Engine Load Control Device for Working Vehicles
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Solution Overview
Problem
Conventional engine load control devices for working vehicles fail to balance engine output effectively between traveling and working equipment loads, leading to inadequate power utilization and potential engine stopping during sudden hydraulic load increases.
Innovation Solution
An engine load control device that includes an engine speed detection unit, instruction content detection unit, hydraulic pump load detection unit, and absorption torque control unit, which dynamically adjusts absorption torque of variable capacity hydraulic pumps based on engine speed, operator intent, and hydraulic pump loads to prevent engine stopping and maintain balanced performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the pump capacity on the working equipment side is suppressed to improve traveling performance, then the ability to travel is improved, but the work performance deteriorates
Solution Approach 1:
The patent implements dynamic control of hydraulic pump capacity based on real-time detection of engine load and traveling conditions. The control unit adjusts the pump capacity continuously according to the detected conditions, enabling the system to adapt between traveling and working modes rather than using fixed suppression. This resolves the contradiction by making the capacity adjustment dynamic rather than static.
Solution Approach 2:
The patent employs a feedback mechanism where the control unit detects engine load and traveling conditions, then adjusts pump capacity accordingly. This closed-loop control ensures that the system responds to actual operating conditions, preventing both engine stopping during work and excessive power consumption during travel, thus resolving the performance trade-off.
2Power
If the engine output is allocated to working equipment, then the work capability is improved, but the traveling response deteriorates due to insufficient power for acceleration
Solution Approach 1:
The system dynamically adjusts pump capacity based on detected traveling conditions and engine load. When acceleration is required, the control unit reduces pump capacity to free up engine power for traveling, while maintaining sufficient power for work when needed. This dynamic allocation resolves the power distribution contradiction.
Solution Approach 2:
The patent changes the operating parameters of the hydraulic pump (capacity) based on detected conditions. By adjusting the pump capacity parameter according to engine load and traveling state, the system optimizes power distribution between working equipment and traveling functions, resolving the power allocation contradiction.
3Loss of energy
If the engine speed is maintained at low idle speed, then the fuel consumption is reduced, but the engine torque rise is insufficient to follow abrupt hydraulic load increases
Solution Approach 1:
The control unit detects abrupt increases in hydraulic load and preemptively adjusts pump capacity to prevent engine stopping. By taking preliminary action to reduce pump demand before the engine can stop, the system maintains reliability while allowing the engine to operate at fuel-efficient idle speeds most of the time.
Solution Approach 2:
The system uses feedback from load detection to adjust pump capacity in response to abrupt load changes. This real-time monitoring and adjustment prevents engine stopping during idle operation, maintaining reliability without requiring the engine to operate at higher speeds continuously, thus preserving fuel efficiency.
Data Source
AI summary
An engine load control device is adapted to a working vehicle in which output of an engine is transmitted to drive wheels and to hydraulic actuators including a working equipment hydraulic actuator via a plurality of variable capacity hydraulic pumps. The control device includes an engine speed detection unit that detects an engine speed, an instruction content detection unit that detects contents of instructions of a speed instruction device, a hydraulic pump load detection unit that detects load of at least one load detection hydraulic pump among the variable capacity hydraulic pumps, and an absorption torque control unit. The absorption torque control unit controls absorption torque of at least one control hydraulic pump other than the load detection hydraulic pump based on detection results of the engine speed detection unit, the instruction content detection unit, and the hydraulic pump load detection unit.