Integrated Mass Air Flow and Pressure Sensor Gap Design
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Solution Overview
Problem
Existing mass air flow measurement devices for internal combustion engines face challenges in integrating multiple sensors and controllers, leading to complex wiring and potential errors due to dust and water ingress, which affect precision and increase production costs.
Innovation Solution
A heating resistor type mass air flow measurement device is integrated with a semiconductor pressure sensing device, featuring a pressure intake port positioned outside the inner wall of the intake air tube to prevent water film formation and dust adherence, with a recessed design to improve attachment and reduce component count.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pressure intake tube is formed into a narrow tube to prevent dust or water entry, then pressure sensing precision is maintained, but water can easily form a water film or be frozen inside the tube, causing degradation in pressure sensing precision
Solution Approach 1:
The pressure intake function is extracted from the narrow pressure intake tube and redirected through the gap between the mass air flow measurement device and the intake air tube. This allows the pressure sensing part to be isolated from direct water exposure while still measuring intake air pressure, eliminating water film formation and freezing issues in the pressure intake path.
Solution Approach 2:
The gap between the mass air flow measurement device and the intake air tube serves as an intermediary pressure intake path. Instead of water directly entering the pressure sensing part through a narrow tube, the pressure is transmitted through this gap, which prevents water film formation while maintaining pressure measurement capability.
2Device complexity
If the heating resistor type mass air flow measurement device is integrated with the semiconductor type pressure converter, then the number of components is decreased and wiring is simplified, but the pressure intake tube becomes exposed to dust or water, causing degradation in sensing precision
Solution Approach 1:
The mass air flow measurement device and pressure sensing device are merged into a single integrated unit, reducing the number of components and simplifying wiring. The pressure sensing part is positioned within the housing of the mass air flow measurement device, allowing both functions to share the same housing and connector.
Solution Approach 2:
The pressure intake function is extracted from the traditional narrow pressure intake tube and redirected through the gap between the mass air flow measurement device and the intake air tube. This eliminates the need for a separate narrow pressure intake tube that would be exposed to dust and water, while maintaining pressure measurement capability.
3Reliability
If the pressure intake tube is made narrow to prevent dust or water entry, then pressure sensing errors are prevented, but the tube structure becomes vulnerable to water film formation and freezing
Solution Approach 1:
The pressure intake function is extracted from the narrow pressure intake tube and redirected through the gap between the mass air flow measurement device and the intake air tube. This eliminates the narrow tube structure that is vulnerable to water film formation and freezing, while maintaining pressure measurement reliability.
Solution Approach 2:
The gap between the mass air flow measurement device and the intake air tube serves as an intermediary pressure intake path. This gap structure prevents direct water contact with the pressure sensing part while still allowing pressure transmission, thereby maintaining reliability without the vulnerabilities of narrow tubes.
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 integration reduces the number of components, simplifies assembly, and maintains high-precision fuel control, contributing to eco-friendly and fuel-efficient engine systems with reduced environmental impact and lower production costs.
Implementation Method 1
This device takes advantage of the fact that the amount of heat that a heating resistor is deprived of is in correlation with the amount of intake air flow
Implementation Method 2
a pressure sensing part formed of a semiconductor, and uses a pressure intake tube
Data Source
Figure 1
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AI summary
In an intake air mass flow measurement device, for preventing clogging in a pressure intake tube due to water or the like entering the pressure intake tube in a device measuring a pressure in the intake air tube, the intake air mass flow measurement device includes a mass air flow measurement device (100) for measuring an intake air mass flow in an intake air tube; and a pressure sensing device (150) for sensing pressure in the intake air tube, the pressure sensing device being integrated with the mass air flow measurement device, and an aperture plane opened to the inside of a main air flow passage for detection of the pressure takes in pressure by using a gap generated between a main air flow passage constituting member (200) and an insertion part of the mass air flow measurement device (100) when a measurement part of the mass air flow measurement device (100) is inserted into the main air flow passage. With this construction, it is possible to provide a structure in which water or the like can hardly clog the pressure intake port.