Engine Fuel Injection Control Using Exhaust Gas Parameters
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Solution Overview
Problem
Existing engine fuel injection control systems face challenges in accurately controlling combustion states due to the minute amount of fuel in pilot injections, leading to unstable combustion and emission quality issues, as they require labor-intensive mapping and expensive cylinder pressure sensors.
Innovation Solution
An engine fuel injection control apparatus that acquires exhaust gas parameters such as temperature, pressure, and constituents to adjust the preliminary sub injection, allowing for precise control of combustion states without relying on conventional maps or cylinder pressure sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If pilot injection with minute fuel amount is used to warm combustion chamber wall and reduce combustion noise, then combustion stability is improved, but detection precision of combustion state becomes difficult due to small pressure changes
Solution Approach 1:
The patent uses exhaust gas parameters (temperature, pressure, constituents) as intermediary indicators to detect combustion state. Instead of directly measuring minute cylinder pressure changes from pilot injection, the system measures exhaust gas properties that reflect the combustion state, thereby solving the detection precision problem while maintaining combustion stability
Solution Approach 2:
The patent replaces the mechanical/cylinder pressure-based detection system with a thermal/chemical detection system using exhaust gas parameters. By substituting cylinder pressure sensors with exhaust gas temperature and composition measurements, the system overcomes the limitation of detecting small pressure changes while maintaining accurate combustion state monitoring
2Manufacturing precision
If cylinder pressure sensor is used to detect combustion state for adjusting pilot injection, then combustion control precision is improved, but manufacturing cost increases due to expensive sensor
Solution Approach 1:
The patent uses exhaust gas parameters that are already available from the exhaust system rather than requiring expensive dedicated sensors. This approach uses existing system components to achieve combustion control precision, significantly reducing manufacturing costs while maintaining control accuracy
Solution Approach 2:
The patent makes the exhaust system serve multiple functions: it not only expels combustion products but also provides measurement data for combustion state detection. By using exhaust gas parameters for both exhaust and sensing purposes, the system achieves precise combustion control without additional expensive sensors
3Device complexity
If conventional map-based injection pattern is used for every engine operating state, then injection control is simplified, but adaptability to engine characteristic changes over time is reduced
Solution Approach 1:
The patent implements a feedback mechanism where exhaust gas parameters are continuously measured and used to adjust pilot injection patterns in real-time. This feedback loop enables the system to adapt to engine characteristic changes over time while maintaining relatively simple control logic based on standard control algorithms
4Ease of manufacture
If exhaust gas parameters are used to adjust pilot injection instead of cylinder pressure sensors, then manufacturing cost is reduced, but measurement of exhaust parameters requires additional sensing infrastructure
Solution Approach 1:
The patent makes the exhaust system serve dual purposes: exhaust gas expulsion and combustion state sensing. By using the existing exhaust flow and its parameters for measurement, the system avoids adding separate complex sensing infrastructure while reducing manufacturing costs
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 approach enables accurate and efficient control of combustion states, reducing emission irregularities and manufacturing costs by using exhaust gas parameters to adjust the pilot injection, thereby improving combustion stability and emission quality.
Implementation Method 1
acquiring a parameter indicating at least one of a state of an exhaust gas exhausted from the cylinder after the combustion of the fuel and a constituent of the exhaust gas
Implementation Method 2
this pilot injection generates heat in the combustion chamber of each cylinder to warm the inner wall thereof
Data Source
AI summary
An apparatus is provided to control injection of fuel into an engine with a combustion engine. The fuel is injected into the combustion chamber as a preliminary sub injection and a main injection following the preliminary sub injection. The preliminary sub injection repeats one or more times and is less in an amount of the fuel than the main injection. The apparatus comprises acquisition means and a control unit. The acquisition means acquires a parameter showing at least one of a state of an exhaust gas exhausted from the cylinder after the combustion of the fuel and a constituent of the exhaust gas. The control unit includes variably setting means for variably setting a mode of the preliminary sub injection depending on the parameter acquired by the acquisition means.