Abstract: A throttle apparatus includes a throttle body (12), a throttle valve (13), a throttle shaft (14), an electrically driven motor (15), a drive gear (23), a driven gear (24), a middle gear (25), and a sensor block (19). The middle gear (25) is held by the throttle body (12) such that a gear shaft is displaced from an imaginary straight line (V) connecting together a motor shaft and the throttle shaft (14). A gear arrangement projection part (34) that projects outward by a displacement amount of the middle gear (25) and a connector arrangement projection part (35) that projects to a same side as the gear arrangement projection part (34) at a position adjacent to a motor housing part (12b) side of the gear arrangement projection part (34) are formed on an outer surface of the throttle body (12).

Abstract: Systems and methods are described for controlling an aspirator control valve in an engine. An example method comprises closing the aspirator control valve responsive to diagnosing a first engine degradation condition and opening the aspirator control valve in response to diagnosing a second engine degradation condition.

Abstract: An intake system for an internal combustion engine is provided which comprises a variable valve control apparatus capable of variably and continuously controlling the amount of intake air of an internal combustion engine by varying valve lift characteristics of an intake valve, a collector fluidly connected with a plurality of intake passages for cylinders of the internal combustion engine, and a pressure control mechanism for producing within the collector a vacuum that increases with increase of one of the amount of intake air, engine speed and engine load of the internal combustion engine.

Abstract: A governor for an internal combustion engine having an intake passageway and an engine throttle valve movable between an open position and a closed position, a throttle arm connected to the engine throttle valve to control movement of the engine throttle valve. A pressure assist adjusts the position of the throttle arm when a load is applied to the engine. The pressure assist includes a pressure responsive actuator having a pressure chamber in fluid flow communication with the intake passageway. The pressure responsive actuator is movable in a first direction in response to a pressure or a vacuum in the intake passageway. The throttle arm is movable in response to movement of the pressure responsive actuator. A conduit connects the pressure chamber and the intake passageway in fluid flow communication. A one-way valve is disposed in the conduit between the pressure chamber and the intake passageway.

Abstract: A collector equipped intake system of an internal combustion engine, the collector is fixedly connected directly to either of a cylinder-head side wall and a collector mounting bracket hermetically covering perimeters of intake-port opening end portions of a plurality of intake ports opening through the side wall. A plurality of intake-manifold branches respectively communicating with the plurality of intake ports, are protruded into the interior space of the collector.

Abstract: In a negative pressure actuator which is provided with a negative pressure tank storing an intake negative pressure of an engine, and operated by a negative pressure stored in said negative pressure tank as a power source, an operating possible time of the negative pressure actuator is calculated based on an intake negative pressure, the operation of the negative pressure actuator is permitted when it is within the operating possible time, while the operation of the negative pressure actuator is prohibited when it is over the operating possible time.

Abstract: An induction control system for an internal combustion engine and an operator for controlling the control valve. The system operates so as to move the control valve between an unrestricted flow position and another position wherein the flow velocity or direction is changed. The valve is moved between these positions at varying rates depending upon the engine running condition so as to provide quicker response under some conditions than others.

Abstract: An apparatus for moving a valve flap, especially in the air intake duct of an internal combustion engine, including a vacuum box (20) which executes a longitudinal movement in dependence on the application of a negative pressure or vacuum, and the longitudinal movement of the vacuum box is transmitted via a coupling rod (16) to a traverse rod (15), which in turn is connected to an actuating lever (13) for the valve flap (11). The coupling rod (16) and traverse rod (15) system allows the vacuum box to be arranged in any position relative to the valve flap (11). The apparatus can be simplified further by combining the diaphragm disk (27) with the coupling rod (16) to form a single, integral part. In this case, a force is exerted eccentrically on the vacuum box. The eccentrically exerted force can be compensated by the diaphragm having a shape other than a round contour.

Abstract: The automated integrated input-output control system apparatus. A versatile industrial control apparatus that can be utilized as a modular unit or integrated into industrial machinery or tools to provide an apparatus and method for programmable control of industrial tools, industrial controls and manufacturing operation processes. The automated integrated input-output control system apparatus includes the following components: a control-power mechanism housing, a sensor, input attachment devices, output attachment device, and a control system.

Abstract: A hand lever device is disclosed which allows movable members such as a main lever to be retained appropriately in case members even in a time when a case is dismounted or separated from a handle. In the hand lever device, the case has a ternary structure composed of one side case member (21), an intermediate case member (22) and the other side case member (23). The case (20) is dismounted from the handle (7) by detaching the other case member (23) from the one side case member (21) and the intermediate case member (22). The main lever (30) for drawing a cable (17) connected to a driven member (CV) is retained between the one side case member (21) and the intermediate case member (22) even in a time when said case (20) is dismounted or separated from the handle (7).

Abstract: An adjustable automatic starting line throttle actuation controller for use with a drag racing vehicle. The device controls the throttle from a preset partial throttle opening to a wide open throttle during the initial staging process of the race, while the driver holds the throttle in a wide open position. The device can control the opening of the carburetor linkage of the carburetor to a preset low r.p.m. at the starting line (during the staging process) before a race begins, and control the opening of the throttle for the first portion of the race after the race starts. A preferred version of the device has a dual piston cylinder having respective piston rods connected to the carburetor and one connected to the throttle pedal. An electronic activation assembly controls which piston rod is being actuated.

Abstract: The present invention is directed to a throttle control device to be used in combination with an engine having a throttle and a pump driven by the engine. The automatic control device has a housing defining a chamber having a first opening adapted to receive a fluid containing conduit in communication with the pump. A piston is slideably mounted in the chamber and has a first end acted on by a fluid contained in the conduit. A spring surrounds a portion of the piston within the chamber and biases the piston towards the first opening and, therefore, the fluid. A second end of the piston extends through a second opening in the chamber and controls the throttle. A first adjustable stop in the chamber limits travel of the piston and a second adjustable stop controls the compression of the spring.

Abstract: An air/fuel control apparatus mounted on a racing automobile engine delivers fuel to the engine. A valve therein controls the flow of fuel to the engine, irrespective of the position of the accelerator foot pedal, and the valve is connected to a throttle linkage linking the pedal to the valve. The valve includes a double acting pneumatic cylinder means with a slidable piston therein. A movable shaft extends through both ends of a cylindrical housing, and moves with the piston. One first end of the shaft is coupled to the valve so that slidable movement of the piston opens and closes the valve to increase and decrease, respectively, flow of fuel to the carburetor of the engine. A cable rod connects the housing to the pedal so that movement of the pedal causes the housing to move with respect to the piston therein.

Abstract: An improved throttle control assembly (36) in combination with an electronic controller (48) for controlling shifting in an automated mechanical transmission system (10) having a non-electronically controlled engine (14) is provided. The combination of the throttle control assembly and the control allows the non-electronically controlled engine to be subject to throttle blip as well as throttle dip operations while preventing continuing unsafe conditions as a result of single point failures.

Abstract: The present invention is a hand operated throttle control system for use h a fuel flow control mounted on an internal combustion engine. A hand piece assembly mounted on the vehicle rotated has an actuator so rotation of the hand piece causes a corresponding rotation of the housing. The actuator has a hydraulic structure which uses the rotation of the hand piece to cause a corresponding hydraulic pressure to cause fuel control modification.

Abstract: A throttle valve control system for an automobile having an engine, a carburetor mounted on the engine, a throttle valve in the carburetor for controlling the flow of fuel to the engine, an accelerator pedal, and a throttle linkage interconnected between the accelerator pedal and the throttle valve, the throttle linkage including a throttle linkage adjustment means including a piston/cylinder assembly (11) for expanding and shortening the effective length of the throttle linkage. A throttle limiting closure assembly (16) is mounted onto the piston/cylinder assembly (11) and includes a threaded travel rod (39) and a pair of lock nuts (46) for selectively limiting the amount of expansion of the piston rod from the cylinder. A source of compressed gas is provided including a normally open control valve (19) and an gas flow controller (21).

Abstract: The invention relates to an actuating device for a throttle valve arranged in an intake pipe in a diesel internal combustion engine, having a mechanical adjusting linkage for the load-dependent adjustment of the throttle valve, the adjusting linkage having an idle path. In order to be able to control the throttle valve as a function of a plurality of operating parameters, an actuator actuated by an auxiliary force is proposed via which the throttle valve position predetermined as a function of load can be altered within the idle path.

Abstract: A load-adjustment device for the internal combustion engine of an automotive vehicle has a control lever (1) which, for instance, displaces a throttle valve and is held by a coupling spring (9) against an intermediate lever (5) which can be swung directly by the accelerator pedal (3). A damping device (11) is so developed that, upon a sudden movement of the intermediate lever (5) in the direction of full load, the control lever (1) follows this movement only with a time lag action so that the automative vehicle is not accelerated with excessive jerk.

Abstract: The governor of the invention consists of an output solenoid having a plunger operatively connected to the mechanism to be controlled. The output solenoid is a "bang-bang" type such that full power or no power is delivered to the solenoid even for small errors between the desired operating condition and actual condition of the mechanism to be controlled. The output solenoid is connected in a hydraulic circuit with a control solenoid having a control valve such that the movement of the fluid through this circuit is regulated by the control solenoid. The control solenoid is of the proportional type such that the control valve's position is directly related to the difference between the actual operating condition and the desired operating condition of the mechanism to be controlled.

Abstract: A throttle-valve setting device has, for idle adjustment, a motor setting lever (10) which displaces a throttle valve (3) and is connected via a path-dependent controlling movement-reversal device (15) to a setting member (13) of a setting motor (12). Thereby, upon activation of the setting motor (12), the setting lever (10) first swings slightly in one direction and then in the other direction to the full-load position of the throttle valve (3).

Abstract: A throttle holding device is disclosed that allows an operator to hold open the throttle of the vehicle when the vehicle is not being driven. This increases the amount of available heat to the heating system of the vehicle cab and will allow the vehicle cab to be more quickly and efficiently heated. The throttle hold device of the present invention acts in conjunction with the parking brake and is actuated upon engagement of the parking brake through a pneumatic circuit. Upon actuation a piston is moved against a spring bias and causes the throttle cord of the vehicle to further open the throttle thus raising the idle speed of the vehicle. A shut-off switch is included on the pneumatic circuit to disconnect the system should the operator not desire that the higher idle be obtained. The shut-off switch is particularly useful in the summer months or whenever it is more important to conserve gasoline than to adequately heat the vehicle cab.

Abstract: A load-adjustment device for the internal combustion engine of an automotive vehicle has a control lever (1) which, for instance, displaces a throttle valve and is held by a coupling spring (9) against an intermediate lever (5) which can be swung directly by the accelerator pedal (3). A damping device (11) is so developed that, upon a sudden movement of the intermediate lever (5) in the direction of full load, the control lever (1) follows this movement only with a time lag action so that the automotive vehicle is not accelerated with excessive jerk.

Abstract: A displacement device for a throttle valve of an internal combustion engine in idling condition, has a housing, a diaphragm which is arranged in a chamber in the housing and is operatively connected to the throttle valve, a spring in the chamber, which spring acts with one end against the diaphragm, a vacuum connection to the one chamber, a connection for atmospheric pressure, a coil, and an armature which is axially displaceable in the coil, a valve body being firmly connected to the armature and keeping a connection for atmospheric pressure open or closed corresponding to its instantaneous position. A single connection for atmospheric pressure leads to the chamber and is kept open or closed by the valve body. The connection for vacuum is also kept open or closed by the valve body, the two connections being opened alternately. The valve body is acted on by the spring. The coil current is provided as control variable for the position of the throttle valve.

Abstract: A coupling apparatus for a speed regulator, or governor, of a typed used on motor vehicles for example, comprises a hollow connecting stud which is affixed to a governor positioning drive at a driven end telescoped to a hollow adjustment piece at a driving end. The hollow adjustment piece has a cap with an opening therein. A coupling rod passes through the opening having a driven end enlargement directed toward the governor positioning drive and a connecting apparatus at the other end connected to a speed adjusting apparatus. The coupling rod slides through the cap opening but the driven end enlargement is larger than that portion of the opening through which the coupling rod extends and can, therefore, not slide therein.

Abstract: In a throttle valve actuator, there are provided a first spline gear driven by a motor in a sliding operation, a second spline gear meshed with the first spline gear for rotating a shaft of a throttle valve device, a housing for rotatably supporting the second spline gear. An accelerator pedal is connected via an accelerator wire and the housing to second spline gear so as to rotate the shaft of the throttle valve device. The sliding operation of the first spline gear does not give any force to the accelerator pedal via the houisng and second spline gear.

Abstract: A device for actuating a butterfly throttle valve of an internal combustion engine includes a hydraulic setting member for rotating a shaft of the throttle valve. The hydraulic setting member is driven by a branch flow of fuel delivered by a fuel pump and acting as pressure medium. The branch flow passes through a series of connection of adjustable throttles connected in a hydraulic bridge circuit. The throttles are adjusted by a regulating signal corresponding to the difference between an actual position signal delivered by a position sensor coupled to the throttle valve, and a desired position sensor coupled for example to a gas pedal of the motor vehicle.

Abstract: A device for controlling the engine drive power for automotive vehicles with traction control. A hydraulically actuatable control apparatus (1, 1') is inserted between the drive control pedal (7, 7') and the control member (10, 10') of the vehicle engine. The housing (2, 27) of the control apparatus (1, 1') is stationary and accommodates a piston (3, 30) which is axially slideably by the introduction of auxiliary pressure. The piston is coupled to the drive control pedal (7, 7'), on the one hand, and to the control member (10, 10'), on the other hand. A biased non-return valve (21, 45) which opens by a pedal-side tappet (18, 38) in the event of reduction of the pedal force (F) causes resetting of the control member (10, 10') when the pedal (7, 7') is released. An increase of the pedal force (F) during traction control will not result in a change in the position of the control member.

Abstract: In an installation for the slippage limitation, respectively, prevention of driven wheels of a motor vehicle with an internal combustion engine controllable by an actuatable output adjusting member, an adjustable abutment for the output adjusting member serves for the purpose to so correct the driving torque of the internal combustion engine that the slippage is reduced to the permissive extent.

Abstract: An ajustable throttle connector for a vehicle speed control unit is disclosed. The adjustable throttle connector includes a throttle connector arm which is pivotally connected in an adjustable manner to a housing for the vehicle speed control unit. The adjustable pivotal connection is accomplished by forming a plurality of apertures in the throttle connector arm near the center thereof. A corresponding plurality of apertures are formed in the housing. A pin is inserted through a selected one of the apertures formed in the throttle connector arm and also through the corresponding one of the apertures formed in the housing to provide a fulcrum about which the throttle connector arm is free to pivot.

Abstract: A timer operated throttle closing device for drag racing vehicles. In particular, this throttle closing device automatically senses the initiation of the race and automatically closes the throttle after a predetermined period of time has elapsed, and after a second period of time has elapsed automatically releases the throttle closure device.

Abstract: An acceleration regulator in the driving system of an automotive vehicle comprising an element for transmitting displacement comprising a first portion and a second portion; a differential mechanism having a first input terminal connected to the first portion of the element, a second input terminal, an an output terminal connected to the second portion of the element, and being so arranged that the amount of operation applied through the first portion of the element to the first input terminal is modulated differentially by the piston of the second input terminal so that the modulated amount of operation is taken out at the output terminal; and a fixing mechanism for variably fixing the position of the second input terminal of the differential mechanism, the fixing mechanism being so arranged that when the hydraulic pressure in the hydraulic circuit of the driving system rises to a preset level slightly lower than the relief pressure of the circuit, the second input terminal of the differential mechanism is m

Abstract: A traction slip control device for motor vehicles is disclosed including a sensor responding to a beginning slip of the driving wheels. The sensor operates via a control circuitry, the accelerator pedal-operated throttle valve at the vehicle engine, in a manner for reduction of the engine's driving power. The accelerator pedal is overriden by means of a hydraulic control element connected in. Parallel to the accelerator pedal is a piston rod arranged in a bore within a stepped piston associated with the hydraulic control element. The piston rod is, via a ball lock, adapted to be axially coupled with the stepped piston such that the piston rod is entrained by the stepped piston and shifts the throttle valve in the direction of closure in opposition to the force acting upon the accelerator pedal.

Abstract: A throttle valve is supported rotatably on a pipeline. The throttle valve is driven by a motor. A downstream side of the throttle valve is connected to an engine. A means for opening the throttle valve forcedly is provided so as not to allow a tar component in the fuel for driving the engine to stick on the throttle valve at an outer peripheral portion when the engine is shut down.

Abstract: Compensation for misoperation of the return spring which is coupled to the throttle valve of an internal combustion engine is effected by way of a mechanism which monitors the operation of the engine. Upon detection of a deceleration condition, the mechanism, which may include a mechanical spring-coupled arrangement, an electromagnetic coupling element or a solenoid, operates to engage the throttle valve and rotate the throttle valve to a prescribed opening position slightly ahead of the normal ideal return position.

Abstract: A method of controlling an engine mounted on a construction vehicle comprising the steps of reducing the rotation of the engine to a primary number of revolutions per minute, which is in the vicinity of the rated number of revolutions per minute of the engine under earth moving operation conditions, immediately after all operating levers associated with all of the control valves for turning the vehicle body, for actuating work implements and for running of the vehicle are shifted to their neutral positions, maintaining the engine under such a low speed running condition for a predetermined period of time, and then reducing further the rotation of the engine to a lower, secondary number of revolutions per minute which corresponds to the number of revolutions per minute under idle running conditions thereby achieving reduction in fuel consumption and level of noise generated by the engine.

Abstract: An arrangement in a motor vehicle informing the driver of fuel-economy conditions while driving the vehicle, by creating at the limit at which uneconomic driving commences a pressure point at which further depression of the pedal is resisted. The accelerator pedal is acted upon by a vacuum assembly controlled by a control valve having an auxiliary unit which compares the engine intake pressure with a limit pressure for uneconomic driving and which, when the intake pressure exceeds the limit pressure, switches the control valve to a position in which the vacuum assembly is ventilated to atmosphere, whereupon the assembly is set to an inactive state, and automatically resets the control valve to a normal working position, when the intake pressure lies beneath the limit pressure.

Abstract: Saving fuel in the operation of a motor vehicle by providing an increased resistance to depression of a gas pedal at increased velocities in a predetermined speed range from a lower velocity up to a predetermined upper velocity. A piston is urged against the pedal by a spring in a cylinder. Adjustments in vacuum in the cylinder are utilized to adjust the spring force constituting the resistance to pedal depression of the piston.

Abstract: A fuel injection apparatus in which a closed fuel circuit is pressurized, and the amount of fuel injected is determined by the pressure in the circuit. Air intake by the engine is controlled in response to the amount of fuel injected. The fuel injection apparatus includes a reservoir with a fixed level of fuel, and a high pressure pump pumps fuel from the reservoir and into the fuel circuit. Fixed orifice injection nozzles communicate with the circuit so fuel is varied only by the pressure. Pressure in the circuit is varied by a valve that releases fuel into the reservoir to lower the pressure in the circuit, the valve being controlled by the conventional accelerator pedal. Air to the engine is modulated in response to fuel flow. This is accomplished by varying an air valve in accordance with pressure in the fuel circuit, or by using a constant velocity valve which would vary with engine demand.

Abstract: An installation for damping periodically alternating longitudinal accelerations of a motor vehicle, which are also designated as jerking movements and which occur, above all, in motor vehicles whose internal combustion engines are equipped with electronic fuel injection systems and have a high torque already in the lower rotational speed so that they react very rapidly and sensitively to movements of the gas pedal; the jerking oscillations are thereby damped by the installation of electric and/or hydraulic damping devices into the control system for the fuel-, respectively, mixture-admixing installation.

Abstract: A speed control apparatus is proposed for motor vehicles driven by internal combustion engines and having a hydraulic connecting line between a first hydraulic adjusting cylinder, which is actuatable by the gas pedal, and a second hydraulic adjusting cylinder, which is connected with the throttle valve, the regulating rod of an injection pump in the case of Diesel engines, and the like for adjusting the operating status of the engine. A multiple-position valve is furthermore disposed in the hydraulic connecting line, this valve receiving control commands from an electronic control circuit. The electronic control circuit compares its input signals, provided by transducers, from the first and second hydraulic adjusting cylinders and reacts further such as to provide a supervisory intervention in further regulating control subsystems for the purpose of engine regulation.

Abstract: An accelerator pedal control mechanism provides a positionable stop to resist pedal depression beyond a point at which optimum fuel economy is realized during vehicle acceleration. The position of the stop relative to the accelerator pedal is controlled by an electronic circuit that is programmed to select the desired point of accelerator depression for a given condition of engine operating parameters. A caged limit spring is carried on the underside of the accelerator pedal for engagement with the stop, thus allowing the operator to sense the additional resistance of the spring through the accelerator pedal when the appropriate amount of accelerator depression is reached. The spring allows the operator to override the programmed control by pressing on the accelerator pedal with sufficient force to overcome the limit spring.

Abstract: Apparatus for preventing undesirable reduction in the speed of an engine after starting and including an actuator operable upon engine starting to correct throttle opening to a determined extent in increasing direction, a vacuum power system for the actuator and a switching control circuit for detecting engine starting and predetermined running states of the vehicle and engine to keep the actuator energized as long as the engine speed and the vehicle speed are both below respective preset level. Even after the preset level of vehicle speed has been exceeded, the actuator is also energized in the presence of battery load, such as air conditioning or headlights when the engine speed remains below its preset level. The actuator is de-energized when the vehicle speed exceeds its preset level in the absence of battery load as well as when the preset level of engine speed is exceeded.

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: Apparatus for controlling the idle speed of an internal combustion engine. A contact arm contacts a throttle lever to limit movement of the lever in one direction and to move the lever in the opposite direction so to control the position of a carburetor throttle valve. A vacuum operated unit maintains the contact arm at one position and moves it from one position to another. The vacuum pressure at which the vacuum unit operates is modulated by an electrically operated solenoid to maintain the contact arm in one position when the vacuum pressure is maintained at one level. The contact arm is moved to a new position when the solenoid operates to change the vacuum pressure to a different level.

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: A throttle positioning device for prevent rapid closure of the throttle valve of an internal combustion engine under extreme decel conditions. The throttle control device includes a vacuum motor that is responsive to the pressure in the induction system at a point just slightly upstream of the throttle valve of the engine so that vacuum will be exerted on the vacuum motor when the throttle valve is substantially opened from its idle position and atmospheric pressure will be exerted when the throttle valve is closed toward its idle position. Various arrangements are provided for adjusting the rate of air flow between the vacuum motor and the intake passage in different directions.

Abstract: A throttle valve actuating system in an electronic control fuel injection system for a spark ignition internal combustion engine which controls air flow rate as a function of fuel flow rate, wherein a throttle valve is made to be able to be opened and closed by a throttle actuator and pneumatic actuator in order to reduce the electric power consumption and to avoid the actuation delay with the variations of the operating conditions and environmental conditions. The throttle valve is operated by such a separate actuating power source as a step motor or the like without directly connecting the throttle valve to an accelerator pedal.

Abstract: A system for rapidly warming up a catalytic converter provided to an automotive internal combustion engine to purify the exhaust gas. The system includes a vacuum-operated device to increase the opening degree of the throttle valve by a predetermined degree to thereby increase the quantity of the exhaust gas and another vacuum-operated device to retard the ignition timing of the engine to a predetermined extent to thereby raise the temperature of the exhaust gas. The two devices are connected by a vacuum passage to the intake passage of the engine at a section downstream of the throttle valve in series, and an electromagnetic valve renders the vacuum passage effective to thereby actuate the vacuum-operated devices only when the engine is idling under cold condition. Because of the series connection of the two devices, an intake vacuum is applied to the two devices in desirable sequence.

Abstract: Controls are provided to directly or indirectly avoid operation of the internal combustion engine of a motor vehicle in a range of speed and output power which is detrimental to engine efficiency. The controls become operative upon attainment of a predetermined limit value for engine parameters.

Abstract: The invention relates to a speed limiting device for a vehicle driven by an internal combustion engine provided with a twin-body carburettor or a dual fuel injection unit comprising two throttle butterfly valves controlled by the vehicle's accelerator pedal through an operating mechanism, a flexible connection mechanism combined with at least one of the said throttle valves and a depression valve calibrated at a given depression value corresponding to a vehicle speed not to be exceeded and designed to operate, above the said given speed, in the direction of closure, at least one of the said throttle valves combined with the said flexible connection means.The flexible connection means (3-7, 15) is placed between the said throttle valves (P.sub.1, P.sub.2), one of which (P.sub.1) is controlled by the movements of the accelerator pedal, and comprises a spring (6) of the right stiffness to lock the said throttle valves (P.sub.1, P.sub.