Engine Control Device for Construction Machinery Fuel Efficiency
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Solution Overview
Problem
Existing engine control devices for construction machines face challenges in efficiently reducing fuel consumption and maintaining pump flow volume when switching between operation modes, often resulting in decreased workload and discomfort due to discontinuous engine speed changes.
Innovation Solution
An engine control device that dynamically adjusts the second target engine speed based on the first target engine speed, allowing for a variable reduction range and ensuring sufficient pump absorption torque, thereby improving fuel efficiency and maintaining pump flow volume without operator discomfort.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the engine speed is reduced to improve fuel consumption, then fuel efficiency is improved, but the pump flow volume becomes insufficient
Solution Approach 1:
The patent applies dynamics by making the second target engine speed variable rather than fixed. The control device dynamically adjusts the second target engine speed based on the detected pump capacity and the first target engine speed, allowing the system to optimize fuel consumption while ensuring sufficient pump flow volume under different working conditions.
Solution Approach 2:
The patent changes the parameter of target engine speed from a fixed value to a variable value that depends on pump capacity and first target engine speed. By calculating the second target engine speed as a function of these parameters, the system can adaptively balance fuel efficiency and pump flow requirements.
2Loss of energy
If the second target engine speed is set lower than the first target engine speed to improve fuel efficiency, then fuel consumption is reduced, but the pump absorption torque becomes insufficient
Solution Approach 1:
The patent uses feedback by detecting the pump capacity and using this information to calculate the appropriate second target engine speed. The control device continuously monitors pump capacity and adjusts the second target engine speed accordingly, ensuring that pump absorption torque remains sufficient while optimizing fuel consumption.
Solution Approach 2:
The patent applies preliminary action by calculating the second target engine speed in advance based on the detected pump capacity and first target engine speed, before the engine actually operates at that speed. This allows the control device to proactively ensure sufficient pump absorption torque while preparing for fuel-efficient operation.
3Loss of time
If the engine speed is changed discontinuously to reach the target speed quickly, then response time is improved, but operator comfort deteriorates
Solution Approach 1:
The patent applies periodic action by implementing continuous, incremental adjustments to the engine speed toward the second target engine speed rather than a single discontinuous change. The control device repeatedly adjusts the speed in small steps, which reduces operator discomfort from noise and vibration while still achieving the target speed efficiently.
Data Source
AI summary
A first target engine speed is set in response to a command value commanded by a command unit. A second target engine speed equal to or lower than the first target engine speed is set based on the first target engine speed. When the first target engine speed is reduced, the second target engine speed is set to be constant or be decreased and a reduction range for decreasing the first target engine speed to the second target engine speed is set to be decreased. The reduction range is set at zero when the first target engine speed is equal to or lower than an engine speed at least at a maximum torque point.