Backhoe Loader Pump Power Threshold Control Under Variable Load
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Solution Overview
Problem
The hydraulic systems in existing backhoe loaders, whether constant displacement or constant power variable displacement pumps, often fail to fully utilize the engine's power, leading to inefficiencies and potential overloading issues.
Innovation Solution
A method and system for controlling a backhoe loader that adjusts the power upper threshold of a variable displacement pump based on the operating mode and actual load, using a control system to manage power distribution among the traveling, loading, and digging operations, ensuring the engine operates within its maximum efficient range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a constant displacement pump or constant power variable displacement pump is used in the hydraulic system, then the system structure is simple, but the engine power cannot be fully utilized and operating efficiency is low
Solution Approach 1:
The patent employs a variable displacement pump with dynamically adjustable displacement volume, controlled by a control valve. The pump's displacement is continuously adjusted based on real-time hydraulic system pressure and flow demands, enabling the system to adapt to varying operational requirements and fully utilize engine power across different working conditions, thereby resolving the contradiction between structural simplicity and operating efficiency
Solution Approach 2:
The patent changes the key parameter of pump displacement volume from fixed to variable. By adjusting the displacement parameter according to actual hydraulic demands through the control valve, the system optimizes power transmission efficiency and ensures the engine operates within its optimal power range, thus improving operating efficiency without significantly increasing system complexity
2Productivity
If the hydraulic system power is increased to fully utilize engine power, then operating efficiency improves, but the risk of overloading increases
Solution Approach 1:
The patent implements a feedback control mechanism where the control valve continuously monitors hydraulic system pressure and flow conditions. Based on this feedback, the valve automatically adjusts the pump's displacement volume to match actual demands, preventing excessive power transmission that could lead to overloading while ensuring sufficient power availability for efficient operation
Solution Approach 2:
The dynamic adjustment capability of the variable displacement pump allows the system to respond in real-time to changing load conditions. The pump automatically reduces displacement when demand decreases, preventing overloading, and increases displacement when demand rises, maintaining operating efficiency without permanently increasing overloading risk
3Power
If the pump power is increased to meet peak demand, then the system can handle maximum load, but energy consumption increases during light-load operations
Solution Approach 1:
The patent varies the pump's displacement parameter according to actual hydraulic system demands. During light-load operations, the displacement is reduced proportionally, minimizing energy consumption. During peak demand, the displacement increases to meet the power requirements, thus resolving the contradiction between power capacity and energy consumption
Solution Approach 2:
The control valve continuously and periodically adjusts the pump displacement based on real-time hydraulic conditions. This periodic adjustment ensures the pump operates at optimal efficiency points across varying load cycles, reducing energy waste during light-load phases while maintaining adequate power capacity when needed
Data Source
AI summary
The present disclosure relates to a method for controlling a backhoe loader and a backhoe loader, and relates to the field of engineering machinery. The method for controlling a backhoe loader includes: setting a power upper threshold P_0 for a variable displacement pump of the backhoe loader according to an operating mode of the backhoe loader; where the backhoe loader includes an engine, the variable displacement pump, a traveling system, a loading operation system, and a digging operation system; the operating mode includes: a traveling mode, a loading operation mode, and a digging operation mode; and adjusting the power upper threshold P_0 of the variable displacement pump according to an actual load of the backhoe loader in a current operating mode. In the technical solutions, the power upper thresholds P_0 are different in different operating modes. Power of the variable displacement pump is adjusted in real time.