SCR Sensor Module With Universal Electrical Interface
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Solution Overview
Problem
Existing systems for selective catalytic reduction of NOx in internal combustion engines are unable to effectively measure both temperature and urea quality at the point closest to the urea injection point, leading to inefficiencies in the SCR system.
Innovation Solution
A module with a combined temperature and urea quality sensor on a base plate, which can be replaced by a temperature sensor, allowing for flexible configuration without requiring substantial modifications to the module or ECU, and enabling interchangeable sensors with the same footprint or minimal production changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a combined quality and temperature sensor is placed on the base plate to save space, then measurement capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The electrical interface is designed to support both combined quality and temperature sensors as well as temperature-only sensors, making it universal. The interface can alternatively connect to different sensor types without requiring redesign, allowing the system to adapt to different customer requirements while maintaining the same base plate structure
Solution Approach 2:
The system allows dynamic configuration where the sensor type can be changed based on customer requirements. The electrical interface is designed to alternatively connect to different sensor types, enabling the system to adapt between combined sensors and temperature-only sensors without substantive modifications to the module
2Adaptability or versatility
If a combined quality and temperature sensor is used, then measurement functionality is improved, but manufacturing cost increases
Solution Approach 1:
The electrical interface is designed with universal compatibility to alternatively connect to both combined quality and temperature sensors and temperature-only sensors. This allows customers to choose the appropriate sensor type based on their needs, and enables manufacturers to produce modules that can accommodate different sensor configurations without requiring different electrical interfaces or substantial redesign
Solution Approach 2:
The sensor functionality is segmented into optional components. The base plate and electrical interface remain standard, while the sensor type (combined or temperature-only) can be selected and connected accordingly. This segmentation allows customers to pay only for the functionality they need while maintaining compatibility with the same base module
3Device complexity
If sensors are placed off the base plate to simplify the module, then device complexity is reduced, but measurement precision at the injection point deteriorates
Solution Approach 1:
The electrical interface on the base plate is designed to alternatively connect to different sensor types including combined quality and temperature sensors. This universal interface design allows the system to maintain simplicity in the base plate structure while still supporting high-precision measurements at the injection point when combined sensors are used
Data Source
AI summary
It is proposed a module for an SCR system, the module having a base plate (110) with a socket and a combined temperature and urea quality sensor (101) mounted in the socket, the module further comprising an electrical interface connected to the combined temperature and urea quality sensor (101). The electrical interface is such that it is also adapted to alternatively connect to a temperature sensor.