Vehicle control apparatus

Patent metadata

Field	Value
Publication number	US-2018170390-A1
Application number	US-201715841623-A
Country	US
Kind code	A1
Filing date	Dec 14, 2017
Priority date	Dec 15, 2016
Publication date	Jun 21, 2018
Grant date	—

Abstract

A control apparatus ( 80; 122 ) for a vehicle provided with a motor/generator (MG 2 ; MG) functioning as a drive power source, and a step-variable transmission ( 20; 110 ) which constitutes a part of a power transmitting path between the drive power source and drive wheels ( 28; 116 ) 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 (CB). The control apparatus includes: a torque control portion ( 86 ) configured to control an output torque (Ti) of the drive power source (MG 2 ) during a shifting action of the step-variable transmission ( 40; 110 ) from one of the speed positions to another of the speed positions, on the basis of a required vehicle drive torque (Tidem) corresponding to an operation amount (θacc) of an accelerator pedal, such that a value representing a state of a rotary motion of an input rotary member ( 30 ) of the step-variable transmission coincides with a target value; and a torque limiting portion ( 92 ) configured to limit the required vehicle drive torque to a predetermined lower limit value (Tif) in the process of a shift-up action of the step-variable transmission which is performed by placement of the accelerator pedal in an operated position.

First claim

What is claimed is:

1 . A control apparatus for a vehicle provided with a motor/generator functioning as a drive power source, and a step-variable transmission which constitutes a part of a power transmitting path between the drive power source and vehicle 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, said control apparatus comprising:
a torque control portion configured to control an output torque of the drive power source during a shifting action of the step-variable transmission from one of the plurality of speed positions to another of the plurality of speed positions, on the basis of a required vehicle drive torque corresponding to an operation amount of an accelerator pedal, such that a value representing a state of a rotary motion of an input rotary member of the step-variable transmission coincides with a target value; and a torque limiting portion configured to limit the required vehicle drive torque to a predetermined lower limit value in the process of a power-on shift-up action of the step-variable transmission which is performed by placement of the accelerator pedal in an operated position.

2 . The control apparatus according to claim 1 , further comprising a transmitted-torque setting portion configured to set a transmitted torque to be transmitted through one of the plurality of coupling devices which causes the shifting action to progress, on the basis of said required vehicle drive torque,
and wherein said transmitted-torque setting portion sets said transmitted torque to be transmitted through said one of the plurality of coupling devices in the process of its power-on shift-up action, at a value set on the basis of the required vehicle drive torque at a moment of initiation of the power-on shift-up action, even if said required vehicle drive torque is lowered from said value in the process of the power-on shift-up action.

3 . The control apparatus according to claim 1 , wherein said torque limiting portion terminates the limitation of the required vehicle drive torque when a degree of progress of said power-on shift-up action has reached a predetermined value.

4 . The control apparatus according to claim 2 , wherein said torque limiting portion terminates the limitation of the required vehicle drive torque when a degree of progress of said power-on shift-up action has reached a predetermined value.

5 . The control apparatus according to claim 1 , wherein said torque limiting portion is configured to set said predetermined lower limit of said required vehicle drive torque on the basis of a kind of the power-on shift-up action of said step-variable transmission or a rotating speed of the input rotary member of said step-variable transmission.

6 . The control apparatus according to claim 2 , wherein said torque limiting portion is configured to set said predetermined lower limit of said required vehicle drive torque on the basis of a kind of the power-on shift-up action of said step-variable transmission or a rotating speed of the input rotary member of said step-variable transmission.

7 . The control apparatus according to claim 3 , wherein said torque limiting portion is configured to set said predetermined lower limit of said required vehicle drive torque on the basis of a kind of the power-on shift-up action of said step-variable transmission or a rotating speed of the input rotary member of said step-variable transmission.

8 . The control apparatus according to claim 4 , wherein said torque limiting portion is configured to set said predetermined lower limit of said required vehicle drive torque on the basis of a kind of the power-on shift-up action of said step-variable transmission or a rotating speed of the input rotary member of said step-variable transmission.

9 . The control apparatus according to claim 1 , wherein said vehicle is further provided with an engine also functioning as the drive power source, and a differential mechanism having a first rotary element to which said engine is operatively connected, a second rotary element to which a first motor/generator is operatively connected, and a third rotary element to which an intermediate power transmitting member is connected,
and wherein said motor/generator is a second motor/generator operatively connected to said intermediate power transmitting member, said control apparatus further comprising a transmission shifting control portion configured to implement said shifting action of said step-variable transmission to said another of the plurality of speed positions, by controlling a releasing action of one of said plurality of coupling devices which has been placed in an engaged state before initiation of the shifting action, and an engaging action of another of said plurality of coupling devices which has been placed in a released state before initiation of the shifting action, said torque control portion controlling an output torque of said first motor/generator and an output torque of said second motor/generator during the shifting action of the step-variable transmission, on the basis of an output torque of said engine and a torque to be transmitted through one of said one and said another of the plurality of coupling devices which causes the shifting action to progress, such that an angular acceleration value of said second motor/generator and an angular acceleration value of said engine coincide with respective predetermined target values.

10 . The control apparatus according to claim 2 , wherein said vehicle is further provided with an engine also functioning as the drive power source, and a differential mechanism having a first rotary element to which said engine is operatively connected, a second rotary element to which a first motor/generator is operatively connected, and a third rotary element to which an intermediate power transmitting member is connected,
and wherein said motor/generator is a second motor/generator operatively connected to said intermediate power transmitting member, said control apparatus further comprising a transmission shifting control portion configured to implement said shifting action of said step-variable transmission to said another of the plurality of speed positions, by controlling a releasing action of one of said plurality of coupling devices which has been placed in an engaged state before initiation of the shifting action, and an engaging action of another of said plurality of coupling devices which has been placed in a released state before initiation of the shifting action, said torque control portion controlling an output torque of said first motor/generator and an output torque of said second motor/generator during the shifting action of the step-variable transmission, on the basis of an output torque of said engine and a torque to be transmitted through one of said one and said another of the plurality of coupling devices which causes the shifting action to progress, such that an angular acceleration value of said second motor/generator and an angular acceleration value of said engine coincide with respective predetermined target values.

11 . The control apparatus according to claim 3 , wherein said vehicle is further provided with an engine also functioning as the drive power source, and a differential mechanism having a first rotary element to which said engine is operatively connected, a second rotary element to which a first motor/generator is operatively connected, and a third rotary element to which an intermediate power transmitting member is connected,
and wherein said motor/generator is a second motor/generator operatively connecte

Assignees

• Toyota Motor Co Ltd

Inventors

• Tatsushiro Hiromasa
• Kimura Hiromichi
• Matsubara Tooru
• Shiiba Kazuyuki
• Kitahata Takeshi
• Sasade Shinichi
• Kobayashi Nobufusa
• Yoshikawa Masato
• Kimura Takahiro

Classifications

• B60W10/11

  Stepped gearings · CPC title

• B60W30/19 Primary

  Improvement of gear change, e.g. by synchronisation or smoothing gear shift · CPC title

• B60K6/445

  Differential gearing distribution type · CPC title

• F16H61/0437

  by using electrical signals (F16H61/0403 and F16H61/061 take precedence) · CPC title

• B60W2540/10

  Accelerator pedal position · CPC title