Exhaust Gas Sensor Heating Diagnosis via Power Monitoring
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Solution Overview
Problem
Existing methods for diagnosing the function of exhaust gas sensors are not reliable, as they fail to accurately determine if the sensor has reached the necessary operating temperature during the heating phase, leading to incorrect classification of sensors as faulty or intact.
Innovation Solution
A method that compares the necessary heating power with the available heating power during the heating phase to determine if the exhaust gas sensor has reached the predefined operating temperature for a sufficient time, using temperature sensors and control devices to ensure accurate diagnosis by determining the heating power requirements based on characteristic diagrams or physical models.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the exhaust gas sensor is heated during a heating phase to reach operating temperature, then the sensor can perform regeneration and measurement functions, but the diagnosis reliability is insufficient because it cannot accurately determine whether the sensor has reached the necessary operating temperature
Solution Approach 1:
The patent implements a feedback mechanism by continuously monitoring the heating power consumption during the heating phase and comparing it with the necessary heating power calculated from characteristic diagrams or physical models. This feedback loop enables accurate determination of whether the sensor has reached operating temperature, thereby improving diagnosis reliability without requiring additional temperature sensors.
Solution Approach 2:
The patent replaces direct temperature measurement (mechanical/physical sensing) with an indirect measurement method based on electrical power consumption monitoring. By substituting the temperature sensor approach with heating power analysis, the system achieves accurate temperature status determination while avoiding the limitations of temperature measurement precision.
2Reliability
If a temperature sensor is used to monitor the heating phase, then the operating temperature can be detected, but the device complexity increases
Solution Approach 1:
The patent utilizes the existing heating element as a dual-purpose component: it both heats the sensor and serves as an indirect temperature indicator through its power consumption characteristics. This self-service approach eliminates the need for separate temperature sensing hardware, maintaining reliability while avoiding increased device complexity.
Solution Approach 2:
The heating element is given a multi-functional role: it performs the primary heating function and simultaneously serves as an indirect temperature monitoring device. By making the heating element universal, the patent avoids adding dedicated temperature sensors, thus preventing device complexity increase while maintaining detection reliability.
3Reliability
If the heating power is increased to ensure operating temperature is reached, then the regeneration process is more reliable, but the energy consumption increases
Solution Approach 1:
The patent implements dynamic heating power adjustment by continuously comparing the actual heating power with the necessary heating power derived from characteristic diagrams or physical models. The system adapts the heating power in real-time based on the sensor's thermal state and environmental conditions, ensuring reliable regeneration while minimizing energy consumption through optimized power delivery.
Solution Approach 2:
The patent changes the heating power parameter dynamically during the heating phase based on calculated requirements. By adjusting the power level according to the difference between actual and necessary heating power, the system ensures reliable temperature achievement while avoiding excessive energy consumption that would result from fixed high-power heating.
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
This approach allows for reliable detection of faulty or intact exhaust gas sensors by ensuring sufficient heating power is available to reach the operating temperature, preventing incorrect diagnoses and ensuring successful regeneration and measurement phases.
Implementation Method 1
the exhaust gas is at least temporarily brought to an operating temperature during a heating phase by heating with an electric heater
Implementation Method 2
This can easily be monitored by using a temperature sensor and measuring the time
Data Source
AI summary
A method for diagnosing the function of an exhaust gas sensor in an exhaust gas. The function is evaluated here according to whether during a heating phase an operating temperature of the exhaust gas sensor has been reached for a predefined time period. It is taken into account here whether during the heating phase sufficient heating power has been available to carry out a successful heating phase.