SCR Dosing Unit Cooling via Reduced Pump Power
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Solution Overview
Problem
Current SCR systems face overheating issues in the dosing unit after vehicle shutdown, leading to energy inefficiency, noise disturbance, and potential damage to electrical components due to continuous cooling with the pump operating at full power.
Innovation Solution
A method that reduces the operating power of the feed device to 10-30% of its normal power after exhaust flow cessation, maintaining cooling efficiency while minimizing energy consumption and noise, and automatically switches off when necessary, using a reduced power mode until the dosing unit reaches a safe temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If the pump operates at full power to cool the dosing unit after vehicle shutdown, then the cooling effect is sufficient, but energy consumption increases and noise disturbs the driver
Solution Approach 1:
The pump operates at full power during vehicle operation when cooling is most needed, and at reduced power after shutdown when thermal load is lower. This dynamic adjustment of pump power based on operational phase resolves the contradiction between sufficient cooling and energy conservation.
Solution Approach 2:
The system implements periodic cooling phases: intensive cooling during vehicle operation, followed by reduced-power cooling after shutdown. This periodic action pattern allows the system to achieve necessary temperature reduction while minimizing energy consumption during the post-operation phase.
2Temperature
If the pump operates at full power to cool the dosing unit after vehicle shutdown, then the cooling effect is sufficient, but noise disturbance increases
Solution Approach 1:
The pump power is dynamically adjusted based on the operational phase: full power during vehicle operation when thermal load is high, and reduced power after shutdown when thermal load decreases. This dynamic adjustment reduces noise disturbance during the post-operation cooling phase while maintaining adequate temperature control.
3Temperature
If the pump operates continuously at full power, then the dosing unit remains cool, but battery charge level decreases
Solution Approach 1:
The system dynamically adjusts pump operation: continuous full-power operation during vehicle operation when cooling demand is high, and reduced-power operation after shutdown when cooling demand decreases. This dynamic strategy prevents unnecessary battery discharge while maintaining dosing unit temperature within safe limits.
Solution Approach 2:
Instead of continuous full-power operation, the system applies partial power (reduced pump power) during the post-shutdown cooling phase. This partial action is sufficient to reduce thermal load from exhaust components while significantly reducing energy consumption and battery discharge.
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 approach reduces energy consumption by 10-50% compared to traditional methods, prevents overheating and component damage, and minimizes noise disturbance, ensuring effective and efficient cooling of the dosing unit post-exhaust flow cessation.
Implementation Method 1
cooling a reducing agent dosing unit (250) by means of reducing agent supplied to it
Implementation Method 2
a pump adapted to drawing said reductant from the container via a suction hose and to supplying it via a pressure hose to a dosing unit
Data Source
Figure 1~2
Figure 3a~3b
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AI summary
The invention relates to a method for cooling a dosing unit (250) pertaining to SCR systems for exhaust cleaning, comprising the step, after cessation of exhaust flow, of cooling a reducing agent dosing unit (250) by means of reducing agent supplied to it. The method comprises also the step of running a feed device to supply said coolant reducing agent at reduced power compared with ordinary operation. The invention relates also to a computer programme product containing programme code (P) for a computer (200; 210) for implementing a method according to the invention. The invention relates also to an SCR system and a motor vehicle which is equipped with the SCR system.