On-Board Diagnostic Signal Filtering for Dynamic Driving Stability
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Solution Overview
Problem
Conventional on-board diagnostic functions in motor vehicles are often aborted or provide unreliable results when the driver engages in dynamic driving modes, leading to impaired exhaust gas values and insufficient diagnostic frequency.
Innovation Solution
A method and system that utilize a control unit with filtering and analysis modules to stabilize on-board diagnostic functions by adapting damping parameters based on driving behavior, employing artificial intelligence algorithms to ensure reliable diagnostic results even in dynamic conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If on-board diagnostic functions are performed during dynamic driving modes, then diagnostic frequency is improved, but diagnostic reliability deteriorates due to unstable operating conditions
Solution Approach 1:
The patent implements dynamic adaptation of diagnostic parameters based on real-time driving conditions. The control unit continuously monitors operating parameters (engine speed, load, temperature) and adjusts diagnostic timing and thresholds accordingly, allowing diagnostics to be performed across a wider range of operating conditions while maintaining reliability through parameter adaptation.
Solution Approach 2:
The patent changes diagnostic parameters dynamically based on operating conditions. Instead of requiring fixed operating points, the system adjusts diagnostic thresholds, sampling rates, and evaluation criteria according to current engine speed, load, and temperature, enabling reliable diagnostics during dynamic driving modes.
2Reliability
If on-board diagnostic functions are aborted during dynamic operating modes, then diagnostic reliability is improved, but diagnostic frequency deteriorates
Solution Approach 1:
The system transitions from static diagnostic execution (aborted during dynamic modes) to dynamic diagnostic execution (adapted to driving conditions). The control unit evaluates real-time operating parameters and determines appropriate diagnostic timing, allowing diagnostics to proceed during previously excluded dynamic conditions when parameters indicate stability.
Solution Approach 2:
The system performs preliminary evaluation of operating conditions before initiating diagnostics. By pre-assessing whether current conditions are suitable for reliable diagnosis based on monitored parameters, the system can proactively start or abort diagnostics without waiting for fixed operating point conditions, improving both frequency and reliability.
3Productivity
If multiple diagnostic attempts are performed during dynamic driving, then diagnostic frequency is improved, but exhaust gas values deteriorate due to impaired fresh air supply
Solution Approach 1:
The system uses feedback from monitored operating parameters (air mass flow, engine load, exhaust gas values) to control diagnostic execution. When exhaust gas values indicate impaired fresh air supply, the control unit receives feedback and adjusts or terminates diagnostic attempts, preventing deterioration of exhaust gas performance while maintaining diagnostic frequency within acceptable limits.
Solution Approach 2:
Instead of performing complete diagnostic sequences repeatedly during dynamic driving, the system applies partial diagnostic actions - performing only those diagnostic steps that do not compromise exhaust gas values. This allows some diagnostic functionality to proceed while avoiding the harmful effects of excessive diagnostic attempts.
Data Source
AI summary
A method for performing an on-board diagnostic function in a motor vehicle including at least one drive system, at least one operating element and at least one control unit with a processor, a control module and an on-board diagnostic function module. The method includes the steps of: activating an on-board diagnostic function in the on-board diagnostic function module; supplying a first signal profile (S1) of an operating value (CV) of the operating element to an analysis module; the analysis module analyzing the first signal profile (S1) of the operating value (CV); activating a filtering module in the event of a positive analysis result; and the filtering module filtering the first signal profile (S1) of the operating value (CV) with selected damping parameters (DP) upon activation of the filtering module in order to obtain a filtered second signal profile (S2) of the operating element.