Air Mass Sensor Heater Diagnostics via Temperature Feedback
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Solution Overview
Problem
Existing air mass sensors with auxiliary heaters face challenges in detecting the proper functioning of the heater, leading to potential contamination of the sensor area and subsequent degradation of measurement accuracy, which can result in unusable values if not addressed during regular maintenance.
Innovation Solution
A method and control unit system that activate the auxiliary heater for a predefined time period, measuring temperature before and after activation, and assessing the temperature difference to determine its functionality, allowing for early detection of heater failures and preventing contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the auxiliary heater is activated to prevent contamination of the sensor area, then the sensor cleanliness is improved, but the ability to detect heater failure is worsened because conventional methods only check signal presence without verifying actual heater activation
Solution Approach 1:
The patent implements a feedback mechanism where the control unit monitors temperature information from the sensor area both before and after auxiliary heater activation. This temperature feedback allows the system to verify whether the heater actually functioned, rather than merely checking for signal presence. The control unit compares temperature differences to determine heater status, providing reliable detection of heater failures.
Solution Approach 2:
The air mass sensor performs self-diagnostics by using its own temperature sensing capabilities to monitor the auxiliary heater's functionality. The sensor area's temperature information serves dual purposes: it measures air mass during normal operation and verifies heater activation during diagnostic modes, eliminating the need for separate detection systems.
2Reliability
If temperature measurement is used to detect auxiliary heater functionality, then the reliability of failure detection is improved, but the device complexity increases due to additional measurement and evaluation requirements
Solution Approach 1:
The patent makes the existing temperature sensor in the air mass sensor multi-functional. The same sensor that measures air mass during normal operation is also used to detect auxiliary heater functionality during diagnostic modes. This eliminates the need for additional temperature sensors or dedicated detection hardware, reducing overall device complexity while maintaining reliable failure detection.
Solution Approach 2:
The patent combines the air mass measurement function and the heater diagnostic function into a single integrated system. The control unit handles both normal air mass measurement operations and diagnostic temperature monitoring, merging what could be separate systems into one unified control architecture that shares hardware resources and processing capabilities.
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 early detection of auxiliary heater failures, preventing unscheduled repairs and ensuring accurate air mass measurements by determining the heater's functionality through temperature changes, thus maintaining sensor cleanliness and reliability.
Implementation Method 1
an auxiliary heater, which may be operated in such a way that thermogradient eddies are formed in the area of the auxiliary heater, which result in precipitates of contamination in the air flow
Implementation Method 2
gathering and transmitting a first piece of temperature information before the activation of the auxiliary heater operating mode and a second piece of temperature information via the signal line after expiration of the predefined time period
Data Source
AI summary
For diagnosing a proper functioning of an auxiliary heater in an air mass sensor in an engine system including an internal combustion engine, the auxiliary heater being used for preventing contamination of a sensor area, the air mass sensor communicating air mass information via a signal line during a sensor operating mode and, if a specified state on the signal line is detected, activating the auxiliary heater, the following are performed: setting the state of the signal line to the specified state for a predefined time period in an auxiliary heater operating mode; transmitting a first temperature information before the activation of the auxiliary heater operating mode and a second temperature information via the signal line after expiration of the predefined time period; and detecting the proper functioning of the auxiliary heater depending on the difference between the first temperature information and the second temperature information.