Back Pressure Valve Control Constant Adjustment for Noise Reduction
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Solution Overview
Problem
Conventional back pressure valve control methods result in noise discomfort for drivers, especially during idling conditions, due to high responsiveness and large control constants, which are not effectively managed in existing systems.
Innovation Solution
A method to dynamically control the control constant of the back pressure valve based on engine speed, fuel injection rate, shift gear position, and EGR valve shut-off conditions, adjusting it to a compensation value when noise is a concern and returning to a reference value under normal operating conditions to balance noise reduction with responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the control constant of the back pressure valve is set to be comparatively large to achieve high responsiveness, then the valve responds quickly to control commands, but noise is generated from the actuator gears that causes driver discomfort during idling conditions
Solution Approach 1:
The control constant of the back pressure valve is made dynamically adjustable based on operating conditions. The controller switches between a first control constant (for high responsiveness during driving) and a second control constant (for noise reduction during idling), allowing the system to adapt its responsiveness characteristics to different operational states.
Solution Approach 2:
The invention changes the control parameter (control constant) based on engine operating conditions. By detecting whether the vehicle is in an idling state or driving state, the system adjusts the control constant value to optimize both responsiveness and noise characteristics for each operating mode.
2Object-affected harmful factors
If the control constant is reduced to reduce noise during idling, then driver comfort is improved, but the responsiveness of the back pressure valve deteriorates
Solution Approach 1:
The control constant is made dynamically switchable between two distinct values based on real-time detection of vehicle operating state. This allows the system to maintain high responsiveness when needed (during driving) while reducing noise when the vehicle is idling, effectively resolving the trade-off through conditional parameter adjustment.
Solution Approach 2:
The system implements parameter change by switching between a first control constant value (higher, for responsiveness) and a second control constant value (lower, for noise reduction) based on whether the vehicle is in driving or idling state, as detected by the controller.
Data Source
AI summary
A method for controlling a back pressure valve may include: an operation of sensing, by a controller, an engine speed and a fuel injection rate; an operation of comparing the engine speed with a preset speed and comparing the fuel injection rate with a preset injection rate after the operation of sensing; and a first control operation of, when a result of the operation of comparing indicates that the engine speed is less than the preset speed and that the fuel injection rate is less than the preset injection rate, controlling a control constant of the back pressure valve to be set to a compensation value that is less than a reference value.