Patent ID: 7946154

Claim:
A system for determining a type of hydraulic fluid in a transmission, the system comprising: a valve assembly having a valve moveable between a first position and a second position; a valve position sensor proximate the valve for determining a location of the valve; a hydraulic fluid temperature sensor in communication with the hydraulic fluid for determining a temperature of the hydraulic fluid; and a controller in communication with the valve position sensor and the hydraulic fluid temperature sensor, the controller having control logic including a first control logic for determining an amount of time that elapses when the valve moves from the first position to the second position, a second control logic for sensing a temperature of the hydraulic fluid, a third control logic for comparing the elapsed time to a predefined time value to determine a time difference value, a fourth control logic for comparing the time difference value to a threshold, and a fifth control logic for initiating a signal indicative of a type of the hydraulic fluid if the time difference value exceeds the threshold.