efficiency and performance of a whole system are greatly improved.

Description

technical field [0001] The invention relates to excavator technology, in particular to an excavator positive flow control method. Background technique [0002] With the continuous development of my country's national economy, hydraulic excavators, as an efficient and economical earthwork construction machinery, play a pivotal role in various engineering construction fields. With the rapid development of computer communication technology, automatic control technology, microelectronics technology, sensor technology and hydraulic technology, as well as increasingly serious resource and environmental problems, people have higher and higher performance requirements for excavators. On the premise of satisfying the basic performance of the excavator, people pay more and more attention to the energy saving, high efficiency, operability and quick response of the system of the excavator. [0003] At present, the commonly used excavator control systems include load sensing control sys...

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Problems solved by technology

[0003] At present, the commonly used excavator control systems include load sensing control system, negative flow control system and positive flow control system. Compared with the former two control systems, the positive flow control system has good speed regulation performance, short system response time and good operability. However, due to the complex and harsh working conditions of the excavator and the unpredictability of the external load, the engine often deviates from the low fuel consumption and the optimal working area, which virtually increases some unfavorable conditions. The necessary power loss increases the fuel consumption of the excavator and reduces the performance of the entire excavator system

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