Patent ID: 9321448
Filing Date: 2016-04-26
CPC Classification: B60W,F16H,Y10T

Claim Text:
1. A vehicle drive system comprising: a transmission including a clutch configured to be arranged between a drive shaft receiving the engine torque and the input shaft, the clutch selectively connecting the drive shaft and the input shaft; and a shift execution portion operating the shift actuator to control the connecting portion in an engaged state engaged with the idler gear of a present gear stage to disengage from the idler gear of the present gear stage while decreasing the engine torque at a substantially constant first rate while the clutch is still engaged, across a first period between a first time when a shift operation from the present gear stage to a subsequent gear stage is executed and a second time when a driving of the shift actuator in a direction toward a neutral position at which the connecting portion is disengaged from the plurality of idler gears is started, wherein the shift execution portion, after decreasing the engine torque to a reference torque during the first period, at the second time operates the shift actuator to control the connecting portion in the engaged state engaged with the idler gear of the present gear stage to disengage from the idler gear of the present gear stage by operating the shift actuator while decreasing the engine torque at a substantially constant second rate across a second period between the second time and a third time at which the shift actuator is brought into a neutral position, and wherein the shift execution portion memorizes the engine torque at a time when movement of the connecting portion is detected as a learned torque and calculates the reference torque based on the learned torque when disengaging the connecting portion in the engaged state engaged with the idler gear of the present gear stage to disengage from the idler gear of the present gear stage.