Cummins Launches Next-Generation QSB Engines
COLUMBUS, IN — Cummins Inc. next-generation QSB engines were a focus of engine attention at the CONEXPO - CON/AGG show held recently in Las Vegas.
These engines feature enhancements for performance, durability and reduced noise. They not only meet the Environmental Protection Agency (EPA) Tier 3 emissions requirements, but are fully capable of moving forward to the future Tier 4 requirements.
Cummins QSB engines feature advanced electronics, new sculpted blocks, rear gear trains, and High-Pressure Common-Rail fuel systems. The QSB will be available in both a four- and six-cylinder platform. The engines are rated from 110-275 hp (82-205 kW) and are specifically designed to meet the durability, reliability, and power density requirements of premium applications such as excavators, materials handling equipment, and cranes where high performance is essential at every site.
The 6.7L QSB, rated 135-275 hp (101-205 kW), will be in limited production in June 2005; six months ahead of the emissions regulations while the 4.5L QSB, rated 110-170 hp (82-127 kW), will be in limited production in December 2005, a full year ahead of the regulations. The 4.5L QSB has been increased from 130 hp to 170 hp (97-127 kW) from the Tier 2 engine while both versions feature an over 55 percent reduction in sound pressure.
Engine sociability is becoming important not only in North America, but in some areas of the world noise levels are being legislated. To meet these new and impending requirements, Cummins has incorporated enhancements that reduce the noise level of the engines by as much as 9 dBA. The new QSB uses a rear gear train, an enclosed valve tappet cavity, and a sculpted block to reduce the noise level such that the Tier 3 engine is as quiet at full load as its predecessor was without load. This is a benefit not only for meeting global requirements, but also enhances the operator's experience and reduces the potential for fatigue and distraction due to high noise levels.
The Tier 3 QSB engines feature a full authority electronic control, High-Pressure Common-Rail fuel system capable of generating up to 1,600 bar injection pressures which translate to refined and rapid power delivery, reduced noise, and improved cold start. With the new fuel system, maintaining peak injection pressure is no longer dependent on engine speed, load conditions, or fueling capability. Injection pressure can be virtually constant at all speeds, for greater flexibility and precision in controlling both injection rates and timing.
The High-Pressure Common-Rail fuel system is fully integrated with Cummins high-precision electronic management, driven by the CM850 ECM (Electronic Control Module) with a processing speed over twice as fast as the previous ECM. The QSB engine management system continually maintains an optimum balance between load demands, fuel-efficiency and emissions control. The CM850 ECM is designed for isolation from detrimental thermal and vibration loading for extreme reliability and durability.
QSB engines can be integrated into the equipment with PowerMatch software, Cummins OEM-focused application technology. PowerMatch allows the equipment manufacturer to calibrate the engine specifically to the application. Torque curves and ratings can be tuned to optimize performance based on the specific requirements and changing needs of the machine's mission. PowerMatch provides the OEM flexibility in designing a machine optimized for executing the work they perform.