Engine Intake Manifold Degradation Diagnosis via Reverse Spinning
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Solution Overview
Problem
Existing methods struggle to accurately diagnose degradation in vehicle engine intake manifolds and exhaust systems, particularly when degradation occurs downstream of sensors, leading to inefficiencies and increased emissions.
Innovation Solution
The method involves spinning the engine unfueled in both forward and reverse directions to measure intake and exhaust air flows, using baseline data to pinpoint sources of degradation in the engine, intake manifold, or exhaust system by comparing air flows with those measured under similar conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manifold absolute pressure is compared to atmospheric pressure to diagnose intake manifold degradation, then intake manifold degradation can be detected, but exhaust system degradation cannot be diagnosed
Solution Approach 1:
The diagnostic system performs multiple diagnostic functions using a single unified approach. By spinning the engine in both forward and reverse directions and comparing intake air flow measurements, the system can diagnose degradation in both the intake manifold and exhaust system, as well as identify engine-specific issues. This multi-functional diagnostic capability resolves the limitation of previous methods that could only detect intake manifold problems.
Solution Approach 2:
The patent applies reverse engineering by spinning the engine in reverse direction to diagnose exhaust system degradation. By reversing the normal engine operation direction and measuring intake air flow, the system can detect exhaust system blockages and degradation that would not be apparent during normal forward operation. This inversion technique allows the same diagnostic methodology to reveal different system conditions.
2Difficulty of detecting and measuring
If traditional diagnostic methods are used, then simple intake manifold issues can be identified, but complex degradation sources involving engine, intake manifold, or exhaust system cannot be pinpointed
Solution Approach 1:
The diagnostic method segments the potential degradation sources into three distinct categories: engine-specific issues, intake manifold issues, and exhaust system issues. By analyzing the pattern of intake air flow measurements during forward and reverse spinning, the system can identify which specific segment or component is degraded, providing precise localization of the problem rather than just detecting general degradation.
Solution Approach 2:
The system uses dynamic testing by spinning the engine in both forward and reverse directions to create different flow conditions through the engine components. This dynamic approach allows the system to observe how air flow responds to changing conditions, revealing degradation patterns that would not be apparent under static or single-direction operation. The dynamic nature of the test enables differentiation between various degradation sources.
Data Source
AI summary
Methods and systems are provided for pinpointing a source of degradation in a vehicle engine system. In one example, a method includes spinning an engine of a vehicle unfueled in a forward and a reverse direction, in no particular order, and recording a first intake air flow and a second intake air flow, respectively, in an intake of the engine, and where the source of degradation is indicated as a function of both the first air flow and the second air flow. In this way, the degradation of the vehicle engine system may be pinpointed as to being located in the intake manifold, the exhaust system, or the engine.