High efficiency, high output transmission having an aluminum housing

An apparatus comprising a torque state description logic that selectively controls a transmission operation based at least in part upon a determination that a shaft displacement angle between at least two shafts of a transmission meets a predetermined program code that indicates the transmission is in one or more of:

• a zero torque region;
• an imminent zero torque region;
• a backlash region;
• an imminent backlash region;
• wherein the shaft displacement angle comprises one or more of:
• input angle comprising an angle value representative of a rotational displacement difference between an input shaft and a countershaft;
• a main box angle comprising a rotational displacement difference between the countershaft and an output shaft;
• and
• an output angle comprising a rotational displacement difference between the input shaft and the output shaft;
• and
• wherein the transmission operation is experiencing a tooth butt event, and wherein the a torque state description logic clears the tooth butt event.

A method for controlling a vehicle based on shaft displacement angle and a zero or imminent zero torque region of a transmission, comprising:

• determining that the transmission is in one of:
• a zero torque region, an imminent zero torque region, a backlash region and an imminent backlash region;
• wherein the determining is based at least in part upon a shaft displacement angle that comprises one or more of:
• an input angle comprising an angle value representative of a rotational displacement difference between an input shaft and a countershaft;
• a main box angle comprising a rotational displacement difference between the countershaft and an output shaft;
• and
• an output angle comprising a rotational displacement difference between the input shaft and the output shaft;
• selectively controlling a transmission operation based at least in part upon the determination;
• and
• wherein the transmission operation is experiencing a tooth butt event, and wherein the controlling the transmission operation clears the tooth butt event.