Exhaust Gas Throttle Device Rigidity and Pressure Sensor Layout
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Solution Overview
Problem
Conventional engine designs face challenges in maintaining exhaust gas temperature for effective purification, reducing the volume of the exhaust gas intake side of the purifier, and improving the durability and vibration-proofing of coupling components like flexible rubber hoses and pipes due to specific structural constraints.
Innovation Solution
The engine apparatus features an exhaust manifold with an exhaust gas throttle device fastened to the exhaust manifold's exit, a relay pipe coupled to the throttle valve casing, and an EGR cooler positioned below, along with a heat-conducting exhaust gas pressure sensor pipe and cooling water pipe secured to a pipe supporting bracket, allowing for compact layout, improved rigidity, and reduced vibration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the exhaust gas pressure sensor is disposed close to the exhaust manifold, then the sensor can detect exhaust gas pressure accurately, but the coupling component (flexible rubber hose) heats up due to proximity to hot exhaust gas
Solution Approach 1:
The patent introduces an intermediate structure (exhaust gas pressure sensor pipe with heat insulation layer) between the exhaust manifold and the exhaust gas pressure sensor. This intermediary component transmits the exhaust gas pressure signal while protecting the sensor and coupling components from direct exposure to high-temperature exhaust gas, thus maintaining both measurement accuracy and component durability
2Reliability
If the exhaust gas pressure sensor is disposed far from the exhaust manifold, then the coupling component is protected from heat, but the coupling component becomes more susceptible to vibration
Solution Approach 1:
The patent applies vibration-proofing structures (such as rubber hoses with vibration damping properties or vibration isolators) to the coupling components before they are exposed to vibration. This beforehand cushioning protects the coupling components from vibration damage while maintaining their thermal protection from exhaust gas heat
3Volume of stationary object
If the throttle valve casing is coupled to the exhaust manifold through a relay pipe, then the exhaust gas intake side volume can be reduced, but the structure becomes more complex
Solution Approach 1:
The patent merges the relay pipe function into the overall exhaust manifold structure, integrating the volume reduction feature with the existing manifold design. This merging approach achieves compact exhaust gas intake side volume while avoiding the complexity of separate, independently coupled relay pipe assemblies
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 accurate exhaust gas pressure adjustment, maintains proper exhaust gas temperature for purification, enhances durability and vibration-proofing of components, and simplifies the structure for reduced production costs.
Implementation Method 1
An EGR cooler for cooling EGR gas is disposed in the exhaust gas flow path of the conventionally known engine
Implementation Method 2
an exhaust gas throttle valve is disposed to increase a pressure of exhaust gas of the engine, and the exhaust gas throttle valve increases the pressure of exhaust gas from the engine, thereby raising the temperature of exhaust gas discharged from the engine
Implementation Method 3
a heat-conducting exhaust gas pressure sensor pipe configured to couple the exhaust gas pressure sensor to the exhaust manifold
Data Source
AI summary
Provided is an engine apparatus that ensures highly accurate adjustment of the exhaust gas pressure of an exhaust manifold while providing an exhaust gas throttle device with a support structure of increased rigidity. The engine apparatus includes: an engine including the exhaust manifold; and the exhaust gas throttle device to adjust an exhaust gas pressure of the exhaust manifold. An exhaust gas intake side of a throttle valve easing of the exhaust gas throttle device is fastened to an exhaust gas exit of the exhaust manifold. An exhaust pipe is coupled to the exhaust manifold through the throttle valve casing.