Control device and control method for internal combustion engine

Abstract

A control device for an internal combustion engine including a piston, an oil jet configured to inject oil toward the piston, and an actuator configured to adjust a supply flow rate of the oil to the oil jet. The control device includes an electronic control unit configured to control the actuator such that the supply flow rate under the same engine load and the same engine rotation speed increases as a degree of deterioration of the oil increases.

What is claimed is: 
     
         1 . A control device for an internal combustion engine including a piston, an oil jet configured to inject oil toward the piston, and an actuator configured to adjust a supply flow rate of the oil to the oil jet, the control device comprising
 an electronic control unit configured to control the actuator such that the supply flow rate under the same engine load and the same engine rotation speed increases as a degree of deterioration of the oil increases.   
     
     
         2 . The control device according to  claim 1 , wherein the electronic control unit is configured to control the actuator such that the supply flow rate under the same engine load, the same engine rotation speed, and the same degree of deterioration of the oil increases as a temperature of the oil increases. 
     
     
         3 . The control device according to  claim 1 , wherein the electronic control unit is configured to determine the supply flow rate such that the supply flow rate becomes a minimum amount needed for a temperature of the piston to be lower than a deposit generation temperature depending on the degree of deterioration of the oil. 
     
     
         4 . A control method for an internal combustion engine including a piston, an oil jet configured to inject oil toward the piston, and an actuator configured to adjust a supply flow rate of the oil to the oil jet, the control method comprising
 controlling, by the electronic control unit, the actuator such that the supply flow rate under the same engine load and the same engine rotation speed increases as a degree of deterioration of the oil increases.