Oil jet system for internal combustion engine, and control method for oil jet system
AssigneeToyota Jidosha Kabushiki Kaisha
InventorAkihiro SATO
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Abstract
In an oil jet system that directs an oil jet toward a back face of a piston, when a coolant temperature of an engine has increased to a predetermined temperature in a stopped state of the oil jet, the piston is cooled by starting the oil jet. When a lubricating oil temperature of the engine has decreased to a predetermined temperature in an operated state of the oil jet, a delay time is determined based on a variation amount in engine rotation speed and a variation amount in intake air filling factor during a predetermined period, and the oil jet is stopped after a lapse of the delay time.
Claims10
An oil jet system for an internal combustion engine, the oil jet system comprising:
- an oil jet mechanism configured to direct an oil jet toward a piston of the internal combustion engine;
- and
- an ECU configured to:
- control the oil jet between an operated state and a stopped state;
- in the stopped state of the oil jet, control timing of an oil jet start operation based on a coolant temperature of the internal combustion engine;
- and
- in the operated state of the oil jet, control timing of an oil jet stop operation based on a lubricating oil temperature of the internal combustion engine.
A control method for an oil jet system for an internal combustion engine, the oil jet system including an oil jet mechanism and an ECU, the oil jet mechanism being configured to direct an oil jet toward a piston of the internal combustion engine, the control method comprising:
- controlling, by the ECU, the oil jet between an operated state and a stopped state;
- in the stopped state of the oil jet, controlling, by the ECU, timing of an oil jet start operation based on a coolant temperature of the internal combustion engine;
- and
- in the operated state of the oil jet, controlling, by the ECU, timing of an oil jet stop operation based on a lubricating oil temperature of the internal combustion engine.
Dependencies are inferred from the claim text.