Abstract: Disclosed is a wheeled vehicle. The wheeled vehicle includes various features for operation by a rider, such as a throttle actuation assembly and various components for operation and manipulation of the vehicle.

Abstract: Provided is an rpm control device for a general-purpose engine, which is capable of realizing droop control in a spark-ignition engine only by the adaptation of isochronous control. When the droop control is selected, a rotation decrease rate (K) (value equal to or smaller than 1) is obtained from an engine rpm and a load. The result of multiplication of a basic target rpm (Nb) requested by a driver by the rotation decrease rate (K) is obtained as a target rpm (No). By setting the rotation decrease rate to a smaller value as the load becomes higher, the target rpm (No) is set smaller than the basic target rpm (Nb). The isochronous control is performed by using an electronic throttle so as to achieve the obtained target rpm (No) to realize the droop control in a pseudo-manner.

Abstract: An output control device of a vehicle is provided. A flow speed ratio calculator obtains a flow speed ratio which is a ratio between a flow speed of an intake air of the internal combustion engine realizing a current base request torque which is currently calculated and a flow speed of the intake air of the internal combustion engine realizing a previous request torque which is previously calculated. A base request torque corrector corrects the base request torque based on the flow speed ratio. A controller controls a driving parameter of the internal combustion engine according to the current request torque which is currently calculated based on the current base request torque corrected by the base request torque corrector.

Abstract: An output control device of a vehicle is provided. A flow speed ratio calculator obtains a flow speed ratio which is a ratio between a flow speed of an intake air of the internal combustion engine realizing a current base request torque which is currently calculated and a flow speed of the intake air of the internal combustion engine realizing a previous request torque which is previously calculated. A base request torque corrector corrects the base request torque based on the flow speed ratio. A controller controls a driving parameter of the internal combustion engine according to the current request torque which is currently calculated based on the current base request torque corrected by the base request torque corrector.

Abstract: An integrative control method and device for controlling gas engines is proposed which is improved load responsivity of the engine while maintaining air fuel ratio control.

Abstract: The present invention provides an internal combustion engine including an engine housing, a crankshaft rotatably supported in the engine housing, a cylinder, a piston movable within the cylinder, a combustion chamber in fluid communication with the cylinder, a fuel system configured to provide fuel to the combustion chamber, an intake passageway configured to provide a fluid to the combustion chamber, and a first regulator at least partially positioned in the intake passageway. The first regulator is selectable from a plurality of regulators. The engine also includes a coupling device configured to maintain the first regulator in the intake passageway, and a slot in the interior wall of the intake passageway that receives an end of the first regulator. The first regulator is configured to be removed and replaced by a second regulator from the plurality of regulators without disassembly of the intake passageway.

Abstract: An intake manifold assembly includes an intake manifold having an inlet configured to receive an air/fuel mixture from a carburetor, an outlet configured to discharge the air/fuel mixture into a combustion chamber, an interior wall at least partially defining an intake passageway fluidly communicating the inlet and the outlet, and an aperture in the interior wall. The aperture is positioned between the inlet and the outlet. The intake manifold assembly also includes a first regulator received in the aperture and at least partially positioned in the intake passageway to effectively decrease the cross-sectional open area of the intake passageway. The first regulator is selectable from a plurality of regulators configured to each be at least partially positionable in the intake passageway. The first regulator is configured to be removed and replaced by a second regulator from the plurality of regulators without disassembly of the intake manifold from the carburetor.

Abstract: An integrative control method and device for controlling gas engines is proposed which is improved load responsivity of the engine in transient operation.

Abstract: An integrative control method and device for controlling gas engines is proposed which load responsivity of the engine is improved while maintaining air fuel ratio control and stable control is performed when fuel gas of different calorific value is used.

Abstract: Mass air flow sensing for internal combustion engines. In one aspect, a sensor adaptor for use in an internal combustion engine includes an inlet housing including an approximately 90-degree elbow and directing air within the inlet housing to the internal combustion engine in an airflow direction. A mass air flow sensor is coupled to the housing at a location after the 90-degree elbow with respect to the airflow direction and senses the air flowing within the inlet housing.

Abstract: The present invention provides an internal combustion engine including an engine housing, a crankshaft rotatably supported in the engine housing, a cylinder, a piston movable within the cylinder, a combustion chamber in fluid communication with the cylinder, a fuel system configured to provide fuel to the combustion chamber, an intake passageway configured to provide a fluid to the combustion chamber, and a first regulator at least partially positioned in the intake passageway. The first regulator is selectable from a plurality of regulators. The engine also includes a coupling device configured to maintain the first regulator in the intake passageway. The first regulator is configured to be removed and replaced by a second regulator from the plurality of regulators without disassembly of the intake passageway.

Abstract: An abnormality determination apparatus for an intake amount control mechanism according to the invention includes a control portion which sets an allowable range of an opening amount of a throttle valve which provided in an intake passageway of an internal combustion engine based at least on an index value of an engine operation state, including an operation amount of accelerator, and on a lift working angle of an intake valve, and which determines that an abnormality is present in a state of driving of the throttle valve if an actual opening amount of the throttle valve is outside the allowable range set.

Abstract: It is an object of the present invention to expand an air flow measuring range of a thermal type air flow measuring instrument. A squeeze 157 is provided upstream of a thermal type air flow measuring instrument 100 of a main air passage 155 to expand an air flow measuring range on the low flow rate side. Furthermore, a slit 158 is provided to introduce air from the outside of the main air passage 155 to a position downstream of the squeeze 157 where flow exfoliation occurs without passing thorough a main air passage inlet 156 to prevent a pressure drop from increasing at a high flow rate and expand the air flow measuring range on the high flow rate side.

Abstract: A variable flow control method and device between an air intake and a throttle comprise at least one one-way valve with suitable restoring function between the air intake and the throttle, especially for a fuel-injected car. Corresponding functions can be generated among the one-way valve, an air intake manifold and the throttle to adjust and control an engine so that the engine can rapidly get various rotating rates corresponding to various degrees of vacuum respectively as natural or original air taking can be effectively and rapidly accelerated when the accelerator is trampled rapidly, and reflect the improvement on performances responding to torsion and acceleration of the various rotating rates.

Abstract: A device for estimating the amount of intake air of an internal combustion engine comprising intake pipe pressure calculation means for calculating an intake pipe pressure, at this time, downstream of the throttle valve, and intake air amount calculation means for calculating the amount of intake air, at this time, based on the intake pipe pressure at this time calculated by said intake pipe pressure calculation means, is provided. The intake pipe pressure calculation means calculates the intake pipe pressure at this time by using the intake pipe pressure calculated at the last time and the amount of air passing through the throttle valve at the last time calculated by means for calculating the amount of air passing through the throttle valve.

Abstract: An intake air amount control apparatus for an internal combustion engine is provided with: an opening control mechanism and a variable valve mechanism, which control an intake air amount; an intake characteristics change mechanism for controlling the intake air amount by adjusting a parameter or parameters different from those of the above two mechanisms; and an intake amount control device for performing a cooperative control of these mechanisms upon the occurrence of any normal condition. The intake air amount control apparatus is also provided with: an abnormality detection device for detecting an abnormal condition in these three mechanisms; and a fail-safe device for controlling the intake air amount of the opening control mechanism out of these three mechanisms and controlling the other two mechanism, so as to fix their control amounts to constant values.

Abstract: Fuel supply system (1) for a combustion engine arranged in an inlet duct (2), which extends to the engine body itself. The system (1) comprises one or several air valves (5, 6), which are all mechanically connected with manually influenced linkages, such as a starting control, choke or throttle control linkages, as well as one or several nozzles (3, 4) located in connection with the air valves (5, 6). At least one air valve (5, 6) is influenced by a temperature sensitive device (10), so that the valve's (5, 6) angular position changes in at least one angular position, for instance an end position, by means of the valve or its linkage shaft (7, 8) being mechanically influenced by the temperature sensitive device, either directly or via an intermediate device.

Abstract: A method of processing signal for a thermal type flow sensor having a temperature dependence resistance employing platinum and the like and a holding member made of alumina for holding it so as to compensate for response delay when fluid flow is changed, in which, when the fluid flow is maintained in a stationary state, the so-called equilibrium state, by steps of setting in advance the relation between a flow related value which changes according to flow change and a first operational value showing the temperature characteristic of the holding member which changes according to flow so as to make the flow related value as a parameter, calculating the first operational value from the flow related value when flow is detected in accordance with the predetermined relation, comparing the calculated first operational value with the second operational value which is set in relation with the first operational value, correcting the second operational value so that it approximates the first operational value according

Abstract: Apparatus for controlling the air to gas ratio of fuel supplied to a gas engine that includes a conduit connecting the carburetor to the intake maifold of the engine. A throttle valve is located in the conduit for varying the flow area therethrough in response to load changes on the engine and a regulator device including a controller and gas regulator for changing the air to fuel gas ratio of fuel supplied to the engine in response to the position of the throttle valve.

Abstract: The invention is directed to a control system for a two-stroke engine for limiting a control quantity thereof such as the rotational speed. For this purpose, a pressure line including a valve is connected to the crankcase and leads to a pneumatic controlling member which is responsive to a mechanical or electrical signal (vibrations or electric pulse from the ignition system). By means of suitable transmission means, the movement of the controlling member is transmitted to the carburetor throttle, for example.

Abstract: Disclosed is a method of controlling the air-fuel ratio of an air-fuel mixture to be supplied to an internal combustion engine. The method employs a feedback control in which the control is made to maintain the air-fuel ratio at the stoichiometric level in accordance with the air-fuel ratio read through the detection of a component of the exhaust gas and, at least during the idling of the engine after the warming up of the same, a lean control in which the control is made to maintain the air-fuel ratio at the leaner side of the stoichiometric level. The lean control is allowed when the mean value of the engine speed over a predetermined period is greater than a predetermined reference value during the idling after warming up of the engine, while the feedback control is conducted when the mean value is below the predetermined reference value. Disclosed also is an apparatus suitable for carrying out this method.

Abstract: Apparatus for controlling the air to gas ratio of fuel being supplied to a gas engine that utilizes the pressure in the inlet of the carburetor and the pressure in the intake manifold of the engine to control a regulator that is used to supply gas to the engine. The control mechanism is responsive to a signal from an intelligence source, such as an exhaust gas sensor, for varying the air to gas ratio to a preset or desired air to gas ratio. A method for controlling the air to gas ratio of fuel being supplied to a gas engine wherein an engine function is sensed and a signal generated representative of the function. The signal is compared with a reference signal and a resultant signal is generated. Pressure is then generated that is representative of the resultant signal and the pressure is applied to the regulator to cause a predetermined rate of flow of gas to the carburetor, thereby controlling the air to gas fuel ratio to the engine.

Abstract: A constant speed driving device has an ejector for supplying negative pressure to an actuator which controls the engine's throttle valve. The ejector includes a diffuser communicating with the engine intake manifold downstream of the throttle valve and a nozzle communicating through a pressure responsive control valve with the intake conduit upstream of the throttle valve and downstream of the supercharger. A negative pressure suction port of the ejector communicates with the negative pressure inlet port of the actuator. The constant speed control device is capable of supplying, even in the operation of the supercharger, a sufficiently increased negative pressure to the actuator for operating the throttle valve without the need to provide a vacuum pump.

Abstract: In an engine air induction passage, a throttle controls air flow and an air valve is biased to a position which is a measure of the air flow. Linkage between the throttle and the air valve opens the air valve as the throttle is opened and closes the air valve as the throttle is closed; the linkage contains a dashpot which allows the air valve to move gradually from the position to which it is urged by the throttle to its air flow measuring position.

Abstract: A throttle valve opener for a throttle valve in the intake passage of a vehicle engine is actuated by suction pressure from the intake passage, the suction pressure being weakened by introduction of atmospheric air during certain operating conditions of the engine. Suction pressure for operating the throttle valve opener is cut off when the vehicle speed or the engine RPM exceed predetermined values, or when the engine's cooling water temperature rises above a predetermined limit. This system controls deceleration of the engine to reduce exhaust pollutants without adverse effects on the drivability of the vehicle.

Abstract: The internal combustion engine for a lawn mower or the like includes a carburetor, a throttle member or plate disposed in the carburetor throat and movable between an open position and a flow restricting position, a rotatable shaft carrying the throttle plate and connected to a movable air vane, an engine fan, such as a finned flywheel, for blowing air against the air vane and urging the throttle plate toward a flow restricting position, a torsion spring encircling the throttle shaft with a first end connected thereto for biasing the throttle plate toward the open position and adjustment means connected to the spring for adjusting the biasing force of the spring on the throttle plate. The adjustment means includes a speed control member or lever connected to the second end of the spring and mounted remotely from the throttle shaft for reciprocative movement in a direction transversely of the rotational axis of the throttle shaft between first and second spring force level positions.

Abstract: A fuel supply system for supplying fuel and for satisfactorily preparing the fuel-air mixture fed to a mixture-compressing, spark-ignited internal combustion engine which comprises an arbitrarily operable throttle element arranged in the air intake manifold wherein fuel can be supplied upstream of this throttle element. The throttle element is mounted on a rocking lever connected to a bearing shaft arranged outside of the air flow at the air intake manifold and is displaceable in the opening direction during full load and at higher speeds against the force of a compensating spring until the throttle element comes into contact, with a full-load stop, with the rocking lever. During full load and at low speeds, the compensating spring displaces the throttle element in the closing direction so that a rather large pressure drop occurs at the throttle element so that an improved conditioning of the injected fuel is obtained.

Abstract: A pneumatic diaphragm control member is proposed for a fuel injection device for internal combustion engines, especially for a boost-pressure dependent full-load stop, wherein the initial and end positions of a push rod provided with a control diaphragm and movable against a resetting spring can be varied, and wherein the effective pressure range is variable by means of separate adjusting means which do not affect one another. The push rod of the diaphragm control member contacts, in the unpressurized starting position, a stop screw mounted in the lid cover, and, in the pressurized end position, is in contact, by means of a counter stop attached to an extension of the push rod and adjustable in the direction of motion of the push rod, with a second end stop arranged in the pressure chamber. Thus, the bias of the resetting spring can be changed by changing the position of a bearing bushing for the push rod, which bushing serves as an abutment.

Abstract: Disclosed herein is a lawn mower comprising a blade housing, wheels for supporting the blade housing for movement along the ground, a rotary cutting blade supported in the blade housing, and an internal combustion engine carried by the blade housing and rotatably driving the rotary cutting blade. The engine includes a carburetor and 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. The engine further includes a movable air vane connected to the throttle control for moving the throttle control, a fan for impelleing air against the air vane so as to urge the throttle control to the flow restricting position, and a spring connected to the throttle control for urging the throttle control toward the open position.