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ACERT TM – CATERPILLAR ENGINES, SEPT. 2005

ADVANCED COMBUSTION

 The core concept behind ACERT Technology is advanced combustion. ACERT

carefully controls the combustion process to reduce pollutant levels while

maintaining performance and eciency.

Meeting emissions is one thing, doing it without compromising engine

performance and reliability is uite another. ACERT Technology is the one solution

that has allowed Caterpillar to meet both of these challenges. Controlling

combustion with a high degree of precision is e!tremely dicult"in fact, it has been

a goal of engine designers for decades. The problem is, the combustion process

inside a diesel engine is very comple!, and it changes with variations in engine

speed and load. ACERT provides deep integration and control of all operating

systems, allowing performance control across a wide range of conditions.

ACERT is a uniue combination of building bloc# technologies that wor#

together in a highly evolved way for optimum performance across all applications.$n Tier %&'tage ((()a compliant o*)road Cat engines, ACERT building bloc#s include+

FUEL DELIVERY:

 $ne of the #ey brea#throughs in ACERT Technology is multiple)inection fuel

delivery. The multiple)inection process introduces fuel into the combustion chamber

in a number of precisely)controlled -microbursts. (necting fuel in this way allows

for precise shaping of the combustion cycle. A Cat A/EM 0 controller directs either

Cat 1E2(, Cat 'ingle 3luid or Cat ME2( inectors to deliver precise uantities of fuel

at e!actly the right time during combustion. These proprietary Cat inectors can

deliver the control and pressure needed for complete combustion. 3or optimum

performance, the multiple inection process can be tailored for di*erent applicationsand engine si4es.

ELECTRONICS 

 The -brain power for ACERT Technology comes from Cat A/EM 0 electronic

controllers. The latest generation of the electronic engine control systems pioneered

by Caterpillar in the mid)5678s, the Cat A/EM 0 can govern fuel delivery and other

engine processes with incredible precision. And it can be programmed to optimi4e

performance for di*erent engines or speci9c applications. Cat A/EM 0 provides the

ability to lin# machine performance directly with the engine.

AIR MANAGEMENT

 Advanced air management also plays a critical role in reducing emissions.

 Tier %& 'tage ((()A o*)road engines include cross):ow heads and waste)gated

turbochargers. Advantages of waste)gated turbos include higher boost levels over

the entire operating range resulting in better low)end performance and response.

Cross):ow heads improve breathing for optimi4ed combustion.

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ENGINES FOR INDUSTRIALAPPLICATIONS

CAT ta#es the advantages of the following C)'eries enhancements+

 ; ACERT Technology

; A/EM 0 electronic control

; 1E2(, 'ingle 3luid, ME2( fuel inectors

; 2pdated valve train components

; Cross):ow cylinder heads

;