EGR Valve Flow Control via Pressure Sensor Integration
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Solution Overview
Problem
Conventional EGR systems face challenges in accurately controlling the recirculation gas flow rate, leading to compromised combustion stability and increased fuel consumption, particularly in low speed/low load areas, due to the reliance on separate differential pressure sensors which increase production costs and reduce precision.
Innovation Solution
An engine system with an EGR apparatus that includes a flow rate adjustment apparatus comprising a drive motor, flap, and speed sensor, allowing for precise control of the recirculation gas amount without a separate differential pressure sensor, utilizing a pressure sensor to determine if the EGR valve should be opened or closed and adjusting the rotational speed of the flap based on pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a separate differential pressure sensor is mounted to detect pressure difference for EGR control, then measurement precision of recirculation gas amount is improved, but production cost increases
Solution Approach 1:
The patent combines the pressure sensor function with the existing EGR valve assembly by installing the pressure sensor directly at the front end of the EGR valve. This integration allows the system to utilize the existing structural space and mounting points, eliminating the need for separate differential pressure sensors while maintaining accurate recirculation gas amount measurement capability.
2Adaptability or versatility
If a differential pressure generation valve is mounted to apply pressure in low speed/low load area, then EGR control capability is improved, but production cost increases
Solution Approach 1:
The patent utilizes the existing turbocharger system components (turbine and compressor) to generate the necessary pressure differential for EGR control. The system leverages the natural pressure differences created during engine operation, particularly in low speed/low load conditions, without requiring additional active pressure generation components. This self-service approach maintains EGR control capability while avoiding increased production costs.
3Device complexity
If pressure difference between front end and rear end of EGR valve is small in low speed/low load area, then device complexity is reduced, but EGR control precision deteriorates
Solution Approach 1:
The patent positions the pressure sensor at the front end of the EGR valve to measure pressure before the gas passes through the valve. This preliminary measurement allows the control system to accurately determine the recirculation gas amount even when pressure difference across the valve is small, maintaining control precision without increasing device complexity. The sensor placement enables early detection and compensation for low pressure differential conditions.
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 solution enables accurate measurement and control of the recirculation gas flow rate, enhancing combustion stability and reducing fuel consumption while eliminating the need for a separate differential pressure sensor, thereby lowering production costs.
Implementation Method 1
a pressure sensor installed at a front end of the EGR valve of the recirculation line to measure a pressure of a recirculation gas
Implementation Method 2
a turbine disposed at the exhaust line and rotating by an exhaust gas that is discharged from the combustion chambers
Implementation Method 3
rotating by an exhaust gas that is discharged from the combustion chambers
Implementation Method 4
a compressor, which is disposed in the intake line, rotating by interlocking with the turbine and compressing external air
Data Source
AI summary
An engine system having an exhaust gas recirculation (EGR) apparatus includes: an engine including a plurality of combustion chambers; an intake line through which an intake gas supplied to the combustion chambers flows; an exhaust line in which an exhaust gas discharged from the combustion chambers flows; and a turbocharger including: a turbine disposed at the exhaust line and rotating by the exhaust gas; and a compressor disposed in the intake line and rotating and compressing external air. The EGR apparatus includes a recirculation line branched from the exhaust line; an EGR valve disposed at the recirculation line and adjusting a recirculation gas amount; a pressure sensor disposed at a front end of the EGR valve to measure a pressure of a recirculation gas; and a flow rate adjustment apparatus disposed at a rear end of the EGR valve and adjusting the recirculation gas amount.