Construction Machine Start Control Against Smart Key Noise
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Solution Overview
Problem
Smart key start control systems in construction machines malfunction due to noise interference, leading to unexpected engine shutdowns or startups, posing safety risks.
Innovation Solution
A start control system that includes a vehicle control unit to determine the working or traveling state of a construction machine based on inputs from transmission, main pump, steering pump, and pilot cut-off switch, and maintains the engine state when noise signals are detected during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a smart key start control system is used to enable convenient engine start/stop control, then ease of operation is improved, but reliability deteriorates due to noise interference causing malfunction
Solution Approach 1:
The patent introduces an intermediary verification mechanism that checks whether the construction machine is in a working or traveling state before responding to start switch signals. This intermediary check acts as a mediator between the start switch input and the engine control, preventing noise-induced false operations while maintaining legitimate start commands during actual operation.
Solution Approach 2:
The system implements feedback by continuously monitoring the working/traveling state of the construction machine and using this information to validate start switch signals. The control unit receives feedback about the current operational state and uses it to determine whether to respond to start switch inputs, creating a closed-loop control system that enhances reliability.
2Reliability
If noise blocking circuits are added to prevent interference, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent replaces traditional electronic noise blocking circuits with a logic-based software solution. Instead of using additional hardware filters or shielding, the system uses logical conditions and state verification to distinguish valid start signals from noise, substituting a complex electronic filtering system with a simpler control algorithm.
Solution Approach 2:
The control system performs self-verification by using its own internal state information (working/traveling state) to validate external inputs. The system serves itself by providing the verification mechanism that is needed, eliminating the need for separate external noise blocking components.
3Ease of operation
If the start switch responds immediately to all input signals, then ease of operation is improved, but harmful factors increase due to unexpected engine shutdowns during work or travel
Solution Approach 1:
The system applies preliminary anti-action by preemptively checking the working/traveling state before executing any start switch command. This preliminary verification prevents harmful actions (unexpected engine shutdowns during operation) before they can occur, while still allowing legitimate start commands to proceed.
Solution Approach 2:
The control unit performs preliminary verification of the machine's operational state before responding to start switch signals. This preliminary action ensures that the system is in the correct state to safely process start commands, preventing harmful outcomes while maintaining operational responsiveness.
Data Source
AI summary
The present disclosure relates to a start control system for a construction machine, and a control method thereof, the system comprising: a work device and a travel device of the construction machine, the work device and travel device being mechanically connected to an engine; a start switch controller which receives a signal input to a start switch and converts the start of the engine to an on/off state; and a vehicle control unit which receives information from the work device and the travel device, determines whether the construction machine is working or traveling, and transmits a signal to the start switch controller, wherein, when the vehicle control unit which has determined that the construction machine is working or traveling transmits the signal, the start switch controller determines that the signal input to the start switch is a noise signal and maintains a start state of the construction machine.