Engine Intake Four-Way Valve Condensed Water Management
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Solution Overview
Problem
Condensed water generated by mixing low-temperature outside air and high-temperature recirculation gas in engine systems can lead to corrosion and damage in the EGR cooler and recirculation passage due to its high acidity, affecting combustion efficiency and engine performance.
Innovation Solution
An engine system with a bypass line and a condensed water separation module, controlled by a four-way valve and a controller, which directs the air-fuel mixture through different flow paths based on outside air temperature, humidity, and vehicle speed to minimize condensed water introduction into the combustion chamber, using an intercooler and a condensed water separation line to separate and evaporate condensed water.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the EGR system recirculates high-temperature exhaust gas and cools it through the EGR cooler, then the combustion efficiency is improved by controlling NOx, but condensed water is generated which causes corrosion to the EGR cooler and recirculation passage
Solution Approach 1:
The patent extracts the harmful condensed water from the recirculated exhaust gas stream by introducing a separate drainage line that branches from the recirculation passage. This allows condensed water to be removed independently from the main EGR flow, preventing it from entering the combustion chamber while maintaining the beneficial cooling and NOx control functions of the EGR system.
Solution Approach 2:
The patent introduces a three-way valve as an intermediary device that controls the flow path of recirculated exhaust gas. This valve mediates between the EGR cooler outlet and two possible destinations: the intake passage (for normal operation) and the drainage line (for condensed water removal). The intermediary valve enables selective routing to prevent corrosion damage while maintaining combustion efficiency.
2Temperature
If low-temperature outside air is mixed with high-temperature recirculation gas, then the combustion temperature is controlled to reduce NOx, but condensed water is generated due to temperature difference
Solution Approach 1:
The patent converts the harmful effect of condensed water generation into a beneficial separation process. By providing a dedicated drainage line and three-way valve, the system allows condensed water to be intentionally separated and removed from the exhaust gas stream. The temperature difference that causes condensation is thus transformed from a problem into an opportunity for harmful substance removal.
Solution Approach 2:
The patent performs preliminary removal of condensed water from the recirculated exhaust gas before it enters the combustion chamber. The drainage line and three-way valve are positioned to intercept and remove condensed water early in the recirculation path, preventing it from causing harm downstream in the engine system.
3Reliability
If the four-way valve directs mixture through the condensed water separation line, then condensed water is removed from the intake air, but the device complexity increases with additional valves and lines
Solution Approach 1:
The patent designs the three-way valve to perform multiple functions: controlling the flow of recirculated exhaust gas to either the intake passage or drainage line, and also managing the flow of fresh air through the intercooler. This multi-functionality reduces the need for separate dedicated valves for each function, thereby limiting the increase in device complexity while achieving reliable condensed water removal.
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
Prevents engine damage by minimizing condensed water in the combustion chamber, reduces condensed water generation, and improves fuel efficiency by optimizing the use of recirculation gas, thereby enhancing combustion stability and thermal efficiency.
Implementation Method 1
an intercooler provided in the intake line downstream of the compressor and configured to cool the outside air compressed by the compressor and a recirculation gas recirculated by the exhaust gas recirculation device
Implementation Method 2
a condensed water separation module provided in the condensed water separation line and configured to separate condensed water contained in a mixture flowing through the condensed water separation line
Implementation Method 3
a turbine rotating by the exhaust gas discharged from the combustion chamber and a compressor rotating in conjunction with the turbine
Data Source
AI summary
An engine system, includes a bypass line branched from an intake line upstream of an intercooler and joining the intake line downstream of the intercooler; a condensed water separation line branched from the intake line upstream of the intercooler and joining the intake line upstream of the intercooler; a condensed water separation module provided in the condensed water separation line and configured to separate condensed water contained in a mixture flowing through the condensed water separation line; and a four-way valve provided in the intake line between a compressor and the intercooler, and selectively operated so that the mixture of the outside air and the recirculation gas introduced to the upstream of the intercooler passes through the intercooler, flows through the bypass line, or flows through the condensed water separation line.