Abstract: An apparatus for achieving internal EGR in a four-stroke internal combustion engine which, for each cylinder, has at least one inlet valve and at least one exhaust valve for controlling the connection between combustion chambers in the cylinder and an inlet system and exhaust system respectively. A rotary camshaft with a cam curve is designed to interact with a follower member and has a first lobe portion for generating the normal exhaust valve lift of the engine. The camshaft is provided with a second lobe portion, which has a height measurement over and above its basic curve which falls short of the measurement for normal exhaust valve clearance when driving at low load and accompanying low heat development in the engine. As a result of thermal expansion in the valve mechanism, the height measurement exceeds the measurement for normal exhaust valve clearance when driving at high load and accompanying high heat development in the engine.

Abstract: A failure detection apparatus for preventing erroneous detection due to a degradation of a sensor and thereby accurately performing failure detection of a variable valve timing and lift control system is provided. The detection apparatus detects a failure of a variable valve timing and lift control system in an engine. The detection apparatus detects a vibration inside an engine cylinder, extracts the component of seating sound of the valve from the output signal of the sensor, determines an actual seating time of said valve from the component of seating sound, and calculates a target seating time of said valve based on at least one of a requested lift amount, a requested advance angle, and a requested open angle depending on the operating conditions. The detecting apparatus corrects the actual seating time for a stationary deviation between the actual seating time and the target seating time caused by degradation or unevenness of the sensor.

Abstract: Method for controlling the braking effect during engine braking in an internal combustion engine (10) having an exhaust turbocharger unit (16) with adjustable guide blades for controlling the turbine speed and gas flow. The method includes detection of the engine speed, detection of the adjustment position of the guide blades, measurement either of the charging pressure on the intake side of the engine or the manifold pressure on the exhaust side of the engine, comparison of these data with stored desired values, and adjustment of the guide blades to a desired position which gives a suitable braking effect for the prevailing charging pressure.

Abstract: This method is for controlling the intake and exhaust valves of the cylinders of an internal combustion engine which is capable of operating either in four-stroke positive mode or in two-stroke braking mode. The control means pilot the valves so that at least a first exhaust valve of each cylinder (1) is opened (C43) prior to a first instant (t1) when the piston of said cylinder reaches its top dead center position and so that the first exhaust valve is kept in an open state (C43) with a first lift (L1) and for a first predetermined period of time (?t1), prior to said first instant (t1), and at least an exhaust valve is kept in an open state, with a second lift (L2) higher than the first lift and for a second predetermined period of time (?t2), after the first instant (t1).

Abstract: Systems for, and methods of, controlling exhaust gas temperature in a multi-cylinder internal combustion engine during positive power operation of the engine are disclosed. Control of exhaust gas temperature may be desired to improve emissions performance in the engine, which is often dependent upon exhaust gas temperature. One or more temperature probes may be used to first determine the actual exhaust gas temperature of the engine while it is operated in a positive power mode. Next, an ECM or similar device may be used to determine a temperature difference between the actual exhaust gas temperature and a desired exhaust gas temperature for emissions performance. Based on the determined temperature difference, one or more cylinders of the engine may continue to be operated in positive power mode while one or more cylinders of the engine are switched to operating in a selected engine braking mode.

Abstract: In an engine braking method for a supercharged internal combustion engine, wherein combustion air, which is under boost pressure and is supplied to the cylinders under the control of engine inlet and outlet valves, is compressed in the cylinders and is subsequently discharged into the exhaust tract, engine braking takes place in a two-stroke operating mode.

Abstract: A method for operating an engine in a vehicle, the engine having at least a cylinder, the method comprising generating engine braking torque to stop rotation of the engine in a desired range by opening and closing at least an electrically actuated valve of the cylinder more than once during a cycle of the cylinder.

Abstract: An endothermic engine comprising: a plurality of combustion chambers each provided with at least one valve and a lever (11) adapted to cause the opening of said valve; a camshaft (1) with a plurality of cams adapted to control said levers; a cylinder head having a supporting axle (2) on which a plurality of bushings (16, 16?) are rotationally and eccentrically mounted, each of which rotationally supports one of said levers; an actuator (8) adapted to cause the rotation of said bushings by a predetermined angle; characterised in that said bushings are made reciprocally integral in rotation around said supporting axle by means of a plate (12), preferably formed by a series of overlapping sheets (14), connected rigidly to them at least in the direction of rotation.

Abstract: A method and a device for operating an internal combustion engine improve the response of the internal combustion engine and increase its torque. An exhaust valve of the combustion chamber of the internal combustion engine is opened during a discharge phase of the internal combustion engine for discharging exhaust gas, generated via combustion, from a combustion chamber into an exhaust system of the internal combustion engine. The exhaust valve is closed again and re-opened during this discharge phase.

Abstract: In an intake-air quantity control system of an engine employing a variable valve operating device capable of controlling a cylinder intake-air quantity by variable control of an operating characteristic of an intake valve, in a normal intake-valve operating mode a target operating characteristic of the intake valve is determined based on a target cylinder intake-air quantity calculated based on a target engine torque. In a predetermined high-load range, in particular, at full-load operation, the target operating characteristic is switched to a high-load period valve operating characteristic, preset to be suitable for the predetermined high-load range.

Abstract: The invention relates to a multicylinder internal combustion engine (1) comprising intake valves and exhaust valves that are provided with at least one additional valve (10) for each cylinder (C1, C2, C3, C4, C5, C6), a preferably tubular pressure container (9) with a gas chamber (90) into which extend ducts (11) originating from the valves (10) such that gas can be exchanged between individual cylinders (C1, C2, C3, C4, C5, C6) when the valves (10) are actuated. The pressure container (9) is provided with a device (17) for cooling the quantities of gas exchanged between individual cylinders (C1, C2, C3, C4, C5, C6). In order to increase the cooling capacity, the cooling device (17) encompasses at least one cooling pipe (17) which is axially inserted into the pressure container (9) and is penetrated by coolant. The outer jacket (171) of the cooling pipe (170) borders the gas chamber (90), the gas that is exchanged between individual cylinders (C1, C2, C3, C4, C5, C6) flowing around said outer jacket (171).

Abstract: In a system, a calculating unit calculates a control parameter required for control of an engine based on a valve opening parameter each time a calculating timing repeatedly appears, and stores the control parameter in a predetermined area of the system. A reflecting unit reflects the control parameter in the control of the engine each time a reflecting timing repeatedly appears. A preliminary estimated timing setting unit sets a preliminary estimated timing between an input timing of the switching request and an estimated timing. The estimated timing represents that the valve opening parameter is estimated to be switched from a first value to a second value in response to the input timing of the switching request. A preliminary correcting unit corrects the control parameter based on at least the switched second value of the valve opening parameter when the preliminary estimated timing appears.

Abstract: The invention relates to a method for operating an internal combustion engine of a motor vehicle in engine braking mode, in which the internal combustion engine is operated with at least one unfired cylinder, and the internal combustion engine has variably controllable valve drives for intake and exhaust valves of each cylinder, and a turbocharger device for increasing pressure in the intake tract of the cylinder. The object of the invention is to improve the engine braking characteristic and the response of the turbocharger device. The object is achieved by controlling the intake valves and exhaust valves for setting a specified braking torque that may be set by compressing the air mass in each unfired cylinder.

Abstract: A variable valve actuation system is disclosed for providing exhaust to at least one component downstream of an engine. The system includes an exhaust valve disposed in an engine cylinder and a hydraulic actuation system. The system also includes a braking control valve, a supply of hydraulic fluid operably connected to the hydraulic actuation system, and an exhaust valve actuating device operably connected to the valve actuation system. The exhaust valve actuating device is operable to affect the exhaust valve to open within the engine cylinder. The system further includes a device for controlling a position of the exhaust valve actuating device relative to a position of the exhaust valve. The controlling device is operably connected to the supply of hydraulic fluid.

Abstract: In a multi-cylinder internal combustion engine and a method for operating a multi-cylinder internal combustion engine, cylinders are assigned an exhaust line and, in each case, a gas inlet valve and a gas outlet valve which are used for the charge cycle. At least one of the cylinders of the internal combustion engine has an additional outlet valve through which, in the opened state, a flow connection can be established between the combustion chamber and the exhaust line. At least one of an exhaust gas composition and an exhaust gas temperature is changed compared to the normal operating mode, and regeneration of the exhaust gas cleaning unit can be set in conjunction with a regeneration operating mode for regenerating an exhaust gas cleaning unit which is arranged in the exhaust line by activating the additional outlet valve of at least one cylinder.

Abstract: A controller approximates an output characteristic of an air flow meter using at least one parameter, and approximates a characteristic of a fuel injection characteristic of an injector using at least one parameter. These parameters are determined and updated based on an exhaust air-fuel ratio acquired by an air-fuel ratio sensor disposed in an exhaust passage, so that the exhaust air-fuel ratio approaches a target air-fuel ratio.

Abstract: Methods and apparatus for actuating an engine valve provided between an engine cylinder and an exhaust manifold to provide compression-release engine braking in combination with exhaust gas restriction and brake gas recirculation are disclosed. In a first embodiment of the present invention, the engine valve used to provide brake gas recirculation and compression-release braking may be maintained slightly open between the brake gas recirculation and compression-release events. In another embodiment of the present invention, the cam closing ramp for a main exhaust event may be extended to terminate near the beginning of a brake gas recirculation event to facilitate refilling a hydraulic valve actuation system used to in association with the exhaust valve.

Abstract: In a guide groove of a guide rotator of a valve timing control apparatus, a stopper surface is planar and is positioned in an end of the guide groove. The stopper surface is engageable with a cylindrical outer peripheral surface of a movable body, which is received in the guide groove, to stop the movable body. An arcuate outer connection surface connects between the stopper surface and an outer guide surface and has a radius of curvature, which is smaller than that of the cylindrical outer peripheral surface of the movable body. An arcuate inner connection surface connects between the stopper surface and an inner guide surface and has a radius of curvature, which is smaller than that of the cylindrical outer peripheral surface of the movable body.

Abstract: A method for operating an engine in a vehicle, the engine having at least a cylinder, is described. The method comprises decreasing rotational speed of the engine; and when said engine speed falls in a specified region, adjusting a valve timing of the cylinder to generate one of expansion or compression braking torque to stop rotation of said engine in a desired range.

Abstract: An ECU calculates an engine speed for calculating a camshaft phase based on a time period T? in which a crankshaft rotates a sampling angle ?. The camshaft phase is derived from a time difference between output timing of a cam angle signal and output timing of a crank angle signal based on the engine speed. According as the engine speed is lower, the sampling angle ? becomes small, so that the engine speed and the camshaft phase are precisely calculated.

Abstract: Methods and apparatus for providing bleeder-type and compression-release engine braking in an internal combustion engine are disclosed. For bleeder-type engine braking, the exhaust valve is maintained at a small and relatively constant lift throughout all or much of the engine cycle. The engine braking may be combined with exhaust gas recirculation, variable exhaust brake, and/or operation of a variable geometry turbocharger.

Abstract: An electronic valve actuation system and control method is described. The valve timing is changed between early and late intake valve closing depending on engine operating conditions. Further, valve timing is adjusted to control engine airflow or engine torque. Finally, air-fuel ratio is adjusted based on feedback from an exhaust gas oxygen sensor as well as an estimate of air, fuel, and residual exhausted from cylinders operating with late valve closing (after bottom dead center) timing.

Abstract: Lost motion systems and methods for providing engine valves with variable valve actuation for engine valve events are disclosed. The system may include a master piston hydraulically linked to a slave piston, and a dedicated cam operatively connected to the master piston. The slave piston may be disposed substantially perpendicular to the master piston in a common housing. The slave piston is adapted to actuate one or more engine valves. The slave piston may incorporate an optional valve seating assembly into its upper end. A trigger valve may be operatively connected to the master-slave hydraulic circuit to selectively release and add hydraulic fluid to the circuit.

Abstract: The valve controller is driven by a motor. The valve controller has a control circuit and a driving circuit. The driving circuit drives a motor based on a control signal generated by the control circuit and a rotational position signal generated by a rotational position sensor. The driving circuit generates a rotation number signal representing an actual rotation number of the motor according to the rotational position signal, and transfers the rotation number signal to the control circuit.

Abstract: A linear control valve is disclosed regulating the flow of fluid to hydraulically activated devices, preferably a fuel injector and an engine compression release brake. The valve includes a valve member that is moveable between a first position in which the fuel injector is, at least partially, activated, a second position in which neither the fuel injector nor the engine compression release brake is activated, and a third position in which the engine compression release brake is activated. An electrical actuator providing two permanent magnets and two oppositely wound solenoid coils moves the valve member between its three positions. The polarity of the permanent magnets are oriented such that when the solenoids are energized, one solenoid coil pulls the valve member while the other solenoid coil pushes the valve member in the same direction.

Abstract: In a motor brake for an internal combustion engine having an exhaust valve and an operating mechanism for opening and closing the exhaust valve, the operating mechanism includes a support structure which is firmly connected to, or part of, the internal combustion engine and a pressure element and a valve opening element are movably supported by the support structure so as to transfer a valve opening force to the exhaust valve and a stop structure is provided on the support structure for engaging and supporting the pressure element when the exhaust valve is in the normally closed position or opened for engine braking operation.

Abstract: An engine air brake device for a 4-stroke reciprocating-piston internal combustion engine is provided and has at least one intake valve and two exhaust valves per cylinder. The exhaust train incorporates a throttling device actuatable for engine deceleration so that an exhaust back pressure builds up in the accumulated exhaust gas upstream of the throttling device and becomes effective in conjunction with an engine-internal braking device associated to only one of the two exhaust valves for each cylinder, the other exhaust valve being controlled conventionally. The engine-internal braking device comprises a control piston installed in the valve bridge and pressed in the direction of the exhaust valve from a control pressure chamber supplied with pressurized oil and possibly also by means of an additional control compression spring.

Abstract: A rotary valve internal combustion engine comprising a crankshaft, a throttle (23), a throttle actuator, a cylinder head (7), a combustion chamber (8), and at least one rotary valve (1). The rotary valve (1) having at least two ports (2, 3) terminating as openings (4, 5) in its periphery, the cylinder head (7) having a bore (11) in which the rotary valve (1) rotates, a window (6) in the bore (11) communicating with the combustion chamber (8), the openings (4, 5) successively aligning with the window (6) by virtue of the rotation, a drive mechanism comprising a phase change means (18), the drive mechanism driving the rotary valve (1). The at least two ports (2, 3) comprise an inlet port (2) and an exhaust port (3), and the phase change means (18) applies a phase change in response to changes in the operating conditions of the engine over at least one engine cycle.

Abstract: An engine control practices a method for engine control including detecting an overspeed indication selectively settable in the vehicle, responding to the threshold speed operation, and inhibiting response to the throttle control actuation when engine braking is desired. The engine braking may be enabled when said overspeed operation is maintained beyond its detection in combination with continued throttle actuation.

Abstract: Valve mechanism in an internal combustion engine, includes a valve play-take up mechanism in the form of a piston in a cylinder chamber at one end of an exhaust rocker arm, and a hydraulic circuit with valve elements for supplying or draining off pressure fluid to and from the cylinder chamber. A second cylinder chamber with a piston acting in an opposite direction is arranged in the rocker arm and communicates with the first-mentioned cylinder chamber. A brake rocker arm is mounted on the same rocker arm shaft as the exhaust rocker arm and has an outer end, which acts against the piston in the second cylinder chamber. The brake rocker arm has its own cam element with brake cam lobes to one side of the exhaust rocker arm cam element.

Abstract: Engine compression release brakes include some degree of lash between the brake actuation portion and the engine exhaust valve portion. The disclosed apparatus and method provides an integral lash adjuster that includes an adjusting screw that is threadably received by a slidable plunger. Rotation of the adjusting screw causes the plunger to slide relative to a plunger cavity and responsively modify the amount of lash.

Abstract: An engine (10) having a control system (24) that executes a control strategy (44) for limiting engine fueling upon deactivation of an engine retarder. Upon deactivation of the retarder, the strategy immediately shuts off fueling by setting the maximum fueling limit MFLMX to zero via setting of a latch function (42). Fueling continues to be shut off so long as the difference between a desired pressure for the hydraulic fluid used to force fuel into the engine combustion chambers and actual pressure of the hydraulic fluid (ICP—ERR) equals or exceeds a value (ICP—VRE—ERR) from a map (48) correlated both with the speed (N) at which the engine is running and with governed engine fueling (MFGOV) appropriate for the load on the engine at the engine running speed. Once that difference ceases to equal or exceed a value from the map (48), the latch function is reset, and the limit value for fueling provided by the strategy increases withtime according to a map (54).

Abstract: A control device for a hybrid vehicle having an engine and a motor as driving sources for the vehicle, and when decelerating, the control device stops the fuel supply to the engine and generates energy by regenerative braking. The engine is a cylinder pause-type engine which is capable of switching between the all-cylinder driving state in which all of cylinders are operating, and a cylinder paused driving state in which all of the cylinders are paused, and the control device of the hybrid vehicle comprises a cylinder pause state determination device for determining whether the engine is in the all cylinder driving state or in a cylinder paused driving state and a regeneration amount supplementing device for supplementing the regeneration energy by the motor by use of the increment of the regeneration energy obtained during the cylinder pausing operation than that obtained during all cylinder driving state.

Abstract: A system and method for operating at least an intake and exhaust valve in a cylinder with a piston of an engine in a vehicle are described. In one aspect, the method comprises maintaining at least the exhaust valve in a closed position during a period of net engine torque less than zero. Further, during said period of net engine torque less than zero, operating with at least the intake valve open, then closing the intake valve, and then opening the intake valve.

Abstract: In a control apparatus for controlling an intake air amount of an engine by variably controlling a lift amount of an intake valve, when a variable valve lift mechanism is failed, the control is switched to a control of the intake air amount based on an opening degree of a throttle valve, and also the opening degree of the throttle valve is restricted within an upper limit value in order to ensure a negative pressure utilized by a brake booster.

Abstract: A control system for an internal combustion engine includes a plurality of valve actuators, each of which is operatively connected to at least one of a plurality of combustion chambers of the engine to open and/or hold open at least one valve associated with a combustion chamber. A controller is provided that is adapted to command the use of less than all of the valve actuators in a substantially balanced manner.

Abstract: A variable valve actuation system for providing discrete exhaust and intake valve lift profiles for various operating modes of an internal combustion engine. The variable valve actuation system includes exhaust and intake rocker assemblies, exhaust and intake hydraulic extension devices operatively coupling corresponding rocker assemblies with respective engine valves and exhaust and intake control valves for selectively supplying the pressurized hydraulic fluid to the extension devices so as to independently switch them between a pressurized condition and a depressurized condition. The engine further includes an exhaust brake provided to initiate a small lift of the exhaust valve during the engine braking operation while the exhaust extension device maintains the exhaust valve open during a compression stroke for bleeder-compression release braking. The exhaust and intake valves can be adjusted independently to provide combinations of valve lift modes.

Abstract: A vehicle-mounted internal combustion engine has a variable lift mechanism for varying the valve lift of an intake valve. During deceleration of the vehicle, an ECU performs fuel cutoff control for temporarily stopping supply of fuel to the engine. During the fuel cutoff control, the ECU performs throttle opening increase control as necessary to set the opening degree of a throttle valve greater than a usual target opening degree that is set when an acceleration pedal is not depressed. If the throttle opening increase control is being performed when resumption of the fuel supply is required during the fuel cutoff control, the ECU controls the variable lift mechanism such that the valve lift is reduced compared to a situation where the throttle opening increase control is not being performed.

Abstract: A compression release brake system 10 includes a hydraulic apparatus 12 for controllably opening at least one exhaust valve 14 of at least one cylinder 16 of an engine in response to motion of a cam actuator 12. The system 10 includes a master piston assembly 40 having a master piston 42 engageable with the cam actuator 12. The master piston 42 includes a compressible piston pin 56. A slave piston assembly 44 is hydraulically linked to the master piston assembly 40 and includes a slave piston 46 engageable with the at least one exhaust valve 14.

Abstract: Lost motion systems and methods for providing engine valves with variable valve actuation for engine valve events are disclosed. The system may include a master piston hydraulically linked to a slave piston, and a dedicated cam operatively connected to the master piston. The slave piston may be disposed substantially perpendicular to the master piston in a common housing. The slave piston is adapted to actuate one or more engine valves. The slave piston may incorporate an optional valve seating assembly into its upper end. A trigger valve may be operatively connected to the master-slave hydraulic circuit to selectively release and add hydraulic fluid to the circuit.

Abstract: A method of controlling an internal combustion engine when the engine is operating in an engine braking mode is provided. The engine operates in the engine braking mode and an exhaust valve for the cylinder is prematurely opened to dissipate power. The method includes controlling airflow to at least one cylinder based on a comparison of a desired mass airflow rate and an actual mass airflow rate such that the actual mass airflow rate tracks the desired mass airflow rate.

Abstract: A gas recirculation system is disclosed for improving engine braking in an internal combustion engine having an intake valve, an exhaust valve, and a cylinder. The system includes an exhaust manifold operatively connected to the cylinder through the exhaust valve; an intake manifold operatively connected to the cylinder through the intake valve; and a gas recirculation passage adapted to recirculate gas from the exhaust manifold to the intake manifold during an engine braking event.

Abstract: The present invention is directed to an engine braking assembly and method for producing a bleeder braking event in an engine having at least one engine valve, at least one engine cylinder, and intake and exhaust manifolds. The engine braking assembly comprises an engine housing, having a hydraulic circuit formed therein; a high-pressure fluid source adapted to store high-pressure fluid therein; a valve for controlling the flow of the high-pressure fluid, in communication with the high-pressure fluid source through the hydraulic circuit; a control device for selectively controlling the valve; and a valve actuation assembly in communication with the valve through the hydraulic circuit, wherein the valve actuation assembly receives the high-pressure fluid through the valve and wherein the hydraulic force created by the high-pressure fluid actuates and holds open the at least one engine valve to produce the bleeder braking event.

Abstract: The present invention relates to engines having multiple hydraulic devices. For instance, in a typical multi-cylinder diesel engine, each cylinder includes an intake valve, an exhaust valve, a fuel injector and an engine brake. It is common for each of these devices to be controlled by an individual actuator. However, engineers have learned that decreasing the number of engine components can increase engine robustness. Therefore, the present invention utilizes a single rotary actuator to control multiple hydraulic devices for an engine cylinder.

Abstract: Valve mechanism in an internal combustion engine, includes a valve play-take up mechanism in the form of a piston in a cylinder chamber at one end of an exhaust rocker arm, and a hydraulic circuit with valve elements for supplying or draining off pressure fluid to and from the cylinder chamber. A second cylinder chamber with a piston acting in an opposite direction is arranged in the rocker arm and communicates with the first-mentioned cylinder chamber. A brake rocker arm is mounted on the same rocker arm shaft as the exhaust rocker arm and has an outer end, which acts against the piston in the second cylinder chamber. The brake rocker arm has its own cam element with brake cam lobes to one side of the exhaust rocker arm cam element.

Abstract: A supplementary brake for a vehicle adapted for use in a heavy duty vehicle to supplement the capacity of a main brake system for obtaining sufficient braking efficiency. The brake comprises an oil pressure supplying unit, an oil pressure control unit for controlling oil pressure, a pulsatory pressure forming unit for forming a pulsatory pressure to the oil pressure supplied from the oil pressure control unit to the profile of an engine injection cam, a valve opening and closing unit for opening an closing an exhaust valve of an engine according to the pulsatory pressure formed by the pulsatory pressure forming unit, and a controller for controlling the oil pressure supply unit according to the operating state of the engine.

Abstract: A variable valve actuation system for providing discrete exhaust and intake valve lift profiles for various operating modes of an internal combustion engine. The variable valve actuation system includes exhaust and intake rocker assemblies, exhaust and intake hydraulic extension devices operatively coupling corresponding rocker assemblies with respective engine valves and exhaust and intake control valves for selectively supplying the pressurized hydraulic fluid to the extension devices so as to independently switch them between a pressurized condition and a depressurized condition. The engine further includes an exhaust brake provided to initiate a small lift of the exhaust valve during the engine braking operation while the exhaust extension device maintains the exhaust valve open during a compression stroke for bleeder-compression release braking. The exhaust and intake valves can be adjusted independently to provide combinations of valve lift modes.

Abstract: An engine with a lockable valve actuator and method of controlling an engine with such an actuator are disclosed. The actuator may include an actuator cylinder with an actuator piston reciprocatingly disposed therein. The actuator piston may be moved by directing pressurized fluid into the actuator cylinder, and locked into a given position by maintaining the pressurized fluid in the actuator cylinder. The actuator may be used in conjunction with a mechanically driven actuator used to move a valve, with the fluidically driven actuator being used to maintain the valve into a desired position.

Abstract: A system for accomplishing engine exhaust braking and exhaust gas recirculation for an engine having an exhaust manifold and a plurality of exhaust valves per cylinder during a four stroke engine cycle is provided. The system includes an actuation device operable to provide valve actuation of a single exhaust valve for an exhaust braking event and an exhaust gas recirculation event. The exhaust valve is not completely closed during the exhaust braking event and the exhaust gas recirculation event. The exhaust braking event includes actuating a single exhaust valve beginning during a second half of a compression stroke and a first half of an expansion stroke, and closing the exhaust valve beginning during a second half of an exhaust stroke. The exhaust gas recirculation event includes reactuating the exhaust valve beginning during a first half of an intake stroke, and closings the exhaust valve beginning during a second half of the intake stroke.

Abstract: An apparatus and method for effectuating multi-cycle engine braking is disclosed. The present invention controls the operation of the engine valves to permit more than one compression release event during a single engine operating cycle. The apparatus includes an assembly for operating at least one exhaust valve of an engine cylinder during a positive power operation. The apparatus further includes an assembly for operating at least one intake valve of the engine cylinder. The apparatus further including an assembly for operating the at least one exhaust valve during an engine braking operation.