Control device and control method of automatic transmission

Abstract

There is a control device and a control method of an automatic transmission including; a plurality of friction engagement devices; a plurality of solenoids whose electrification amount supplied is controlled to adjust engagement force of the friction engagement devices, and which are switched between electrification and non-electrification so as to switch between speed change steps of the automatic transmission; and an abnormality determiner that performs abnormality determination regarding the solenoids based on predetermined condition. The solenoids operate when supplied with an electrification amount that exceeds a predetermined value. The abnormality determination is performed by supplying a solenoid put in a non-electrified state, of the solenoids, with as electrification amount that is less than or equal to the predetermined value.

Dependencies are inferred from the claim text.