Apparatus and method for diagnosing automatic transmission

A method for diagnosing an automatic transmission of a vehicle, the method comprising:

• detecting a vibration signal of a G-sensor, status data of a transmission sensor, and an engine sensor according to time through a diagnosis communication with the vehicle during driving of the vehicle;
• checking an operational element of the automatic transmission for each shifting operation by using a current shift-stage, a target shift-stage, and a shifting time detected as the status data of the transmission sensor;
• measuring a longitudinal vibration signal of the G-sensor to calculate a fluctuation level of the longitudinal vibration signal according to time for the operational element during the driving of the vehicle;
• and
• determining a shift shock event when a value of the longitudinal vibration signal of the G-sensor after adjustment based on driving acceleration of the vehicle exceeds a reference value.

An apparatus for diagnosing an automatic transmission, the apparatus being installed in a vehicle to detect abnormality of an operational element of the automatic transmission during driving of the vehicle, the apparatus comprising:

• a G-sensor configured to measure a vertical vibration signal and a longitudinal vibration signal during driving of the vehicle;
• a transmission sensor configured to measure status data of the automatic transmission;
• and
• a controller configured to check the operational element of the automatic transmission by using a current shift-stage, a target shift-stage, and a shifting time detected as the status data of the transmission sensor, to measure the longitudinal vibration signal of the G-sensor during the driving of the vehicle to calculate a fluctuation level of the longitudinal vibration signal according to time for the operational element, and to determine a shift shock event when a longitudinal vibration signal value of the G-sensor after adjustment based on driving acceleration of the vehicle exceeds a reference value.