Abstract: The invention pertains to a valve drive arrangement for an internal combustion engine comprising cylinders each having an intake valve and an intake channel leading to the intake valve. The intake channel is divided into two partial channels near the cylinder. One of the partial channels may also be made switchable by including a switchable flow blocking device. A rocker arm acts on the valve and a push rod is arranged between an in-block camshaft and the rocker arm. The push rod activating the rocker arm for the intake valve is guided by a passage between the two partial channels of the intake channel. In this way, despite the restricted space in the cylinder head, both partial channels are designed relatively wide and well adapted to the flow required.

Abstract: An engine having an air intake passage for drawing air into a combustion chamber and an injecting device for injecting fuel into the combustion chamber. A mixture of air and fuel undergoes stratified charge combustion. Sensors detect the operating conditions of the engine, and a swirl control valve opens and closes the air intake passage to swirl the air-fuel mixture. An actuator drives the swirl control valve. A computer computes a target opening angle of the swirl control valve in response to the detected operating conditions. A controller controls the force of the swirl by controlling the actuator in accordance with the computed target opening angle. A detector detects fluctuation of engine rotation. A corrector corrects the target opening angle in response to the detected fluctuation of the engine rotation to improve the performance of the engine.

Abstract: A cylinder direct injection spark-ignition engine comprises a cylinder block having cylinders. A cylinder head is fixedly mounted on a block deck of the cylinder block and has first and second intake ports for each cylinder. A fuel injector valve directly injects fuel into a combustion chamber corresponding to each cylinder. A spark plug has a tip end section projecting into the combustion chamber. A piston defines the combustion chamber between it and the cylinder head. The piston has, at its piston crown, a generally circular cavity having a center axis offset from a center axis of the piston toward the intake valves. A swirl control valve controls air flow in the first intake port in accordance with an engine operating condition.

Abstract: A cylinder direct injection spark-ignition engine in which fuel is directly injected from a fuel injector into each cylinder. The engine has an intake system having two intake ports for each cylinder. A swirl control valve is movably disposed in a passage connected to one of the intake ports. The swirl control valve functions to regulate the intensity (a swirl ratio) of swirl to be generated in the cylinder. Sensors are provided to detect an engine operating condition representative of a stratified charge combustion region. Additionally, a controller is provided to control the swirl control valve so as to change the swirl ratio in accordance an engine speed of the engine, when the current engine operating condition is detected to correspond to the stratified charge combustion region.

Abstract: An intake system construction for an internal combustion engine includes a combustion chamber formed with upper and lower extremities thereof defined by a lower wall of a cylinder head and a top wall of a piston, an intake open end formed in the lower wall in opposition to the combustion chamber on one side of a reference plane which contains a central axis of the cylinder, an intake port formed in communication with the combustion chamber via the intake open end and extending upwardly from the intake open end so that a vertical swirl of inducted air is formed in the combustion chamber, an intake valve having a head portion for opening or closing the intake open end and a stem portion extending from the head portion to an upstream side of the intake port through the cylinder head, and a straightening member arranged in the intake port on a downstream side of the stem portion so that an inducted air flow is straightened on the downstream side of the stem portion.

Abstract: An engine control system for an internal combustion engine of a type having a stratified combustion mode and a homogeneous combustion mode comprises a controller for controlling a swirl flow in the engine with a swirl control valve. The controller effects a changeover of a swirl control mode of the swirl control valve from a weak swirl mode to a strong swirl mode immediately in response to a changeover request signal before an actual changeover of a combustion control mode from the homogeneous combustion mode to the stratified combustion mode. In the case of a changeover from the stratified mode to the homogeneous mode, the controller effects a changeover of the swirl control mode from the strong swirl mode to the weak swirl mode in response to an actual changeover of the combustion control mode, with a delay after the changeover request signal.

Abstract: The object of this invention is that a suction devise for an internal combustion engine is to be compact.The suction devise comprising a casing having an air inlet and a plurality of outlets, a filter in the casing for filtering air from said air inlet, a collection chamber in the casing for receiving air from the filter, at least one throttle valve in the casing for controlling the flow of air from said filter to said collection chamber, and a plurality of suction pipes.According to the present invention, the suction device can be made compact to thereby effectively use an engine room of an automobile.

Abstract: An engine having an air intake passage for drawing air into a combustion chamber and an injecting device for injecting fuel into the combustion chamber. A mixture of air and fuel undergoes stratified charge combustion. Sensors detect the operating conditions of the engine, and a swirl control valve opens and closes the air intake passage to swirl the air-fuel mixture. An actuator drives the swirl control valve. A computer computes a target opening angle of the swirl control valve in response to the detected operating conditions. A controller controls the force of the swirl by controlling the actuator in accordance with the computed target opening angle. A detector detects fluctuation of engine rotation. A corrector corrects the target opening angle in response to the detected fluctuation of the engine rotation to improve the performance of the engine.

Abstract: A reciprocating internal combustion engine has at least one camshaft for actuating intake and exhaust valves and a camshaft drive for rotating the camshaft and for adjusting the rotational timing of the camshaft with respect to the crankshaft. A charge motion control valve and the variable camshaft timing mechanism are both used to selectively impart angular momentum to charge entering the engine's cylinder(s).

Abstract: A reciprocating internal combustion engine has a pilot mask situated about the intake valve seat and extending into the engine cylinder and a variable camshaft timing drive system which positions the camshaft such that the lift of the intake valve and the height of the pilot mask are approximately equal when the piston is moving at the point of its greatest velocity during the intake stroke.

Abstract: An intake and exhaust system for use with lean-burn combustion engines includes a first intake port and a second intake port that transfer a fuel-air mixture to a combustion chamber within a cylinder. At least one exhaust port allows combustion gases to exit the combustion chamber. Preferably, in the intake and exhaust system, a first exhaust port and a second exhaust port are located on diagonally opposite sides of the cylinder. The first intake port preferably transfers a fuel-air mixture to the combustion chamber in a direction opposite of the second intake port. When two exhaust ports are used, it is preferable that the first exhaust port transfers gas outside of the combustion chamber in a direction opposite of the second exhaust port. The location of the input and exhaust ports creates a strong swirl under a range of loads.

Abstract: An intake system for an internal combustion engine is described having an intake port 120 divided by a twisted partition wall 123 into two helical channels 121, 111; 122, 112. The end of the partition wall 123 adjacent the intake valve 113 lies in a plane generally perpendicular to the stem of the intake valve 113 and the part of the partition wall 123 at the other end of the intake port 120 lying in a plane generally parallel to the stem of the intake valve 113.

Abstract: A cylinder direct injection spark-ignition internal combustion engine. The engine comprises a cylinder block having a plurality of cylinders. A cylinder head is fixedly mounted on a block deck of the cylinder block. The cylinder head has an intake port for each cylinder. The intake port has first and second sections which are contiguous with each other. The first section is located downstream of the second section relative to the flow of intake air. The first and second sections have respectively first and second axes. The first and second axes incline relative to a bottom flat surface of the cylinder head respectively to form first and second angles, in which the first angle is smaller than the second angle. A fuel injector valve is provided to directly inject fuel into a combustion chamber formed corresponding to each cylinder. The fuel injector valve is located close to the intake port and disposed closer to a periphery of the combustion chamber than a downstream end of the intake port.

Abstract: An intake system construction according to the present invention for an internal combustion engine is provided with a combustion chamber formed with upper and lower extremities thereof defined by a cylinder head and a piston, an intake open end arranged for being opened or closed by an intake valve, an exhaust open end arranged for being opened or closed by an exhaust valve, an intake port formed extending upwardly from the intake open end so that a vertical swirl of inducted air is formed in the combustion chamber, and an exhaust port for discharging combustion gas from the combustion chamber. The intake port is formed wider in one of halves thereof located adjacent a reference plane, which contains a central axis of a cylinder, than in the other half thereof located remote from the reference plane.

Abstract: In a method of forming a fuel/air mixture in an internal combustion engine with direct fuel injection, wherein a combustion air flow is admitted to each cylinder through at least one intake passage tangentially to the cylinder wall such that a combustion air spin flow about the cylinder axis is formed in the combustion chamber and fuel is injected into the combustion chamber in a fuel beam extending along the cylinder axis, at least one additional fluid stream is added to the combustion air flow in the intake passage at the side of the intake passage opposite the direction of the spin flow in the combustion chamber so as to provide an additional spin impulse to the combustion air in the combustion chamber.

Abstract: An internal-combustion engine includes a cylinder, a piston reciprocating therein, intake and exhaust ports, a fuel injection nozzle opening into the combustion chamber of the cylinder and an ignition device situated in the top wall of the cylinder. The top wall of the cylinder as well as the piston base oriented towards the top wall each has first and second surfaces being inclined to one another and meeting in a ridge, whereby the top wall and the piston base have an essentially V-shaped configuration when viewed in a sectional plane taken along the cylinder axis. The first surface of the top wall faces and is parallel with the first surface of the piston base and the second surface of the top wall faces and is parallel with the second surface of the piston base. A dished depression is provided in the piston base such that the depression interrupts the ridge and extends on either side thereof, whereby the dished depression is bounded by the first and second surfaces of the piston base.

Abstract: A direct injection ignition engine includes a piston with a cavity on a top surface thereof, an injector arranged at a peripheral portion of a combustion chamber to be faced to the combustion chamber for injecting a fuel directly into the combustion chamber, an ignition plug arranged to be projected to the combustion chamber for igniting the fuel introduced into the combustion chamber, an intake passage connected to the combustion chamber for introducing an intake air to the combustion chamber, intake air flow control valve arranged in the intake passage for controlling an intake air flow of an inclined vortex including a tumble component and swirl component produced in the combustion chamber, an actuator for driving the control valve, engine load detecting sensor for detecting an engine load, engine speed detecting sensor for detecting an engine speed, fuel supply controller, based on the output signals from the engine load detecting sensor and the engine speed detecting sensor, for producing control signals

Abstract: To reduce fuel consumption and exhaust emissions in an internal combustion engine a comparatively large quantity of exhaust gas is recirculated and a specific swirling flow is imposed on the exhaust gas as it is introduced into the combustion chamber. For this purpose the exhaust duct has a chamfer formed on only one side in the region of a flow cross-section. The swirling flow of exhaust gas rotating about an axis parallel to the cylinder axis, together with the supply of fresh gas, assures an increased fresh-gas concentration in the region of the spark plug.

Abstract: A five-valve per cylinder internal combustion engine having a lens shaped combustion chamber that promotes a high compression ratio and which also reduces the likelihood of knocking. The engine includes a cylinder head having three intake valves disposed substantially on one side of a plane containing the cylinder bore axis and a pair of exhaust valves supported for reciprocation on the other side of the plane. The intake valves are disposed at acute angles to a plane containing the cylinder bore axis and containing the axis of rotation of the camshaft. The center of these poppet valves is disposed of on a plane also containing the cylinder bore axis and perpendicular to the first plane, while the remaining intake valves are disposed at opposite acute angles to this plane. The poppet valves are actuated by a camshaft journaled in bearing surfaces formed directly in the cylinder head and through tappets that are supported in bores formed integrally in the cylinder head.

Abstract: According to the present invention, each of the cylinders of an engine is provided with a first and a second swirl ports for generating a swirl of intake air in the cylinder. The second swirl port is located at the position downstream of the first swirl port with respect to the direction of swirl generated by the first intake port. The helical air passages of the first and the second intake port have a bottom which opens to the cylinder and an upper wall facing the bottom and an end wall defining the end of the helical air passage. The angle .theta..sub.1 between the upper wall and the end wall of the helical air passage of the first (upstream) intake port is formed smaller than the same (the angle .theta..sub.2) of the helical air passage of the second (downstream) intake port. By forming the angle .theta..sub.1 small, intake air flowing through the first intake port rotates a large amount before it flows into the cylinder and a strong swirl is formed by the intake air from the first intake port.

Abstract: A number of embodiments of induction systems for multiple valve internal combustion engines wherein the performance of the engine is improved throughout the engine speed and load ranges by providing variable effective areas for the induction passages. The embodiments disclosed all relate to three intake valve engines and show a number of different variations in intake passages. In all embodiments an EGR system is employed for improving exhaust emission control.

Abstract: An internal combustion engine has two intake valves for each cylinder which can be uncoupled from the respective tappets by drawing fluid under pressure out of a chamber interposed between each tappet and the respective valve. To each engine cylinder there are associated two intake valves, one of which is actuated only at high speed and high loads of the engine. The engine is deprived of the conventional throttle valve. The two intake conduits associated with each cylinder have different specific shapes.

Abstract: A number of embodiments of twin overhead cam shaft reciprocating machines having a plurality of poppet valves. A variable valve timing mechanism is interposed between the cam shafts and respective of the poppet valves for varying their lift and for changing the number of effective poppet valves per cylinder. The lift changing mechanism includes means for shifting at least one rocker arm follower and provides a relatively compact yet highly efficient structure for achieving this purpose.

Abstract: An intake system construction according to the present invention for an internal combustion engine is provided with a combustion chamber formed with upper and lower extremities thereof defined by a cylinder head and a piston, an intake open end arranged for being opened or closed by an intake valve, an exhaust open end arranged for being opened or closed by an exhaust valve, an intake port formed extending upwardly from the intake open end so that a vertical swirl of inducted air is formed in the combustion chamber, and an exhaust port for discharging combustion gas from the combustion chamber. The intake port is formed wider in one of halves thereof located adjacent a reference plane, which contains a central axis of a cylinder, than in the other half thereof located remote from the reference plane.

Abstract: An air-fuel mixture supply apparatus includes an intake passage opening to a combustion chamber in a cylinder, an intake valve provided between the intake passage and the combustion chamber, a fuel injection valve for injecting at least one of branched spray flows directing to the intake valve, a swirl generator generates vortex flow in the mixture in the combustion chamber by controlling to choke the intake passage.

Abstract: A number of embodiments of multi-valve internal combustion engines having a manifold fuel injection and a control valve which changes the air flow pattern into the combustion chamber between an unrestricted flow and a restricted flow wherein turbulence is generated. An air assist arrangement including a number of different embodiments of insert pieces are employed for changing the spray pattern in response to the position of the control valve so as to provide the desired fuel flow into the combustion chamber when the control valve is controlling the air flow.

Abstract: An induction system for a multi-valve internal combustion engine including a control valve arrangement for redirecting the flow into the combustion chamber through a relatively small displaced bypass passageway under certain running conditions so as to provide a high velocity flow into the combustion chamber even though the total air flow is small. The flow is also directed so as to generate a slant-type tumble motion in the combustion chamber to further increase the turbulence and improve combustion under the running conditions when the control valve is in its flow restricting flow redirecting position. The bypass passage has a relatively regular configuration with a low peripheral length to cross-sectional area ratio so as to provide a compact overall assembly and to facilitate manufacturing. In the open position, the control valve offers substantially no restriction to air flow so that high power outputs can be achieved while still maintaining good running under low-speed, low-load conditions.

Abstract: A throttle for an internal combustion engine wherein intake runners (18) include slots (24) through which a slide throttle plate (26) is mounted. The throttle plate includes openings (28) selectively aligned with the runners (18) by an actuator (32) to control the air flow into the engine intake ports (14). Actuation back and forth across the runners (18) can provide for flow control as well as port deactivation, while a throttle plate (226) configured for up and down motion relative to the intake runners (218) can provide for tumble port flow control.

Abstract: Two embodiments of multiple-valve engines wherein both the spark plug and fuel injector are mounted in the cylinder head in side-by-side relationship with their axes lying in a common plane. The spark plug and fuel injector axes extend into the combustion chamber recess in an area that is circumscribed by a circle passing through the centers of the valve seats.

Abstract: A reciprocating piston internal combustion engine has at least one cylinder with a spark plug and at least one piston reciprocating within the at least one cylinder. At least one first intake duct having a mouth connected to the cylinder and a valve seat located at the mouth is provided. At least one first intake valve resting at the valve seat in a closing position of the intake valve is provided. A control device controls the lift action of the first intake valve. The first intake valve is designed such that, in flow direction of the fuel into the cylinder, for short lifts of the first intake valve a flow cross-section of the first intake duct into the cylinder at the mouth is throttled in a throttle area extending at least over an angular distance about a central axis of the first intake valve such that for small valve lifts a directed inflow with increased velocity results.

Abstract: A number of embodiments of induction systems for three-intake-valve-per-cylinder internal combustion engines, wherein the intake valves and the flow passages serving them are disposed so as to generate a tumble motion in the inducted intake charge. A number of embodiments of control valves are provided for redirecting the flow and increasing the tumble action under low-speed, low-load conditions. The control valve in each embodiment is journaled in the cylinder head at a position outwardly of the fasteners which secure the cylinder head to the cylinder block, but still quite close to the valve seats so as to provide maximum turbulence generation.

Abstract: A control method is described for an engine having a throttle body coupled to the engine intake manifold and a bypass air passageway coupled to the throttle body via an electronically controllable bypass valve. A single measurement of air inducted through both the throttle body and the bypass air passageway is provided by an air flow meter. Fuel is delivered to the intake manifold in relation to the single air measurement. An air flow correction value is generated from a functional relationship between engine torque and air/fuel ratio during lean air/fuel operating conditions. Air flow through the bypass passageway is increased by the air flow correction value to compensate for engine torque loss resulting from such lean operation.

Abstract: An internal combustion engine includes an engine cylinder; a first intake port leading to the cylinder for introducing combustion gases thereinto; a first intake valve situated at the cylinder in the first intake port; a second intake port leading to the cylinder for introducing combustion gases thereinto; a second intake valve situated at the cylinder in the second intake port; and a throttle arrangement situated in the second intake port for varying a flow passage cross section thereof. The throttle arrangement includes a flat sliding member movable in a direction of motion thereof perpendicularly to the longitudinal axis of the second intake port for varying the flow passage cross section thereof.

Abstract: An intake system is described for a spark ignition internal combustion engine having ports per cylinder, which may lead to a common intake valve or two separate intake valves. One of the intake ports (12) is shaped to direct a first flow tangentially near the outer periphery of the cylinder and the other intake port (20) is shaped to direct a second, swirling, flow towards the center of the cylinder. The second swirling flow has the same direction of rotation as that of the first flow. Injectors (28) are provided for introducing fuel into the second swirling flow thereby producing within the cylinder a charge that is radially stratified with a combustible mixture concentrated near the center of the cylinder.

Abstract: A four-stroke internal combustion engine with a gabled combustion chamber d at least two intake valves and at least two intake conduits per cylinder, of which a first intake conduit is embodied as unthrottled and a second intake conduit has a throttle device. To attain a stable radial mixture layering, it is provided that the fuel injection valve is disposed in the second intake conduit, and the throttle device in the closed state produces a defined minimum flow rate of between about 5% and about 20%, preferably about 10%, of the maximum flow rate, and that viewed in the direction of the crankshaft axis the center line of the first intake conduit in the intake valve region has a greater radius of curvature than does the center line of the second intake conduit.

Abstract: An internal combustion engine includes a cylinder head having a pair of upright intake ports formed therein on opposite sides of a plug hole extending along a cylinder axis, and each intake port has an upstream-side upright part extending from the top face of the cylinder head along the cylinder axis and a downstream-side slanting part having an intake opening communicating with a combustion chamber on one side of an imaginary plane containing the cylinder axis. An upper opening of each intake port opening in the top face of the cylinder head has a peripheral edge extending along the peripheral edge of an upper opening of the plug hole, and the peripheral edge of the upstream-side upright part extends along the outer surface of a lash adjuster.

Abstract: In a cylinder head of an internal combustion engine with first and second inlet valve ports per cylinder which are controlled by first and second inlet valves, respectively, with different valve lift dependent swirl levels, the first inlet port which is designed to generate a high swirl level with a relatively small valve lift has a smaller valve lift than the second inlet port which is designed to provide a relatively high swirl level with a high valve lift.

Abstract: A multi-valve manifold injected internal combustion engine. The fuel injector has a spray pattern that is directed primarily toward each of the intake valve seats. An air control system is incorporated, however, that directs the airflow primarily toward the center intake valve seat under some running conditions so as to improve fuel stratification.

Abstract: A control valve arrangement for a three-valve-per-cylinder internal combustion engine that redirects the flow through a siamese-type intake passage when in its closed position so as to generate a higher velocity to the intake charge and redirect the flow so as to generate turbulence in the combustion chamber. A number of embodiments of control valves are disclosed, each being of the plate-type and being mounted in a generally oval intake passage on a control valve shaft in such a way that the control valve shaft provides minimum obstruction to the flow through the intake passage, regardless of its position.

Abstract: A throttle for an internal combustion engine wherein intake runners (18) include slots (24) through which a slide throttle plate (26) is mounted. The throttle plate includes openings (28) selectively aligned with the runners (18) by an actuator (32) to control the air flow into the engine intake ports (14). Actuation linearly across the runners (18) provides for tumble port flow control and idle control, as well as port deactivation.

Abstract: According to the present invention, each of the cylinders of an engine is provided with a swirl port, which generates a swirl in the cylinder, and a conventional straight port. A swirl control valve is disposed in an inlet air passage connected to the straight port for blocking the flow of inlet air through the straight port. A fuel injection port is disposed in each of the swirl port and the straight port. The fuel injection port in the straight port is disposed at the position adjacent to the upper edge of the valve seat of the straight port inlet valve. When the swirl control valve blocks the inlet air passage leading to the straight port, fuel is injected from the fuel injection port of the straight port in the latter half of the intake stroke of the piston.

Abstract: A direct injection diesel engine includes a cylinder head which is formed, for each cylinder, with a plurality of intake ports. At least one of the intake ports has an approximately straight throat extending tangentially to the cylinder and opening into a combustion chamber at upper reaches of swirling. Another of the intake ports has a throat opening into the combustion chamber at lower reaches of swirling. A glow plug extends downward from one side of the cylinder head, at which the intake ports open, toward a location between the other intake port. An exhaust port extends from another side of the cylinder head and opens into the combustion chamber.

Abstract: A fuel injection system for an internal combustion engine utilizing manifold injection with the injector positioned downstream of a flow controlling throttle valve. The throttle valve is provided with a flow passage that intersects the spray axis of the injector to provide good fuel vaporization and distribution even at low speeds.

Abstract: An induction system and control arrangement for a three valve per cylinder engine, wherein the induction passages are tuned to provide different effective lengths for different engine running conditions. In addition, a control valve arrangement is provided for controlling the flow to the combustion chambers through the valve seats to generate unrestricted flow under high-speed, high-load conditions and tumble and/or tumble and swirl for promoting turbulence under low-speed, low-load conditions.

Abstract: A control device in an internal combustion engine, interlocking with a device to generate swirls in a combustion chamber of the internal combustion engine by providing bypass passages which allow air to bypass a throttle valve for regulating intake air flow rate of the internal combustion engine to control an output power of the internal combustion engine and allow the air to flow in from the side of atmosphere to communicate with air intake ports for respective cylinders on the downstream side of the throttle valve.

Abstract: A cylinder head and induction passage arrangement for a three intake valve internal combustion engine wherein the center intake passage and its porting arrangement is directed so as to augment the tumble action caused by the side valve seats and their intake passages. The construction also provides that the center intake valve will be disposed so that there will be no shrouded area in the path of flame from the spark plug so as to ensure complete combustion. The cylinder head is made in such a way that the same cylinder head may be used for either bank of an engine having angularly inclined cylinder banks through the machining of only one face thereof.

Abstract: An intake system for a multicylinder internal combustion engine includes a manifold having inlet runners for conducting charge air into the cylinders of an engine, and at least one secondary throttle valve situated within at least one of the inlet runners. An actuator positions the secondary throttle valve, with the actuator being operated by a controller. The controller receives a sensed value from at least one engine operating parameter sensor, determines an appropriate position for the secondary throttle valve and predicts an optimum transition point at which the secondary throttle valve transitions to the appropriate position. The controller then initiates operation of the actuator at a point before the transition point such that the engine smoothly transitions between a first operating condition and a second operating condition.

Abstract: In a valve operating system designed to open and close intake valves of an internal combustion engine by an electromagnetic force, a first electromagnetic driving device for electromagnetically driving a first intake valve capable of opening and closing a first intake valve bore and a second electromagnetic driving device for electromagnetically driving a second intake valve capable of opening and closing a second intake valve bore are controlled by a control device in a manner so that when the engine is in a predetermined operational state, the first intake valve is opened and closed in a condition in which the second intake valve has been closed and stopped. Thus, it is possible to produce a swirl equivalent to that produced by changing of the lift amount, to provide a reduction in consumed electric power and to achieve a reliable engine operation, e.g., starting.

Abstract: Control arrangements for the induction system of an internal combustion engine having a control valve in the induction passage which is moveable between an opened position wherein the flow into the combustion chamber is unrestricted and in a first direction and in closed position wherein the flow into the combustion chamber is restricted to accelerate the velocity of the charge entering the combustion chamber and change its direction from the first direction. Optimum positions are set for the control valve in response to engine speed and engine load but the control valve is held in a closed position when the engine speed is below a predetermined speed and regardless of the load and is also held in an opened position when the engine speed is above a second predetermined speed and regardless of load. Various routines are shown for positioning the control valve to accommodate catalytic convertor warmup, sudden acceleration or deceleration conditions and other transient conditions.

Abstract: An internal combustion engine with charge stratification and tumble motion is provided. A tumble control valve is located in the intake pore upstream of the fuel injector creating a high velocity airflow. Fuel injected by the fuel injector is entrained into the high velocity airflow produced by the tumble control valve thereby establishing an airflow within the cylinder having fuel rich and fuel lean regions. The airflow in the cylinder circulates about an axis substantially perpendicular to the axis of operation of the piston.