Engine Cooling Valve Failure Detection via Pressure Change
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Solution Overview
Problem
Existing engine cooling systems fail to accurately and timely detect failures in the flow rate control valve, leading to potential engine damage from excessive temperature fluctuations.
Innovation Solution
A cooling device equipped with a pressure sensor and a valve control system that determines flow rate control valve failure by analyzing pressure changes when the engine rotation speed is below or above a predetermined threshold, allowing for early and accurate detection through distinct failure determination methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If temperature-based failure determination is used, then the system can detect valve failure, but the detection responsiveness is low and failure cannot be detected immediately
Solution Approach 1:
The invention changes the detection parameter from temperature to pressure. Pressure changes occur immediately when the valve fails, providing instant detection, whereas temperature changes are gradual and delayed. This parameter substitution resolves the contradiction by achieving both immediate responsiveness and accurate failure detection.
2Device complexity
If failure detection is delayed, then the detection system is simpler, but the engine body may excessively rise in temperature and be damaged
Solution Approach 1:
The invention replaces the temperature-based detection mechanism with a pressure-based detection mechanism. The pressure sensor provides immediate feedback when valve failure occurs, enabling timely protective actions before engine damage can occur, thus maintaining high reliability without requiring complex delayed detection systems.
3Loss of time
If failure detection is delayed, then the system response time is reduced, but the temperature of the engine body may excessively lower and combustion may be unstabilized
Solution Approach 1:
The invention implements immediate pressure-based feedback when valve failure is detected. This allows the control system to respond in real-time, adjusting operations to maintain stable combustion and appropriate engine temperature, preventing both excessive temperature rise and excessive temperature drop that would destabilize combustion.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables timely and accurate detection of flow rate control valve failures, preventing engine damage and ensuring stable engine operation by differentiating failure determination based on engine rotation speed.
Implementation Method 1
a pressure sensor for detecting a pressure of cooling water flowing through the cooling water passage
Data Source
AI summary
When an engine rotation speed is lower than a reference rotation speed, first failure determination in which failure of a flow rate control valve is determined based on a pressure change of cooling water detected by a pressure sensor is executed, when a valve closing instruction to switch the flow rate control valve from an opened state to a closed state is output from a valve control device; and when an engine rotation speed is equal to or higher than the reference rotation speed, second failure determination in which failure of the flow rate control valve is determined based on a pressure change of cooling water detected by a pressure sensor is executed, when a valve opening instruction to switch the flow rate control valve from a closed state to an opened state is output from the valve control device.