Description:Complete Specification:
The following specification describes and ascertains the nature of this invention and the manner in which it is to be performed.

Field of the invention:
[0001] The present invention relates to an algorithm for corrosion preventive injection of fuel from a fuel injector nozzle to avoid pitting corrosion in the fuel injector nozzle.

Background of the invention:
[0002] CN109080144 A describes providing a 3D printing nozzle tail end real-time tracking and positioning method based on central point judgment. Firstly, a model is input to a mechanical arm; secondly, the oblique direction of the mechanical arm is detected, two, right facing the oblique direction, of the four cameras which are hung around are started, a two-camera vision system is formed, a tracing algorithm is applied to track a printing nozzle, the tracked region of interest (ROI) is obtained, median filtering and expansion corrosion operations are applied to images in the region to obtain smooth images, then the canny algorithm is applied to obtain the outer contour and abscissas of the tail end of the printing nozzle, a straight line detection method is applied to carry out straight line detection on edge images, the straight lines on both sides of the nozzle are judged, the position of the central point where the straight lines intersect with the abscissas through mathematical calculation, and the position is the tracked and positioned position. According to the method, a good feedback effect can be played, the information of the tail end of the printing nozzle is positioned in time, and the 3D printing trajectory is corrected in real time.

Brief description of the accompanying drawings:
[0003] An embodiment of the disclosure is described with reference to the following accompanying drawing:

[0004] FIG. 1 illustrates an algorithm for corrosion preventive injection to avoid pitting corrosion in a fuel injector nozzle.

Detailed description of the embodiments:
[0005] FIG. 1 illustrates an algorithm 100 for corrosion preventive injection to avoid pitting corrosion in a fuel injector nozzle. The algorithm 100 comprises determining an exhaust gas recirculation rate 110 and an intercooler temperature 120, performing an exhaust gas recirculated air assessment 130, determining an exhaust gas temperature 140, and obtaining a 2D map of exhaust gas temperature vs. nozzle tip temperature 150 of a fuel injector. The algorithm 100 further comprises obtaining an assessment of corrosion tendency from the exhaust gas recirculated air assessment 130 and the exhaust gas temperature vs. nozzle tip temperature of the fuel injector 150, determining a corrosion tendency of the fuel injector 170 based on the assessment of corrosion tendency 160 from the exhaust gas recirculated air assessment 130 and the exhaust gas temperature vs. nozzle tip temperature of the fuel injector 150, calculating a CPI injection quantity 180 based on the corrosion tendency of the fuel injector, and determining an engine speed 190 and an accelerator pedal position 192. The algorithm 100 further comprises performing an engine operating point assessment 195 based on the engine speed 192 and the accelerator pedal position 190, calculating an allowed injection quantity without exceeding P&E limits 198 based on the engine operating point assessment 195, and injecting a minimum of the allowed quantity and the CPI quantity 199 based on the calculation of the allowed injection quantity without exceeding P&E limits 198 based on the engine operating point assessment 195 and the calculated CPI injection quantity 180 based on the corrosion tendency of the fuel injector 170.

[0006] FIG. 1 illustrates an algorithm 100 for corrosion preventive injection to avoid pitting corrosion in a fuel injector nozzle. The algorithm 100 comprises determining an exhaust gas recirculation rate 110 from an exhaust gas recirculation flow path of an internal combustion engine. Therein, an intercooler temperature 120 from an intercooler of the internal combustion engine is determined. Therein, based on the exhaust gas recirculation rate 110 from an exhaust gas recirculation flow path and the intercooler temperature 120 that is determined by the engine control unit, the engine control unit performs an exhaust gas recirculated air assessment 130.

[0007] The engine control unit then determines an exhaust gas temperature 140 and plots a 2D map of exhaust gas temperature vs. nozzle tip temperature 150 of a fuel injector. Based on the exhaust gas recirculated air assessment 130 and the exhaust gas temperature vs. nozzle tip temperature of the fuel injector 150, the algorithm 100 further comprises obtaining an assessment of the corrosion tendency of the fuel injector 160. The algorithm 100 therein comprises determining a corrosion tendency of the fuel injector 170 based on the assessment of corrosion tendency from the exhaust gas recirculated air assessment 130 and the exhaust gas temperature vs. nozzle tip temperature of the fuel injector 150. The CPI injection quantity 180 based on the corrosion tendency 170 of the fuel injector is determined.

[0008] The algorithm 100 comprises determining an engine speed 192 and an accelerator pedal position 190. Once the engine speed 192 and the accelerator pedal position 190 is determined, the algorithm 100 further comprises performing an engine operating point assessment 195. The algorithm 100 comprises calculating an allowed injection quantity without exceeding P&E limits 198 based on the engine operating point assessment 195. Based on the calculated allowed injection quantity without exceeding P&E limits 198 based on the engine operating point assessment 195 and the calculated CPI injection quantity 180 based on the corrosion tendency 170 of the fuel injector, the algorithm 100 comprises injecting a minimum of the allowed quantity and the CPI quantity 199 based on the calculation of the allowed injection quantity without exceeding P&E limits 198 based on the engine operating point assessment 195 and the calculated CPI injection quantity 180 based on the corrosion tendency 170 of the fuel injector.

[0009] It should be understood that the embodiments explained in the description above are only illustrative and do not limit the scope of this invention. Many such embodiments and other modifications and changes in the embodiment explained in the description are envisaged. The scope of the invention is only limited by the scope of the claims.
, Claims:We claim:

1. An algorithm (100) for corrosion preventive injection to avoid pitting corrosion in a fuel injector nozzle, the algorithm (100) comprising:
determining an exhaust gas recirculation rate (110) and an intercooler temperature (120);
performing an exhaust gas recirculated air assessment (130);
determining an exhaust gas temperature (140);
obtaining a 2D map of exhaust gas temperature vs. nozzle tip temperature of a fuel injector (150);
obtaining an assessment of corrosion tendency (160) from the exhaust gas recirculated air assessment (130) and the exhaust gas temperature vs. nozzle tip temperature of the fuel injector (150);
determining a corrosion tendency (170) of the fuel injector based on the assessment of corrosion tendency (160) from the exhaust gas recirculated air assessment (130) and the exhaust gas temperature vs. nozzle tip temperature of the fuel injector (150);
calculating a CPI Injection quantity based on the corrosion tendency of the fuel injector (180);
determining an engine speed (192) and an accelerator pedal position (190);
performing an engine operating point assessment (195) based on the engine speed (192) and the accelerator pedal position (190);
calculating an allowed injection quantity without exceeding P&E limits (198) based on the engine operating point assessment (195); and
injecting a minimum of the allowed quantity and the CPI quantity (199) based on the calculation of the allowed injection quantity without exceeding P&E limits (198) based on the engine operating point assessment (195) and the calculated CPI Injection quantity (180) based on the corrosion tendency (170) of the fuel injector.