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Impact/Purpose:

Support Light Duty GHG Rule and Mid-term evaluation of this rule.

Description:

The Advanced Light-Duty Powertrain and Hybrid Analysis tool was created by Environmental Protection Agency to evaluate the Greenhouse gas emissions and fuel efficiency from light-duty vehicles. It is a physics-based, forward-looking, full vehicle computer simulator, which is capable of analyzing various vehicle types combined with different powertrain technologies. The software is a freely-distributed, desktop-computer based application, built on MATLAB/Simulink. The first released version of the simulation tool consists of conventional vehicles and is capable of evaluating effects on Greenhouse gas emissions by off-cycle technologies, such as air conditioning, electrical load reduction, road load reduction by active aerodynamics, and engine start-stop. This paper introduces the simulation tool by describing its basic model architecture and presenting underlying physics as well as model formulations. It describes a simulation capability and shows a graphical user interface of the tool, designed for off-cycle technology analysis purposes. Then, it provides model validation results by comparing the simulation outputs with conventional production vehicle test data. It also describes how this tool was used to evaluate effects of off-cycle technologies on Greenhouse gas emissions, thus come up with the off-cycle credits in the rule.

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