Examining the Changes in Pressure Regulator Characteristics of Automatic Transmissions After Prolonged Operation

The present paper examines the change in the characteristics of the linear pressure solenoids (electronic pressure regulators), integrated into the automatic transmissions of the 09G/K/M type range found in cars pertaining to the VAG company group, after reaching a certain mileage. Designed and constructed, accordingly, is a specialized hydraulic test bench, complete with an integrated electronic control system for an in-depth analysis of pressure characteristics. The methodology used for testing the solenoids on the bench is specifically tailored to replicate the conditions they encounter within the gearbox itself. Explored, additionally, is the possibility for repairing faulty solenoids and restoring their functionality.