Construction Machine Engine Idle Speed Control
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Solution Overview
Problem
Construction machines experience engine failures when operating in high ground with low atmospheric pressure, leading to increased fuel consumption due to excessive engine rotational speed and reduced output torque, which is not effectively managed by existing control systems.
Innovation Solution
The system sets the engine's output torque characteristic based on detected atmospheric pressure, intake air temperature, and fuel temperature, allowing for a low idle rotational speed that exceeds the hydraulic pump's maximum torque, with optional switching based on work state and operator input to prevent engine failure and optimize fuel use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the engine rotational speed is increased to prevent engine failure in low atmospheric pressure environments, then the engine output torque is maintained, but fuel consumption increases unnecessarily
Solution Approach 1:
The patent implements dynamic adjustment of the low idle rotational speed based on real-time detection of atmospheric pressure, intake air temperature, and fuel temperature. The control device modifies the engine's idle speed characteristics according to environmental conditions, transitioning from a fixed idle speed system to a dynamic one that adapts to changing operating conditions, thereby preventing engine failure while minimizing unnecessary fuel consumption.
Solution Approach 2:
The patent changes the key parameter of idle rotational speed based on detected environmental parameters (atmospheric pressure, intake air temperature, fuel temperature). By adjusting the low idle rotational speed threshold according to these parameters, the system optimizes the balance between preventing engine failure and reducing fuel consumption in high ground environments.
2Reliability
If the absorbing torque of the hydraulic pump is reduced to match reduced engine output torque, then engine failure is prevented, but work efficiency may be compromised
Solution Approach 1:
The system dynamically adjusts the low idle rotational speed based on both environmental conditions and hydraulic pump load requirements. When hydraulic work is being performed, the system maintains appropriate engine output by adjusting idle speed accordingly, ensuring work efficiency is not compromised while still preventing engine failure.
Solution Approach 2:
The control device continuously monitors atmospheric pressure, intake air temperature, fuel temperature, and hydraulic pump absorbing torque, using this feedback to dynamically adjust the low idle rotational speed. This closed-loop control ensures the engine operates within safe parameters while maintaining sufficient output torque for hydraulic work.
3Use of energy by moving object
If the low idle rotational speed is set based on detected environmental parameters, then fuel consumption is optimized, but the control system complexity increases
Solution Approach 1:
The control device performs multiple functions: it monitors atmospheric pressure, intake air temperature, and fuel temperature; calculates adjusted low idle rotational speed based on these parameters; and manages engine output torque characteristics. By consolidating these diverse functions into a single control device, the system achieves optimized fuel consumption without proportionally increasing overall control system complexity.
Data Source
AI summary
Provided is a construction machine configured so as to prevent wasteful fuel consumption by preventing an engine stall by means of the injection of an appropriate amount of fuel. A backhoe which is a construction machine in which a hydraulic pump is driven by power from an engine is configured so that the output torque characteristics of the engine is set on the basis of the atmospheric pressure detected by an atmospheric pressure sensor which is an atmospheric pressure detection means, and so that a rotational speed is set so that the maximum torque of the engine at a low idle rotational speed is greater than the maximum absorption torque of the hydraulic pump.