Abstract: An apparatus for preventing afterburning in an internal combustion engine having an ignition circuit, an ignition switch and a battery, and including an engine rotation detecting circuit for detecting the rotational speed of the engine above a predetermined level, a switching circuit actuated in response to the engine rotation detecting circuit which continues to energize the ignition circuit from the battery even after the ignition switch is turned off as long as the engine rotates at a speed above the predetermined level, and a timer circuit which cuts off the ignition circuit from the battery regardless of the condition of the switching circuit a predetermined time after the ignition switch is turned off.

Abstract: The specification discloses a motor kill system for automatically shutting off and killing an internal combustion engine to prevent damage to the engine from obstruction of the air cleaning system. The motor kill system includes a vacuum switch operating in response to a drop in the pressure between the air cleaning system and the intake manifold of the engine caused by obstruction of the air cleaning system. The preferred embodiment of the invention utilizes a normally open vacuum switch that closes to cause a solenoid to operate a butterfly valve to cut off the air supply to kill the engine. An alternate embodiment of the invention utilizes a normally closed vacuum switch which operates in response to obstruction of the air cleaning system to open the circuit between the ignition and the fuel pump to cut off the fuel supply and thereby kill the engine before any damage is done.

Abstract: A throttle closing mechanism for an internal combustion engine makes use of a throttle closer which is moveable into and out of a position wherein the closer engages the throttle linkage. An electromagnet is arranged to retain the throttle closer in the linkage engaging position when the ignition switch is on. When the ignition is disconnected, the closing mechanism moves out of the linkage engaging position, thereby facilitating complete closing of the throttle flap and preventing engine run-on.

Abstract: A variable position throttle stop and dashpot apparatus is shown as having a variably positionable throttle stop member having positions corresponding to and/or determining positions of engine idle throttle position and engine shut-down or anti-diesel throttle position with dashpot means effective for damping the rate of throttle closing movement regardless of whether the engine is operating or shut-down; resilient means are effective for moving the throttle stop member to a position for early engagement with linkage means associated with the throttle in order to thereby effectively damp the rate of closing movement of the throttle valve; and solenoid means is effective when de-energized to permit the throttle stop member to move to the anti-diesel position.

Abstract: A solenoid operated valve is positioned in the idle fuel mixture passage of the carburetor of an internal combustion engine of an automobile. When the automobile has reached a certain speed, if the driver releases the accelerator, a throttle linkage switch will close. Also, a vacuum sensing device will cause another switch to close thereby activating the solenoid valve to interrupt fuel flow through the idle fuel mixture passage. Thereafter, the solenoid valve will remain closed until the speed of the engine has decreased to a predetermined speed as measured by the amount of vacuum created by the engine. When the speed of the engine has decreased to the predetermined speed, or upon pushing the accelerator pedal, the solenoid valve will open again following fuel to flow through the idle fuel mixture passage. Upon turning the ignition switch OFF, the solenoid valve in the idle fuel mixture passage is closed to prevent dieselizing of the engine.

Abstract: In an air-fuel ratio adjusting system for internal combustion engine equipped with a carburetor having a bypass air passage for controlling an air-fuel ratio of an air-fuel mixture to be supplied to the engine, a bypass valve disposed in the bypass passage is so arranged as to be restored to its preset position, at which the air-fuel mixture with a proper air-fuel ratio is produced, whenever the engine is stopped, to thereby ensure a smooth starting of the engine even under the low temperature condition.

Abstract: An automotive engine ignition system which prevents either deliberate or accidental backfire when the ignition switch is shut off is disclosed. Means for automatically shutting off fuel to the carburetor and for limiting distributor timing is also disclosed.

Abstract: A throttle control system comprising a throttle member movable with the throttle and yieldingly urged toward a throttle closed position and a vacuum controlled positioning assembly including a housing, a diaphragm within the housing dividing the housing into two chambers. A stem is mounted on the diaphragm and extends from the housing through an opening. The plunger has a first cylindrical portion and a second portion including opposed parallel flat surfaces connected by arcuate cylindrical portions having the same diameter as the first cylindrical portion. The opening has longitudinally spaced portions. One portion is cylindrical and generally complementary to said first cylindrical portion of the plunger and the other portion has the same configuration as the second portion of the plunger. A spring yieldingly urges the diaphragm in a direction to retract the plunger inwardly of the housing.

Abstract: A solenoid actuated device to permit a carburetor throttle valve to close below the curb idle position upon deactivation of an ignition system for an internal combustion engine and to prevent electrical grounding by the device when it is out of contact with the throttle arm. The solenoid actuated device has an armature mounted in a housing for movement between energized and deenergized positions and a shaft extending through the housing is mounted within the bore of the armature for movement therewith. The shaft is in contact with the throttle arm adjacent one end and an electrical lead extends from the other end of the shaft. An insulating sleeve is positioned between the shaft and armature to prevent electrical grounding of the shaft when the shaft is out of electrical contact with the throttle arm. The insulating sleeve and shaft therein may be adjusted longitudinally relative to the armature to control the position of the throttle arm.

Abstract: A throttle positioner to ensure a predetermined minimum opening of a throttle valve when an engine is abruptly decelerated from a relatively high speed condition, said positioner being adapted to be switched over between operating and non-operating conditions by alternating the introduction of intake tube vacuum or atmospheric pressure into a diaphragm means, wherein a combination of a check valve and constricting means is provided to optionally determine the time constant of said switching over operation.

Abstract: A device is disclosed which may prevent engine dieseling, fuel waste, and reduce exhaust emissions by preventing idle system fuel mixture from entering the carburetor of a vehicle at various times.

Abstract: The specification discloses a motor kill system for automatically shutting off and killing an internal combustion engine to prevent damage to the engine from obstruction of the air cleaning system. The motor kill system includes a vacuum switch operating in response to a drop in the pressure between the air cleaning system and the intake manifold of the engine caused by obstruction of the air cleaning system. The preferred embodiment of the invention utilizes a normally open vacuum switch that closes to cause a solenoid to operate a butterfly valve to cut off the air supply to kill the engine. An alternate embodiment of the invention utilizes a normally closed vacuum switch which operates in response to obstruction of the air cleaning system to open the circuit between the ignition and the fuel pump to cut off the fuel supply and thereby kill the engine before any damage is done.

Abstract: An integral device for controlling the rate of throttle closure and for preventing after run of an internal combustion engine is provided which utilizes a pair of diaphragm assemblies for accomplishing both functional operations. The device includes a dash pot stem having an axial opening through it. The opening is operatively connected to a source of engine vacuum. A diaphragm housing defining a chamber has a pair of diaphragm assemblies positioned in it. A first diaphragm assembly is mounted to the dash pot stem. The second diaphragm assembly is movably mounted on the dash pot stem and includes a shaft extending through the housing. The shaft is engagable with suitable linkage means operatively connected to a throttle valve of a carburetor for the engine. Upon engine start, the application of engine vacuum to a first side of the first diaphragm operates on the diaphragm and housing so that, in effect, the housing moves in a first direction, positioning the shaft at its curb idle position.

Abstract: An apparatus to prevent after-burning, after the ignition key switch is turned off, in an internal combustion engine which is being warmed up, in which condition the choke valve is closed and the throttle valve is opened to a greater extent than during normal idling. The apparatus includes a pressure responsive actuator which, when activated, causes opening of the choke valve and/or closing of the throttle valve. The actuator is controlled by a switching valve which permits the actuator to be interconnected to either the open air or the air intake manifold at a location downstream of the throttle valve. When the igniton key switch is moved into an off or open position, the switching valve connects the actuator to the intake manifold to thereby actuate the actuator so that one or both of the throttle and control valves are appropriately moved.

Abstract: A unitary device for controlling the rate of throttle closure and for preventing after run of an internal combustion engine is provided with simplified structure, the structure using a single shaft assembly for both functional operations. The shaft assembly is operatively connected to a diaphragm assembly which moves in response to forces acting to position the shaft assembly. The shaft assembly is an axially aligned and concentrically arranged combination, and includes a first shaft element which acts against the diaphragm assembly to bring a carburetor for an internal combustion engine slowly to its curb idle setting upon throttle release from some running condition. A second shaft element of the shaft assembly is controlled by a solenoid. The second shaft element acts against the diaphragm assembly upon ignition system de-energization, and permits the closure of the throttle below the curb idle setting of the carburetor.

Abstract: A carburetor is disclosed which includes a supplementary fuel/air supply circuit for bypassing a throttle valve to provide a fixed fuel/air idle mixture. The supplementary fuel/air supply circuit includes separate fuel and air passageways which join at a mixing intersection. The mixing intersection communicates with a main bore of the carburetor at a point below a throttle valve thereof. The supplementary fuel/air supply circuit also includes a piston valve, which is responsive to manifold vacuum, to control flow of air through the air passageway so that the air passageway is open during periods of high manifold vacuum but closed during periods of low manifold vacuum. An idle-mixture adjusting screw is provided for adjusting air flow through the air passageway; a piston-stop adjusting screw is provided for tuning the position of the piston valve at its "closed" position; and, in one embodiment, a special plug is provided for holding the piston valve in a piston chamber.

Abstract: An automatic fuel control valve useful with, rotary, as well as 2-stroke cycle and 4-stroke cycle reciprocating internal combustion engines employs a rubber-like check valve and a porous plug in combination with a chamber for averaging recurrent vacuum pulses from the engine, in which the resulting average pressure is applied to maintain a fuel valve in the open condition while the engine is running and to permit the valve to close when the engine is not running.

Abstract: A fuel-air vaporizing apparatus including fuel metering means discharging a regulated fuel flow into a heated airflow within a conduit for subsequent and remote discharge into the air induction system of an engine. A nozzle structure, subjected to vacuum pressure, discharges fuel below an induction regulating valve. Fuel and air linkage, jointly operated by the driver's throttle, actuate said fuel metering means and the air induction regulating valve in a synchronized manner to provide an optimum, completely vaporized fuel-air mixture to the engine. An idle assembly controls engine operation during both idling and other closed throttle conditions. Said idle assembly functions to cut off fuel flow during vehicle deceleration with fuel flow resuming upon certain engine conditions being reached. Temperature responsive means are associated with both the idle assembly and the fuel-air linkage to assure optimum fuel-air ratios throughout a range of engine temperatures.