Temperature-Dependent Fuel Injection Ratio Control
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Solution Overview
Problem
Existing methods for operating internal combustion engines during start-up struggle to balance fuel injection between intake manifold and combustion chamber, leading to increased emissions and knocking tendencies due to temperature-dependent inefficiencies in fuel distribution.
Innovation Solution
A method that continuously adjusts the ratio of fuel quantities injected into the intake manifold and combustion chamber based on temperature, allowing for a fluid transition between injection strategies to optimize engine operation, reduce emissions, and prevent knocking and self-ignitions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If fuel is injected solely into the intake manifold during cold start, then mixture carburetion is improved, but wall film formation increases and fuel supply must be increased leading to higher emissions
Solution Approach 1:
The fuel injection system is segmented into two separate injection paths: intake manifold injection and direct combustion chamber injection. This allows the fuel supply to be divided into two quantities (first fuel quantity and second fuel quantity) that can be independently controlled based on temperature conditions, resolving the contradiction between achieving good mixture carburetion and minimizing wall film formation
Solution Approach 2:
The injection strategy changes parameters based on temperature: at lower temperatures, direct injection is increased to reduce wall film formation, while at higher temperatures, intake manifold injection is increased to improve mixture carburetion. This dynamic parameter adjustment optimizes both mixture quality and emission reduction across different operating conditions
2Object-generated harmful factors
If fuel is injected directly into the combustion chamber during cold start, then wall film formation is reduced, but mixture homogenization deteriorates leading to higher emissions
Solution Approach 1:
The fuel injection system is segmented into two separate injection paths: intake manifold injection and direct combustion chamber injection. This allows the fuel supply to be divided into two quantities (first fuel quantity and second fuel quantity) that can be independently controlled based on temperature conditions, resolving the contradiction between reducing wall film formation and achieving good mixture homogenization
Solution Approach 2:
The injection strategy changes parameters based on temperature: at lower temperatures, direct injection is increased to reduce wall film formation, while at higher temperatures, intake manifold injection is increased to improve mixture homogenization. This dynamic parameter adjustment optimizes both wall film reduction and mixture quality across different operating conditions
3Stability of the object's composition
If intake manifold injection is used at higher temperatures, then mixture homogenization is improved, but knocking and self-ignition tendencies increase
Solution Approach 1:
The injection strategy dynamically changes parameters based on temperature: at higher temperatures, direct injection is prioritized to reduce knocking and self-ignition tendencies, while at lower temperatures, intake manifold injection is increased to improve mixture homogenization. This temperature-dependent parameter adjustment resolves the contradiction between mixture quality and combustion stability
4Object-generated harmful factors
If direct injection is used at lower temperatures, then knocking and self-ignition are reduced, but mixture homogenization deteriorates
Solution Approach 1:
The fuel injection system is segmented into two separate injection paths: intake manifold injection and direct combustion chamber injection. This allows the fuel supply to be divided into two quantities (first fuel quantity and second fuel quantity) that can be independently controlled based on temperature conditions, resolving the contradiction between reducing knocking and self-ignition and achieving good mixture homogenization
Solution Approach 2:
The injection strategy dynamically changes parameters based on temperature: at lower temperatures, direct injection is prioritized to reduce knocking and self-ignition tendencies, while at higher temperatures, intake manifold injection is increased to improve mixture homogenization. This dynamic parameter adjustment optimizes both combustion stability and mixture quality across different operating conditions
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 reduces undesired emissions and knocking tendencies by optimizing fuel distribution according to temperature, minimizing the need for increased fuel injection and ensuring better air-fuel mixture homogenization, thereby improving engine performance and efficiency during start-up.
Implementation Method 1
Fuel that is introduced into the intake manifold during the start of the internal combustion engine with a cold engine deposits on the walls of the intake manifold, does not fully evaporate, and therefore does not take part in the starting combustions
Implementation Method 2
a direct injection during the intake stroke of the internal combustion engine leads to reduced temperatures in the cylinder due to the evaporation of the fuel in the combustion chamber, and thus to lower knocking and self-ignition tendencies
Data Source
AI summary
In a method for operating an internal combustion engine, a setpoint fuel quantity to be injected is subdivided into a first fuel quantity which is to be injected into an intake manifold of the internal combustion engine, and a second fuel quantity to be injected directly into a combustion chamber of the internal combustion engine. The subdivision of the fuel quantity is performed as a function of a temperature that is characteristic for the operation of the internal combustion engine, e.g., in a start of the internal combustion engine, and the ratio between the first fuel quantity and the second fuel quantity is continually modified as a function of the temperature.