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US 2020/0347933 A1Published application
Control method for power transmission device, and control device for power transmission device
AssigneeNissan Motor Co., Ltd.
InventorsTomoyuki NAKANO, Ryohey TOYOTA, Kouichi KOTSUJI
Life of this patent
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Abstract
A control method for a power transmission device includes: determining whether a difference between an actual speed ratio of a variator and a speed ratio at which a movable pulley contacts a stopper is equal to or less than a predetermined value; and performing a switching of a switching valve when being determined that the difference is equal to or less than the predetermined value.
Claims6
-5. (canceled)
A control method for a power transmission device,
- the power transmission device including:
- a continuously variable transmission mechanism configured to perform power transmission between a driving source and driving wheels;
- a first oil passage communicating between a primary pulley oil chamber and a secondary pulley oil chamber of the continuously variable transmission mechanism;
- an electric oil pump provided in the first oil passage;
- a second oil passage branching off from the first oil passage between the electric oil pump and the primary pulley oil chamber and communicating with an oil reservoir;
- a switching valve provided at a branch point of the first oil passage and the second oil passage;
- and
- a third oil passage branching off from the first oil passage between the electric oil pump and the secondary pulley oil chamber and reaching the switching valve,
- the switching valve being configured to switch between two positions of:
- a first position at which at least the first oil passage is set to a communication state;
- and
- a second position at which the second oil passage and the first oil passage on a secondary pulley oil chamber side are set to a communication state with each other and the third oil passage and the first oil passage on the primary pulley oil chamber side are set to a communication state with each other, and
- the control method comprising:
- determining whether a difference between an actual speed ratio of the continuously variable transmission mechanism and a maximum speed ratio or a minimum speed ratio, the maximum speed ratio or the minimum speed ratio being a speed ratio at which an axial movable part of a primary pulley or a secondary pulley of the continuously variable transmission mechanism contacts a stopper, is equal to or less than a predetermined value;
- and
- performing a switching of the switching valve when being determined that the difference is equal to or less than the predetermined value.
13 more elements
A control method for a power transmission device,
- the power transmission device including:
- a continuously variable transmission mechanism configured to perform power transmission between a driving source and driving wheels;
- a first oil passage communicating between a primary pulley oil chamber and a secondary pulley oil chamber of the continuously variable transmission mechanism;
- an electric oil pump provided in the first oil passage;
- a second oil passage branching off from the first oil passage between the electric oil pump and the primary pulley oil chamber and communicating with an oil reservoir;
- a switching valve provided at a branch point of the first oil passage and the second oil passage;
- and
- a third oil passage branching off from the first oil passage between the electric oil pump and the secondary pulley oil chamber and reaching the switching valve,
- the switching valve being configured to switch between two positions of:
- a first position at which at least the first oil passage is set to a communication state;
- and
- a second position at which the second oil passage and the first oil passage on a secondary pulley oil chamber side are set to a communication state with each other and the third oil passage and the first oil passage on a primary pulley oil chamber side are set to a communication state with each other, and
- the control method comprising:
- determining whether there is contact between a stopper and an axial movable part of a primary pulley or a secondary pulley of the continuously variable transmission mechanism;
- and
- performing a switching of the switching valve when being determined that there is the contact.
13 more elements
A control device for a power transmission device,
- the power transmission device including:
- a continuously variable transmission mechanism configured to perform power transmission between a driving source and driving wheels;
- a first oil passage communicating between a primary pulley oil chamber and a secondary pulley oil chamber of the continuously variable transmission mechanism;
- an electric oil pump provided in the first oil passage;
- a second oil passage branching off from the first oil passage between the electric oil pump and the primary pulley oil chamber and communicating with an oil reservoir;
- a switching valve provided at a branch point of the first oil passage and the second oil passage;
- and
- a third oil passage branching off from the first oil passage between the electric oil pump and the secondary pulley oil chamber and reaching the switching valve,
- the switching valve being configured to switch between two positions of:
- a first position at which at least the first oil passage is set to a communication state;
- and
- a second position at which the second oil passage and the first oil passage on a secondary pulley oil chamber side are set to a communication state with each other and the third oil passage and the first oil passage on a primary pulley oil chamber side are set to a communication state with each other, and
- the control device comprising a controller configured to:
- determine whether a difference between an actual speed ratio of the continuously variable transmission mechanism and a maximum speed ratio or a minimum speed ratio, the maximum speed ratio or the minimum speed ratio being a speed ratio at which an axial movable part of a primary pulley or a secondary pulley of the continuously variable transmission mechanism contacts a stopper, is equal to or less than a predetermined value;
- and
- perform a switching of the switching valve when being determined that the difference is equal to or less than the predetermined value.
13 more elements
A control device for a power transmission device,
- the power transmission device including:
- a continuously variable transmission mechanism configured to perform power transmission between a driving source and driving wheels;
- a first oil passage communicating between a primary pulley oil chamber and a secondary pulley oil chamber of the continuously variable transmission mechanism;
- an electric oil pump provided in the first oil passage;
- a second oil passage branching off from the first oil passage between the electric oil pump and the primary pulley oil chamber and communicating with an oil reservoir;
- a switching valve provided at a branch point of the first oil passage and the second oil passage;
- and
- a third oil passage branching off from the first oil passage between the electric oil pump and the secondary pulley oil chamber and reaching the switching valve,
- the switching valve being configured to switch between two positions of:
- a first position at which at least the first oil passage is set to a communication state;
- and
- a second position at which the second oil passage and the first oil passage on a secondary pulley oil chamber side are set to a communication state with each other and the third oil passage and the first oil passage on a primary pulley oil chamber side are set to a communication state with each other, and
- the control device comprising a controller configured to:
- determine whether there is contact between a stopper and an axial movable part of a primary pulley or a secondary pulley of the continuously variable transmission mechanism;
- and
- perform a switching of the switching valve when being determined that there is the contact.
13 more elements
Dependencies are inferred from the claim text.