ACERT Technology

ACERT combines proven systems with innovative new technologies to precisely shape the combustion process. It maintains engine performance, efficiency and durability while dramatically reducing emissions. And looking ahead, ACERT is the only diesel emissions technology currently available with a clear path to Tier 4/Stage IIIb compliance.

When the EPA and European Union passed new diesel emissions standards, Caterpillar worked to find and develop a long-term solution - a platform to meet current and future standards while delivering maximum performance and value.

First Cat researchers explored a number of existing technologies. Then they made a breakthrough that pointed the way to an entirely new approach: ACERT technology.

The core concept behind ACERT technology is advanced combustion. ACERT carefully controls the combustion process to reduce pollutant levels while maintaining performance and efficiency.

One of the key breakthroughs in ACERT technology is multiple-injection fuel delivery. The multiple-injection process introduces fuel into the combustion chamber in a number of precisely-controlled "microbursts." Injecting fuel in this way allows for precise shaping of the combustion cycle.

The "brain power" for ACERT technology comes from Cat ADEM 4 electronic controllers. The latest generation of the electronic engine control systems, the Cat ADEM 4 can govern fuel delivery and other engine processes with incredible precision. And it can be programmed to optimize performance for different engines or specific applications.

Advanced air management also plays a critical role in reducing emissions. Tier 3/Stage IIIa off-road engines include crossflows heads and watergated turbochargers. Advantages of wastegated turbo include higher boost levels over the entire operating range resulting in better low-end performance and response. Crossflow heads improve breathing for optimized combustion.

ACERT technology offers a number of advantages over other emissions reduction solutions. The ACERT "building blocks" approach means that each system can be tailored to match a specific engine or even a specific application. All engines with ACERT technology provide full power even at 300 rpm below the engine's maximum rating. This ability to operate efficiently at less than the maximum rpm rating significantly improves fuel efficiency, lowers heat rejection and reduces noise.

More information about ACERT technology can be found on the Caterpillar website.