Cummins engine fuel economy increased 5%

The "fuel consumption challenge" test result was officially released on June 25, 2009. The Cummins QSB 6.7 Off-Highway Tier 4 engine and the Tier 3 Tier 3 engine are the same models. In comparison, fuel economy has increased by 5%. This fuel consumption rating is based on a representative series of typical duty cycles measured under normal operating conditions.

This fuel consumption challenge fully validates the results of Cummins' previous conceptual installation, which means that the fuel consumption of machinery and equipment using Cummins' new-generation engines is significantly reduced, while meeting the fourth-phase emission standards of European and American non-highway mobile equipment to be implemented in 2011. (EPA Tier 4 Interim/EU Stage IIIB).

The front loader used for installation and testing selected the same model with 190-200 hp (142-149 kW), which has the characteristics of high work load and high engine load. Different duty cycle tests include short-term and long-term operations in the shortest standby situation, representing the true operating state of the equipment, and a series of shipping and unloading tests, as well as repeated acceleration and braking.

The Cummins 6.7-liter QSB engine participating in the fuel burn challenge uses the same power, peak torque and rated speed. The results prove that the QSB 6.7 Tier 4 engine has not caused the performance loss of the host equipment while improving the fuel economy. In fact, due to the faster response of the QSB6.7 Tier 4 engine, the working cycle time for the loader to complete the test is significantly reduced. The use of Cummins engines as a power source for construction machinery manufacturers can effectively reduce operating costs and increase production efficiency while meeting stricter Tier 4 emissions standards.

Cummins has unique system integration benefits to meet 2011 emission standards, design and manufacture key engine subsystems, and implement process-wide process optimization from intake to post-discharge. A highly integrated approach to resource integration and system control is used to optimize the in-cylinder combustion process, making it cleaner and more efficient.

Burnout Challenge Test Results

The Cummins QSB 6.7 Tier 4 engine installation tests showed that the fuel economy of the operating equipment increased by 5%, which is mainly due to the Cummins particulate filter with active regeneration and self-cleaning functions.

In order to eliminate any possible changes affecting the test results, loaders equipped with Tier 3 and Tier 4 QSB 6.7 engines are all driven by the same driver, and bucket capacity and tire pressure are the same. Each front loader is equipped with a special spare fuel tank, which accurately measures the weight of each tank to record the fuel consumption.

The fuel saving of 5% is the average test result obtained by the equipment under different working cycles. Repeated tests are used every time to ensure the validity of the results.

Simulated fuel consumption analysis

Cummins has launched a service for the OEMs to measure the simulated fuel consumption rate, which is to provide OEMs with fuel-efficient forecasting advice under Tier 4-stage specific work cycle and model conditions. This analysis is conducted at the Cummins Simulator Installation Center. It can assist the host company in the Tier 4 phase of the comprehensive support work in the near future, and strives to find more fuel saving opportunities before placing the prototype installation instructions. The analysis starts with the fuel consumption rate chart and working cycle data of the Tier 3 stage of the equipment. Based on this, the fuel consumption rate of the Tier 4 stage is plotted.

Fuel consumption analysis can be performed quickly to ensure that performance optimization can begin before the prototype is installed, saving the host plant more engineering time and resources. Cummins works with OEMs to understand the need for certain equipment under a specific duty cycle, and to optimally match equipment and engine characteristics during the simulation design phase, thus most effectively achieving fuel savings.

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