Hybrid Muffler with Bypass Flow Path for Heat Recovery
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Solution Overview
Problem
In motor vehicles with hybrid drives, the limited space for exhaust system installation and stringent noise reduction requirements make it challenging to use large mufflers with integrated heat exchanger units effectively, while the waste heat from internal combustion engines is often insufficient for thermal conditioning.
Innovation Solution
A muffler design with a compact configuration featuring two exhaust gas flow paths and a flow path blocking/releasing device, allowing the combustion exhaust gas to either flow through a heat exchanger unit or bypass it, utilizing a heat exchanger unit integrated in the muffler housing and multiple chambers with muffling material for efficient heat transfer and noise attenuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a large muffler with integrated heat exchanger unit is used to utilize waste heat, then heat transfer efficiency is improved, but the available installation space is exceeded
Solution Approach 1:
The heat exchanger unit is nested within the muffler housing, with the heat exchanger core positioned inside the muffler chamber. This allows the heat exchanger to utilize the internal volume of the muffler, creating a compact integrated structure that maximizes heat transfer surface area within limited space constraints
Solution Approach 2:
The exhaust gas flow path is configured to pass through multiple chambers and around the heat exchanger unit in a three-dimensional arrangement. The exhaust gas enters through an inlet pipe, flows through a first chamber around the heat exchanger, passes through a second chamber, and exits through an outlet pipe, utilizing vertical and radial space dimensions to maximize heat transfer efficiency without increasing overall muffler footprint
2Object-affected harmful factors
If a larger muffler is used to meet noise reduction requirements, then noise attenuation is improved, but the installation space requirement increases
Solution Approach 1:
The muffler is divided into multiple functional chambers: a first chamber for primary noise attenuation and exhaust gas distribution, a second chamber for additional noise reduction, and integrated heat exchanger sections. This segmentation allows each chamber to be optimized for specific functions, achieving high noise attenuation in a compact overall structure
Solution Approach 2:
The muffler housing serves multiple functions simultaneously: it acts as a noise attenuation chamber, a heat exchanger housing, an exhaust gas distribution manifold, and a structural mounting component. The integrated design combines noise reduction, heat recovery, and exhaust flow management into a single multi-functional unit, maximizing performance while minimizing volume
3Use of energy by moving object
If the heat exchanger unit processes all exhaust gas, then heat transfer efficiency is improved, but thermal overload of the heat exchanger unit occurs
Solution Approach 1:
A flow path control mechanism is implemented that can dynamically adjust the exhaust gas flow distribution between different chambers and heat exchanger sections. This allows the system to adapt to varying operating conditions, directing exhaust gas flow to optimize heat transfer efficiency while preventing thermal overload by distributing heat load across multiple heat exchanger units or bypassing them when necessary
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
The design enables efficient utilization of heat from combustion exhaust gas while maintaining good muffling characteristics, reducing noise emissions, and avoiding thermal overload of the heat exchanger unit, even in limited space, by adjusting the flow paths based on heat demand and operating conditions.
Implementation Method 1
a heat exchanger unit for transmitting heat from the combustion exhaust gas to the heat transfer medium
Implementation Method 2
through which a heat transfer medium and combustion exhaust gas can flow
Implementation Method 3
multiple chambers with muffling material for efficient heat transfer and noise attenuation
Data Source
AI summary
A muffler for an exhaust system of an internal combustion engine, especially for vehicles with hybrid drive, includes a muffler housing (12), a heat exchanger unit (48), arranged in the muffler housing (12), for transferring heat from combustion exhaust gas to a heat transfer medium, an inlet pipe (38), a first outlet pipe (52) and a second outlet pipe (40). A first exhaust gas flow path (54), in the muffler housing, routs exhaust gas through the heat exchanger unit (48) to the first outlet pipe (52). A second exhaust gas flow path (56), in the muffler housing, routs exhaust gas to a second outlet pipe (40), bypassing the heat exchanger unit (48). A flow path blocking/releasing device (58) for blocking and releasing at least one exhaust gas flow path (54, 56), of the first exhaust gas flow path (54) and of the second exhaust gas flow path (56).