Hydraulically Actuated HEUI S stems For
Gus Wright’s Students
What is HEUI?
Title, Edition Author(s)
H
Hydraulically actuated
E
Electronic
U
Unit
©
2
2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
What is HEUI?
Title, Edition Author(s)
H
Hydraulically actuated
E
Electronic
U
Unit
©
2
2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
Uses Hydraulics to Pressurize Fuel L I O
Hydraulic Amp li fier Pist on
1th 8
Diameter
Plunger Fuel Under Pressure
ressur ze eng ne o no a cams a
Title, Edition Author(s)
s use ©
3
o n e c ue .
2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
HEUI Advantage Electronic Control Pressurized Fuel to Injection Nozzle
Injection Timing Injection Injection Inje ction Qua Quantity ntity
Intensified Oil Pressure
Pumping Plunger
Injection Pre Injection Pressure ssure Injection Rate Camshaft Ca mshaft Controls 1. How much fuel - how far th e plunger moves.
Camshaft
2. Injection Rate - Rotational speed of cam 3. Injection Injection Timing - When the plunger moves
HEUI System
Title, Edition Author(s)
Conv onve ent ntion iona al Sys yste tem m
ressur zes ue n epen ent y o eng ne spee . ©
4
2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
HEUI – Common Rail HEUI pressurizes fuel
speed = Lower emissions, improved power and fuel Plunger velocities of camshaft actuated fuel
•
engine speeds. •
Poor pressurization and
.
Timing and rate control are fixed in camshaft geometry
•
Title, Edition Author(s)
©
5
2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
HEUI Advantage – Superior Atomization
– especially at low speed and high load conditions. Title, Edition Author(s)
©
6
2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
HEUI Advanta es – Hi her Pressurization
Title, Edition Author(s)
g er pressur za on o ue 22,000 – 30,000 psi (2010 G2 injectors). mproves a om za on, mixing and distribution of fuel in the combustion . Promotes shorter ignition delay and burn time. e er o erance or
©
7
2008 Pearson Education, Upper Saddle River, NJ 07458. All Rights Reserved.
