Exhaust Gas Recirculation Valve Failure Detection via Ignition Advance

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Solution Overview

Problem

The exhaust gas recirculation control valve in spark-ignition engines is prone to fouling and clogging due to its operating environment, leading to issues such as loss of power, acceleration problems, and engine misfires when the valve becomes stuck in the open position.

Innovation Solution

A control device and method that modify the position of the exhaust gas recirculation control valve, calculate theoretical and optimal ignition advances, and use a diagnostic criterion to compare against failure thresholds, thereby detecting blockages in the valve.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the exhaust gas recirculation control valve operates in the exhaust gas environment, then exhaust gas recirculation is achieved to increase resistance to knocking, but the valve becomes fouled and clogged leading to reliability issues

Engineering Contradiction:

Improvevalve operational reliabilityVSAvoidfouling and clogging of valve

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The system performs preliminary diagnostic checks by comparing theoretical ignition advance (from maps) with optimal ignition advance (from knock sensor feedback) to detect valve failures before they cause severe engine damage. This early detection allows preventive maintenance actions to be taken.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system uses knock sensor feedback to continuously monitor engine knocking and adjust ignition advance accordingly. By comparing the feedback-based optimal ignition advance with the map-based theoretical ignition advance, the system detects valve positioning failures and alerts the driver before complete valve failure occurs.

Inventive Principle:

Principle #23Feedback

2Productivity

If the control valve is stuck in the open position, then exhaust gas recirculation continues, but power loss and acceleration problems occur

Engineering Contradiction:

Improveengine power and accelerationVSAvoidvalve position control

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

The system replaces direct mechanical valve position sensing with an indirect diagnostic approach using ignition advance calculations and knock sensor feedback. By substituting mechanical position sensors with computational diagnostics, the system can detect valve sticking without adding complex mechanical sensing components to the harsh exhaust environment.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Reliability

If diagnostic monitoring is implemented to detect valve failures, then reliability is improved, but device complexity increases

Engineering Contradiction:

Improvevalve failure detectionVSAvoiddiagnostic system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The system uses existing engine components (knock sensor, ignition system, ECU) for dual purposes: normal engine control and valve failure diagnosis. The same knock sensor used for knocking detection also provides data for valve position verification, eliminating the need for separate diagnostic hardware and reducing overall system complexity.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

The method effectively detects failures in the exhaust gas recirculation valve, preventing power loss and engine misfires by accurately determining the valve's operational state and signaling failures for driver alert.

Implementation Method 1

the ignition advance management device comprising a knock sensor capable of detecting the occurrence of a knocking phenomenon in the engine

Methodology Applied

Scientific EffectVibration detection: Vibration

Data Source

PatentEP3092403B1Method for controlling the operation of an exhaust gas recirculation valve and internal combustion engine

Publication Date: 2025.06.18 HORSE POWERTRAIN SOLUTIONS S L U

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AI summary

This control device (1) is used to control the operating status of an exhaust gas recirculation device control valve of an internal combustion engine (2). The engine (2) comprises at least one spark plug (9), an ignition-advance management device (10) able to determine an optimum ignition advance and apply it to the spark plug (9), an exhaust gas recirculation device (12) equipped with an exhaust gas recirculation control valve (13). The control device (1) comprises: - first actuating means (17) able to force the opening and closing of the control valve (13), - a map (18) in which theoretical ignition advance values are stored as a function of engine speed and engine load, - first calculating means (19) able to calculate a diagnostics criterion as a function of the theoretical ignition advance determined from the map (18) and of the optimum ignition advance, and - comparison means (21) able to compare the diagnostics criterion against a control valve failure threshold.