Hardware Control Strategies for the New Family of Electronically Controlled Automatic Transmissions

摘要

One of the major considerations for automotive design innovation over the past several years is the quest for improved fuel economy. The recent surge in the price of oil accentuates this motivation. Acceleration of the adoption of 5-, 6-, and 7-speed automatic transmissions over the typical 3 and 4-speeds that dominate today's market is part of the equation to improve fuel economy. Along with adding more gears, additional, more complex electronics are required to ensure smooth operation and ultimately realization of the expected improvement in fuel economy. This paper reviews the changes in the market, as well as the control electronics for automatic transmissions. Also presented are possible solutions for tighter control and smoother shifting.