Patent ID: 9181849
Filing Date: 2015-11-10
Classification: F01M,F01P

Abstract:
1. A cooling device for an engine including an oil jet device for cooling a piston with oil, the cooling device comprising: a cooling water temperature sensor configured to detect a temperature of the engine; a rotation speed sensor configured to detect rotation speed of the engine; a load sensor configured to detect load of the engine; at least one of a cylinder temperature sensor configured to directly measure a cylinder temperature of the engine and a cylinder head temperature sensor configured to directly measure a temperature of the cylinder head of the engine; a jet nozzle secured in a cylinder block of the engine and configured to inject cooling oil onto the rear face of the piston; an oil cooler disposed upstream of the jet nozzle on a distribution path of the cooling oil; an oil pump located upstream of the oil cooler and configured to pump the cooling oil to the oil cooler; a first switching adjustment valve disposed between the jet nozzle and the oil cooler, and configured to adjust a flow dividing ratio at which the cooling oil from the oil cooler is distributed to the jet nozzle side and to an oil pan side; and a control unit connected to the first switching adjustment valve to control the first switching adjustment valve, and configured to receive detection values from the cooling water temperature, the rotation speed sensor, the load sensor, and the at least one of the cylinder temperature sensor and the cylinder head temperature sensor, the control unit including,