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The present production General Motors 2-Mode Hybrid system for full-size SUVs and pickup trucks integrates truck utility functions with a full hybrid system. The 2-mode hybrid system incorporates two electro-mechanical power-split operating modes with four fixed-gear ratios. The combination provides fuel savings from electric assist, regenerative braking and low-speed electric vehicle operation. The combination of two power-split modes reduces the amount of mechanical power that is converted to electric power for continuously variable transmission operation, meeting the utility required for SUVs and trucks. This paper describes how fuel economy functionality was blended with full-size truck utility functions. Truck functions described include: Manual Range Select, Cruise Control, 4WD-Low and continuous high load operation.

Demands for higher fuel economy, performance, reliability, convenience, as well as reduced emissions push the automotive industry to seek electrification of ancillaries and engine augmentations. In cars of the future, throttle actuation, steering, anti-lock braking, rear-wheel steering, active suspension and ride-height adjustment, air-conditioning, and electrically heated catalyst will all benefit from the electrical power system. Therefore, a higher system voltage, such as the proposed 42V, is necessary to handle these new introduced loads. In this paper, an overview of the systems that will benefit from the 42V bus is presented. Effects of the new introduced electrical loads on the electrical power systems of conventional cars are described. Dynamic characteristics of each load for a typical drive cycle are defined. In addition, system level issues and vehicle performances such as fuel economy are addressed.

This paper aims at the modeling and performance simulation of a heavy-duty parallel diesel-hybrid transit bus over a variety of different drive cycles. Based on the simulation results, a comparative analysis is performed on the overall drive train efficiencies for the various driving patterns. The simulations are performed for 7 different driving patterns, which show varying results from the point of view of overall percentage drive train efficiency and performance parameters, such as acceleration and tail pipe emissions. Thus, through the studies conducted in this paper, the main goal is to evaluate the potential of the parallel diesel-hybrid transit bus under investigation. In addition, a critical parameter of the developed hybrid bus is the regenerative energy recovery. It is a well-known fact for hybrid electric vehicles (HEVs) that the regenerative energy recovery potential is primarily dependent on its driving pattern.