Intake Duct Sensor Positioning for Backflow Interference
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Solution Overview
Problem
Conventional sensor arrangements in internal combustion engines fail to accurately detect pressure due to backflow of intake air when high pressure intake is performed or the throttle valve is suddenly closed, causing dynamic pressure that interferes with pressure sensor readings.
Innovation Solution
A sensor arrangement that includes an intake duct with curved parts connecting an intercooler and a throttle, featuring a pressure sensor positioned near the outside curved portion of a curved part, which reduces the impact of backflow on pressure detection by placing the sensor away from the main air stream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the pressure sensor is installed in the middle of the intake piping, then the pressure can be detected, but the sensor is subjected to dynamic pressure from backflow when high pressure intake is performed or the throttle valve is suddenly closed
Solution Approach 1:
The pressure sensor is extracted from the main flow path of the intake piping and repositioned to a curved portion where the air flow dynamics are different. This removes the sensor from the harmful backflow zone while maintaining its pressure detection function.
Solution Approach 2:
The sensor is pre-positioned in a curved portion of the intake duct where airflow patterns naturally protect it from direct backflow impact. This preliminary placement prevents the harmful dynamic pressure from reaching the sensor during sudden throttle closures or high pressure intake events.
2Measurement precision
If the sensor is placed in the main air stream, then pressure detection is possible, but backflow directly impacts the sensor causing inaccurate readings
Solution Approach 1:
The sensor is extracted from the main air stream location and repositioned to a curved portion of the intake duct. This extraction removes the sensor from direct exposure to backflow while maintaining its ability to detect pressure changes in the intake system.
Solution Approach 2:
The sensor is placed in a specific local region (curved portion) of the intake duct where the flow characteristics are different from the main stream. This local positioning exploits the unique airflow patterns in curved sections to protect the sensor from backflow while maintaining pressure detection capability.
Data Source
AI summary
A sensor arrangement of an internal combustion engine includes an intake duct including one or more curved parts bent or curved and connecting an intercooler and a throttle; and a pressure sensor provided on the intake duct and configured to detect a pressure in the intake duct. The pressure sensor includes a detector disposed close to an outside curved portion of a curved part.