Work Vehicle Exhaust Shield for DPF Thermal Management
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Diesel engines in agricultural and construction vehicles face challenges with diesel particulate filters (DPF) due to temperature regulation issues, increased engine size, and heat retention, which affects the performance and reliability of exhaust gas purification systems, leading to potential engine failures and malfunctions.
Innovation Solution
A work vehicle design incorporating a shield with a perforated plate, a heat insulating member, and optimized exhaust gas routing to maintain high exhaust gas temperatures, reduce heat retention, and improve cooling air flow, while securing sensors away from direct heat sources to prevent failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the DPF is mounted close to the engine, then the temperature of exhaust gas supplied to the DPF is maintained high, but the support structure becomes complex and shock proof performance deteriorates
Solution Approach 1:
The exhaust manifold and DPF are integrated into a single combined structure, eliminating the need for separate support structures and complex mounting mechanisms while maintaining close proximity for heat transfer efficiency
Solution Approach 2:
The combined exhaust manifold-DPF structure serves multiple functions: it acts as both the exhaust gas collection system and the particulate filter housing, while also providing structural support and shock absorption capabilities
2Device complexity
If the DPF is mounted apart from the engine, then the support structure is simplified, but the temperature of exhaust gas supplied to the DPF decreases
Solution Approach 1:
The exhaust manifold and DPF are merged into a single structure that maintains thermal coupling while allowing simplified mounting to the vehicle chassis, achieving both thermal efficiency and structural simplicity
3Temperature
If the engine size is increased to accommodate the DPF, then the DPF can be mounted close to the engine, but the cooling air flow deteriorates and heat retention increases
Solution Approach 1:
The engine compartment is segmented into distinct thermal zones with dedicated air flow passages, allowing separate optimization of cooling air flow for the engine while maintaining high temperature environment for the DPF
Solution Approach 2:
Thermal barriers and heat insulation materials are introduced as intermediary elements between the engine and DPF areas, directing cooling air flow away from the DPF while maintaining thermal coupling for exhaust gas heating
4Area of stationary object
If electric components are located adjacent to the exhaust-gas purification device, then space is saved, but the electric components are affected by radiant heat and may fail
Solution Approach 1:
Heat shielding materials and thermal barriers are positioned as intermediary elements between the high-temperature exhaust-gas purification device and adjacent electric components, blocking radiant heat while allowing compact spatial arrangement
Solution Approach 2:
Heat insulation properties are applied locally in specific zones where electric components are mounted near the exhaust system, creating thermal protection zones without affecting the overall compact design
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 solution effectively maintains high exhaust gas temperatures for DPF regeneration, reduces heat retention, and improves thermal efficiency, preventing engine failures and ensuring optimal engine control, thus enhancing the reliability and efficiency of the exhaust gas purification system.
Implementation Method 1
improves the flow of cooling air in the engine compartment
Implementation Method 2
a heat insulating member, and optimized exhaust gas routing to maintain high exhaust gas temperatures, reduce heat retention
Implementation Method 3
the exhaust-gas purification device is a high-temperature heat source. Thus, if electric components such as a pressure sensor and temperature sensors provided on the exhaust-gas purification device are located adjacent to an exhaust-gas purification case, the electric components are affected by radiant heat from the exhaust-gas purification device
Data Source
AI summary
A work vehicle includes an engine, a post-processing device, and a cooling fan. The engine is mounted on a front portion of a travelling machine body. The post-processing device purifies exhaust gas of the engine. The cooling fan water-cools the engine. The cooling fan is located in front of the engine. The cooling fan, the engine, and the post-processing device are covered with a hood. The hood includes a shield. The shield covers a lower section of the post-processing device and one side of the engine. The shield is a perforated plate including a plurality of holes.