Heui

Heui injector

1. Level 3 Diesel Fuel Systems

2. I’m your instructor, Gord King. 519-857-6039 [email protected] Click on the speaker icon at the centre of the page for sound.

3. Course Sections 1. Hydraulically Actuated Electronic Unit Injection (HEUI) Systems 2. Electronic Unit Pump Systems (EUP) 3. Cummins High Pressure Injection-Time/Pressure (HPI-TP) 4. Common Rail Fuel Systems

4. Marking Homework 5% Term Test 1 20% Term Test 2 20% Practical 1 15% Practical 2 15% Final Exam 25%

5. Let’s get started.

6. Hydraulically Actuated Electronic Unit Injectors The injector plungers are no longer actuated by a cam. The computer is now in control of timing and metering, through control of the injector, and injected fuel pressure, through control of the injection pressure regulator. By having high injection pressures throughout the RPM band, HC emissions are reduced as the injected droplet size is smaller.

7. Homework Read: Chapter 27 HEUI Fuel Systems Medium/Heavy Duty Truck Engines, Fuel and Computerized Management Systems

8. 500 to 4000 psi of oil pressure 40 to 60 psi of fuel pressure

9. The Caterpillar HEUI System

10. Low pressure engine oil enters here. High pressure engine oil to manifold Plunger fuel supply pump Injection Pressure Regulator Low pressure oil return to sump

11. Stand pipe prevents siphoning of oil back to sump on shutdown High pressure relief 4500 psi 7 piston axial piston pump with fixed swash plate

12. Cat ET Actuation Pressure Test

13. Solenoid de-energized High pressure oil inlet is closed Drain to top of cylinder head is open Plunger and intensifier piston move up Charge fuel enters at 40 to 60 psi

14. Solenoid is energized by ECM. The length of time controls the volume of fuel metered Drain is closed High pressure oil inlet is open Intensifier Piston and plunger are pushed down As the surface area of the intensifier piston is 6 times that of the plunger, fuel pressure is 6 times the high pressure oil Needle valve opens at 5000 psi

15. https://www.youtube.com/watch?v=H56Pg49iX4E

16. The International HEUI System

17. Generation II HEUI

18. Fill

19. Main Injection step 1

20. Main Injection Step 2

21. End of Injection

22. Measuring Clean Side Pressure

23. Measuring Dirty Side Pressure

24. Measuring Inlet Restriction

25. Checking for Aeration

26. Priming the Fuel System

27. End of part 1.