System and method of detecting an obstructed pressure line in a diesel exhaust fluid delivery system
AssigneeRobert Bosch GmbH
InventorsAshal J. Shah, Palanimuthu Thalamuthu, Oliver Wintersteller
Life of this patent
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Abstract
A method and system for detecting whether a pressure line in a diesel exhaust fluid (DEF) delivery system has an obstruction. The system includes an electronic control unit with an electronic processor that is configured to receive an unfiltered pressure signal from a pressure sensor; to electronically filter the unfiltered pressure signal to determine a dosing pressure signal; to determine an integrated value based on the dosing pressure signal; and to determine whether the pressure line is obstructed by comparing the integrated value with a predetermined threshold.
Claims20
A method of detecting whether a pressure line in a diesel exhaust fluid (DEF) delivery system has an obstruction, the method comprising:
- receiving an unfiltered pressure signal from a pressure sensor;
- electronically filtering the unfiltered pressure signal to obtain a filtered pressure signal;
- determining a dosing pressure signal based on the filtered pressure signal and the unfiltered pressure signal;
- determining an integrated value based on the dosing pressure signal;
- determining, at an electronic control unit, whether the pressure line is obstructed by comparing the integrated value with a predetermined threshold.
A diesel exhaust fluid (DEF) delivery system for a vehicle comprising:
- a pressure line configured to supply DEF to an exhaust pipe;
- a pressure sensor connected to the pressure line;
- and
- an electronic control unit including an electronic processor communicatively connected to the pressure sensor, the electronic control unit configured to
- receive an unfiltered pressure signal from the pressure sensor;
- electronically filter the unfiltered pressure signal to obtain a filtered pressure signal;
- determine a dosing pressure signal based on the filtered pressure signal and the unfiltered pressure signal;
- determine an integrated value based on the dosing pressure signal;
- determine whether the pressure line is obstructed by comparing the integrated value with a predetermined threshold.
Dependencies are inferred from the claim text.