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US 10,295,052 B2Granted
Vehicle shift control device
AssigneeNissan Motor Co., Ltd.
InventorsAtsushi Tsukizaki, Masato Koga, Hiroyuki Fukuda, Ryohey Toyota, Hidekazu Yagi
Life of this patent
Estimating the term…
Abstract
A vehicle transmission control device is provided in a vehicle having a gear type transmission capable of selecting a plurality of gear shift patterns, and an electric oil pump for supplying lubricating oil to a gear-shifting mechanism. The vehicle transmission control device includes a transmission controller that selects a path having a small load on the lubricated parts from among the plurality of power transmission paths upon detecting a malfunction has occurred in the oil pump to prevent seizing of lubricated parts and damage to gear-shifting mechanism if a malfunction occurs in the oil pump.
Claims6
A vehicle transmission control device for a vehicle comprising
- an internal combustion engine as a power source,
- a transmission having a gear-shifting mechanism that obtains a plurality of gear shift stages by selecting a plurality of power transmission paths, the gear-shifting mechanism comprising a first gear shaft connected to the internal combustion engine, a first power transmission gear that is a planet gear arranged to be connectable to the first gear shaft via an engagement clutch, a second power transmission gear arranged to mesh with the first power transmission gear, a third power transmission gear that is provided on a shaft arranged on an output side of the transmission, a hollow second gear shaft arranged enclosing the first gear shaft, a fourth power transmission gear that is provided on the second gear shaft, a fifth power transmission gear arranged to mesh with the fourth power transmission gear, and a sixth power transmission gear provided on the shaft arranged on the output side of the transmission, and
- an oil pump that supplies lubrication oil to lubricated parts of the gear-shifting mechanism,
- the vehicle transmission control device comprising:
- a transmission controller that is configured to select the plurality of power transmission paths, and
- the transmission controller being further configured such that upon detecting a malfunction has occurred in the oil pump, the transmission controller
- prohibits use of a path among the plurality of power transmission paths in which the engagement clutch is in a neutral position and the power transmitted from the internal combustion engine passes through the first, second, and third power transmission gears, and prohibits use of a path among the plurality of power transmission paths in which the engagement clutch is in a neutral position and the power transmitted from the internal combustion engine passes through the fourth, fifth, and sixth power transmission gears, and
- selects, from among the plurality of power transmission paths, a path in which the engagement clutch is in an engagement position and the power transmitted from the internal combustion engine passes through the first and third power transmission gears.
5 more elements
A vehicle transmission control method for a vehicle comprising
- an internal combustion engine as a power source,
- a transmission having a gear-shifting mechanism that obtains a plurality of gear shift stages by selecting a plurality of power transmission paths, the gear-shifting mechanism comprising a first gear shaft connected to the internal combustion engine, a first power transmission gear that is a planet gear arranged to be connectable to the first gear shaft via an engagement clutch, a second power transmission gear arranged to mesh with the first power transmission gear, a third power transmission gear that is provided on a shaft arranged on an output side of the transmission, a hollow second gear shaft arranged enclosing the first gear shaft, a fourth power transmission gear that is provided on the second gear shaft, a fifth power transmission gear arranged to mesh with the fourth power transmission gear, and a sixth power transmission gear provided on the shaft arranged on the output side of the transmission, and
- an oil pump that supplies lubrication oil to lubricated parts of a gear-shifting mechanism having a plurality of power transmission paths,
- the method comprising:
- detecting whether there is a malfunction in the oil pump, and upon detecting the malfunction in the oil pump,
- prohibiting use of a path among the plurality of power transmission paths in which the engagement clutch is in a neutral position and the power transmitted from the internal combustion engine passes through the first, second, and third power transmission gears,
- prohibiting use of a path in which the engagement clutch is in a neutral position and the power transmitted from the internal combustion engine passes through the fourth, fifth, and sixth power transmission gears, and
- selecting, from among the plurality of power transmission paths, a path in which the engagement clutch is in an engagement position and the power transmitted from the internal combustion engine passes through the first and third power transmission gears.
5 more elements
Dependencies are inferred from the claim text.