Transmission control based on knock level

A method of calibrating a transmission of a vehicle including a control module and one or more modules that can detect knock, said method comprising:

• determining a plurality of levels of knock detectable in the vehicle;
• determining a plurality of transmission ratios applicable in the transmission;
• and
• associating the determined transmission ratios with the determined knock levels such that, when one of the knock levels is detected during operation of the vehicle, a transmission ratio associated with the detected knock level may be applied in the transmission.

A system for controlling a vehicle having an engine and a transmission, said system comprising:

• one or more modules that detect knock activity in the engine;
• a control module that selects a transmission ratio map based on the knock activity and controls the transmission based on a transmission ratio from the transmission ratio map;
• wherein said control module determines a knock level based on said detected knock activity and selects the transmission ratio map based on the determined knock level;
• and
• wherein said control module compares said detected knock activity to at least one of a plurality of predetermined knock levels.