Control device for vehicle drive system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorTaichi Washio
Life of this patent
Estimating the term…
Abstract
An upshift target turbine rotational speed and a target primary rotational speed are calculated based on a target input shaft rotational speed restricted in a range of an upper limit guard value to a lower limit guard value. Thus, the difference between the upshift target turbine rotational speed and the target primary rotational speed is suitably decreased. When a torque transmission path is switched from a second transmission path to a first transmission path, the difference between an actual turbine rotational speed at a switching start time point and the actual turbine rotational speed at a switching completion time point is reduced.
Claims7
A control device for a vehicle drive system, the vehicle drive system including, between an input shaft to which torque output from a drive power source is transmitted and an output shaft outputting torque to a drive wheel of a vehicle, a continuously variable transmission mechanism, a gear power transmission mechanism having at least one gear ratio, and a clutch mechanism configured to selectively switch between a first transmission path through which the torque transmitted to the input shaft is transmitted to the output shaft via the continuously variable transmission mechanism and a second transmission path through which the torque transmitted to the input shaft is transmitted to the output shaft via the gear power transmission mechanism, the control device comprising an electronic control unit configured to:
- (i) selectively switch between the first transmission path and the second transmission path in accordance with a traveling state of a vehicle,
- (ii) calculate a target input shaft rotational speed, the target input shaft rotational speed being restricted in a range between an upper limit guard value of a rotational speed of the input shaft in the gear power transmission mechanism and a lower limit guard value of the rotational speed of the input shaft in the continuously variable transmission mechanism, and
- (iii) calculate a switching target input shaft rotational speed and a continuously variable transmission target primary rotational speed, the switching target input shaft rotational speed being for switching between the first transmission path and the second transmission path and the continuously variable transmission target primary rotational speed being for controlling a shift ratio of the continuously variable transmission mechanism based on the target input shaft rotational speed.
Dependencies are inferred from the claim text.