Intake Device Bypass Pipe Catch Tank Condensed Water Management
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Solution Overview
Problem
Conventional intake devices for internal combustion engines experience misfire during idling due to the introduction of a large amount of condensed water into the intake manifold, caused by negative pressure, which can lead to corrosion and inefficient combustion.
Innovation Solution
An intake device with a bypass pipe and catch tank system that connects between the intercooler and throttle valve, preventing a large pressure difference and thus minimizing the discharge of condensed water, along with a resonator connected to the bypass pipe to reduce noise and improve design flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a storage tank with supply pipe and discharge pipe is used to store condensed water, then corrosion of the intake pipe is reduced, but a large amount of condensed water is discharged into the intake manifold during idling causing misfire
Solution Approach 1:
The patent divides the condensed water discharge function into two separate systems: a first discharge path (supply pipe) that discharges condensed water to the atmosphere to prevent corrosion, and a second discharge path (bypass pipe with catch tank) that handles condensed water during idling to prevent misfire. This segmentation allows each system to be optimized for its specific function without interfering with the other.
Solution Approach 2:
The bypass pipe acts as an intermediary component between the storage tank and the intake manifold. It includes a catch tank that temporarily holds condensed water and a discharge hole that releases it at controlled rates, serving as a mediator that prevents direct discharge of large amounts of condensed water into the intake manifold during idling.
2Reliability
If the throttle valve closes the intake passage during idling to maintain engine operation, then the engine can idle stably, but the magnitude of negative pressure in the intake manifold increases causing excessive condensed water discharge
Solution Approach 1:
The patent extracts the condensed water discharge function from the main intake passage by providing a separate bypass pipe system. The bypass pipe includes a catch tank that is connected to the storage tank and discharges condensed water at a controlled rate, separating this function from the throttle valve's primary function of controlling intake air flow during idling.
Solution Approach 2:
The bypass pipe system dynamically adjusts condensed water discharge based on operating conditions. The discharge hole in the catch tank allows condensed water to be discharged at a rate that responds to pressure differences, automatically regulating the discharge amount according to engine operating conditions without requiring additional control mechanisms.
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 misfire during engine idling by effectively managing condensed water and reducing noise through the bypass pipe and catch tank system, while the resonator enhances sound absorption, improving the overall performance and reliability of the intake device.
Implementation Method 1
condensed water that is generated as a result of cooling of air in the intercooler
Implementation Method 2
a resonator (43) connected to the bypass pipe. According to this configuration, the noise generated in the intake device can be suppressed
Implementation Method 3
Since the pressure in the intake manifold is negative, the condensed water stored in the storage tank is discharged to the intake manifold via the discharge pipe
Data Source
AI summary
An intake device for an internal combustion engine includes: a main pipe having an upstream end forming a suction port and a downstream end configured to be connected to an intake port of an internal combustion engine main body; a compressor of a supercharger provided in the main pipe; an intercooler provided in the main pipe at a position downstream of the compressor and including a cooling part, an upstream header provided upstream of the cooling part, and a downstream header provided downstream of the cooling part; a throttle valve disposed in the main pipe at a position downstream of the intercooler; a bypass pipe having a first end and a second end, the bypass pipe being connected to a part of the main pipe between the cooling part and the throttle valve; and a catch tank provided in the bypass pipe and configure to catch condensed water.