Cooling Water Control Apparatus Valve Failure Detection
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Solution Overview
Problem
Existing cooling water control systems face challenges in accurately determining valve failures due to variations in temperature differences between engine water and bypass water pipes, which can be influenced by heat transfer from exhaust heat recovery equipment, leading to inaccurate failure detection.
Innovation Solution
A cooling water control apparatus that includes a first pipe for circulating cooling water through an engine, a second pipe for bypassing the engine, a valve to adjust flow between the pipes, and an exhaust heat recovery equipment with a controller to manage heat transfer, allowing for precise determination of valve failures by minimizing temperature differences caused by heat transfer variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If exhaust heat recovery equipment is used to transfer heat to cooling water, then energy efficiency is improved, but temperature difference between engine water and bypass water becomes variable leading to inaccurate valve failure detection
Solution Approach 1:
The patent introduces a control unit as an intermediary that mediates between the exhaust heat recovery equipment and the cooling water system. The control unit dynamically adjusts the heat transfer amount based on detected temperature differences, ensuring that heat recovery operations do not interfere with valve failure detection accuracy. This intermediary control mechanism allows both energy efficiency and detection accuracy to coexist.
Solution Approach 2:
The patent changes the parameter of heat transfer amount dynamically based on engine operating conditions and detected temperature differences. By adjusting the heat transfer parameter in real-time, the system maintains accurate valve failure detection while still achieving energy recovery when conditions permit. This parameter adaptation resolves the contradiction between energy efficiency and measurement precision.
2Ease of operation
If temperature difference between engine water and bypass water is used for valve failure determination, then detection simplicity is improved, but detection accuracy deteriorates due to heat transfer interference
Solution Approach 1:
The patent implements a feedback mechanism where the control unit continuously monitors the temperature difference between engine water and bypass water, and uses this feedback information to determine valve failure status. The feedback loop allows the system to distinguish between temperature differences caused by valve failures versus those caused by normal heat transfer operations, maintaining both simplicity and accuracy in detection.
Solution Approach 2:
The patent applies dynamic analysis by considering the temporal and conditional characteristics of temperature differences. Instead of using a static threshold, the system dynamically evaluates temperature differences in the context of current engine operations and heat transfer states. This dynamic approach maintains detection simplicity while improving accuracy by adapting to varying operating conditions.
3Adaptability or versatility
If heat transfer amount in exhaust heat recovery equipment varies with engine load, then adaptability to different operating conditions is improved, but temperature difference stability deteriorates affecting failure detection
Solution Approach 1:
The patent applies preliminary action by having the control unit predict or anticipate temperature difference variations based on expected engine load changes and heat transfer operations. Before conducting valve failure detection, the system prepares by accounting for anticipated temperature variations, allowing it to distinguish between expected and unexpected temperature differences. This preliminary preparation maintains temperature difference stability for detection purposes while preserving adaptability to engine load variations.
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
The system enhances the accuracy of valve failure detection by controlling heat transfer to isolate temperature variations caused by valve states from those caused by heat transfer, ensuring reliable operation of the cooling apparatus.
Implementation Method 1
an exhaust heat recovery equipment located on the second pipe... heat exchange between the exhaust gas and the cooling water is performed
Data Source
AI summary
A cooling water control apparatus is configured to control a cooling apparatus, wherein the cooling apparatus includes: a first pipe in which the cooling water passes through an engine; a second pipe in which the cooling water does not pass through the engine; a valve; and an exhaust heat recovery equipment, the cooling water control apparatus includes: a determining device for performing a determination operation to determine whether or not the valve has failure on the basis of difference between first water temperature and second water temperature; and a controlling device for controlling the cooling apparatus such that transferred heat amount in the exhaust heat recovery equipment decreases with increase of load of the engine or the transferred heat amount is maintained regardless of largeness of the load of the engine, when the determining device performs the determination operation.