Search Results

Simulations used to estimate carbon dioxide (CO2) emissions and fuel consumption of medium- and heavy-duty vehicles over prescribed drive cycles often employ engine fuel maps consisting of engine measurements at numerous steady-state operating conditions. However, simulating the engine in this way has limitations as engine controls become more complex, particularly when attempting to use steady-state measurements to represent transient operation. This paper explores an alternative approach to vehicle simulation that uses a “cycle average” engine map rather than a steady state engine fuel map. The map contains engine CO2 values measured on an engine dynamometer on cycles derived from vehicle drive cycles for a range of generic vehicles. A similar cycle average mapping approach is developed for a powertrain (engine and transmission) in order to show the specific CO2 improvements due to powertrain optimization that would not be recognized in other approaches.

A web-based, enterprise-wide system management tool integrating a hierarchical product structure with purchasing, engineering and accounting databases can significantly improve the organization's ability to adapt to change and ultimately, attain project financial goals. This paper describes the fundamental elements of the PCS WEBTRACK tool developed at PACCAR for a systems approach to managing the evolving nature of part costs.