Variable Tailpipe Valve Backpressure Control
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Solution Overview
Problem
Exhaust systems for internal combustion engines face increased backpressure due to components like particulate filters, which degrades power and fuel consumption performance, while maintaining low noise emissions is a challenge.
Innovation Solution
An exhaust system incorporating a variable tailpipe valve controlled by a controller that adjusts its position based on backpressure measurements to maintain optimal performance thresholds, reducing backpressure by estimating particulate filter loading and interpolating valve positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a particulate filter is added to the exhaust system to improve environmental cleanliness, then exhaust gas cleanliness is improved, but exhaust backpressure increases and system performance degrades
Solution Approach 1:
The patent applies a variable valve positioned downstream of the particulate filter that can dynamically adjust its opening degree based on real-time backpressure conditions. This dynamic adjustment allows the system to optimize the balance between filter effectiveness and exhaust flow resistance, resolving the contradiction between improved gas cleanliness and maintained system performance.
Solution Approach 2:
The system changes the flow resistance parameter by adjusting the variable valve's opening degree. When backpressure exceeds a threshold, the valve opens wider to reduce resistance; when backpressure is acceptable, the valve maintains a restricted position to support particulate trapping efficiency, thus adapting the parameter to resolve the performance contradiction.
2Object-generated harmful factors
If a particulate filter is added to the exhaust system to improve environmental cleanliness, then exhaust gas cleanliness is improved, but exhaust backpressure increases and fuel consumption performance degrades
Solution Approach 1:
The variable valve dynamically adjusts its opening degree in response to backpressure conditions caused by particulate filter loading. By opening the valve when backpressure is high, the system reduces exhaust flow resistance, thereby reducing the energy penalty and fuel consumption while maintaining the filter's particulate trapping capability.
Solution Approach 2:
The system uses backpressure sensors to provide feedback on the particulate filter's loading condition. This feedback controls the variable valve's position, which in turn regulates exhaust backpressure to acceptable levels, preventing excessive fuel consumption while preserving the environmental benefits of the filter.
3Power
If the variable valve is opened to reduce backpressure and improve power performance, then system performance is improved, but noise emissions may increase
Solution Approach 1:
The system changes the valve opening parameter based on real-time backpressure measurements. When backpressure exceeds thresholds that would harm performance, the valve opens to reduce resistance and improve power output. The control system monitors and balances this parameter change to prevent excessive noise generation from the altered exhaust flow.
Data Source
AI summary
An exhaust system includes a particulate filter, a variable valve, and a controller communicatively connected to the variable valve. The controller is operative to determine a backpressure caused by the particulate filter in the exhaust system, and control a position of the variable valve as a function of the backpressure caused by the particulate filter.