Control apparatus of transmission and method of controlling transmission

A control apparatus of a transmission, the transmission including a hydraulic pressure unit and being configured to perform shifting operation with use of a control pressure derived from an actuating oil that is to be supplied to the hydraulic pressure unit, the control apparatus being configured to control the transmission, the control apparatus comprising:

• a hydraulic pressure supply source including a plurality of discharge ports that are configured to discharge the actuating oil, the hydraulic pressure supply source having a discharge rate of the actuating oil discharged from the plurality of discharge ports, the discharge rate varying in accordance with a variation in a revolution speed of an engine that is coupled to the transmission;
• a switch control valve configured to switch between a full discharge state and a partial discharge state, the full discharge state being a state in which the actuating oil that is discharged from all of the plurality of discharge ports is supplied to the hydraulic pressure unit, the partial discharge state being a state in which only the actuating oil that is discharged from one or more of the plurality of discharge ports is supplied to the hydraulic pressure unit;
• a control pressure adjusting valve configured to adjust the control pressure that is derived from the actuating oil and that is to be applied to the hydraulic pressure unit;
• an abnormality detector configured to detect an abnormality of the switch control valve;
• and
• a processor configured to control the shifting operation of the transmission to keep the revolution speed of the engine, in an abnormal period in which the abnormality of the switch control valve is detected by the abnormality detector, at a value that is equal to or greater than an abnormal lower limit value, the abnormal lower limit value being higher than a normal lower limit value in a normal period, the normal period being prior to the detection of the abnormality of the switch control valve by the abnormality detector.