Vehicle control apparatus

Patent metadata

Field	Value
Publication number	US-10343508-B2
Application number	US-201715831593-A
Country	US
Kind code	B2
Filing date	Dec 5, 2017
Priority date	Dec 20, 2016
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

A vehicle control apparatus includes: a transmission shifting control portion configured to implement a shifting action of a step-variable transmission by controlling a releasing coupling device and an engaging coupling device; a hybrid control portion configured to control an output torque of a first motor/generator and an output torque of a second motor/generator, based on an output torque of an engine and a transmitted torque to be transmitted through an initiative coupling device, such that a rotational acceleration value of the second motor/generator and a rotational acceleration value of the engine are changed along respective target trajectories during the shifting action; and a target-trajectory setting portion configured to set the target trajectories, based on a maximum charging amount of an electric power that is chargeable to an electric power storage device and a maximum discharging amount of the electric power that is dischargeable from the electric power storage device.

First claim

What is claimed is:

1. A control apparatus for a vehicle provided with: (i) an engine; (ii) a first motor/generator; (iii) a second motor/generator which is operatively connected to an intermediate power transmitting member; (iv) a differential mechanism having a first rotary element to which the engine is operatively connected, a second rotary element to which the first motor/generator is operatively connected, and a third rotary element to which the intermediate power transmitting member is connected; (v) a step-variable transmission which constitutes a part of a power transmitting path between the intermediate power transmitting member and drive wheels and which is placed in a selected one of a plurality of speed positions with engagement of a selected one or ones of a plurality of coupling devices; and (vi) an electric power storage device to and from which an electric power is supplied from and to the first motor/generator and the second motor/generator,
said control apparatus comprising:
a transmission shifting control portion configured to implement a shifting action of the step-variable transmission from one of the plurality of speed positions to another of the plurality of speed positions, by controlling a releasing action of a releasing coupling device and an engaging action of an engaging coupling device, the releasing coupling device being one of the plurality of coupling devices which has been placed in an engaged state before initiation of the shifting action, the engaging coupling device being another of the plurality of coupling devices which is to be placed in the engaged state after completion of the shifting action;
a hybrid control portion configured to control an output torque of the first motor/generator and an output torque of the second motor/generator, based on an output torque of the engine and a transmitted torque to be transmitted through an initiative coupling device that is one of the releasing coupling device and the engaging coupling device, which causes the shifting action to progress, such that a rotational acceleration value of the second motor/generator and a rotational acceleration value of the engine are changed along respective target trajectories during the shifting action of the step-variable transmission; and
a target-trajectory setting portion configured to set the target trajectories of the rotational acceleration value of the second motor/generator and the rotational acceleration value of the engine, based on a maximum charging amount of the electric power that can be charged to the electric power storage device and a maximum discharging amount of the electric power that can be discharged from the electric power storage device.

2. The control apparatus according to claim 1 ,
wherein, during a power-on shift-up action of the step-variable transmission which is performed with an accelerating member of the vehicle being placed in an operated position, or during a power-off shift-down action of the step-variable transmission which is performed with the accelerating member being placed in a non-operated position, said hybrid control portion is configured to control the output torque of the first motor/generator and the output torque of the second motor/generator, based on the output torque of the engine and the transmitted torque to be transmitted through the engaging coupling device as the initiative coupling device, and
wherein, during a power-off shift-up action of the step-variable transmission which is performed with the accelerating member being placed in the non-operated position, or during a power-on shift-down action of the step-variable transmission which is performed with the accelerating member being placed in the operated position, said hybrid control portion is configured to control the output torque of the first motor/generator and the output torque of the second motor/generator, based on the output torque of the engine and the transmitted torque to be transmitted through the releasing coupling device as the initiative coupling device.

3. The control apparatus according to claim 2 , wherein said target-trajectory setting portion is configured, when the power-off shift-up action of the step-variable transmission is implemented with the maximum charging amount of the electric power being not larger than a lower limit value, to shift the target trajectory of the rotational acceleration value of the engine toward a positive side, as compared with when the power-off shift-up action is implemented with the maximum charging amount being larger than the lower limit value, such that a rotating speed of the second motor/generator is changed substantially in the same manner as when the power-off shift-up action is implemented with the maximum charging amount being larger than the lower limit value.

4. The control apparatus according to claim 3 , wherein said hybrid control portion is configured to suspend supply of fuel to the engine, when the power-off shift-up action of the step-variable transmission is implemented with the maximum charging amount of the electric power being not larger than the lower limit value.

5. The control apparatus according to claim 3 , wherein said transmission shifting control portion is configured to increase a torque capacity of the step-variable transmission, when the power-off shift-up action of the step-variable transmission is implemented with the maximum charging amount of the electric power being not larger than the lower limit value and without supply of fuel to the engine being suspended.

6. The control apparatus according to claim 2 , wherein said target-trajectory setting portion is configured, when the power-off shift-up action of the step-variable transmission is implemented with the maximum discharging amount of the electric power being not larger than a lower limit value and with supply of fuel to the engine being suspended, to shift the target trajectory of the rotational acceleration value of the second motor/generator toward a negative side, as compared with when the power-off shift-up action is implemented with the maximum discharging amount being larger than the lower limit value, such that a rotating speed of the engine is changed substantially in the same manner as when the power-off shift-up action is implemented with the maximum discharging amount being larger than the lower limit value.

7. The control apparatus according to according to claim 2 , wherein said target-trajectory setting portion is configured, when the power-off shift-down action of the step-variable transmission is implemented with the maximum charging amount of the electric power being not larger than a lower limit value, to shift the target trajectory of the rotational acceleration value of the second motor/generator toward a positive side, as compared with when the power-off shift-down action is implemented with the maximum charging amount being larger than the lower limit value, such that a rotating speed of the engine at a stage at which a difference between an input speed of the step-variable transmission and a post-shifting synchronizing speed becomes not larger than a predetermined value, is changed substantially in the same manner as when the power-off shift-down action is implemented with the maximum charging amount being larger than the lower limit value.

8. The control apparatus according to according to claim 2 , wherein said target-trajectory setting portion is configured, when the power-on shift-up action of the step-variable transmission is implemented with the maximum discharging amount of the electric power being not larger than a lower limit value, to shift the target trajectory of the rotational acceleration value of the second motor/generator toward a negative side, as compared with when the pow

Assignees

• Toyota Motor Co Ltd

Inventors

• Sugiyama Koji
• Kumazaki Kenta
• Kimura Hiromichi
• Shiiba Kazuyuki
• Matsubara Tooru
• Sasade Shinichi
• Kitahata Takeshi
• Kobayashi Nobufusa
• Yoshikawa Masato

Classifications

• Y02T10/6286

  Cross-Sectional Technologies · mapped topic

• B60W10/08

  including control of electric propulsion units, e.g. motors or generators · CPC title

• B60W20/30

  Control strategies involving selection of transmission gear ratio {(control of change speed gearings, together with other vehicle sub-units B60W10/10; HEV transmission gearing B60K6/36; gearings and control thereof F16H)} · CPC title

• B60W10/06 Primary

  including control of combustion engines · CPC title

• B60W10/10

  including control of change-speed gearings · CPC title