Patent ID: 9581240
Date: 2017-02-28
CPC Classifications: F16H

Claim:
1. A control apparatus of an automatic transmission comprising: a first input shaft and a second input shaft that input rotation of a prime motor installed in a vehicle via a first clutch and a second clutch; at least one output shaft arranged in parallel to the first input shaft and the second input shaft; a plurality of first speed-change gear groups that are arranged between the first input shaft and the output shaft, and when engaged with the first input shaft and the output shaft by a first gear engaging mechanism, are capable of changing speed of rotation of the first input shaft input via the first clutch and transferring the rotation to the output shaft; a plurality of second speed-change gear groups that are arranged between the second input shaft and the output shaft and when engaged with the second input shaft and the output shaft by a second gear engaging mechanism, are capable of changing speed of rotation of the second input shaft input via the second clutch and transferring the rotation to the output shaft; a first transfer route made up of the first clutch, the first input shaft, the first gear engaging mechanism, and the first speed-change gear group; a second transfer route made up of the second clutch, the second input shaft, the second gear engaging mechanism, and the second speed-change gear group; an oil pump connected to the prime motor; a first pressure regulating unit that is arranged in a supply oil passage connected to an outlet of the oil pump and is capable of regulating hydraulic pressure of a hydraulic oil discharged from the oil pump; a first switching valve that is arranged downstream of the first pressure regulating unit in the supply oil passage, is capable of switching supply of the hydraulic pressure of the hydraulic oil regulated by the first pressure regulating unit among a first plurality of oil passages, when being at a position connected to a first oil passage of the first plurality of oil passages, supplies the hydraulic pressure of the hydraulic oil to the second clutch, when being at a position connected to a second oil passage of the first plurality of oil passages, supplies the hydraulic pressure of the hydraulic oil to the second gear engaging mechanism in the second transfer route and causes any one of speed-change gears of the second speed-change gear group including a speed-change gear with a minimum transmission ratio to engage with the second input shaft and the output shaft; a first switching unit that when energized, switches the first switching valve from the position connected to the first oil passage to the position connected to the second oil passage; an anomaly determination unit that determines whether high-pressure anomaly has occurred in the first pressure regulating unit, the high-pressure anomaly causing the first pressure regulating unit to perform regulation to high pressure only; and an energization interrupting unit that when the anomaly determination unit determines that the high-pressure anomaly has occurred in the first pressure regulating unit and when the first switching valve is at the position connected to the first oil passage and supplies the hydraulic pressure of the hydraulic oil to the second clutch, interrupts energization to the first switching unit before failure of the first switching valve to prevent engagement of the speed-change gear with the minimum transmission ratio of the second gear engaging mechanism.