Craig is a founding member and instructor with the International Technical Rescue Association. The underlying theories and mechanisms are also discussed.Craig is a 14+ year Search and Rescue veteran in the Pacific Northwest and is the founder of The Crackerjack Group. This project report evaluates the current state of CVTs and upcoming research and development, set in the context of past development and problems traditionally associated with CVTs. For internal combustion engines this would be 36 percent, while for diesel engines it is 45 percent. This allows the engine to operate at or near its best brake specific fuel consumption rate, which means that the engine is operating at its highest average adiabatic efficiencies. Using a CVT-configured power train, the engine operates at or near maximum load conditions. The operational philosophy of conventional power trains makes it difficult to reach maximum engine fuel efficiency because the opportunities for operating at the lowest fuel consumption or best 'brake specific fuel consumption' are restricted and generally do not agree with the torque and speed conditions imposed on the engine by the vehicle.

Conventional power train configurations consist of an internal combustion engine operating across a wide range of torque and speed conditions and a transmission that has, by comparison, only a few discrete gear ratios. To achieve gains in this area, we have challenged the conventional thinking associated with power train functions and designs. This stems from the fact that transmissions operate over a range of power conditions, such as low speed-high torque to high speed-low torque, as well as through a variety of gear ratios.

To achieve additional fuel economy improvements, we have begun to focus on increasing efficiency in areas where improvements are much more difficult and costly to achieve-largely on power train components such as the transmission. Unfortunately, improving the variables in that equation is becoming increasingly difficult. One hardly needs to be an automotive engineer to understand that the less fuel an engine consumes, the fewer pollutants produced, and the cleaner the air we breathe.

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