Patent ID: 9243526
Filing Date: 2016-01-26
CPC Classification: F01L,F01M

Claim Text:
1. An internal combustion engine comprising: a cylinder including an intake port and an exhaust port; a valve train comprising a deactivatable intake valve positioned in the intake port, a deactivatable exhaust valve positioned in the exhaust port, an intake valve actuating assembly comprising an intake camshaft having an intake cam and a hydraulically adjustable intake cam follower positioned between the intake valve and the intake cam, and an exhaust valve actuating assembly comprising an exhaust camshaft having an exhaust cam and a hydraulically adjustable exhaust cam follower positioned between the exhaust cam and the exhaust valve; and an oil circuit including a variable pump and an electrically controllable pump valve coupled to an inlet of the variable pump, the variable pump providing an output of pressurized oil to a supply line of the oil circuit, a pressure of the oil output by the pump to the supply line being adjustable via the electrically controllable pump valve, the intake cam follower and exhaust cam follower in fluidic communication with an outlet of the variable pump via the supply line, wherein the intake cam follower is connected with the deactivatable intake valve and the exhaust cam follower is connected with the deactivatable exhaust valve when the pressure of the oil in the supply line exceeds a predetermined threshold, and wherein the intake cam follower is disconnected from the deactivatable intake valve and the exhaust cam follower is disconnected from the deactivatable exhaust valve when the pressure of oil in the supply line is below the predetermined threshold.