Internal Combustion Engine Control Device for Lean Combustion Stability
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Solution Overview
Problem
Existing engine control technologies face challenges in achieving desired lean combustion across various environment conditions due to difficulties in maintaining the in-cylinder temperature at the inflection point, leading to inefficient NOx reduction and combustion stability.
Innovation Solution
An internal combustion engine control device that includes a fuel injection device and an ignition device, with a temperature control unit managing the intake side air temperature based on the compression ratio, allowing for optimal ignition and injection timing adjustments to ensure stable lean combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the in-cylinder temperature is controlled to be higher than the inflection point temperature to achieve uniform lean combustion, then combustion uniformity is improved, but the in-cylinder temperature cannot reach the target temperature during actuator operation, causing combustion failure
Solution Approach 1:
The patent applies preliminary action by controlling the intake air temperature in advance before combustion occurs. The temperature control unit adjusts the intake air temperature based on the compression ratio, ensuring that when combustion happens, the in-cylinder temperature reaches the required inflection point temperature even during actuator operation. This advance preparation resolves the contradiction by enabling combustion uniformity while maintaining reliability through proactive temperature management.
2Object-generated harmful factors
If the air ratio is increased to reduce NOx generation during lean combustion, then NOx emissions are reduced, but fuel consumption increases and combustion stability deteriorates
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the intake air temperature based on the compression ratio. By controlling the temperature parameter, the system optimizes the combustion process to achieve lean combustion with reduced NOx emissions while maintaining fuel efficiency. The temperature control unit modifies thermal conditions to enable stable combustion at higher excess air ratios, resolving the contradiction between NOx reduction and fuel consumption.
3Device complexity
If the intake air temperature is not controlled, then the system is simpler, but the in-cylinder temperature cannot reach the target temperature under various operation conditions
Solution Approach 1:
The patent applies feedback by implementing a temperature control unit that monitors and adjusts intake air temperature based on the compression ratio. This feedback mechanism enables the system to adapt to various operation conditions automatically. The control unit receives compression ratio information and adjusts temperature accordingly, providing adaptability across different operating scenarios while maintaining relatively simple system architecture through intelligent control.
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
This solution enables the realization of desired lean combustion in various conditions, reducing NOx emissions and fuel consumption while maintaining combustion stability near the lean combustion limit, even at higher excess air ratios.
Implementation Method 1
a temperature control unit which controls an intake side air temperature of the internal combustion engine in response to a compression ratio of the combustion chamber
Data Source
AI summary
The invention provides an internal combustion engine control device capable of performing a stable combustion at a lean combustion limit. In an internal combustion engine control device that controls an internal combustion engine provided with an ignition device igniting an air-fuel mixture formed inside a combustion chamber, an intake side air temperature of the internal combustion engine is controlled in response to a compression ratio of the combustion chamber.