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The demand for secondary braking systems on city transit buses to extend service brake lining life is increasing. To satisfy this demand. Allison Transmission has developed an integral output retarder for the Allison V731 transmission used in city transit buses with future adaptability to the HT700 transmission. The new retarder takes advantage of improved technologies to provide good response and low speed capacity necessary for the demanding city bus vocation. These technologies also allow the simple compact configuration to fit in the restricted space available in angle drive buses.

A new line of automatic electronically controlled transmissions has been undergoing development by Allison Transmission Division. The first of three models in the family has been introduced into production in September, 1991. Extensive efforts in assuring the reliability of the product and in meeting customer needs have resulted in several product modifications over the initially concepted product. Exhaustive efforts in integrating the design and the factory are resulting in major returns on producibility and quality from the production floor reflecting the total ground up approach to design and manufacturing the new World Transmission Family of heavy duty automatic transmissions.

A simplified, modular, and generic simulation model of an automatic transmission has been developed for use in control system development. This model employs a two clutch concept to simulate the range pack of an automatic transmission. As a result, this model can be adapted to any transmission which relies on clutch-to-clutch (oncoming and offgoing) shift transitions. The model simulates rotating clutches as well as stationary clutches by simply setting the proper gear configuration and ratio around the clutch. The model is capable of continuous simulation of the power train by instantaneous change of gear ratio and associated parameters particular to each shift. Lockup clutch and torque converter models are integrated in parallel and represent the alternative power paths between the range pack and engine. Also included are models of the engine, brake, retarder, and road load. An optional hydrostatic steer model is also incorporated.

A new line of on-highway transmissions has been designed and developed by Allison Transmission Division. This new product line, identified as the World Transmission Series (WT), has been designed with emphasis on cost-effectiveness, greater integration with vehicle systems and advanced technology to meet market demands into the 21st century. New design concepts both in power train component arrangement and electronic controls have been coupled utilizing concurrent engineering and systems engineering principles. The result is a customer-driven product line which, when produced by Allison, will exceed world class standards of quality, performance and value.