Engine Control Device for Construction Machinery
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Solution Overview
Problem
Existing engine control devices for construction machines require frequent operation mode switching to improve fuel efficiency, leading to reduced workload and inefficient pump capacity utilization, especially when switching from high-speed to low-speed operations.
Innovation Solution
An engine control device that adjusts the target engine speed based on the type of hydraulic actuator operated, allowing for efficient fuel consumption and pump capacity utilization by setting a second target engine speed lower than the first target engine speed, with a reduction range determined by the type of hydraulic actuator or combination of actuators, ensuring smooth operation without adverse effects on hydraulic actuator performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the engine speed is reduced to improve fuel efficiency, then fuel consumption is improved, but the maximum speed of working equipment is decreased
Solution Approach 1:
The patent implements dynamic adjustment of target engine speed based on detected pump capacity and operation mode, rather than using a fixed low speed. The control unit dynamically selects between first target engine speed (higher) and second target engine speed (lower) depending on real-time hydraulic pump capacity detection, allowing the engine to adapt its speed to actual workload requirements while optimizing fuel efficiency.
Solution Approach 2:
The patent changes the engine speed parameter dynamically based on detected pump capacity. When pump capacity is below a predetermined threshold, the system switches to a lower target engine speed for fuel efficiency. When pump capacity exceeds the threshold, the system switches to a higher target engine speed to maintain working equipment performance. This parameter change resolves the contradiction by making engine speed adaptive rather than fixed.
2Use of energy by moving object
If operation mode switching is used to improve fuel efficiency, then fuel consumption is improved, but the operator needs to operate mode switching frequently
Solution Approach 1:
The system performs self-service by automatically detecting pump capacity and autonomously selecting the appropriate target engine speed without requiring operator intervention. The control unit continuously monitors pump capacity and automatically switches between operation modes based on detected values, eliminating the need for manual mode switching while maintaining fuel efficiency benefits.
Solution Approach 2:
The patent implements a feedback mechanism where the control unit detects pump capacity and uses this information to automatically adjust target engine speed. The detected pump capacity feeds back to the control unit, which then selects the appropriate operation mode and target speed, creating a closed-loop system that optimizes fuel efficiency without operator involvement.
3Use of energy by moving object
If a fixed low target engine speed is set for fuel efficiency, then fuel consumption is improved, but pump capacity requirements cannot be met for certain hydraulic actuators
Solution Approach 1:
The patent makes the target engine speed dynamic rather than fixed, allowing it to adjust based on detected pump capacity and hydraulic actuator requirements. The system can switch between higher and lower target speeds depending on which hydraulic actuators are operating, ensuring adequate pump capacity is provided when needed while maintaining fuel efficiency during lower-demand operations.
Data Source
AI summary
A first target engine speed is set in response to a command value commanded by a command unit and a second target engine speed lower than the first target engine speed is set based on the first target engine speed. A reduction range from the first target engine speed to the second target engine speed is set according to a type of a hydraulic actuator operated by an operation lever or a combination of plural hydraulic actuators operated by an operation lever.