Tractor Bonnet Height Reduction via Forward DPF SCR Placement
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Solution Overview
Problem
Work vehicles equipped with diesel particulate filters (DPF) and selective catalytic reduction (SCR) devices face the challenge of increased bonnet height, which can lead to contact issues with branches and fruits, necessitating a lower bonnet design without compromising the vehicle's performance or increasing width.
Innovation Solution
The DPF and SCR are positioned under and forward of the engine, with an elongated configuration along the up-down direction, and the radiator is inclined and positioned under the bonnet to optimize space, allowing for a reduced bonnet height and width while maintaining cooling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the DPF and SCR are disposed over the engine, then the purification function is achieved, but the bonnet height increases causing contact with branches and fruits
Solution Approach 1:
The patent applies dimensional reconfiguration by changing the spatial arrangement of DPF and SCR from a vertical stacking arrangement (over the engine) to a horizontal arrangement (forward of the engine in the width direction). This dimensional shift allows the purification components to be positioned in previously unused space, reducing bonnet height while maintaining purification functionality.
Solution Approach 2:
The patent segments the engine compartment space by separating the purification function from the engine position. Instead of placing DPF and SCR as a unified block over the engine, they are positioned independently in the width direction forward of the engine, allowing independent optimization of engine cooling and exhaust purification zones.
2Length of moving object
If the DPF and SCR are disposed next to the engine in the width direction, then the purification function is achieved, but the vehicle width increases
Solution Approach 1:
The patent utilizes the front-back dimension (longitudinal direction) by positioning DPF and SCR forward of the engine rather than beside it. This shifts the purification components from the width dimension to the longitudinal dimension, reducing vehicle width while preserving purification capability through strategic positioning in the front section.
3Temperature
If the radiator is positioned to receive ambient air, then cooling efficiency is improved, but heat from DPF and SCR may influence the ambient air
Solution Approach 1:
The patent segments the airflow paths by creating distinct zones: ambient air enters the engine compartment and cools the radiator first, then passes through DPF and SCR. This segmentation ensures that the radiator receives relatively cool ambient air before it gets heated by the purification components, maintaining cooling efficiency.
Solution Approach 2:
The radiator is positioned to receive ambient air before the air reaches the heat-generating DPF and SCR components. This preliminary cooling action ensures that the radiator performs its cooling function using the coolest available air, maximizing thermal efficiency before the air is subsequently heated by exhaust purification.
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 decreases the bonnet height, preventing contact with branches and fruits, maintains the vehicle's field of vision, and improves turning performance without increasing the vehicle's width, while ensuring effective cooling and reduced wind exposure for the DPF and SCR.
Implementation Method 1
a radiator configured to cool a coolant of the engine
Implementation Method 2
a diesel particulate filter configured to purify an exhaust gas of the engine
Implementation Method 3
a selective catalytic reduction configured to purify an exhaust gas of the engine
Data Source
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AI summary
To decrease a height and a width of the bonnet of a work vehicle. A tractor having a bonnet 6 disposed forwardly of a driving operation section and an engine 5 arranged in an interior of the bonnet 6, the tractor comprising: a DPF 21 that collects particulate matter contained in the exhaust gas discharged from the engine 5 and disposed in front of the engine 5 inside the bonnet 6; and an SCR 22 that purifies nitrogen oxides contained in the exhaust gas and disposed in front of the engine 5 inside the bonnet 6.