Gaseous Engine Abnormal Combustion Control via Frequency and Intensity

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Solution Overview

Problem

Existing engine devices struggle to effectively suppress abnormal combustion such as preignition, as current methods rely solely on occurrence frequency or pressure increase range, leading to inadequate suppression and potential engine damage.

Innovation Solution

An engine device that detects abnormal combustion in a combustion chamber, monitors the occurrence frequency and intensity, and determines a suppression method by controlling ignition timing, air excess ratio, gaseous fuel shut-off, or switching between gaseous and liquid fuels based on these parameters.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Device complexity

If abnormal combustion suppression is based only on occurrence frequency, then simple control is achieved, but suppression effectiveness deteriorates when occurrence intensity is high

Engineering Contradiction:

Improvecontrol complexityVSAvoidabnormal combustion suppression effectiveness

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The patent changes the control parameters from single-dimension (occurrence frequency only) to multi-dimension (occurrence frequency and occurrence intensity). The control device now monitors both parameters and determines suppression strategies based on their combination, transforming the control approach from simple frequency-based threshold comparison to a more comprehensive two-parameter evaluation system that adjusts suppression actions according to the specific combination of frequency and intensity levels

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements dynamic control by making the suppression strategy adaptive to real-time conditions. Instead of fixed threshold-based control, the system dynamically selects suppression actions based on the current combination of occurrence frequency and occurrence intensity. The control device adjusts ignition timing advancement, fuel injection quantity changes, and other suppression measures according to the specific operational context, creating a flexible and responsive control system

Inventive Principle:

Principle #15Dynamics

2Reliability

If multiple suppression methods are implemented, then abnormal combustion suppression effectiveness is improved, but device complexity increases

Engineering Contradiction:

Improveabnormal combustion suppression effectivenessVSAvoidcontrol system complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent segments the suppression control into distinct functional modules: detection means for monitoring abnormal combustion, frequency analysis means for calculating occurrence frequency, intensity analysis means for calculating occurrence intensity, and control means for executing suppression actions. Each module performs a specific function, and the control device integrates these segmented functions through systematic processing of frequency and intensity data to determine appropriate suppression strategies

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Inventive Principle:

Principle #15Dynamics

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 engine device can more appropriately determine and execute an abnormal combustion suppression method, thereby preventing engine damage and ensuring safe operation by considering both occurrence frequency and intensity.

Implementation Method 1

abnormal combustion occurring inside a combustion chamber is detected, an occurrence frequency and an occurrence intensity of the abnormal combustion are monitored

Methodology Applied

Scientific EffectPressure change detection: Pressure Gradient

Implementation Method 2

at least one of ignition timing of the gaseous fuel, an air excess ratio of intake air in a mixture gas composed of the gaseous fuel and the intake air, shut-off of the gaseous fuel

Methodology Applied

Scientific EffectIgnition timing control: Combustion

Implementation Method 3

an air excess ratio of intake air in a mixture gas composed of the gaseous fuel and the intake air

Methodology Applied

Scientific EffectAir excess ratio control: Combustion

Data Source

PatentUS20250035060A1Engine device and method of controlling engine device

Publication Date: 2025.01.30 YANMAR HLDG CO LTD

AI summary

In an engine device driven by gaseous fuel, abnormal combustion occurring in a combustion chamber of an engine is detected, an occurrence frequency and an occurrence intensity of the abnormal combustion are monitored, and a suppression method for suppressing the abnormal combustion is determined according to the occurrence frequency and the occurrence intensity. At least one of ignition timing of the gaseous fuel, an air excess ratio of intake air in a mixture gas composed of the gaseous fuel and the intake air, and shut-off of the gaseous fuel is controlled as the suppression method in the engine device.