Exhaust Catalyst Cooling and Vibration Isolation
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Solution Overview
Problem
Existing exhaust treatment devices for internal combustion engines face increased costs due to the need for separate vibration cut-off members in the exhaust path and circulation pipe, especially when using electric-heating-type catalysts with low heat resistance, which require positioning far from the engine to maintain effectiveness.
Innovation Solution
The device incorporates a catalytic converter with a heat-generating catalyst support, a cooling member to manage exhaust temperature, and a single vibration cut-off member downstream of the catalytic converter, along with a circulation pipe that branches off between the catalytic converter and the vibration cut-off member, allowing for compact design and reduced costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the catalytic converter is positioned near the internal combustion engine, then the exhaust treatment device achieves compactness, but the catalyst support experiences excessive heat exposure due to low heat resistance
Solution Approach 1:
A cooling member is introduced as an intermediary between the internal combustion engine and the catalytic converter. This cooling member cools the exhaust gas before it reaches the catalytic converter, thereby protecting the heat-sensitive catalyst support from excessive thermal exposure while allowing the catalytic converter to be positioned closer to the engine for compactness
2Reliability
If separate vibration cut-off members are provided for both the exhaust path and circulation pipe, then vibration isolation is effective, but the device complexity and cost increase
Solution Approach 1:
The vibration cut-off member installed on the exhaust path is designed to serve multiple functions: it isolates vibrations not only for the exhaust path but also for the circulation pipe that branches off from it. This multi-functional design eliminates the need for a separate vibration cut-off member on the circulation pipe, thereby reducing device complexity and cost while maintaining effective vibration isolation
3Temperature
If the catalyst support is positioned far from the internal combustion engine, then heat resistance requirements are reduced, but the exhaust treatment device loses compactness
Solution Approach 1:
The cooling member acts as a mediator that enables the catalyst support to be positioned close to the engine despite its low heat resistance. By cooling the exhaust gas before it reaches the catalytic converter, the cooling member creates a thermal buffer that protects the heat-sensitive catalyst support, allowing compact positioning without compromising thermal durability
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 configuration ensures effective exhaust purification even with low heat-resistant catalyst supports, reduces costs by eliminating the need for multiple vibration cut-off members, and maintains compactness by positioning the catalytic converter near the engine.
Implementation Method 1
a catalyst support that generates heat by being energized
Implementation Method 2
a cooling member that is provided on a portion of the exhaust path from the internal combustion engine to the catalytic converter, and that cools the exhaust
Data Source
AI summary
A decrease in cost is devised at an exhaust treatment device that purifies exhaust from an internal engine by a catalyst that is heated from a catalyst support that generates heat by being energized, and that returns some of exhaust that has been purified to the internal combustion engine. A cooling member is provided at a portion of an exhaust pipe that is between an engine and an upstream catalytic converter, and a circulation pipe is branched-off from between the upstream catalytic converter and a vibration cut-off member that is at a downstream side.