Dosing Valve Cooling via Shared Pump
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Solution Overview
Problem
Internal combustion engine metering valves, particularly those introducing urea-water solutions into the exhaust train, are susceptible to damage from high temperatures, and existing solutions do not effectively protect these valves while avoiding condensation issues in charge air coolers.
Innovation Solution
A method involving a shared adjustable coolant pump that cools both the metering valve and the charge air cooler, with the coolant pump's capacity and exhaust gas recirculation rate adjusted based on temperature sensors to maintain the metering valve at a safe temperature and prevent condensation in the charge air cooler.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate cooling system for the metering valve is implemented, then the metering valve is protected from high temperatures, but the device complexity increases due to additional pumps or valves
Solution Approach 1:
The patent merges the cooling function for the metering valve with the existing charge air cooler system. The charge air cooler is equipped with an adjustable circulation pump that can direct coolant to both the charge air cooler and the metering valve, eliminating the need for a separate cooling system and reducing device complexity while still protecting the metering valve from high temperatures.
Solution Approach 2:
The charge air cooler is designed to serve multiple functions: cooling the charge air and cooling the metering valve. The adjustable circulation pump enables the same cooling system to handle both tasks, making the cooling system universal and reducing the need for additional dedicated components.
2Object-affected harmful factors
If the charge air cooler is cooled intensively to prevent condensation, then condensation is avoided, but the metering valve may overheat without sufficient cooling
Solution Approach 1:
The patent employs an adjustable circulation pump that can dynamically change its operating characteristics based on system demands. The pump can vary coolant flow distribution to the charge air cooler and metering valve according to operating conditions, allowing intensive cooling of the charge air cooler when needed while ensuring adequate cooling of the metering valve when temperatures are high.
Solution Approach 2:
The circulation pump's operating parameters (flow rate, pressure) are adjusted to optimize cooling distribution. By changing pump parameters, the system can shift coolant flow to prioritize charge air cooler cooling for condensation prevention or redirect it to cool the metering valve when temperature exceeds safe limits.
3Temperature
If the circulation pump capacity is increased to cool the metering valve, then the metering valve temperature is reduced, but the charge air cooler may not receive sufficient coolant and condensation may occur
Solution Approach 1:
The adjustable circulation pump dynamically adapts its operation based on real-time temperature conditions. When the metering valve requires cooling, the pump increases capacity and redirects coolant flow accordingly. When the charge air cooler is at risk of condensation, the pump adjusts flow distribution to ensure adequate coolant supply, preventing condensation while maintaining metering valve cooling when needed.
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 effectively prevents damage to the metering valve from excessive temperatures and avoids condensation in the charge air cooler, ensuring reliable operation and cost-effective cooling without additional pumps or valves.
Implementation Method 1
a coolant is fed to the metering valve as a function of the temperature of the metering valve
Implementation Method 2
the coolant is fed directly to the metering valve and to the charge air cooler
Implementation Method 3
exhaust gases are introduced into the compressor together with the intake air. The compressed charge air is conveyed through the charge air cooler
Data Source
AI summary
The present invention relates to a method for operating an internal combustion engine. The internal combustion engine comprises a charge-air cooler for cooling charge air and comprises a dosing valve. The charge air comprises exhaust gases which are conducted to the charge air cooler, with an adjustable exhaust-gas recirculation rate, from an exhaust tract of the internal combustion engine. In the method, a dosing valve temperature of the dosing valve is determined, and a charge-air temperature of the charge air is detected. Coolant is supplied to the dosing valve and to the charge-air cooler by means of a common adjustable coolant pump as a function of the dosing valve temperature. Furthermore, an exhaust-gas recirculation rate is adjusted as a function of the charge-air temperature and the dosing valve temperature.