Abstract: In the context of an IC engine of the piston type comprising an inlet duct leading to at least one combustion chamber of the engine, at least one inlet valve which is placed between the inlet duct and each combustion chamber and determines the end of inlet of the combustion chamber, and an additional valve placed upstream from the inlet valve, the additional valve is open on opening of the inlet valve, closes shortly thereafter and opens again before the inlet valve closes.

Abstract: In an IC engine of the piston type a control valve (22) is arranged upstream from the engine inlet valve (16) in the inlet duct (14). This control valve is in the form of a directional valve with an adjustable opening threshold and preferably in the form of a check flap (26) closing in a direction opposite to the flow direction, whose release force may be adjusted and which is opened in accordance with the selected operational parameters of the IC engine and with a freely set retardation in relation to the engine inlet valve (16).

Abstract: A control system for the carburetor of an internal combustion engine wherein the carburetor has a choke valve disposed at the inlet of the carburetor induction tube and the choke valve is operated automatically by an actuator. The actuator for the control includes a pulse-width modulator in which the pulse width or the degree of modulation is influenced by a family of characteristics stored in a programmable memory, the memory applying signals to the pulse-width modulator for pre-specified air-fuel mixtures in accordance with engine speed.

Abstract: Throttle valves are individually disposed in a plurality of intake passages of an engine. In normal operation condition of the throttle valves, a first control device controls the throttle valves according to the detection result of an operation condition detecting device to control the amounts of intake air of the individual intake passages, thereby obtaining good engine performance from low-speed to high-speed ranges. When an abnormality detecting device detects an abnormality in a throttle valve, a determination device determines a normal throttle valve, and a second control device controls only the normal throttle valve in preference to the first control device to control the intake air amount, thereby ensuring continued operation even if a malfunction occurs in one of the throttle valves.

Abstract: In a carburetor of a motor vehicle engine having an accelerating pump for supplying additional fuel when an accelerator pedal is depressed to a large extent, the accelerator pedal is connected to a slider which is connected through an accelerating pump cable to a swing arm for actuating the accelerating pump via a link and a lever. The slider is connected also to a throttle lever through a throttle cable. The throttle lever is coupled to a throttle shaft of a throttle valve by means of a torsion spring. When the accelerator pedal is depressed, the throttle cable and the accelerating pump cable are pulled, and the control lever is turned to rotate the throttle shaft by way of the spring in a direction toward an open position of the throttling valve so that the engine is accelerated, while the accelerating fuel pump is operated through the swing arm, the link and the lever so that an increased amount of fuel is supplied by the pump.

Abstract: In the case of an IC engine of the piston type a further valve (22) is placed upstream from the engine inlet valve (16) in the inlet duct (14) and such valve is designed as a directional valve with an adjustable opening threshold, preferably a check flap (26) closing against the direction in inward flow and having an adjustable unsticking force.

Abstract: A movable wall member is mounted in the intake runner of an internal combustion engine manifold and connected to an actuator plate in the manifold plenum which moves the wall member in a longitudinal direction to increase the effective runner length. A rigid link or end panel is pivotally connected to the other end of the wall member and to the associated runner wall so that longitudinal movement of the wall member results in simultaneous transverse movement thereby reducing the effective cross-sectional flow area of the runner passage. The movable wall members of multiple runner passages are connected to a common actuator plate in the manifold plenum which reduces the effective plenum volume upon displacement of the actuator plate.

Abstract: An engine control system is disclosed for reducing the hydrocarbon content in exhaust gas from a crankcase scavenged, two-stroke engine in the operating range near idle, with light operator induced engine loading. As operator demand for engine output power is increased, the control system increases the fuel per cylinder delivered to the engine, while restricting the supplied mass of air per cylinder to a value less than or equal to that flowing at unloaded engine idle.

Abstract: For charging the combustion chambers (10) provided with an inlet (14) and an outlet (16) valve of an IC engine of the piston type there is a charger (20) producing a continuous pressure and pumping into a storage space (28). In a way dependent on the ignition frequency of the associated combustion chambers (10) an air control valve (34) is opened and closed which is arranged between the storage space (28) and an inlet duct (36) leading to the inlet valve (14) of these combustion chambers (10). The phase relationship of the valve (34) to the inlet valve (14) may be changed in a way dependent on the required manner of operation of the engine between a position concentrating the air supply from the storage space (28) on the start of inlet and a position concentrating the supply on the end of inlet to such combustion chambers (10), each duct (40) supplying each combustion with non-compressed charge being shut off on the side of the combustion chamber to be supplied.

Abstract: A clamp assembly for fixedly mounting the lower end of a remote speed control cable that controls the speed of a small internal combustion engine. The clamp assembly includes a casing clamp having a mounting member having a base plate with a first fastener receiving opening formed therethrough and a mounting plate spaced from one side of the base plate and interconnected therewith by a link member, and a clamp plate spaced from the other side of the base plate including a body portion having a second fastener receiving opening formed therethrough disposed in alignment with the first fastener-receiving opening. The clamp plate is movable toward the base plate by a fastener to permit clamping of a cable casing between the clamp plate and the base plate. The mounting plate includes a dimple projecting therefrom for engaging and stopping the fastener at a predetermined location as well as a pair of shoulders for properly locating the casing clamp on an engine mounting bracket.

Abstract: A throttle body defining a passageway and including a throttle valve formed by a pivoting plate is profiled to include a venturi nozzle whose converging wall lies adjacent the path of the plate periphery. The radius, and other characteristics of the converging wall reduces the change of flow rate throughout the low range of throttle travel to reduce sensitivity to throttle actuator position. Furthermore, the venturi nozzle profile is configured in accordance with standard engineering characteristics to avoid pressure differential which restricts air flow rate through the passage and maintains a high maximum flow rate through the throttle passage. Moreover, the profile can be formed by simple mold parts or simple machining apparatus for ease of construction.

Abstract: A control device for a vertical shaft type engine controls the engine by a single manipulation or acceleration control lever from stoppage to choking. The control device includes a first control lever and a second control lever which are relatively rotatable and can rotate jointly within a predetermined range. The first control lever is connected to a governor spring and is rotatable between an engine stop switch terminal and a highest speed rotation regulating screw. The second control lever is provided with a connecting section for connection to a Bowden wire which is in turn connected to the manipulation or acceleration control lever on a working machine, a pair of engaging sections for engaging with the first control lever and phase-shifted by 180.degree. from each other, and a pair of contact sections for contacting a choke lever and phase-shifted by 180.degree. from each other.

Abstract: An engine/governor friction damper mechanism provides for a method of reducing hunting and searching in a governor controlled engine/generator set. The preferred method comprises a modification in a conventional arrangement utilizing a governor rod and pivotal connection with a crank arm on a throttle control assembly. Friction to pivotal movement of the governor rod with respect to the crank arm is provided by means of a spring-loaded friction washer member arrangement.

Abstract: An internal combustion engine or the like is provided with an induction system having intake runners of conical or equivalent configuration in which flow control cones or elements are axially moved to vary the effective cross-sectional area of the runner passages and thereby control the flow velocity and inertia of the incoming charge to improve various operating parameters such as combustion and charging efficiency.

Abstract: An intake control system includes an intake control valve disposed in a common intake pipe connected to engine cylinders or a plurality of intake control valves disposed in intake pipes connected respectively to the engine cylinders. The intake control valves are openable and closable under the control of an electronic control unit directly or through respective actuators, based on an electric signal indicative of an operating condition of intake valves on engine cylinders.

Abstract: A control device for a throttle valve for use with an internal combustion engine installed in a vehicle. The device has a throttle valve shaft secured to the throttle valve, and a linkage to be driven by a linkage member including an accelerator wire for opening and closing the throttle valve. The linkage is a three-joint linkage mechanism including a throttle lever secured to the throttle valve shaft, a lever-mounting shaft secured to the throttle body, a drive lever rotatably mounted on the lever-mounting shaft, and a rod connecting the throttle lever and the drive lever.

Abstract: An apparatus for controlling the angular displacement of a throttle valve for an automotive vehicle includes a return spring attached to the rotational axis of the throttle valve which biases the rotational axis of the throttle valve towards its fully closed position, and which automatically moves the throttle valve to its fully closed position without excessive wear on the throttle valve or on a throttle chamber.

Abstract: An apparatus responsive to a change in the position of an accelerator pedal for controlling movement of a throttle valve situated within an induction passage. The apparatus includes a control circuit which determines new and minimum values for the position of the accelerator pedal and determines a demand value corresponding to a setting of the position of the throttle valve as a function of the difference between the new and minimum values. The control circuit substitutes the new value for the minimum value when the accelerator pedal remains released and placed at the same position for a predetermined time.

Abstract: An adjustable throttle linkage for use in an outboard motor having a pivotable throttle valve, and a throttle lever for controlling the position of the throttle valve. The adjustable throttle linkage comprises a connecting link having opposite ends, one end being connected to the throttle lever. The other end of the connecting link is adjustably connected to a control member in turn connected to the throttle valve. The apparatus for adjustably connecting includes a yoke connected to the control member, and the yoke includes a body having a first portion including a central bore adapted to house the threaded portion of the connecting link. The yoke includes a slot including opposed surfaces and housing a thumb wheel, the thumb wheel being threaded onto the threaded portion of the connecting link such that threaded movement of the thumb wheel on the connecting link causes movement of the yoke with respect to the connecting link.

Abstract: In a throttle system including electrical elements or devices, if trouble occurs in these elements, there exists a problem in that the throttle valve is further driven forcibly in spite of the fact that the throttle valve has already been fully closed or opened or the throttle valve is kept open in spite of the fact that the accelerator pedal has already been fully released. To overcome the above problem, the actual throttle valve opening rate is corrected on the basis of the throttle valve fully-closed and fully-opened opening rates and in accordance with a proportion calculation.

Abstract: An air suction device for a diesel engine having a throttle valve disposed within an air suction passage wherein the throttle valve has an opening through which air may pass even when the throttle valve is in a closed position and wherein a mechanism is positioned adjacent that hole to selectively control the amount of air passing through that hole when the throttle valve is in a closed position.

Abstract: A dual induction type intake system for an internal combustion engine has a primary intake passageway for light load operation of the engine and a secondary intake passageway for heavy load operation of the engine. The downstream side open end of each intake passageway opens toward the intake port of the cylinder of the engine. The secondary intake passageway is provided with a controllable valve therein. The load on the engine is detected and the controllable valve is opened when the load on the engine is heavier than a predetermined value so that the intake gas is introduced into the combustion chamber through both the primary and secondary intake passageways, while otherwise the controllable valve is closed so that the intake gas is introduced into the combustion chamber only through the primary intake passageway.

Abstract: In an accelerator control system including electrical elements or devices, if trouble occurs in these elements, the throttle valve may be kept open in spite of the fact that the accelerator pedal is fully released. To overcome the above problem, an accelerator pedal zero-stroke detector, a throttle valve initial-position detector and an abnormality signal generator are additionally provided for the accelerator control system, in order to generate an alarm signal or a system disabling signal when the throttle valve is kept open beyond a predetermined time interval after the accelerator pedal has been fully released.

Abstract: An engine throttle valve operating device comprising a throttle valve operating foot pedal position detector for detecting the position of the foot pedal and producing a foot pedal position signal corresponding to the position of the foot pedal, a rapid acceleration detector connected with the foot pedal position detection for receiving the foot pedal position signal therefrom and producing a rate signal corresponding to a rate of change per unit time of the position of the foot pedal, a throttle valve actuator for actuating the engine throttle valve, a throttle valve driving signal generating circuit responsive to the foot pedal position signal and the rate signal to produce a first drive signal for operating the actuator in accordance with the foot pedal position signal when the rate of change per unit time of the position of the foot pedal is smaller than a predetermined value and a second drive signal for operating the actuator by a greater extent than under the first drive signal when the rate of change

Abstract: Two embodiments of ignition timing mechanism wherein a timing curve is generated in response to the position of the throttle valve. In each embodiment the timing is advanced on progressive opening of the throttle valve until a predetermined maximum advance is obtained at a position less than wide-open throttle. The timing is then retarded from the maximum advanced position as the throttle valve is continued to open to its wide-open throttle position. In each embodiment the timing is retarded beyond the maximum advanced position to a predetermined advanced position prior to fully wide-open throttle position and this advance is held during the remainder of opening of the throttle valve.

Abstract: A method for intake throttling for a diesel engine provided with an exhaust gas soot catcher, which also has an intake throttle valve for restricting intake air, thus heating the exhaust gases for purging the soot catcher. When the soot catcher is clogged with soot, throttling operation of the intake throttling valve is commenced after a first time period has elapsed after the point which represents the current operational condition of the diesel engine in a phase space whose dimensions are certain operating parameters of the diesel engine has transited from a first region representing non intake throttling combinations of these certain operating parameters to a second region, the complement of the first region, representing intake throttling combinations of these operating parameters; and/or such throttling operation of the intake throttling valve is ceased after a second time period has elapsed after this point has transited to this first region from this second region.

Abstract: A diesel engine is provided with an air throttle valve fitted in its intake system, which when operated to provide throttling action decreases the air flow in the intake system of the engine and increases the temperature of the exhaust gases of the engine, in order to heat up a soot particle catcher fitted to the exhaust system which thus is purged by combusting the accumulation of soot particles in it. When the air throttle valve is thus throttling the intake system and thus raising the temperature of the exhaust gases so as to purge the soot particle catcher, the amount of throttling provided by the air throttle valve is controlled, by comparing the pressure in the intake system downstream of the air throttle valve with a certain reference pressure, so as to keep this pressure in the intake system downstream of the air throttle valve substantially the same as this reference pressure.

Abstract: An intake air throttling system for a diesel engine comprising an air intake passage. The system includes a throttling valve mounted in the air intake passage so as to selectively throttle air flow through it. This throttling valve can be positioned to at least a first position in which it substantially fully closes the air intake passage, a second position in which it partly throttles the air intake passage to a substantial extent but does not fully close it, and a third position in which it does not throttle the air intake passage to any substantial extent. The throttling valve is controlled by a control system, which positions it to the first position when the engine is being stopped, which positions it to the second position when the engine is being idled, and which positions it to the third position when the engine is being operated in non idling load bearing operational condition.

Abstract: A suction air throttling device of a diesel engine in which a throttle valve is opened or shut along with the accelerator operation, wherein there is arranged a link connected with an accelerator pedal and opening or shutting the throttle valve in accordance with depression of the accelerator pedal, the rotating axis of the link being positioned eccentrically from the rotation center of the throttle valve shaft, so that the opening degree of the throttle valve is larger in the small opening degree zone of the link and the opening degree of the throttle valve is smaller in the large opening degree zone of the link, whereby the characteristic curve between the opening degrees of the throttle valve and the accelerator is a convex line.

Abstract: An intake air throttle device, of a diesel engine, with a throttle valve disposed in an intake air passage. The throttle valve is moved into a full-open, an intermediate, and a full-closed position according to the engine operation.An actuator for the throttle valve is vacuum-operated. A temperature sensitive valve is disposed in a conduit connecting the actuator to the vacuum source, thereby the throttle valve is brought into the full-open position when the engine is cool for preventing white smoke in exhaust gas.

Abstract: An air intake system for a supercharged automobile engine comprises a supercharger disposed on an air intake passage, a primary throttle valve disposed in a primary passage downstream of the supercharger and operatively coupled to an accelerator pedal, a secondary throttle valve disposed in a secondary passage and adapted to be controlled in association with the primary throttle valve, an auxiliary throttle valve in the secondary passage upstream of the secondary throttle valve, and an actuator operable to maintain the secondary throttle valve in a full open position when and so long as the load on the engine is equal to or larger than a predetermined medium load and to gradually open the secondary throttle valve with increase of the suction pressure when and so long as the load on the engine is smaller than the predetermined medium load.

Abstract: A control linkage is provided between an actuating crank and the throttle butterfly valve of an internal combustion engine. The control linkage is a second degree hesitation mechanism, such as an epicyclic gear train, for example having a gear ratio of 4:1 and an eccentricity ratio of between 0.7 and 0.8. The control linkage results in a more linear relationship between engine output and the rotational movement of the actuating crank.

Abstract: An automatic speed control for a heavy duty vehicle includes a controller which regulates communication between a compressed air source and an air actuated throttle mechanism. The controller generates a control signal which is a function of a speed error signal and the position of the air actuated throttle to regulate the compressed air source. The speed error signal is calculated as the difference between a commanded speed signal and an actual speed signal. To generate the control signal, the error signal and throttle position signal are operated on by different lead-lag transfer functions. These lead-lag terms are thereafter combined with a proportional speed error term to yield the desired control signal. The system further includes a throttle control feature for powering auxiliary equipment when the actual speed signal is zero. Another feature of the control limits the commanded speed signal to a set value when it exceeds a predetermined limit.

Abstract: A differential throttle linkage control for controlling the flow of fuel to an engine receives a main input from the throttle lever, and a second input from a trim actuator motor through a movable portion of a programmed split cam. The throttle control algebraically sums the inputs to produce a single output operably connected to the fuel metering device of the engine. The programmed split cam modifies or neutralizes the effects of the trim input through selected ranges of the throttle lever input stroke.

Abstract: An intake throttling device adapted to a Diesel engine includes an intake pipe for connection to an intake manifold of the engine, a throttle valve arranged within the intake pipe, and an actuator operatively connected to the throttle valve and arranged to be deactivated to fully open the throttle valve during normal operation of the engine, to be rendered in its first activated condition to adjust the opening angle of the throttle valve during idling operation of the engine, and to be rendered in its second activated condition to fully close the throttle valve when the engine is arrested or immediately before the engine is arrested.

Abstract: A throttle valve has or cooperates with a metering wall or walls which function to limit the amount of air permitted to flow past the edge of the throttle valve when it is initially moved from its closed position. The amount of rotation of the throttle valve for a given change of air flow is thus increased enabling the output of a sensor such as a variable resistor to vary sufficiently to enable an accurate indication of the amount of air passing to the engine especially at frequently used relatively low throttle settings.

Abstract: In an internal combustion engine with a carburetor control device, a throttle valve of the carburetor is arranged in the intake port which is defined by the cylinder block of the engine and a control linkage is established between the crankshaft and the throttle valve in order to control the speed of the throttle valve in accordance with a set value. The connection linkage is arranged in the interior of the crankcase and extends completely within the cylinder block and the crankcase interior.

Abstract: A device for feed control of valve-controlled internal combustion engines, with the combustion chamber capable of being closed off by an intake valve toward the intake passage, and with a further shutoff element being provided in the intake passage. This further shutoff element is a slotted flat slide valve which is movable in an oscillating manner and cooperates with counter slots. The counter slots are formed by vanes arranged in the housing. The flat slide valve is drivable by a cam.

Abstract: An apparatus for regulating the quantity of air-fuel mixture supplied to each of the cylinders of an internal combustion engine and for selectively obstructing the flow of the air-fuel mixture to one or more such cylinders to effectively disable those cylinders. A butterfly valve is provided for each cylinder of the engine and is positioned in the passage in the intake assembly which supplies the air-fuel mixture to that cylinder at a location adjacent the end of the passage which is remote from the carburetor. The valves are controlled individually or in groups by a manually operated control mechanism. In one embodiment, the intake assembly includes a valve plate which is positioned between the engine block assembly and the intake manifold, with a portion of each branch passage being defined by a respective opening through the valve plate and each butterfly valve being provided in a respective one of such openings in the valve plate.

Abstract: The two-cycle internal combustion engine includes an engine block having a cylindrical wall defining a cylinder having a head end, a piston mounted for reciprocative movement in the cylinder, and a passage in the engine block, such as an exhaust passage, a transfer passage, or a crankcase fuel intake passage, terminating at the cylinder wall in a port, such as an exhaust port, a transfer port or a piston-controlled, crankcase fuel intake port, having upper and lower edges. A valve mounted in the passage for movement relative to the port is operable to selectively vary the effective distance of one of the port edges from the cylinder head end and thereby provide the capability of varying the timing of the port opening and/or closing as required to obtain optimum engine performance at different operating conditions.

Abstract: A four-stroke cycle spark ignition internal combustion engine having an individual throttle valve for each combustion chamber closely upstream of intake valve port thereto for reducing the pumping loss and cooperating with divided intake passages of different flow areas downstream of the throttle valve to increase and maintain the velocity of the air-fuel mixture into the combustion chamber at small throttle openings.

Abstract: Disclosed herein is a lawn mower including a blade housing, wheels for supporting the blade housing for movement along the ground, a rotary blade supported in the blade housing, and an internal combustion engine supported by the blade housing and rotatably driving the blade. The internal combustion engine includes a carburetor, a movable throttle control for controlling fluid flow through the carburetor, the throttle control being movable from an open position to a flow restricting position, a movable air vane connected to the throttle control for moving the throttle control, and a fan for forcing air against the air vane and for urging the throttle control to the flow restricting position.

Abstract: A gasoline internal combustion engine is operated at all times with a full charge of air and is thus unthrottled. At low power levels for such an engine, the ratio of gasoline to air is too lean for normal combustion; therefore, special arrangements are provided by this invention for ensuring combustion.