Internal Combustion Engine Air Duct Flow Regulation
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Solution Overview
Problem
Existing internal combustion engine air supply systems face inefficiencies and increased pollutant loads due to the mutual influence of air flowing through separate ducts, which complicates precise regulation and air management across different operating modes.
Innovation Solution
A method and device that utilize separate air ducts for cylinder and heater air supply, with distinct measuring functions for each mode and a parallel arrangement of air ducts to minimize mutual influence, allowing for improved control and regulation of air flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If separate air ducts are used for cylinder and heater air supply, then air management is simplified, but mutual influence between ducts causes measurement inaccuracies
Solution Approach 1:
The air supply system is divided into separate air ducts (first air duct for cylinders, second air duct for heater) with independent flow measurements. This segmentation allows simplified structural design while enabling independent control and measurement of air flows to different components.
Solution Approach 2:
A correction value acts as an intermediary parameter to compensate for mutual influence between air ducts. The correction value is determined based on the air flow through the first air duct and is applied to the measured air flow through the second air duct, thereby eliminating measurement inaccuracies caused by duct interaction.
2Measurement precision
If different measuring functions are used for different operating modes, then regulation accuracy is improved, but device complexity increases
Solution Approach 1:
The measuring function is made dynamic by adapting it to different operating modes (first operating mode with heater off, second operating mode with heater on). The system automatically selects or adjusts the appropriate measuring function based on current operational conditions, thereby maintaining high regulation accuracy without requiring permanently complex measurement systems.
Solution Approach 2:
Different measuring functions are employed for different operating modes, and correction values are applied based on operating mode parameters. This allows the measurement system to optimize its characteristics for each specific operating condition, improving overall accuracy while managing complexity through parameter-based adaptation.
3Temperature
If air flow through second air duct is increased for better heater performance, then exhaust system heating is improved, but combustion efficiency deteriorates due to reduced air availability
Solution Approach 1:
The system uses feedback from air flow measurements through both air ducts to monitor and balance air distribution. By measuring actual air flows and applying correction values, the system can adjust air supply to ensure adequate air reaches the cylinders for efficient combustion while still providing sufficient air to the heater for exhaust system temperature management.
Solution Approach 2:
The system dynamically adjusts air flow parameters in the second air duct based on operating mode and correction values. This allows optimization of heater performance in certain operating modes while maintaining appropriate air supply for combustion in other modes, thereby balancing temperature requirements with combustion efficiency through parameter adaptation.
Data Source
AI summary
A method and a device for operating an internal combustion engine including a first air duct for supplying air to a cylinder and a second air duct for supplying air to a heater for heating an exhaust system. The first and second air ducts each have a control element for controlling the amount of air flowing through them and a mass flow sensor for measuring the amount of air flowing through them. The first and second air ducts are connected to a common air filter, for providing filtered ambient air of the internal combustion engine. A regulation of the amount of air flowing through the first and second air ducts takes place using the measurement signals, depending on operating states of the internal combustion engine. A mutual influence of the air flowing through the first or second air duct is taken into account.