Electronic Card Leak Protection via Temperature Threshold
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Solution Overview
Problem
Existing nitrogen oxide treatment systems in vehicles face damage due to leaks of reducing agents, such as urea, which can cause excessive heating and chemical reactions on electrical and electronic components within the SCR system.
Innovation Solution
A hydraulic supply circuit with an electrically controlled unit and a temperature sensor on the electronic control card that interrupts power supply if excessive temperature thresholds are reached, indicating a potential leak, and communicates this to the engine's computer to cut off power to prevent further damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the electronic control box includes hydraulic circuit components and electronic components in close proximity, then the system integration and compactness are improved, but the risk of damage from reducing agent leaks to electronic components increases
Solution Approach 1:
The patent introduces a temperature sensor as an intermediary detection device that monitors the thermal state of the electronic control card. This mediator enables indirect detection of reducing agent leaks through temperature measurement, allowing the system to identify harmful conditions without direct contact between the leak source and electronic components, thus resolving the contradiction between integration and safety.
Solution Approach 2:
The system implements a feedback mechanism where the temperature sensor continuously monitors the electronic control card temperature and provides information to the control unit. When the temperature exceeds a predetermined threshold indicating a leak, the control unit responds by interrupting power supply to the hydraulic unit, creating a closed-loop feedback system that protects electronic components while maintaining system integration.
2Reliability
If a temperature sensor and control system are added to detect leaks, then the protection of electronic components is improved, but the device complexity increases
Solution Approach 1:
The electronic control card serves a dual function: it controls the hydraulic unit and simultaneously monitors its own thermal state through the integrated temperature sensor. This self-service approach allows the system to detect leaks and protect itself without requiring separate external monitoring systems, thereby improving reliability while minimizing the increase in device complexity.
Solution Approach 2:
The patent merges the temperature sensing function with the existing electronic control card, combining multiple functions (control and monitoring) into a single integrated unit. This consolidation reduces the need for separate components and interconnections, thereby improving component protection while keeping the overall device complexity increase minimal.
3Reliability
If the temperature threshold is set higher to avoid false alarms, then false detections are reduced, but the response time to actual leaks may be delayed
Solution Approach 1:
The system uses parameter changes (temperature threshold) as the basis for leak detection. By setting the threshold above the maximum normal operating temperature, the system ensures that only actual leaks trigger alarms, eliminating false detections. The threshold is carefully chosen to balance reliability and response time, representing an optimized parameter setting that resolves the contradiction between avoiding false alarms and maintaining rapid response.
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
Effectively detects leaks indirectly through temperature measurement, preventing damage to electronic components and reducing false alarms by setting a temperature threshold higher than the maximum without a leak, thus protecting the system without modifying its architecture.
Implementation Method 1
A temperature sensor for measuring the temperature of this electronic card
Implementation Method 2
These reducing agent leaks can cause damage by heating or by chemical reaction on the electrical and/or electronic components
Implementation Method 3
These reducing agent leaks can cause damage by heating or by chemical reaction on the electrical and/or electronic components
Data Source
Figure 1
AI summary
The invention relates to a system comprising: - a portion of a hydraulic supply circuit for a conductive fluid, this portion of the circuit comprising an electrically controlled hydraulic component, an electronic control board (11) on which is disposed: a temperature sensor (19) for measuring the temperature of this electronic board (11), a control unit (18) connected to the temperature sensor (19) and designed to process the temperature information provided by this sensor, - a housing (8) including the electronic board (11) and the portion of the hydraulic supply circuit, the electronic board (11) being juxtaposed to the portion of the supply circuit, characterized in that the control unit (18) of the board (11) is designed to interrupt the electrical supply to the hydraulic component if the temperature of the board exceeds a predetermined excessive temperature threshold.this temperature threshold being considered indicative of a leak of the liquid on the (11).