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US 2019/0338852 A1Published application
Continuously variable transmission control method and continuously variable transmission system
AssigneeNissan Motor Co., Ltd.
InventorsTomoyuki NAKANO, Hiromu TERAI, Ryohey TOYOTA
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Abstract
A continuously variable transmission control method for controlling entry and exit of oil in a primary pulley oil chamber by an electric oil pump disposed in an oil path between the primary pulley oil chamber and a secondary pulley oil chamber, the control method including: comparing a temperature of the electric oil pump with a first threshold; and restricting a shift amount of a continuously variable transmission when the temperature of the electric oil pump is higher than the first threshold.
Claims5
1:
- A continuously variable transmission control method for controlling entry and exit of oil in a primary pulley oil chamber by an electric oil pump disposed in an oil path between the primary pulley oil chamber and a secondary pulley oil chamber, the control method comprising:
- comparing a temperature of the electric oil pump with a first threshold;
- and
- restricting a shift amount of a continuously variable transmission when the temperature of the electric oil pump is higher than the first threshold.
1 more element
2:
- The continuously variable transmission control method according to claim 1, wherein the shift amount of the continuously variable transmission is restricted by setting a lower limit of a speed ratio to a speed ratio larger than a minimum speed ratio to be mechanistically taken by the continuously variable transmission.
3:
- The continuously variable transmission control method according to claim 1, wherein, in a case where the temperature of the electric oil pump is higher than a second threshold that is higher than the first threshold, a shift speed is also restricted in addition to the restriction of the shift amount.
4:
- The continuously variable transmission control method according to claim 3, wherein the restriction of the shift speed is performed such that:
- in a case where the temperature of the electric oil pump is not higher than a third threshold that is higher than the second threshold, only a shift speed when the speed ratio is decreased is restricted;
- and
- in a case where the temperature of the electric oil pump is higher than the third threshold, the shift speed when the speed ratio is decreased and a shift speed when the speed ratio is increased are both restricted.
1 more element
5:
- A continuously variable transmission system comprising:
- an electric oil pump disposed in an oil path between a primary pulley oil chamber and a secondary pulley oil chamber;
- a controlling portion configured to drive the electric oil pump to control entry and exit of oil in the primary pulley oil chamber;
- and
- a temperature acquisition portion configured to acquire a temperature of the electric oil pump, wherein, when the temperature of the electric oil pump is higher than a first threshold, the controlling portion restricts a shift amount of a continuously variable transmission.
2 more elements