Air Intake Directing Device for Flow Meter Accuracy
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Solution Overview
Problem
Existing air intake systems for motor vehicle engines struggle to accurately measure air flow rates, especially at low flow rates, due to diffuse air flow that prevents precise measurement by the flow meter.
Innovation Solution
An air intake set with a directing device positioned upstream of the flow meter, featuring a conical shape with variable permeability, such as movable deflectors or openings of varying sizes, to concentrate and focus the air flow towards the flow meter, ensuring accurate measurement across all flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional flow meter is used in the air intake line, then the air flow rate can be measured, but the measurement accuracy deteriorates at low flow rates due to diffuse air flow
Solution Approach 1:
The directing device incorporates movable deflectors that can dynamically adjust their position based on air flow conditions. At low flow rates, the deflectors concentrate the diffuse air flow toward the flow meter to improve measurement accuracy. At high flow rates, the deflectors move to allow unrestricted flow, preventing pressure drops. This dynamic adaptation resolves the contradiction between measurement accuracy and flow reliability across different operating conditions.
Solution Approach 2:
The directing device changes the flow parameters (velocity distribution and flow concentration) based on the operating conditions. By varying the deflector positions, the device modifies how air flow is directed toward the flow meter, ensuring optimal measurement conditions at low flow rates while maintaining proper flow characteristics at high rates, thus resolving the measurement reliability issue.
2Measurement precision
If the directing device has fixed permeability, then the structure is simple, but it cannot accurately measure both low and high flow rates
Solution Approach 1:
The directing device uses movable deflectors that can change position based on air flow conditions. This dynamic structure allows the device to adapt its permeability and flow direction characteristics, enabling accurate measurements across the entire flow rate range while maintaining a relatively simple overall structure that integrates with the existing air intake system.
Solution Approach 2:
The deflectors are designed to move automatically in response to air flow conditions without requiring external control systems. The air flow itself acts on the deflectors to position them appropriately, making the device self-regulating and reducing the need for complex control mechanisms while maintaining measurement accuracy across different operating conditions.
3Measurement precision
If the directing device concentrates air flow at low flow rates, then measurement accuracy improves, but pressure drops increase at high flow rates
Solution Approach 1:
The movable deflectors dynamically adjust their position based on air flow rate. At low flow rates, they concentrate the air flow toward the flow meter to improve measurement accuracy. At high flow rates, they move to reduce flow resistance and minimize pressure drops. This dynamic behavior resolves the contradiction between measurement accuracy and pressure loss.
Solution Approach 2:
The directing device changes the flow concentration parameter based on operating conditions. By varying the deflector positions, it adjusts the degree of flow concentration, ensuring optimal measurement conditions at low flow rates while preventing excessive pressure drops at high flow rates through reduced flow concentration.
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
Enables accurate measurement of air flow rates over the entire operational range of the engine by adjusting permeability to enhance air flow velocity at low rates and reduce pressure drops at high rates, thereby improving measurement precision and compliance with pollution standards.
Implementation Method 1
The deflectors are adapted to be displaced under the pressure of the air flow, so as to vary the permeability of the directing device
Data Source
AI summary
An air intake set for a motor vehicle engine, including an air intake hose, a flow meter and a device for directing an air flow positioned upstream of the flow meter with respect to the direction of circulation of the air flow in the hose. The device for directing an air flow is adapted to guide the air flow towards the flow meter and has a variable permeability so as to set the velocity of the air flow.