Control apparatus for vehicle

Patent metadata

Field	Value
Publication number	US-9829093-B2
Application number	US-201415105990-A
Country	US
Kind code	B2
Filing date	Dec 19, 2014
Priority date	Dec 24, 2013
Publication date	Nov 28, 2017
Grant date	Nov 28, 2017

Abstract

A first transmission mechanism provided on a first power transmission path and a second transmission mechanism provided on a second power transmission path are provided in parallel with each other between a driving force source and a drive wheel. A first clutch mechanism transmits power or interrupts transmission of power in the first power transmission path. A dog clutch equipped with a synchromesh mechanism transmits power or interrupts transmission of power in the second power transmission path. An electronic control unit is configured to, when changing from the first transmission path to the second transmission path a state where the vehicle is stopping or is stationary and in a state where power of the driving force source is transmitted via the first transmission mechanism, actuate the first clutch mechanism and the second clutch mechanism such that the first clutch mechanism is released and the second clutch mechanism engages.

First claim

What is claimed is:

1. A control apparatus for a vehicle, the vehicle including:
a driving force source;
at least one drive wheel;
a first transmission mechanism provided on a first power transmission path, the first power transmission path being defined between the driving force source and the drive wheel;
a second transmission mechanism provided on a second power transmission path, the second power transmission path being defined between the driving force source and the drive wheel, the second transmission mechanism being provided in parallel with the first transmission mechanism;
a first clutch mechanism configured to transmit power or interrupt transmission of power in the first power transmission path; and
a second clutch mechanism configured to transmit power or interrupt transmission of power in the second power transmission path, the second clutch mechanism being a dog clutch equipped with a synchromesh mechanism,
the control apparatus comprising:
an electronic control unit configured to
(a) when the electronic control unit switches transmission of power from the first transmission path to the second transmission path while the vehicle is traveling, actuate the second clutch mechanism and the first clutch mechanism such that the second clutch mechanism engages from a released state and then the first clutch mechanism is released, and
(b) when the electronic control unit switches the transmission of power from the first transmission path to the second transmission path in a state where the vehicle is stopping or is stationary and in a state where power of the driving force source is transmitted to the drive wheel via the first transmission mechanism, actuate the first clutch mechanism and the second clutch mechanism such that the first clutch mechanism is released and the second clutch mechanism engages from a released state.

2. The control apparatus according to claim 1 , wherein
the electronic control unit is configured to, when the electronic control unit switches the transmission of power from the first transmission path to the second transmission path in a state where the vehicle is stopping or is stationary and in a state where power of the driving force source is transmitted to the drive wheel via the first transmission mechanism, release the first clutch mechanism and then engage the first clutch mechanism again.

3. The control apparatus according to claim 2 , wherein
the first transmission mechanism is a continuously variable transmission mechanism, the first clutch mechanism is provided on the drive wheel side with respect to the first transmission mechanism, and
the electronic control unit is configured to, when the electronic control unit switches the transmission of power from the first transmission path to the second transmission path in a state where the vehicle is stopping or is stationary and in a state where power of the driving force source is transmitted to the drive wheel via the first transmission mechanism, upshift the first transmission mechanism in a state where the first clutch mechanism is released and then engage the first clutch mechanism again.

4. The control apparatus according to claim 1 , wherein
a gear ratio that is established by the second transmission mechanism is a lower gear ratio than a lowest gear ratio that is established by the first transmission mechanism, and
the electronic control unit is configured to
(i) when the electronic control unit requires the gear ratio that is lower than the lowest gear ratio that is established by the first transmission mechanism in a state where the vehicle is stopping or is stationary and in a state where power of the driving force source is transmitted to the drive wheel via the first transmission mechanism, switch the transmission of power from the transmission of power via the first transmission mechanism to the transmission of power via the second transmission mechanism, and
(ii) when the electronic control unit does not require the gear ratio that is lower than the lowest gear ratio that is established by the first transmission mechanism in a state where the vehicle is stopping or is stationary and in a state where power of the driving force source is transmitted to the drive wheel via the first transmission mechanism, maintain the transmission of power via the first transmission mechanism.

Assignees

• Toyota Motor Co Ltd

Inventors

• Nitani Hiromitsu
• Ayabe Atsushi
• Sakamoto Kazuya
• Kondo Hiroki
• Fukao Mitsuhiro
• Matsuo Kenji

Classifications

• F16H61/0213 Primary

  characterised by the method for generating shift signals · CPC title

• F16H2061/0474

  by smoothing engagement or release of positive clutches; Methods or means for shock free engagement of dog clutches · CPC title

• B60K17/165

  provided between independent half axles (B60K17/18, B60K17/20 take precedence) · CPC title

• F16H61/04 Primary

  Smoothing ratio shift · CPC title

• B60K17/08 Primary

  of mechanical type · CPC title