C A T I N D U S T R I A L E N G I N E S W I T H

T H E P O W E R T O L E A D

A C E R T T E C H N O L O G Y

Cat engines with ACERT Technology open a new era in diesel engine design. Using highly-advanced combustion technology to optimizeperformance, these revolutionary engines meettodays most stringent emissions reductionstandards. And theyre poised to take ontomorrows challenges.

ACERT combines proven systems with innovativenew technologies to precisely shape thecombustion process. It maintains engineperformance, efficiency and durability whiledramatically reducing emissions.

And looking ahead, ACERT is the only dieselemissions reduction technology currently availablewith a clear path to Tier 4/Stage IIIb compliance.

Only Cat engines have ACERT Technology.Because only Caterpillar has:

THE POWER TO LEAD

OUR DIRECTION IS CLEARACERT TECHNOLOGY IS THE RIGHT SOLUTION

TODAYWITH THE POWER TO LEAD THEINDUSTRY INTO THE FUTURE.

So its no surprise that when the EPA and European Unionpassed a series of aggressive new diesel engine emissionsstandards in 1994, Caterpillar took a leading role in developingthe technology to meet them.

Through a massive investment of time, expertise and capital(over $500 million so far and counting), Caterpillar worked tofind and develop a long-term solutiona platform to meet current and future standards while delivering maximumperformance and value.

First, Cat researchers explored a number of existingtechnologies. Most were rejected for excessive compromisesin engine performance or for durability/reliability issues. ThenCaterpillar made a breakthrough that pointed the way to anentirely new approach: ACERT Technology.

SINCE 1931, Caterpillar has been a leader in diesel engine

design and manufacturing. In fact, Caterpillar pioneered many

of the most important innovations in diesel technology.

THE ACERT TECHNOLOGY STORY

Cat Engine TechnologyBreakthroughs

ADVANCED COMBUSTIONThe core concept behind ACERTTechnology is advanced combustion.ACERT carefully controls thecombustion process to reduce pollutant levels while maintainingperformance and efficiency.

Meeting emissions is one thing, doingit without compromising engineperformance and reliability is quiteanother. ACERT Technology is the onesolution that has allowed Caterpillar tomeet both of these challenges.

Controlling combustion with a highdegree of precision is extremelydifficultin fact, it has been a goal ofengine designers for decades. Theproblem is, the combustion processinside a diesel engine is very complex,and it changes with variations inengine speed and load. ACERTprovides deep integration and controlof all operating systems, allowingperformance control across a widerange of conditions.

ACERT is a unique combination of building block technologies thatwork together in a highly evolved way for optimum performance across all applications.

FUEL DELIVERYOne of the key breakthroughs in ACERT Technology ismultiple-injection fuel delivery.

The multiple-injection process introduces fuel into thecombustion chamber in a number of precisely-controlledmicrobursts. Injecting fuel in this way allows for preciseshaping of the combustion cycle.

A Cat ADEM 4 controller directs either Cat HEUI, Cat Single Fluid or Cat MEUI injectors to deliver precise quantities of fuel at exactly the right time during combustion. These proprietary Cat injectors can deliver the control and pressure needed for complete combustion.

For optimum performance, the multiple injection processcan be tailored for different applications and engine sizes.

ACERT Technology builds on decades of Caterpillarexperience in diesel engine design and manufacturing. Ittakes advantage of a number of building block enginetechnologies. Some are recent innovations, while others have already proven themselves over millions of hours of use on the job.

On Tier 3/Stage IIIa-compliant off-road Cat engines, ACERTbuilding blocks include:

PROVEN SYSTEMS.BREAKTHROUGH TECHNOLOGIES.

ACERT BUILDING BLOCKS

ELECTRONICS The brain power for ACERT Technology comes from Cat ADEM 4 electronic controllers.

The latest generation of the electronic engine controlsystems pioneered by Caterpillar in the mid-1980s, the Cat ADEM 4 can govern fuel delivery and other engineprocesses with incredible precision. And it can beprogrammed to optimize performance for different enginesor specific applications. Cat ADEM 4 provides the ability tolink machine performance directly with the engine.

AIR MANAGEMENTAdvanced air management also plays a critical role inreducing emissions. Tier 3/Stage IIIa off-road engines include crossflow heads and wastegated turbochargers.Advantages of wastegated turbos include higher boost levelsover the entire operating range resulting in better low-endperformance and response. Crossflow heads improve breathing for optimized combustion.

ACERT Technology offers a number of advantages over other emissionsreduction solutions.

Application Tailoring The ACERT building blocks approach means that each system can betailored to match a specific engine oreven a specific application. In all cases,these building block elements are selected to optimize performance in all engine classes.

PerformanceEvery Cat engine with ACERTTechnology meets or exceeds theperformance of the engine it replaces.By matching or exceeding the power andtorque, we can insure machines withACERT Technology meet customer needs.

Wide Power Band PerformanceAll engines with ACERT Technologyprovide full power even at 300 rpmbelow the engines maximum rating. This ability to operate efficiently at lessthan the maximum rpm ratingsignificantly improves fuel efficiency,lowers heat rejection and reduces noise.

Enhanced CombustionWith ACERT Technology, the enginetakes in only cool, clean, fresh aircompared with other approaches thatrecycle dirty exhaust gases. Combustiontemperatures are controlled by precisemultiple injections of fuel.

The ACERT process actually enhancescombustion rather than suppressing it (asin some competitive systems) to keepcombustion temperatures down. As aresult, enhanced engine performance andfuel efficiency are optimized.

Service/Maintenance ContinuityBecause ACERT uses many existingsystems and components, recommendedservice and maintenance routines areconsistent with previous Cat engines.

Long, Reliable Engine LifeEngine life and wear are not affected by the advanced combustion process.ACERT wont cause prematuredegradation of the combustion chamberas may happen with other emissionsreduction solutions. And there are nobulky or unproven add-on components to worry about.

ACERTADVANTAGES

C15/C18bkW bhp rpm

C15 328-444 440-595 1800-2100C18 429-585 575-785 1800-2100

CATERPILLAR DIESEL

C11/C13bkW bhp rpm

C11 242-336 352-450 1800-2100C13 278-388 385-520 1800-2100

C9bkW bhp rpm205-280 275-375 1800-2200

C6.6bkW bhp rpm186 250 2200

Plus, they take advantage of C-Series enhancements:

ACERT Technology

ADEM 4 electronic control

HEUI, Single Fluid, MEUI fuel injectors

Updated valve train components

Crossflow cylinder heads

New noise reduction technologies

Increased compression ratio

Increased peak cylinder pressure and/or increased displacement

With performance and proven reliability, Cat engines have a history of leadership in high power industrial applications. And the new CatC-Series engines with ACERT Technology deliver even betterperformanceoften with improved power densityalong with thepower to lead the industry into the future.

ENGINES FOR INDUSTRIAL APPLICATIONS

Cat C-Series engines build on the strengths of the proven Cat engine line, often retaining many of the core elements of their predecessorsincluding the same installation size for easy changeover.

C7bkW bhp rpm130-224 175-300 1800-2500

ACERT AND THE FUTURE

Caterpillars competitors are pushing their technological

limits to meet Tier 3/Stage IIIa standards. ACERT

Technology meets todays needs while also providing a

clear line of sight to Tier 4/Stage IIIb compliance through

a building block approach to emissions solutions.

Caterpillar will use technologies already in use in

on-highway applications to meet the off-road regulations

in 2010. Advanced air management with variable valve

actuation and series turbocharging, combined with

aftertreatment, provides the key building blocks

for tomorrow.

While some may have to abandon current efforts

and look for entirely new technologies, ACERT gives

Caterpillar a clear strategy for meeting all future

regulatory standards.

A CLEAR PATH AHEAD.

WHAT ACERTMEANS FOR YOUFor all of its advanced technology,ACERT delivers some very easy-to-understand benefits that mean a lot to Cat engine customers:

ACERT means you deal withlargely proven systems that yourservice people already understand.

ACERT means dependable engineswith the reliability, low operatingcosts and long life you expect from Caterpillar.

ACERT means your engines andmachines meet regulatory standardswithout trouble-prone complexity.

ACERT means your people needto adapt to only one new emissionsreduction technology, a technologythat wont become obsolete in just a few years.

ACERT means you can count on your Cat dealer for a singlesolution thats effective across allyour diesel engine applications.

Thousands of Cat engines with ACERT Technology

are currently in service in demanding on-highway

applications. The technology is proving itself everyday,

and customer response has been overwhelmingly positive.

See your Cat dealer to learn more about ACERT. He can show

you which Cat engines with ACERT Technology will work best

to optimize performance and reduce emissions in your

applicationsnow and in the future.

Only Caterpillar has ACERT Technologybecause only

Caterpillar has the history of innovation, resources and

dedication to make it a reality.

THATS THE POWER TO LEAD

T H E R I G H T

S O L U T I O NF O R T O D A Y A N D

T O M O R R O W .

LEDH4624-01

2004 Caterpillar Printed in the U.S.A.