Bubble detection device in valve body of automatic transmission hydraulic control circuit

摘要

The present invention relates to an air bubble detecting device in a valve body of an automatic transmission hydraulic control circuit, and more particularly, to detect whether air bubbles are contained in transmission oil passing through various valves configured in the valve body of the automatic transmission hydraulic control circuit. An ultrasonic generator for generating an ultrasonic wave having a predetermined frequency, which is installed in a position suitable for detecting bubbles contained in transmission oil flowing in the valve body (10) of an automatic transmission hydraulic control circuit. 20; An ultrasonic detector 25 which is generated by the ultrasonic generator 20 and receives ultrasonic waves passing through the transmission oil and converts the ultrasonic waves into an electrical signal and outputs the electrical signals; An oscillator 30 for oscillating a frequency such that ultrasonic waves having a predetermined frequency are generated through the ultrasonic generator 20; The controller 40 is configured to determine the phase and frequency of the ultrasonic wave detected by the ultrasonic sensor 25 and to determine whether bubbles are contained in the transmission oil in comparison with the oscillation frequency oscillated by the oscillator 30. .