Exhaust Bypass Valve for Heat Recovery Flow Control
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Solution Overview
Problem
Existing energy recovery systems for vehicle heat engines face challenges in ensuring a sufficient flow rate of exhaust gases through bypass ducts due to inadequate pressure, leading to unpredictable gas recirculation and inefficiencies in energy reuse.
Innovation Solution
Incorporating a valve downstream of the bypass duct connection in the exhaust circuit that can partially or fully close the exhaust circuit to increase gas pressure and control flow rates, allowing precise modulation of gas flow through a heat exchanger and enabling efficient recirculation or heating/cooling of vehicle fluids.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a bypass duct with heat exchanger is used for energy recovery, then heat exchange efficiency is improved, but gas flow rate becomes insufficient due to low exhaust pressure
Solution Approach 1:
The patent introduces a controllable valve in the exhaust circuit that can dynamically adjust its opening degree based on operating conditions. This dynamic adjustment allows the system to optimize both heat exchange efficiency and gas flow rate under different engine loads and speeds, resolving the contradiction between these two parameters.
Solution Approach 2:
The patent changes the pressure parameter in the exhaust circuit by using the valve to create backpressure. This parameter change enables sufficient gas flow rate through the heat exchanger while maintaining effective heat exchange, thus resolving the contradiction between heat exchange efficiency and gas flow rate.
2Productivity
If exhaust pressure is increased to improve flow rate, then gas circulation is improved, but system complexity increases due to additional pressure control mechanisms
Solution Approach 1:
The valve introduced in the patent serves multiple functions: it controls exhaust gas flow rate, regulates pressure in the exhaust circuit, and directs gas flow to different destinations (bypass duct or atmosphere). This multi-functionality improves gas circulation without proportionally increasing system complexity.
Solution Approach 2:
The valve is controlled based on feedback from the exhaust system's own operating parameters (pressure, flow rate), allowing the system to self-regulate and maintain optimal gas circulation without requiring complex external control systems.
3Measurement precision
If a valve is added to control exhaust gas flow, then flow rate control precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent employs a relatively simple valve design that can be manufactured at low cost, accepting that the valve may require periodic maintenance or replacement rather than being a permanent, highly sophisticated component. This approach achieves sufficient flow rate control precision while keeping manufacturing costs reasonable.
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 enhances gas pressure and flow control, ensuring reliable and efficient energy recovery by allowing precise adjustment of gas flow rates, improving energy reuse and reducing gas leaks, while maintaining system compactness and cost-effectiveness.
Implementation Method 1
The bypass duct is equipped with a heat exchanger, designed to cool the gases passing through said duct by using a heat transfer fluid
Implementation Method 2
the part of the exhaust circuit located downstream of the point of connection of the bypass duct to said circuit is provided with a valve capable of at least partially closing the exhaust circuit
Data Source
AI summary
The invention relates to a system for recovering energy in an exhaust gas circuit (3) of a heat engine (1) of a vehicle, said system comprising an exhaust gas bypass duct (15) comprising a heat exchanger (18). An energy recovery system according to the invention is mainly characterised by the fact that the part of the exhaust circuit arranged downstream of the connection point (17) of the bypass duct (15) for connecting to said circuit (3) is provided with a valve (16) that can at least partially close the exhaust circuit (3), and the by-pass duct (15) comprises, at the outlet of the exchanger (18), a first pipeline (20) running into the admission circuit (2, 6) and a second pipeline (21) running into the exhaust circuit (3) downstream of the valve (16).