Single Throttle Valve Control for Electric Supercharger EGR
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing supercharged internal combustion engines with EGR operation require multiple throttle valves, increasing costs and complicating the transition from non-supercharging to supercharging regions, which affects engine response and efficiency.
Innovation Solution
An internal combustion engine configuration with a single throttle valve upstream of the electric supercharger and EGR introduction port, controlled by a device that adjusts air flow rates to optimize compressor pressure ratios and power regeneration, eliminating the need for additional throttle valves and improving supercharging response.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If two throttle valves are provided for EGR operation and supercharging control, then EGR gas concentration and supercharging response are improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the functions of two separate throttle valves into a single throttle valve located upstream of the EGR introduction port. This single throttle valve controls both the fresh air flow rate and the EGR gas concentration by adjusting the pressure differential across the EGR introduction port, thereby reducing device complexity while maintaining supercharging response capability
Solution Approach 2:
The single throttle valve is designed to perform multiple functions: it controls the overall intake air flow rate, regulates the pressure differential for EGR gas introduction, and enables both supercharging and non-supercharging operations. This multi-functionality eliminates the need for separate throttle valves for different operating modes
2Ease of operation
If two throttle valves are arranged for intake air flow rate control, then precise control of fresh air and EGR gas is achieved, but manufacturing cost increases
Solution Approach 1:
The patent merges the control functions of two throttle valves into a single throttle valve that simultaneously manages fresh air flow and EGR gas introduction. The control device adjusts the opening degree of this single valve to achieve the desired balance between fresh air and EGR gas, thereby reducing manufacturing cost while maintaining operational precision
Solution Approach 2:
The control device utilizes parameter changes in the throttle valve opening degree to achieve different control objectives. By varying the opening degree, the system can control both the overall air flow rate and the pressure differential for EGR introduction, eliminating the need for multiple valves with different control ranges
3Quantity of substance
If the throttle valve is arranged upstream of the EGR introduction port, then EGR gas concentration is improved, but the transition response from non-supercharging to supercharging region is delayed
Solution Approach 1:
The single throttle valve is positioned upstream of the EGR introduction port to preliminarily establish the pressure differential needed for EGR gas introduction. This positioning allows the system to quickly transition between operating modes by simply adjusting the throttle valve opening degree, as the pressure differential is already established and ready for rapid EGR gas flow when supercharging is activated
Solution Approach 2:
The system employs dynamic control of the single throttle valve opening degree to adapt to different operating conditions. The control device rapidly adjusts the valve opening in response to supercharging requests, enabling quick transition between non-supercharging and supercharging regions while maintaining appropriate EGR gas concentration through the upstream valve positioning
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 configuration reduces costs and enhances the engine's supercharging response by optimizing air flow adjustments and power regeneration, allowing for efficient transitions between non-supercharging and supercharging regions.
Implementation Method 1
an electric supercharger including an electric compressor arranged in an intake air passage
Implementation Method 2
adjusts an intake air flow rate by adjusting an opening degree of the throttle valve
Data Source
AI summary
An internal combustion engine is provided with: an electric supercharger including an electric compressor; an EGR introduction port formed upstream of the electric compressor; a throttle valve A arranged upstream of the EGR introduction port; and a control device. A throttle valve B other than the throttle valve A is not arranged in the intake air passage. The control device is configured, in a non-supercharging region, to execute a first air flow rate adjustment processing that adjusts an intake air flow rate by adjusting the opening degree of the throttle valve A while driving the electric supercharger to cause a pressure ratio of the electric compressor to approach 1; and a second air flow rate adjustment processing that adjusts the intake air flow rate by adjusting the opening degree of the throttle valve A while not energizing the electric supercharger.