Cab-Over Engine Mounting for Exhaust Temperature
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Solution Overview
Problem
In cab-over type vehicles, the limited space in the engine room necessitates a longer distance for the exhaust gas after-treatment device, leading to lower exhaust gas temperatures and degraded catalyst purification performance due to the positioning of peripheral equipment.
Innovation Solution
The engine is mounted with the exhaust system adjacent to one side surface, allowing the exhaust gas after-treatment device to be connected downstream of the supercharger and positioned adjacent to it, optimizing the engine room space by inclining the engine's exhaust side to reduce the distance to the after-treatment device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the exhaust gas after-treatment device is installed in the chassis frame behind the cab to accommodate peripheral equipment in the limited engine room space, then the engine room space can be effectively utilized, but the distance from the turbine outlet to the exhaust gas after-treatment device is lengthened, causing the exhaust gas temperature to decrease and the catalyst purification performance to degrade
Solution Approach 1:
The patent repositions the exhaust gas after-treatment device from the conventional location behind the cab to a new location within the engine room, specifically on the exhaust side of the engine. This spatial reconfiguration in a different dimension allows the device to be closer to the turbine outlet while still accommodating other peripheral equipment, thereby maintaining high exhaust gas temperature for catalyst activation while effectively utilizing engine room space.
2Adaptability or versatility
If the exhaust gas after-treatment device is positioned far from the turbine outlet, then the engine room space can accommodate more peripheral equipment, but the catalyst temperature remains below activation temperature, degrading purification performance
Solution Approach 1:
The patent applies local quality by selectively positioning the exhaust gas after-treatment device in a specific location within the engine room - on the exhaust side of the engine near the turbine outlet. This localized placement ensures that the catalyst receives sufficiently hot exhaust gas for activation and effective operation, while the rest of the engine room maintains its capacity to accommodate other peripheral equipment, thus achieving both adaptability and reliability.
3Reliability
If the engine is mounted with the exhaust system adjacent to one side surface, then the distance to the exhaust gas after-treatment device is shortened and purification performance is enhanced, but the engine mounting structure becomes more complex
Solution Approach 1:
The patent merges the exhaust system and the exhaust gas after-treatment device into a closely integrated arrangement within the engine room. By positioning the after-treatment device adjacent to the engine's exhaust side and shortening the connecting exhaust pipe, the system achieves efficient catalyst purification performance while the integrated design actually simplifies the overall mounting structure compared to conventional separate installations.
Data Source
Figure 1~2
AI summary
Provided is an engine mounting structure for a cab-over type vehicle wherein an engine 10 is mounted on a left and right pair of chassis frame members 3L, 3R extending in the front-rear direction of the vehicle body, and wherein a cab 2 is disposed above the engine 10. The engine 10 has exhaust system connected to either the left or right side surface of the engine 10, and the engine 10 is mounted on the chassis frame members 3L, 3R at a predetermined angle so that the either the left or right side surface faces upward.