Abstract: A system according to the principles of the present disclosure includes an engine cranking module and a throttle control module. The engine cranking module determines whether an engine is cranking based on at least one of an input received from an ignition system and engine speed, and generates a signal indicating whether the engine is cranking. The throttle control module selectively adjusts a throttle of the engine to a fully closed position when the signal indicates that the engine is cranking.

Abstract: A speed control system is for a vehicle having an engine including a carburetor with a throttle plate moveable between a minimum open position and a maximum open position. The speed control system includes a ground speed limiter mechanism operatively coupled with the throttle plate and configured to displace the plate toward the minimum position as ground speed of the vehicle approaches a predetermined maximum value. An engine speed limiter mechanism is operatively coupled with the throttle plate and is configured to displace the plate toward the minimum position as a speed of the engine approaches a predetermined maximum value. Preferably, a control linkage is connected with the throttle plate and is moveable between a first configuration, at which the throttle plate is disposed at the minimum position, and a second configuration at which the throttle plate is disposed at the maximum position, the two limiter mechanisms displacing the linkage.

Abstract: A carburetor with a single fuel system that is capable of ensuring stable engine operation and lower fuel consumption. The fuel system comprises an electrical fuel control C that, in addition to mechanically coordinating the fuel flow rate with air intake by way of a metering needle 22 that operates in coordination with the throttle valve 3, opens and closes opening/closing valve 30 and cuts off and delivers fuel to the air intake passage 2 so as to maintain a required target rotational speed with little fuel consumption in a specific region of the degrees of opening of the throttle valve 3. Stable operation with minimal fluctuations in the rotational speed is ensured by cutting off the fuel when the rotational speed rises above the target rotational speed, and delivering the fuel when the rotational speed falls below the target rotational speed.

Abstract: A spud end fuel metering tube in an air-fuel mixing passage in a propane carburetor for enhancing performance of the system. The fuel supplying spud end is located in a venturi throat within the mixing chamber of the carburetor. The spud end includes linearly aligned fuel supply apertures that face downstream of the airflow therethrough. This combination provides increased power and fuel economy over a wide range of RPMs and demand levels while substantially reducing undesirable pollutant emission levels. The butterfly valve of the carburetor includes apertures formed therein for permitting the engine to idle when the butterfly valve closes eliminating the necessity for other downstream ports.

Abstract: A dashpot has a diaphragm provided for defining a pressure chamber and an atmospheric chamber, and an actuating rod secured to the diaphragm and operatively connected to a throttle valve. A cylindrical supporting member is secured to the diaphragm, opposite to the actuating rod, and a spring loaded valve is provided on an end of the cylindrical supporting member. A pipe secured to the dashpot body and having an opening at an end thereof, is projected into the pressure chamber. The opening is disposed to be closed by the spring loaded valve when the diaphragm is deflected by the throttle valve. A solenoid operated valve is provided to communicate the pressure chamber with the atmosphere through the pipe when opened. the diaphragm and the spring loaded valve are arranged such that the spring loaded valve closes the opening of the pipe at a smaller stroke than that of the diaphragm.

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 control system for ignition timing and exhaust gas recirculation which includes a vacuum controller operated by a power source of negative pressure to advance the ignition timing, an EGR valve operated by a power source of negative pressure to recirculate the exhaust gas, a temperature sensing valve sensing an engine temperature which introduces atmosphere to the vacuum controller as well as to the EGR valve when the engine temperature is low, a pressure control valve which introduces the atmosphere by a flow ratio substantially in inverse proportion to a pressure of the exhaust gas, and a negative pressure line which introduces a negative pressure at a portion in a carburetor at an upstream side from a throttle valve to the vacuum controller and the EGR valve, whereby the vacuum controller and the EGR valve are controlled in connection with each other.

Abstract: A method for controlling the quantity of supplementary air being supplied to an internal combustion engine during idling operation thereof in a feedback manner responsive to the difference between the actual engine rpm and desired idling rpm. When the engine is operating in a decelerating condition with the throttle valve fully closed, a provisional value of desired idling rpm is set, which is larger than a proper value of desired idling rpm by a predetermined amount. The quantity of supplementary air is controlled in a feedback manner responsive to the difference between the actual value of engine rpm and the provisional value of desired idling rpm for a predetermined period of time from the time a predetermined condition of feedback control for bringing the engine rpm to the provisional value of desired idling rpm has been satisfied as a result of comparison between the actual value of engine rpm and the provisional value of desired idling rpm.

Abstract: An engine revolution speed control device includes sensors (8, 9, 10) for detecting parameters representing the engine conditions, an actuator (7) for controlling the reset position of the throttle (13), a switch (11) producing a signal when the throttle action returns under the control of the actuator (7) and a device (12) which is cyclically driven under the condition that no signal from the switch (11) exits. The device (12) takes in one of the data from the sensors (8, 9, 10) and operates the actuator (7) by a predetermined amount in such a direction as to close the reset opening of the throttle every time that the amount of variation in the data taken in reaches a predetermined value.

Abstract: A HC emission controlling apparatus for use in an automobile is equipped with a catalytic type emission disposal converter (system) as an anti-pollution measure, having a deceleration emission controlling device such as a dash pot engageable with the throttle valve lever and connected to a vacuum control device. The apparatus includes a deceleration emission controlling device connected through a vacuum-transmitted valve to the vacuum controlling device, the vacuum controlling device being provided with a change-over valve which is adapted to be actuated by a temperature-sensitive actuating member. The change-over valve brings the vacuum-transmitted valve into communication with the atmosphere and with a vacuum source, respectively, before and after the warming up of the engine.

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: Disclosed herewith an intake air flow rate control system for an internal combustion engine including a means for detecting acceleration and deceleration of the vehicle and controlling the air flow rate in response to required air flow rate which is varied by acceleration and deceleration of the vehicle. The means temporarily operates to vary the air flow rate at the time of acceleration or deceleration in which the throttle valve angle sensor turns between on to off or off to on. After increasing or decreasing the air flow rate responsive to acceleration or deceleration of the vehicle, the increased or decreased value is gradually returned to the normal control ratio at a given rate and a given timing.

Abstract: A system for controlling no load operation of an internal combustion engine is provided wherein an actual engine speed signal and a target engine speed signal are compared and the air flow past a throttle valve is controlled to reduce the difference between these two signals. Subsequently, an actual air fuel ratio and a target air fuel ratio are compared and the air fuel ratio of the mixture to the engine is controlled to reduce the difference between the actual and target air fuel ratio signals. During deceleration of the engine, air flow is controlled to maintain the manifold vacuum smaller than a predetermined value so as to prevent unnecessary enrichment of the mixture due to the vacuum and then air fuel ratio is controlled to reduce the difference between the actual air fuel ratio signal and a target deceleration air fuel ratio signal.

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: An air-fuel ratio control device of an internal combustion engine having a carburetor. An air bleed passage is connected to a fuel outflow passage of the carburetor, and an electromagnetic control valve is arranged in the air bleed passage. The control valve is controlled by the detecting signal of an oxygen concentration detector arranged in the exhaust passage so that the air-fuel ratio of a mixture fed into the cylinder of an engine becomes equal to the stoichiometric air-fuel ratio. When the vehicle is decelerated, the mean value of the potential level, which has been applied to the electromagnetic control valve before deceleration, is stored. When the throttle valve is opened during the deceleration and, then, the oxygen concentration detector detects that a rich air-fuel mixture is fed into the cylinder of the engine, the above-mentioned mean value is instantaneously applied to the electromagnetic control valve.

Abstract: A throttle positioning system is provided for holding a throttle valve at a position slightly more open than at the normal idling position, and an idle vacuum advance mechanism is provided for advancing the ignition timing when the throttle valve is at a position less than a predetermined opening degree. The idle vacuum advance mechanism is disabled from advancing the ignition timing when the throttle positioning system is operating.

Abstract: A method and apparatus for the reduction of emissions of noxious gases from a carburetor-supplied internal combustion engine for use with an automotive vehicle during periods of deceleration is disclosed. The positioning of one or more butterfly gas valves controlling the flow of gases into the engine is controlled such that during periods of deceleration the gas valves are partially opened in proportion to both the speed of the engine and the level of vacuum in the intake manifold of the engine.

Abstract: The throttle valve of an automotive engine carburetor is positioned at times by a vacuum servo means to maintain or establish a predetermined engine idle speed rpm. The engine exhaust gas recirculation (EGR) valve is also controlled by a vacuum servo means to schedule EGR flow. The two servo means time share the vacuum by means of a computer controlled type electronic control so that when the throttle valve is in closed throttle idle speed position, the EGR servo means is not controlled, and when the throttle valve is in an off-idle setting, the EGR servo means is operative and the throttle valve servo means not.