Injector Metering Control for Reducing Agent Delivery Accuracy
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Solution Overview
Problem
Existing methods for metering reducing agents in exhaust gas treatment devices for internal combustion engines face challenges in achieving accurate and uniform delivery due to factors like temperature fluctuations and pressure variations, which affect the conversion and distribution of the reducing agent within the exhaust gas treatment device.
Innovation Solution
A method that determines operating parameters of the metering device, calculates injector pressure and opening time based on these parameters, and adjusts the injector operation to ensure precise delivery of the reducing agent, thereby improving the accuracy and uniformity of metering by avoiding pressure fluctuations and accounting for temperature and other influencing factors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the injector opening time is increased to deliver more reducing agent, then the quantity of reducing agent delivered increases, but the pressure fluctuations and delivery accuracy worsen
Solution Approach 1:
The patent applies dynamics by making the injector opening time variable rather than fixed. The control unit dynamically adjusts the opening time based on real-time operating parameters including reducing agent pressure, temperature, and pump speed. This dynamic adjustment allows the system to maintain accurate delivery quantities while adapting to changing pressure conditions, thereby resolving the contradiction between delivering sufficient reducing agent and maintaining delivery accuracy.
Solution Approach 2:
The patent implements feedback by continuously monitoring operating parameters such as reducing agent pressure, temperature, and pump performance, then using this information to adjust the injector opening time. The control unit receives feedback signals from sensors and modifies the injection parameters accordingly, creating a closed-loop system that maintains delivery accuracy despite variations in quantity requirements and operating conditions.
2Productivity
If the reducing agent pressure is increased to improve delivery speed, then the productivity increases, but the pressure fluctuations and metering precision worsen
Solution Approach 1:
The patent applies dynamics by making the injector opening time variable rather than fixed. The control unit dynamically adjusts the opening time based on real-time operating parameters including reducing agent pressure, temperature, and pump speed. This dynamic adjustment allows the system to maintain accurate delivery quantities while adapting to changing pressure conditions, thereby resolving the contradiction between delivering sufficient reducing agent and maintaining delivery accuracy.
Solution Approach 2:
The patent applies parameter changes by adjusting multiple operating parameters simultaneously - including reducing agent pressure, temperature, pump speed, and injector opening time - to optimize the delivery process. The control unit modifies these parameters dynamically based on actual operating conditions, allowing the system to maintain both high productivity and precise metering by coordinating changes across multiple parameters rather than relying on a single fixed setting.
3Quantity of substance
If the injector opening time is extended to compensate for pressure drops, then the quantity of reducing agent delivered increases, but the uniformity of distribution worsens
Solution Approach 1:
The patent applies dynamics by making the injector opening time variable rather than fixed. The control unit dynamically adjusts the opening time based on real-time operating parameters including reducing agent pressure, temperature, and pump speed. This dynamic adjustment allows the system to maintain accurate delivery quantities while adapting to changing pressure conditions, thereby resolving the contradiction between delivering sufficient reducing agent and maintaining delivery accuracy.
Solution Approach 2:
The patent applies mechanics substitution by replacing purely mechanical timing mechanisms with an electronically controlled system. Instead of using fixed mechanical linkages to determine injector opening time, the system uses electronic sensors and a control unit to precisely timing the injector activation based on actual operating conditions. This substitution allows for more precise control of the injection timing, ensuring uniform distribution while maintaining accurate quantity delivery.
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 enhances the precision and consistency of reducing agent delivery, ensuring effective conversion and distribution within the exhaust gas treatment device, even under varying conditions, thereby improving the overall efficiency of the exhaust gas purification process.
Implementation Method 1
the reducing agent is fed into the exhaust gas treatment device in liquid form and initially evaporates in the exhaust gas treatment device
Implementation Method 2
conversion to ammonia can be accomplished with thermal (thermolysis) and/or catalytic (hydrolysis) assistance
Implementation Method 3
conversion to ammonia can be accomplished with thermal (thermolysis) and/or catalytic (hydrolysis) assistance
Data Source
AI summary
A method for metering a reducing agent from a metering device to an exhaust gas treatment device includes initially determining at least one operating parameter of the metering device. An injector pressure at an injector for feeding the reducing agent into the exhaust gas treatment device is then calculated from the at least one operating parameter. Then, an opening time for the injector is calculated, in which at least the injector pressure determined in step b) is used. The injector is then opened for the opening time calculated in step c). A method for setting up or configuring a control unit for a metering device and a motor vehicle having a metering device are also provided.