Engine Control System Decoupling Combustion Parameter Deviations

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing engine control systems face interference between performance parameters when calculating target values independently, leading to deviations in other parameters, and struggle to optimize combustion noise and smoke emissions simultaneously.

Innovation Solution

An engine control apparatus that determines target combustion parameters, calculates deviations, and selectively adjusts controlled parameters based on sensitivity and correlation to minimize deviations, optimizing combustion states without sacrificing responsivity or stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If the engine control system calculates target values of performance parameters independently and changes controlled parameters simultaneously, then each performance parameter can be optimized individually, but interference occurs between parameters causing deviations when one reaches target value

Engineering Contradiction:

Improveperformance parameter optimizationVSAvoidparameter consistency

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent segments the control process into two stages: first calculating target combustion parameters based on performance parameter target values, then calculating controlled parameter changes based on combustion parameter deviations. This segmentation prevents interference between performance parameters by decoupling their optimization paths.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent introduces combustion parameters as intermediary variables between performance parameters and controlled parameters. By using combustion parameters as a mediator, the system can optimize performance parameters independently while maintaining consistency through the combustion parameter layer, eliminating direct interference between performance parameters.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If the pilot-to-main injection interval is decreased to reduce combustion noise, then combustion noise is reduced, but smoke emissions increase

Engineering Contradiction:

Improvecombustion noiseVSAvoidsmoke emissions

Core Design Contradiction:

Object-affected harmful factorsVSObject-generated harmful factors

Solution Approach 1:

The patent changes the control approach from directly adjusting injection timing parameters to adjusting controlled parameters (fuel injection quantity, injection pressure, etc.) based on combustion parameter deviations. This allows simultaneous optimization of combustion noise and smoke emissions by using combustion parameters as intermediaries to guide parameter adjustments.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS9169792B2Engine control system with actuator control

Publication Date: 2015.10.27 DENSO CORP

AI summary

An engine control apparatus works to determine target values of a plurality of combustion parameters which represent combustion states of fuel in a combustion engine and are needed to achieve required performances of the combustion engine, calculate a combustion parameter deviation that is a deviation of an actual value of each of the combustion parameters from the target value thereof, select at least one of controlled parameters correlating with the combustion parameters as a function of a degree of a selected one of the combustion parameter deviations for minimizing the selected one of the combustion parameter deviations. The controlled parameters are parameters for controlling operations of actuators working to control the combustion states of the combustion engine. The engine control apparatus controls the one of the controlled parameters, as selected by the controlled parameter selector, to minimize the selected one of the combustion parameter deviations.