Control apparatus for vehicular power transmitting system

摘要

It is provided a control apparatus for a vehicle provided with an electric motor power source, an inverter, an electric motor, an inverter smoothing capacitor, and a step-variable automatic transmission, the control apparatus being configured to implement a torque reduction control, and to implement a torque reduction limitation control to limit reduction of an output torque of the electric motor to within a range in which a terminal voltage of the inverter smoothing capacitor will not exceed a predetermined withstanding voltage of the inverter and to limit the reduction of the output torque by limiting an amount of change of the output torque per unit time during the reduction of the output torque in the torque reduction control, to within a predetermined torque reduction rate limiting range, and wherein the torque reduction rate limiting range is determined upon initiation of a shifting action of the automatic transmission.

主权项

1. A control apparatus for a vehicle provided with an electric motor power source, an inverter, an electric motor connected through said inverter to said electric motor power source, an inverter smoothing capacitor connected to a terminal of said inverter on the side of said electric motor power source to smooth a voltage input from said electric motor power source to the inverter, and a step-variable automatic transmission constituting a part of a power transmitting path between said electric motor and a drive wheel, said control apparatus comprising a torque reduction control portion configured to implement a torque reduction control to temporarily reduce an output torque of said electric motor during a shifting action of said automatic transmission, with respect to an output torque of the electric motor before initiation of the shifting action, said control apparatus further comprising:
a torque reduction limitation control portion configured to implement a torque reduction limitation control to limit reduction of the output torque of said electric motor to within a range in which a terminal voltage of said inverter smoothing capacitor which rises in relation to reduction of the output torque of said electric motor in said torque reduction control will not exceed a predetermined withstanding voltage of said inverter, said torque reduction limitation control portion implements said torque reduction limitation control to limit the reduction of the output torque of said electric motor by limiting an amount of change of the output torque of said electric motor per unit time during the reduction of the output torque of said electric motor in said torque reduction control, to within a predetermined torque reduction rate limiting range in which the terminal voltage of said inverter smoothing capacitor will not exceed said predetermined withstanding voltage, wherein said torque reduction rate limiting range is determined upon initiation of the shifting action of the automatic transmission. wherein said automatic transmission is shifted by a releasing action of a releasing side coupling device and an engaging action of an engaging side coupling device. and wherein said shifting action of said automatic transmission during which said torque reduction control is implemented is a shift-up action, said control apparatus further comprising an engaging force limiting portion configured to reduce a rate of rise of an engaging force of said engaging side coupling device when said torque reduction limitation control is insufficient to prevent the terminal voltage of said inverter smoothinq capacitor from exceeding said withstanding voltage, with respect to a rate of rise of the engaging force when the torque reduction limitation control is sufficient.