Exhaust Valve Control for Engine Back Pressure
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Solution Overview
Problem
Existing engine test systems face challenges in accurately controlling exhaust back pressure during testing, which affects the efficiency and quality of engine performance evaluations, and often require complex and costly exhaust systems.
Innovation Solution
A control system that includes a restriction determination module and a valve control module to adjust the position of an electromechanically-actuated exhaust valve based on desired exhaust back pressure, using intake air and fuel flow rates to determine the necessary adjustments, and includes annular protrusions to enhance back pressure control at low flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If complex exhaust system components like catalytic converters are used to control back pressure, then back pressure control capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the back pressure control function from complex exhaust system components (catalytic converters, mufflers) and implements it through a simple electronically-controlled valve mechanism. This removes unnecessary complexity while maintaining the essential back pressure control capability needed for engine testing.
Solution Approach 2:
The patent replaces mechanical back pressure control systems with an electronically-controlled valve system that uses electronic signals to adjust exhaust flow. This substitution reduces mechanical complexity and enables more precise, programmable control of back pressure during engine tests.
2Stress or pressure
If restrictive exhaust components are installed to maintain back pressure, then exhaust flow restriction capability is improved, but exhaust flow rate decreases
Solution Approach 1:
The patent implements a dynamic back pressure control system where the valve position is continuously adjusted based on real-time exhaust flow rate measurements and desired back pressure targets. This dynamic adjustment allows the system to maintain optimal back pressure while maximizing exhaust flow, unlike static restrictive components that permanently reduce flow capacity.
Solution Approach 2:
The patent changes the control parameter from fixed mechanical restriction to variable electronic control. The valve opening degree is adjusted as a controllable parameter to achieve different back pressure levels without permanently restricting exhaust flow, allowing optimization of both back pressure and flow rate based on test requirements.
3Productivity
If traditional exhaust systems are used without active control, then system simplicity is maintained, but testing time and efficiency decrease
Solution Approach 1:
The patent implements a feedback control system where exhaust flow rate and back pressure are continuously measured, and the valve position is automatically adjusted to maintain desired back pressure levels. This closed-loop control eliminates the need for manual adjustments and accelerates the testing process by automatically optimizing exhaust conditions during engine tests.
Solution Approach 2:
The control system performs self-adjustment of back pressure based on real-time sensor data and pre-programmed test parameters. The system automatically maintains optimal exhaust conditions without requiring external intervention or complex manual操作流程, thereby reducing testing time and improving efficiency.
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 reduces testing time, improves the accuracy of back pressure control across a broader range of exhaust flow rates, and simplifies the exhaust system, eliminating the need for restrictive components like catalytic converters, thereby reducing testing costs and complexity.
Implementation Method 1
a valve control module that selectively adjusts a valve position of an exhaust valve that restricts an exhaust flow of the engine based on the desired exhaust back pressure
Implementation Method 2
A first annular protrusion may be coupled to the inner surface and may protrude towards the throttle plate. The first annular protrusion may abut a first side of the circumferential portion and may restrict fluid flow through the annular space when the throttle plate is positioned in the second rotational position.
Data Source
AI summary
A control system for an engine includes a restriction determination module and a valve control module. The restriction determination module determines a desired exhaust back pressure of the engine based on an exhaust flow rate of the engine. The valve control module selectively adjusts a valve position of an exhaust valve that restricts an exhaust flow of the engine based on the desired exhaust back pressure. The exhaust valve may include a valve body, a throttle plate, and an annular protrusion coupled to an inner surface of the valve body and protruding towards the throttle plate. The annular protrusion may abut a side of the throttle plate and may restrict fluid flow through an annular space between the throttle plate and the inner surface when the throttle plate is positioned in a rotational position transverse to a direction of fluid flow. A related method is also provided.