Additive Injection Control for Exhaust System Diagnostics
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Solution Overview
Problem
Current methods for functional testing of motor vehicles with exhaust gas additive injection are inefficient, often requiring excessive amounts of additives, leading to residue accumulation and operational issues, and do not adapt to specific error types, resulting in unnecessary time and effort.
Innovation Solution
An error-dependent test routine is implemented, where the amount and method of additive injection are determined based on the specific error type, allowing for reduced additive usage and optimized testing procedures, including active engine interventions to ensure efficient absorption and minimize residue accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a standardized functional test routine is used for all error types, then the testing procedure is simple to implement, but excessive amounts of additive are consumed leading to residue accumulation
Solution Approach 1:
The patent applies parameter changes by adapting the additive quantity parameter based on the specific error type detected. Different error categories (e.g., injector faults, catalyst issues, sensor problems) are assigned different additive dosages, allowing the test routine to optimize substance consumption while maintaining diagnostic effectiveness. This resolves the contradiction by making the additive quantity variable rather than fixed.
Solution Approach 2:
The test routine transitions from a static, one-size-fits-all approach to a dynamic, error-adaptive procedure. The system dynamically determines the appropriate additive quantity based on the detected error type, enabling the testing process to adjust its resource consumption in real-time according to diagnostic needs, thereby reducing unnecessary additive usage.
2Reliability
If high amounts of additive are injected during functional testing, then the test can be performed for all error types, but residue accumulation occurs in the exhaust system
Solution Approach 1:
The patent changes the additive quantity parameter according to the specific error type being tested. By categorizing errors and assigning appropriate dosage levels, the system maintains sufficient additive for reliable fault detection while avoiding excessive amounts that would cause harmful residue accumulation in the exhaust system.
Solution Approach 2:
The patent applies partial action by injecting only the necessary amount of additive required for each specific error type rather than using a uniform excessive amount for all errors. This ensures adequate testing coverage for diagnostic reliability while preventing harmful over-dosing and residue buildup.
3Ease of manufacture
If a standardized test routine is used regardless of error type, then the procedure is easy to implement, but unnecessary time and effort are consumed
Solution Approach 1:
The patent segments the functional test routine into error-specific sub-routines with different additive quantities. By dividing the testing process into categories (injector faults, catalyst issues, sensor problems, etc.), each with optimized parameters, the system reduces unnecessary testing steps and additive injection time for specific error types while maintaining comprehensive diagnostic coverage.
Solution Approach 2:
The system changes testing parameters including additive quantity and injection timing based on the detected error type. This parameter adaptation allows the test routine to focus resources on the specific fault area, reducing overall testing time and effort compared to a standardized approach that uses the same parameters for all errors.
4Reliability
If excessive additive is injected during functional testing, then all error types can be covered, but operational disruptions occur due to overdose
Solution Approach 1:
The patent changes the additive dosage parameter according to the specific error type to prevent overdose. By matching the additive quantity to the diagnostic requirements of each error category, the system maintains accurate fault detection while avoiding harmful effects on vehicle operation such as exhaust system contamination or catalyst damage.
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 reduces additive waste, minimizes operational disruptions, and ensures safe and reliable vehicle operation by adapting testing to specific error types, thereby avoiding overdose and residue issues while maintaining efficient testing processes.
Implementation Method 1
introducing an additive into an exhaust gas stream
Data Source
Figure 1
AI summary
The invention relates to a method for functionally testing a feature of a motor vehicle, a correspondingly configured control unit, and a motor vehicle equipped therewith. The method is applied to a motor vehicle with an internal combustion engine and a feature in which, under normal, fault-free conditions, an additive is introduced into the exhaust stream of the motor vehicle after a fault has been detected. In this method, the quantity of the additive to be used for the functional test is determined based on a predefined allocation that assigns different quantities of the additive to different faults, depending on the specific fault. The functional test is then performed by introducing the quantity of additive determined for the respective fault in order to ascertain whether the fault persists.