Metering System Control

The metering system control could be considered as the executing part. It carries out the requirements set by the metering strategy.

This includes both the metering, i.e. injection as well as the supply of the urea-water solution.

The tasks of the metering system control during normal operation are listed in the following:

Metering of the urea-water solution:

• Implementation of the required target quantity of urea-water solution
• Feedback of the implemented actual quantity of urea-water solution.

Supplying urea-water solution:

• Preparation of metering process (filling lines and pressure built-up) under corresponding ambient conditions (temperature)
• Emptying lines during after running
• Heater actuation.

In addition, the metering system control recognizes faults, implausible conditions or critical situations and initiates corresponding measures.