Throttle Valve Control for Induction Noise Reduction
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Solution Overview
Problem
Internal combustion engines produce audible noise due to pressure waves in the intake manifold, particularly at engine speeds below 2000 RPM, as existing air intake system components are unable to attenuate these waves effectively.
Innovation Solution
An engine control module (ECM) determines a target pressure downstream of the throttle valve based on inlet pressure and induction noise, adjusting the throttle valve opening to minimize noise by trapping pressure waves within the intake system, thereby reducing audible noise in the passenger cabin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the throttle valve opening is increased to improve engine torque output, then torque productivity increases, but induction noise increases due to pressure waves in the intake manifold
Solution Approach 1:
The system dynamically adjusts the throttle valve opening based on real-time detection of pressure waves in the intake manifold. The throttle control system monitors induction noise levels and modulates the throttle opening to optimize both torque output and noise reduction, creating a dynamic balance between performance and acoustic comfort.
Solution Approach 2:
The system employs feedback control by continuously monitoring pressure wave characteristics in the intake manifold and using this information to adjust the throttle valve opening. The feedback loop enables the system to reduce induction noise while maintaining acceptable torque output through adaptive throttle control.
2Device complexity
If existing air intake system components are used, then device complexity is low, but they are unable to attenuate pressure waves effectively
Solution Approach 1:
The patent replaces passive mechanical noise attenuation structures with an active electronic control system. Instead of relying on fixed acoustic treatment components, the system uses an electronic throttle control mechanism that actively modulates pressure waves through dynamic opening adjustments, achieving superior noise reduction without adding complex mechanical attenuation structures.
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
The ECM's adaptive control of the throttle valve opening effectively limits induction noise by canceling or attenuating pressure waves, improving passenger cabin acoustics at lower engine speeds.
Implementation Method 1
adjusting the throttle valve opening to minimize noise by trapping pressure waves within the intake system, thereby reducing audible noise
Implementation Method 2
effectively limits induction noise by canceling or attenuating pressure waves
Data Source
AI summary
A throttle control system includes a target pressure module, a torque determination module, and a target opening module. The target pressure module determines an induction noise value based on an engine operating parameter and determines a target pressure downstream of a throttle valve of an engine based on a pressure at an inlet of the throttle valve and the induction noise value. The torque determination module determines a torque request for the engine based on the target pressure. The target opening module determines a target opening for the throttle valve based on the torque request and selectively adjusts opening of the throttle valve based on the target opening.