Controller and control method for vehicle
AssigneeToyota Jidosha Kabushiki Kaisha
InventorTakahiro Higashi
Life of this patent
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Abstract
A controller for a vehicle that includes an internal combustion includes processing circuitry. The processing circuitry obtains a predicted temperature outside the vehicle and estimates the viscosity of a lubricating oil based on the oil pressure and the oil temperature of the lubricating oil when the internal combustion engine satisfies a specific operation condition. When the processing circuitry determines that there is a likelihood of a cranking failure occurring in the internal combustion engine on condition that the predicted temperature is less than a threshold value that is based on the viscosity, the processing circuitry outputs a notification signal indicating that that there is a likelihood of a cranking failure occurring in the internal combustion engine.
Claims7
A controller for a vehicle that includes an internal combustion engine, the controller comprising:
- processing circuitry configured to execute
- a temperature acquisition process that obtains a predicted temperature outside the vehicle,
- a viscosity estimation process that estimates viscosity of a lubricating oil based on an oil pressure and an oil temperature of the lubricating oil when the internal combustion engine satisfies a specific operation condition, wherein the lubricating oil is supplied to the internal combustion engine to lubricate the internal combustion engine,
- a cranking determination process that determines that there is a likelihood of a cranking failure occurring in the internal combustion engine on condition that the predicted temperature obtained in the temperature acquisition process is less than a threshold value that is based on the viscosity, and
- a notification process that outputs a notification signal indicating that that there is a likelihood of a cranking failure occurring in the internal combustion engine when the cranking determination process determines that there is a likelihood of a cranking failure occurring in the internal combustion engine.
A method for controlling a vehicle that includes an internal combustion engine, the method comprising:
- storing an oil pressure of a lubricating oil for the internal combustion engine as a specified oil pressure when the internal combustion engine satisfies a specific operation condition;
- storing an oil temperature of the lubricating oil as a specified oil temperature when the internal combustion engine satisfies the specific operation condition;
- estimating a specified viscosity of the lubricating oil based on the specified oil pressure and the specified oil temperature;
- correcting the specified viscosity based on a traveled distance of the vehicle from when the lubricating oil is changed;
- setting a threshold value based on the specified viscosity that has been corrected;
- obtaining a predicted temperature outside the vehicle;
- determining that there is a likelihood of a cranking failure occurring in the internal combustion engine when the predicted temperature is less than the set threshold value;
- and
- outputting a notification signal indicating a likelihood of a cranking failure occurring in the internal combustion engine when determined that there is a likelihood of a cranking failure occurring in the internal combustion engine.
Dependencies are inferred from the claim text.