Tài liệu đào tạo của Caterpila về kiểu động cơ C15 ,C18,C27,C32

ACERT
TM
Technology
for Off-Highway C15, C18,
C27 and C32 Engines
ACERT Technology

What does ACERT stand for?

What is ACERT Technology?

What engines are affected?

How is ACERT Technology Different?

What does ACERT Technology look like?

How does ACERT Technology work?

What are the advantages of ACERT Technology?

Is extra maintenance required?
ACERT Technology
What does ACERT stand for?
Advanced
Combustion
Emissions
Reduction
Technology
What is ACERT Technology?


Multiple technologies

Varies by engine family

Varies by engine application
–
Medium duty – specs,
changes, new design
–
Heavy duty – specs, changes,
new design
C15, C18 ACERT
How are the C15 and C18
Affected?
•
C15 and C18 ACERT are based off the C-15
platform
•
C15 displacement changes from 14.6 to 15.2 ltr.
•
Bore remains 137mm
•
Stroke increases from 165mm to 171mm
•
C18 displacement is 18.1 ltr.
•
Bore increases from 137mm to 145mm
•
Stroke increases from 171mm to 183mm
C15, C18 Power Band

Performance
2100 rpm provides
Widest operating
range
Easiest match in
changeover
1800 rpm provides
Best fuel economy
Best heat rejection
Less noise
1300 1500 1700 1900 2100
RPM
POWER
A
B
C
D
E
Full Power from 1800 to 2100 rpm
C15 / C18 Heat Rejection
•
Changing from 2100 rpm’s to 1800 DECREASES heat rejection in
the C15 and maintains same heat rejection in the C18

* kW of heat rejection per kW
of engine power—jacket water
EPA Engine Hp RPM JW* % Change Air % Change
Tier 3 C18 630 1800 0.36 0.0% 0.22 10.0%
Tier 3 C18 630 2100 0.38 5.6% 0.24 20.0%
Tier 2 C-16 630 2100 0.36 0.2

Tier 3 C15 540 1800 0.36 -7.7% 0.21 16.7%
Tier 3 C15 540 2100 0.38 -2.6% 0.23 27.8%
Tier 2 C-15 525 2100 0.39 0.18
Air Jacket Water
C15 / C18 ACERT
C15 / C18 Fuel Efficiency
EPA Engine Hp RPM BSFC % Change
Tier 3 C18 630 1800 219 4.8%
Tier 3 C18 630 2100 228 9.1%
Tier 2 C-16 630 2100 209
Tier 3 C15 540 1800 217 4.0%
Tier 3 C15 540 2100 223 6.9%
Tier 2 C-15 525 2100 208.6
•
Changing from 2100 rpm’s to 1800 fuel economy is
maximized in the C18 and C15
C15 / C18 ACERT
Engine Features
C15, C18 ACERT
Design Strategy
ACERT technology
Few external changes
from Tier 2 / Stage II
Proven heavy duty
workhorse
Easy changeover from
Tier 2 / Stage II
Excellent power density
Design Strategy
ACERT technology

Externally similar to C-15
One installation for wide
power range
Best in class power
density
Design Strategy
•
Increased compression ratio
•
C15 - 18:1 compression ratio
•
C18 – 16.3:1 or 18:1 based on HP rating
•
Component changes to increase peak
cylinder pressure capability
•
Improves cold start characteristics
•
Improves white smoke clean up time
•
Optimizes ACERT performance
ACERT Multiple Injection
Capability
MEUI and ADEM
TM
4
•
Variable injection timing
•
Controls quantity of fuel

•
Optimizes fuel pressure
•
Transient control for
both speeds and loads
Camshaft Changes
•
Revised profile on the injector lobe
•
Difficult to see but it can be felt
•
Facilitates pilot injection capability
•
Injector lobe profile varies depending on HP rating
Areas of higher roller contact
Secondary roller markings
(new with Tier III)
Primary area of roller markings
(similar to Tier II)
Tier 2 – one main area of heavy
roller contact
Tier III – two main areas of
contact
C15, C18, C27, C32 Fuel
System
Mechanical Electronic
Unit Injector
Proven design
Proven high reliability
Enhancements

Multiple injection
Rate shaping
ADEM 4 Electronic Engine
Control
1987
8-bit
PEEC II
1991
Advanced
8-bit
PEEC III
1993
Two 8-bit
ADEM II
1998 32-bit
ADEM III
2004 32-bit
ADEM 4
Generations of Experience
Proven Reliability
ADEM 4
Processing speeds and
memory increased
New 120 Pin engine
connector
Retains 70 Pin OEM
connector
More fuel maps to optimize
ACERT Technology
Better performance

Better efficiency
ADEM 4
No change in OEM / machine
interface
Worldwide service network
Using Cat ET
Common electronics from
C6.6 – C32
Allows greater protection and
prognostics
Full machine integration (Canbus,
J1939, etc.)
New ADEM 4 Features
Throttle input strategy
Multi-throttle capability
Configures throttle input priority
Engine control system options
Full range governor
Min max governor
Speed droop control
Simulates mechanical fuel system
performance
Adjustable from 0-10% droop
New ADEM 4 CAN J1939
Data Link
High speed 2-way communications
Standard SAE link for all C-series
engines
Broadcasts engine performance,
status and diagnostic information

Supports messages for powertrain
integration
Interface with Cat Messenger and
analog gauges
C15, C18 Head bolt torque
sequence
C15, C18 Head Bolt Torque
Procedure
•
Tighten bolts 1-26 in sequence to 270 +/- 15 Nm
•
Tighten bolts 1-26 in sequence to 450 +/- 15 Nm
•
Retighten bolts 1-26 in sequence to 450 +/- 15 Nm
C15, C18, C27, C32
Turbocharger
•
Wastegated turbocharger
•
Provides higher boost over
wide range
•
Single turbo
•
Improves engine
response
•
Outstanding low end
performance
•

Improved peak torque