Engine Control Device Combustion Noise Index Feedback
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Solution Overview
Problem
Partial compression-ignition combustion in engines experiences excessive combustion noise due to fluctuating ignition timing, which is challenging to control effectively, especially under transient operations and varying external conditions.
Innovation Solution
A control device for an engine that includes a processor-connected system with sensors to detect in-cylinder pressure, calculate combustion noise index values, and adjust the ignition timing to prevent CI combustion from advancing beyond a calculated limit, thereby reducing excessive noise and improving fuel efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If partial compression-ignition combustion is used to reduce combustion noise, then fuel efficiency is improved, but combustion noise fluctuation occurs due to external factors
Solution Approach 1:
The control device calculates a combustion noise index value based on in-cylinder pressure detected by the sensor, and uses this calculated value to adjust the ignition timing. This feedback mechanism allows the system to respond to actual combustion noise conditions and prevent excessive noise while maintaining fuel efficiency.
Solution Approach 2:
The system dynamically adjusts the ignition timing parameter based on the calculated combustion noise index value. By changing the ignition timing parameter in response to measured combustion conditions, the system optimizes the balance between fuel efficiency and combustion noise control.
2Power
If ignition timing is advanced to improve fuel efficiency, then power output increases, but combustion noise becomes excessive
Solution Approach 1:
The control device continuously monitors in-cylinder pressure and calculates the combustion noise index value, which is then used to adjust ignition timing. This feedback loop prevents excessive combustion noise while maintaining optimal power output by dynamically responding to actual combustion conditions.
Solution Approach 2:
The ignition timing is not fixed but dynamically adjusted based on real-time combustion noise measurements. This dynamic control allows the system to optimize power output while preventing excessive noise under varying operating conditions.
3Object-generated harmful factors
If combustion center-of-gravity timing is controlled to reduce noise, then combustion noise decreases, but control precision is insufficient for transient operations
Solution Approach 1:
The system uses real-time in-cylinder pressure detection and calculates the combustion noise index value to precisely control ignition timing. This feedback mechanism provides accurate control during transient operations by responding to actual combustion conditions rather than relying on predetermined timing tables.
Solution Approach 2:
The system replaces traditional mechanical or table-based timing control with an electronic control system that calculates combustion noise indices and dynamically adjusts ignition timing. This substitution enables more precise and adaptable control during transient operations.
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 system effectively reduces combustion noise and improves fuel efficiency by adjusting the ignition timing based on calculated noise index values, ensuring that both SI and CI knock indices remain within allowable limits, thereby preventing loud combustion noises.
Implementation Method 1
an in-cylinder pressure sensor connected to the combustion chamber and configured to detect pressure inside the combustion chamber
Implementation Method 2
a spark plug disposed in the combustion chamber
Implementation Method 3
a fuel injection valve disposed to be oriented into the combustion chamber
Implementation Method 4
HCCI combustion in which gasoline fuel mixed with air is combusted by self-ignition inside a sufficiently compressed cylinder
Data Source
AI summary
A control device for an engine in which partial compression-ignition combustion including SI combustion performed by forcibly combusting a portion of mixture gas inside a cylinder followed by CI combustion performed by causing the rest of the mixture gas inside the cylinder to self-ignite is executed within a part of an operating range of the engine, is provided. The device includes a detector configured to detect a parameter related to noise caused by the combustion inside the cylinder, a memory configured to store a characteristic defining a relationship between a start timing of the CI combustion and a combustion noise index, and a processor configured to specify a given combustion noise index value based on the detection value of the detector, and control the start timing of the CI combustion.