Engine Control Device Exhaust Temperature Deviation Correction

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Solution Overview

Problem

Existing gas engine control devices face challenges in easily calculating correction values due to the need to forcibly increase or decrease the opening degree of the fuel gas supply amount adjustment valve, which is difficult in certain environments.

Innovation Solution

The proposed engine control device corrects the opening degree of a valve adjusting the air-fuel mixture flow rate based on an exhaust temperature deviation, allowing for easier calculation of correction values.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the opening degree of the fuel gas supply amount adjustment valve is forcibly increased or decreased by a predetermined amount to calculate the opening degree correction value, then the combustion variation value can converge to the target value, but the control device cannot be easily used in environments where forced adjustments are difficult

Engineering Contradiction:

Improveconvergence to target combustion variation valueVSAvoidease of use in environments where forced adjustment is difficult

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent changes the control parameter from forced opening degree adjustments to exhaust temperature-based correction values. By monitoring exhaust temperature and calculating correction values based on temperature deviations, the system achieves combustion optimization without requiring forced valve adjustments, thus resolving the contradiction between reliability and ease of operation.

Inventive Principle:

Principle #35Parameter changes

2Measurement precision

If the opening degree is corrected based on target combustion variation value with forced adjustments, then combustion control precision is improved, but the device complexity increases due to the need for forced adjustment mechanisms

Engineering Contradiction:

Improvecombustion variation control precisionVSAvoidcomplexity of forced adjustment mechanism

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces the mechanical forced adjustment system with a thermal-based control system. Instead of mechanically forcing the valve to specific positions, the system uses exhaust temperature measurements to calculate and apply correction values, substituting mechanical complexity with thermal sensing and computational control.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Extent of automation

If forced adjustments are made to calculate opening degree correction values, then the control algorithm can be implemented, but the loss of time occurs due to the complexity of implementation and environmental constraints

Engineering Contradiction:

Improveautomation of correction value calculationVSAvoidtime loss due to implementation complexity

Core Design Contradiction:

Extent of automationVSLoss of time

Solution Approach 1:

The system performs self-correction by continuously monitoring exhaust temperature and automatically calculating correction values without requiring external forced adjustments. The control algorithm uses real-time temperature data to self-adjust the opening degree, eliminating the need for complex forced adjustment procedures and reducing implementation time.

Inventive Principle:

Principle #25Self-service

Data Source

PatentUS12297789B2Engine control device, engine control method, and program

Publication Date: 2025.05.13 MITSUBISHI HEAVY IND ENGINE & TURBOCHARGER LTD

AI summary

Provided is an engine control device for controlling an opening degree of a valve adjusting a flow rate of an air-fuel mixture of an engine, wherein the opening degree is corrected based on an exhaust temperature deviation which is a deviation between a reference value and a current value of an exhaust temperature when controlling the opening degree.