Abstract: A hydraulic circuit for a power transmission device has an oil passage supplying hydraulic pressure of hydraulic fluid to the power transmission device mounted on a vehicle and a hydraulic actuator on which the hydraulic pressure of the hydraulic fluid in the oil passage acts, the oil passage is provided with a concave portion of the inner surface of the oil passage that is recessed upward in the state of mounting on the vehicle. The concave portion is located upstream of the hydraulic actuating portion in the oil passage and above the hydraulic actuating portion when the unit is mounted in the vehicle.

Abstract: A hydraulic control apparatus including a first and second control valves switched to exert hydraulic pressure on a piston to press toward first position, a third and fourth control valves switched to exert hydraulic pressure on the piston to press toward second position and, a CPU. The CPU performs executing a first process controlling the control valves so that hydraulic pressure is exerted by switching of the first, second and third control valves or a second process controlling the control valves so that hydraulic pressure is exerted by switching of the second control valve and determining that the first control valve is failed when movement of the piston to the first position is not detected through the first process and determining that the third control valve is failed when movement of the piston to the first position is not detected through the second process.

Abstract: In an automatic transmission, a shift lever is operable to move to one of a plurality of shift positions corresponding to ranges established as selectable options. The plurality of shift positions are each configured as one of a momentary position allowing the shift lever to automatically return to a home position and a retention position allowing the shift lever to be held therein. A return mechanism for causing the shift lever held in the retention position to return to the home position is provided. The return mechanism is enabled on one of conditions that the parking switch be turned on and that an ignition switch be turned off. In a manual transmission, a return mechanism for causing the shift lever held in a gear stage to return to a home position is provided, and the return mechanism is enabled on condition that an ignition switch be turned off.

Abstract: A gearshift device includes a gearshift lever adapted to move a plurality of gear selection positions, and a gear selection position detecting unit which detects a gear selection position. The gear selection position detecting unit has a magnet plate disposed at a lower end portion of the gearshift lever and movable in accordance with a movement of the gearshift lever and primary magnetic sensors and at least one secondary magnetic sensor, which are disposed so as to oppose to the magnet plate in a non-contact fashion at predetermined positions based on the individual gear selection positions. The primary magnetic sensor detects magnetic flux density and outputs ON/OFF signals in accordance with intensity of the detected magnetic flux density The secondary magnetic sensor detects magnetic flux density and outputs an output value according to the detected magnitude of the magnetic flux density.

Abstract: A gearshift device includes a gearshift lever adapted to move a plurality of gear selection positions, and a gear selection position detecting unit which detects a gear selection position. The gear selection position detecting unit has a magnet plate disposed at a lower end portion of the gearshift lever and movable in accordance with a movement of the gearshift lever and primary magnetic sensors and at least one secondary magnetic sensor, which are disposed so as to oppose to the magnet plate in a non-contact fashion at predetermined positions based on the individual gear selection positions. The primary magnetic sensor detects magnetic flux density and outputs ON/OFF signals in accordance with intensity of the detected magnetic flux density The secondary magnetic sensor detects magnetic flux density and outputs an output value according to the detected magnitude of the magnetic flux density.

Abstract: In an automatic transmission, a shift lever is operable to move to one of a plurality of shift positions corresponding to ranges established as selectable options. The plurality of shift positions are each configured as one of a momentary position allowing the shift lever to automatically return to a home position and a retention position allowing the shift lever to be held therein. A return mechanism for causing the shift lever held in the retention position to return to the home position is provided. The return mechanism is enabled on one of conditions that the parking switch be turned on and that an ignition switch be turned off. In a manual transmission, a return mechanism for causing the shift lever held in a gear stage to return to a home position is provided, and the return mechanism is enabled on condition that an ignition switch be turned off.