Hydraulic systems in an engine valvetrain having lost motion and/or braking hydraulic circuits are provided with a conditioning circuit that may include a supplemental supply passage, which provides continuous and supplemental supply of hydraulic fluid from a supply source to the braking and lost motion circuits, as well as a venting of the circuits to ambient, such that the hydraulic fluid in these circuits is kept in a refreshed and conditioned state without air contamination. A vented three-way solenoid valve may be utilized. The supplemental supply passage may be provided at various locations in the valvetrain and in the engine head environment. The supplemental supply passage may include flow and pressure control devices to control the flow of the supplemental supply of hydraulic fluid.

Hydraulic systems in an engine valvetrain having lost motion and/or braking hydraulic circuits are provided with a conditioning circuit that may include a supplemental supply passage, which provides continuous and supplemental supply of hydraulic fluid from a supply source to the braking and lost motion circuits, as well as a venting of the circuits to ambient, such that the hydraulic fluid in these circuits is kept in a refreshed and conditioned state without air contamination. A vented three-way solenoid valve may be utilized. The supplemental supply passage may be provided at various locations in the valvetrain and in the engine head environment. The supplemental supply passage may include flow and pressure control devices to control the flow of the supplemental supply of hydraulic fluid.

An engine includes at least one cylinder, a first intake valve and a second intake valve associated with the cylinder, to control a flow of intake air from a first intake duct and a second intake duct, respectively. The two intake ducts communicate with a common intake manifold, so as to receive air at the same pressure. During the intake stage, in each cylinder operating cycle, initially an opening and closing movement of only the first intake valve is activated, while the second intake valve remains closed and, subsequently, an opening and closing movement of only said second intake valve is activated, while the first intake valve remains closed. In this way, the two air flows at the same pressure entering the cylinder give rise to a high turbulent kinetic energy, to the advantage of combustion efficiency and reduction of harmful exhaust emissions.

An engine includes at least one cylinder, a first intake valve and a second intake valve associated with the cylinder, to control a flow of intake air from a first intake duct and a second intake duct, respectively. The two intake ducts communicate with a common intake manifold, so as to receive air at the same pressure. During the intake stage, in each cylinder operating cycle, initially an opening and closing movement of only the first intake valve is activated, while the second intake valve remains closed and, subsequently, an opening and closing movement of only said second intake valve is activated, while the first intake valve remains closed. In this way, the two air flows at the same pressure entering the cylinder give rise to a high turbulent kinetic energy, to the advantage of combustion efficiency and reduction of harmful exhaust emissions.

The invention relates to a reciprocating-piston machine, comprising a valve actuation device for at least one gas exchange valve, at least one valve stroke transmission device, which has at least one valve stroke transmission element, which is arranged between the gas exchange valve and the camshaft and which is mounted for movement between a first Position associated with a closed Position of the gas exchange valve and a second Position associated with an open position of the gas exchange valve, at least one halting device having a halting element mounted for movement between an actuation position and a release position in a machine housing or a housing-fixed component parallel to a guiding surface of the first valve stroke transmission element that the halting element at least shows the displacement motion of the first valve stroke transmission element and releases said displacement motion in the release position.

The invention relates to a reciprocating-piston machine, comprising a valve actuation device for at least one gas exchange valve, at least one valve stroke transmission device, which has at least one valve stroke transmission element, which is arranged between the gas exchange valve and the camshaft and which is mounted for movement between a first Position associated with a closed Position of the gas exchange valve and a second Position associated with an open position of the gas exchange valve, at least one halting device having a halting element mounted for movement between an actuation position and a release position in a machine housing or a housing-fixed component parallel to a guiding surface of the first valve stroke transmission element that the halting element at least shows the displacement motion of the first valve stroke transmission element and releases said displacement motion in the release position.

An engine valve actuating apparatus includes a housing that contains an activation piston bore and an actuation piston bore. The activation piston is disposed in the activation piston bore and configured to actuate an engine valve. The actuation piston includes at least one side surface that is in sliding contact with the inner surface of the actuation piston bore so that the actuation piston can slide within the actuation piston bore. The actuation piston also has a guide mechanism, which guides the first and second links to move in a plane between the first position and the second position. At least a part of the guide mechanism is below at least a part of the at least one side surface of the actuation piston.

A compression release engine in-cylinder braking system, comprising a valve mechanism (I), an oil cylinder device (III), an oil pump device (II), and an oil supply device (IV). The oil cylinder device (III) and the oil pump device (II) of each air cylinder communicate with each other through a pressure transmission oil circuit (L). The pressure transmission oil circuit (L) communicates with the oil supply device (IV) through a low-pressure relief valve (90). An air release valve (200) is arranged at the high end of an oil circuit system. During in-cylinder braking, the air release valve (200) is closed, an electromagnetic reversing valve (80) is energized, engine oil having a pressure of P1 is supplied to the pressure transmission oil circuit (L), and a cam (16) abuts against and pushes the oil pump device (II) to pump high-pressure oil to the oil cylinder device (III), so as to push a rocker arm (12) to open a valve (10), thereby achieving in-cylinder braking. During non-in-cylinder braking, the air release valve (200) is opened, the electromagnetic reversing valve (80) is de-energized, engine oil having a pressure of P2 is supplied to the pressure transmission oil circuit (L), P1 is greater than P2, the oil cylinder device (III) and the oil pump device (II) return respectively, and the cam (16) is out of contact with the oil pump device (II). The compression release engine in-cylinder braking system works stably and reliably, has a simple oil circuit, and is not restricted by the number of engine cylinders.

A compression release engine in-cylinder braking system, comprising a valve mechanism (I), an oil cylinder device (III), an oil pump device (II), and an oil supply device (IV). The oil cylinder device (III) and the oil pump device (II) of each air cylinder communicate with each other through a pressure transmission oil circuit (L). The pressure transmission oil circuit (L) communicates with the oil supply device (IV) through a low-pressure relief valve (90). An air release valve (200) is arranged at the high end of an oil circuit system. During in-cylinder braking, the air release valve (200) is closed, an electromagnetic reversing valve (80) is energized, engine oil having a pressure of P1 is supplied to the pressure transmission oil circuit (L), and a cam (16) abuts against and pushes the oil pump device (II) to pump high-pressure oil to the oil cylinder device (III), so as to push a rocker arm (12) to open a valve (10), thereby achieving in-cylinder braking. During non-in-cylinder braking, the air release valve (200) is opened, the electromagnetic reversing valve (80) is de-energized, engine oil having a pressure of P2 is supplied to the pressure transmission oil circuit (L), P1 is greater than P2, the oil cylinder device (III) and the oil pump device (II) return respectively, and the cam (16) is out of contact with the oil pump device (II). The compression release engine in-cylinder braking system works stably and reliably, has a simple oil circuit, and is not restricted by the number of engine cylinders.

An engine brake rocker arm assembly is operable in an engine drive mode and an engine braking mode and selectively opens first and second exhaust valves. The engine brake rocker arm assembly includes an exhaust rocker arm configured to rotate about a rocker shaft, an engine brake capsule assembly movable between (i) a locked position configured to perform an engine braking operation, and (ii) an unlocked position that does not perform the engine braking operation, and a hydraulically controlled actuator assembly configured to selectively move the engine brake capsule assembly between the first and second positions.