Exhaust PM Trap Removal Detection Using Temperature Rate Change
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional anti-theft devices for exhaust after-treatment systems in internal combustion engines cannot detect the removal of the system from the exhaust pipe without cutting the electrical wiring of the temperature sensor.
Innovation Solution
A control device for an internal combustion engine that calculates the temperature of exhaust flowing into and out of the exhaust after-treatment system, and uses the difference in the rate of change over time of these temperatures to determine if the system has been removed from the exhaust pipe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional anti-theft devices use electrical wiring cutting detection, then they can detect removal of the exhaust after-treatment system, but they fail to detect removal when the electrical wiring is not cut
Solution Approach 1:
The patent changes the detection parameter from electrical wiring integrity to exhaust temperature characteristics. By monitoring the temperature of exhaust gas before and after the after-treatment system and analyzing its rate of change, the system can detect removal regardless of whether electrical wiring is cut or intact, thereby improving both detection accuracy and coverage
Solution Approach 2:
The patent replaces the mechanical/electrical detection method (wiring cutting detection) with a thermal detection method (exhaust temperature monitoring). This substitution allows detection based on physical thermal properties of exhaust gas rather than electrical circuit integrity, enabling detection in cases where wiring remains intact but the system is removed
2Ease of operation
If the exhaust after-treatment system is removed without cutting electrical wiring, then the physical connection remains intact, but the functional detection capability is lost
Solution Approach 1:
The patent shifts from measuring electrical connection parameters to measuring thermal parameters (exhaust temperature and its rate of change). This allows the system to maintain ease of operation with intact wiring while regaining removal detection capability through thermal field measurements that reflect the actual presence or absence of the after-treatment system
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 accurate detection of the removal of the exhaust after-treatment system from the exhaust pipe, improving security and reliability of the anti-theft mechanism.
Implementation Method 1
the problem that if the exhaust after-treatment system is removed from the exhaust pipe without cutting the electrical wiring of the temperature sensor, it is not possible to detect the removal of the exhaust after-treatment system from the exhaust pipe. The present invention was made focusing on such a problem and has as its object to utilize a heat capacity of an exhaust after-treatment system to detect if the exhaust after-treatment system has been removed from the exhaust pipe.
Data Source
Figure 1
Figure 2(A)~2(D)
Figure 3(A)~3(D)
AI summary
A control device (200) comprising a first exhaust temperature calculation part calculating a temperature of exhaust flowing into a PM trapping device (50) as a first exhaust temperature, a second exhaust temperature calculation part calculating a temperature of exhaust flowing out from the PM trapping device (50) as a second exhaust temperature, a rate of change over time calculation part calculating a rate of change over time of the first exhaust temperature and a rate of change over time of the second exhaust temperature, and a judgment part judging if the PM trapping device (50) is in a removed state removed from the exhaust passage (22) based on a difference between the rate of change over time of the first exhaust temperature and the rate of change over time of the second exhaust temperature.