Dual Temperature Sensor Flow Rate Measuring Device for Engine Intake
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Solution Overview
Problem
Conventional flow rate measuring devices for vehicle engines fail to accurately measure intake air quantity due to temperature differences between the main and sub-passages, leading to measurement errors.
Innovation Solution
A flow rate measuring device equipped with a first temperature sensor for the main passage and a second temperature sensor for the sub-passage, which measures the fluid temperature within both passages, allowing for precise temperature difference correction and accurate flow rate measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flow rate detection element is arranged in a sub-passage to measure fluid flow, then the device structure is simplified and manufacturing is easier, but measurement precision deteriorates due to temperature differences between main and sub-passages
Solution Approach 1:
The patent introduces temperature sensors as intermediary devices that measure the temperature difference between the main passage and sub-passage. This temperature information is then used to correct the flow rate measurement, effectively using the temperature sensors as mediators to compensate for the thermal environment discrepancy between the two passages.
Solution Approach 2:
The patent changes the measurement parameters by introducing temperature as an additional measured variable. By measuring both flow rate and temperature, and using the temperature data to correct the flow rate measurement, the system accounts for thermal effects without requiring complex structural modifications to the flow measurement mechanism.
2Measurement precision
If temperature sensors are added to measure temperature in both main and sub-passages, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The temperature sensors serve multiple functions: they measure the temperature in the main passage, measure the temperature in the sub-passage, and provide temperature difference data for correction calculations. This multi-functionality justifies the addition of sensors by maximizing their utility across different measurement needs.
Solution Approach 2:
The patent implements a feedback mechanism where temperature measurements are continuously used to correct flow rate measurements. The temperature difference information feeds back into the measurement system to compensate for thermal effects, creating a closed-loop correction process that improves accuracy while using simple sensor additions.
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 device achieves high precision in measuring intake air flow rates by correcting for temperature differences between the main and sub-passages, reducing measurement errors and enhancing accuracy, especially at lower flow rates.
Implementation Method 1
a first temperature sensor that measures a temperature of the fluid flowing in the main passage
Implementation Method 2
a second temperature sensor that is disposed within the sub-passage, and measures a temperature of a fluid different in temperature from the fluid flowing in the main passage
Data Source
AI summary
A flow rate measuring device with high precision is provided.The flow rate measuring device includes a sub-passage that takes a part of the fluid flowing in a main passage, first temperature measuring means for measuring a temperature of the fluid flowing in the passage, second temperature measuring means for measuring a temperature of a fluid flowing in the sub-passage, detecting means for detecting a flow rate of the fluid flowing in the sub-passage, and measuring means for measuring a flow rate of the fluid flowing within the main channel on the basis of an output of the first temperature measuring means, an output of the second temperature measuring means, and an output of the detecting means.