Method of determining short term driving tendency and system of controlling shift using the same

A system of controlling shift comprising:

• an accelerator pedal position sensor detecting an accelerator pedal position;
• a vehicle speed sensor detecting a vehicle speed;
• a navigation device configured to provide road information including a gradient of a road;
• a controller receiving information on input variables including the accelerator pedal position, the vehicle speed and the gradient of the road from the accelerator pedal position sensor, the vehicle speed sensor and the navigation device, determining a short term driving tendency of a driver based on the information, and controlling an engine or a transmission according to the short term driving tendency,
• wherein the controller calculates tendencies and output membership function values according to a plurality of fuzzy rules based on the input variables and determines the short term driving tendency based on the tendencies and the output membership function values according to the plurality of fuzzy rules.