Abstract: In internal combustion engines with external ignition the fuel metering is often interrupted during overrun operation for the purpose of saving fuel. It is proposed to inhibit this blocking of the fuel supply in those cases where the danger of slipperiness because of ice or snow exists. This danger is addressed by means of the method of measuring and evaluation of the intake air temperature and/or the temperature in the vicinity of the motor vehicle. Besides the possibility of realizing the invention from the block switch diagram, it is also pointed out that the electronic control device in accordance with the present invention can also be implemented relatively easily within the confines of a computerized control of the fuel metering.

Abstract: A system controlling the spark timing for an internal combustion engine having ignition plugs, a fuel supply control system for cutting off the fuel supply to the engine including a fuel supply cutoff delay means is disclosed.According to the present invention, there is provided a system for controlling the spark timing comprising a means for retarding the spark timing from an optimum spark timing whose value is derived on a basis of the engine speed or engine speed and air flow rate per rotation, whereby the shock generated due to abrupt changes in engine torque when the fuel supply cutoff delay means is operated are reduced.

Abstract: A fuel supply cut control device comprising an electronic control unit for controlling the injecting operation of a fuel injector. When the throttle valve is closed to the idling position under an operating state where the engine speed is higher than the cut speed, the fuel injection of the fuel injector is stopped. After this, when the engine speed is reduced below the resume speed, the injecting operation of the fuel injector is started. When the vehicle speed is high, the cut speed and the resume speed are low, and when the vehicle speed is low, the cut speed and the resume speed are high.

Abstract: A carburetor and associated control apparatus for an internal combustion engine. The carburetor includes a carburetor head having a fuel inlet conduit and an air inlet conduit communicating with a fuel mixing chamber. The carburetor further includes metering means for controlling the amount of fuel and air entering the mixing chamber. The mixing chamber connects to an expansion chamber through a control orifice in the carburetor head. The carburetor also includes a carburetor housing having a throat that communicates with the expansion chamber and with an air delivery passage. Air entering the throat is metered with an air valve that is moved with respect to the air delivery passage in correspondence with the fuel metering means.1. Technical FieldThis invention relates generally to fluid distribution apparatus having multiple valves and, more particularly, to carburetors and associated control apparatus for internal combustion engines.2.

Abstract: A method for controlling an internal combustion engine equipped with a fuel injection valve fitted to its intake manifold. Repeatedly values are determined of a first quantity approximately representing the proper amount of fuel to be injected, at least partly based upon signals from an air flow meter and a revolution sensor. Simultaneously, repeatedly the current value of a second quantity approximately representing the actual amount of fuel to be injected is determined, at least partly based upon signals from the air flow meter and the revolution sensor, an average value of all the successive instances of the value of the first quantity in some time interval up to the present is determined, and the current value of the first quantity is compared with this average.

Abstract: An engine control apparatus comprises a fuelcut control circuit for terminating delivery of fuel to the engine when the throttle valve opens at an angle less than a predetermined value and the transmission is in high gear or in neutral. The apparatus also comprises means for preventing the fuelcut control circuit from terminating fuel delivery to the engine when the pressure stored in a brake booster increases to a level insufficient for application of braking to the vehicle.

Abstract: Fuel is cut off during deceleration and detection of a racing condition. The racing and deceleration detected by the rate of reduction of the rotational speed of the engine. In the case of fuel cut-off during the racing condition, the fuel injection amount after completion of fuel cut-off is increased. A plurality of injections of increased fuel are carried out once every two cycles of the engine.

Abstract: An electronic fuel supply control system for internal combustion engines which carries out the engine fuel cutoff while the engine is decelerated either with a predetermined delay or immediately depending on engine driving conditions, and preferably on the state of the transmission, thus reducing the jolt produced when the fuel cutoff is carried out.

Abstract: An internal combustion engine provided with a system for controlling the predetermined idling rotational speed N.sub.F of the engine, and a system for operating a fuel injector so that the injector is de-energized when the rotational speed is higher than N.sub.cut and the injector is energized when the rotational speed is lower than N.sub.RTN. A value of N.sub.cut is the product of N.sub.F and a predetermined positive value .alpha..sub.1 and the value of N.sub.RTN is the product of N.sub.F and a predetermined positive value .alpha..sub.2 (<.alpha..sub.1).

Abstract: Fuel is cut off in the deceleration of a vehicle to improve efficiency of fuel consumption. Rotational speed of an engine in the resumption of fuel supply in the completion of the fuel cut-off is set to a value smaller than that otherwise set when a brake device is operated or the vehicle speed is higher than a predetermined value. While the torque of the engine varies abruptly to produce impact when the fuel cut-off is completed, passengers have a slight feeling of impact while the vehicle is being braked and travelling with high speed. Thus, while the feeling of impact is reduced, a period of fuel cut-off is increased to improve further the efficiency of fuel consumption and others.

Abstract: Fuel consumption of a declerating automotive vehicle internal combustion engine is reduced while preventing stalling. In response to a valve for selectively supplying air and fuel to the engine being in a fully closed condition, a first signal is derived. In response to the engine speed dropping below a first predetermined value a second signal is derived. In response to derivation of the first and second signals a controller for the valve is activated. The controller responds to engine and brake responsive parameters of the vehicle for opening the valve in respone to any of: (a) the engine being decelerated under no load, and (b) the brake being abruptly applied and (c) the engine speed dropping below a second value. The second value is less than the first value and is determined in response to the rate of change of engine speed.

Abstract: Disclosed is a fuel supply control system for controlling fuel amount to be supplied to an internal combustion engine including a sensor means for detecting engine load condition and other control parameters and generating sensor signals, an arithmetic means for determining a basic pulse width of a pulse signal indicative of basic fuel amount to be supplied, a means for correcting the basic pulse width of the pulse signal corresponding to various control parameter respectively indicative of engine conditions such as engine coolant temperature and a means for distinguishing engine driving condition based on inputs one of which is sensor signal indicative of engine load condition and generating correction command indicative of correction coefficient. The correction command is applied to the correction means to effect the same to increase or decrease the pulse width of the pulse signal or shut off the fuel supply to the engine.

Abstract: A spark-timing control system is disclosed for an internal combustion engine having spark plugs and means adapted to cut off the supply of fuel to the engine under specified engine operating conditions including engine deceleration, low engine speed, and throttle idle position. The control system comprises a digital computer which performs the operational steps of: setting an optimum spark-timing value in terms of engine load; and providing an ignition signal to cause sparks at the spark plugs after a retard from the set optimum spark-timing value when engine acceleration occurs under a fuel cut-off condition.

Abstract: A fuel-saving and emission reduction system for internal combustion engines includes electronic carburetor controlling circuitry and a carburetor by-pass system which stops fuel flow to the engine when power from combustion is not required. A normally open by-pass control butterfly valve in the fuel/air passage between the throttle valve and the engine intake manifold is operated by a motor, such as a solenoid or the like, under control of the controlling circuitry and is closed only upon release of the engine throttle and during the period that the vehicle has sufficient speed to assure restart upon reapplication of the fuel/air flow. A carburetor by-pass valve is held in a normally closed position by the combined effects of spring bias and the normal vacuum in the fuel/air passage.

Abstract: An electronic fuel injection control internal combustion engine which is provided with a feedback control system for maintaining a predetermined constant idling speed and a system for controlling the operation of the fuel injector during the deceleration condition of the engine. A value of the rotational speed when the fuel injector is stopped or recovered is increased during the deceleration condition of the engine.

Abstract: A control device for Diesel engines is proposed in which a rapid shutoff of the engine can be effected by evacuating the suction chamber of the injection pump. The control device includes a supply pump and a reversal valve, which in a stop position connects the suction chamber with the intake side of the supply pump and connects the compression side of the supply pump with the fuel tank. A check valve is provided in the supply line between the supply pump and the fuel filter which, when closed, is vacuum-tight; this check valve is disposed to open toward the filter, counter to the force of a valve closing spring. Another check valve, comprising an overflow valve determining the suction chamber pressure, is provided in an overflow line leading from the suction chamber to the fuel tank; this overflow valve is also vacuum-tight when closed. When the reversal valve is actuated by an electromagnet, a similar key-actuated shutoff to that known in gasoline engines can also be effected in Diesel engines.

Abstract: A method and apparatus for shutting off liquid flow such as fuel in a carburetor during certain sensed conditions, in which an adjustment is provided for further controlling the liquid at times when the liquid is not shut off. When used on a carburetor, idle fuel or injection water is shut off by a needle valve. The needle valve may be retracted to an "on" position. The "on" position is adjustable so as to provide a flow adjustment. Such an arrangement may be provided as an original design feature of a carburetor or may be added to existing carburetor designs, for example, as a kit.When used as an idle fuel shut-off, the needle valve is adjusted in the "on" position in a manner similar to conventional idle mixture adjustment using idle mixture adjusting screws. Thus, fuel in the idle circuit may be interrupted during engine deceleration, as detected by a high manifold vacuum condition, or during engine shut-off, as detected by an interruption in the engine's ignition circuit.

Abstract: A control apparatus for a fuel supply system for mixture-compressing, externally ignited internal combustion engines is proposed, which serves to interrupt the fuel supply to the engine during overrunning. The control apparatus comprises sensors which furnish signals according to the attitude of the throttle valve, as well as the rpm of the internal combustion engine and the temperature of a catalytic converter situated in the exhaust pipe, and further comprises means for the evaluation of these signals as well as for the interruption of the fuel supply to the internal combustion engine and the introduction of supplementary air during overrunning at catalytic converter temperatures above the proper operating temperature for that device.

Abstract: A fluid device for vehicle fuel consumption enhancement including a body defining a compressible chamber therein the body is connected to the throttle linkage to be compressed responsive to movement of the vehicle throttle in the acceleration direction, the chamber housing a fluid therein which is adapted to be expelled through a fluid bleed orifice upon compression of the chamber to control the force of movement of the vehicle throttle, the bleed being preferably variable to control the speed of movement of the vehicle throttle, the device further including a fluid return providing a means for the return of the expelled fluid back into the chamber upon the deceleration of the vehicle throttle and further including a safety valve positioned in fluid flow communication with the chamber and adapted to allow instantaneous expelling of substantially all of the fluid from the chamber responsive to a predetermined large amount of force being exerted against the vehicle throttle and thereby against the compressible

Abstract: A device is disclosed, which is intended for reducing the fuel consumption and the environmental pollution. An auxiliary power unit is provided, which is energized when a sensing mechanism signals to a signal-processing and control circuit that the engine is idling, for example, at a traffic light stop, or that a deceleration of the vehicle occurs. The fuel intake is cut off and a timing system provides to exclude the fuel feed to the engine for a certain selectable time. When such conditions are sensed, the auxiliary power unit (hydraulic or electric) provides to have the engine running without fuel use up. As normal traffic conditions are resumed, fuel is readmitted and the usual operation is started once again.

Abstract: In order to prevent undesirable abrupt changes in engine torque when the fuel supply to the engine is shut off at the onset of engine braking, the invention provides the gradual decrease of the amount of fuel supplied to the engine beginning with the onset of engine braking and continuing until fuel has decreased to approximately 80 percent of the normal amount at which time the fuel is shut off entirely. When engine braking stops or when the operator indicates a demand for acceleration, the fuel supply is initiated at the level of approximately 80 percent of normal and is increased thereafter up to the normal amount according to a second selectable function of time.

Abstract: An electronic controlled fuel injection system is disclosed for use in an internal combustion engine including a plurality of cylinders each fitted with a fuel injection valve. The system comprises a fuel injection control circuit timed to engine rotation for providing a drive pulse signal to the fuel injection valves. A deceleration detecting circuit detects deceleration of the engine in accordance with the positions of the associated throttle valve and foot brake. A coupling circuit is responsive to engine rotational speed for allowing or impeding the passage of the drive pulse signal to the fuel injection valves during deceleration.

Abstract: In an internal combustion engine in which the fuel supply is interrupted during no-load operation to save gas the ignition timing is retarded following resumption of the fuel supply to cause the resumed torque to be applied slowly. A sequence of ignition timing signals following the activation of the gas pedal is delayed by sequentially smaller and smaller amounts until the normal ignition timing is resumed.

Abstract: Apparatus for controlling the number of enabled cylinders of an internal combustion engine during deceleration comprises a plurality of comparators responsive to a signal indicative of the engine rotational speed upon deceleration of the engine. The threshold voltages of the comparators are arranged stepwise so that each comparator produces an output signal when the engine speed falls below each threshold voltage. The output signals of the comparators are supplied to logic circuits to control a plurality of switches via which the fuel injection control pulse signal is respectively applied to fuel injection valves to increase in a stepwise fashion the number of enabled cylinders from the fuel cut-off state thereby preventing occurrence of impacts or shocks in the transition period of reactivation of the cylinders upon deceleration.

Abstract: The engine crankshaft rotational speed is detected to be compared with stepwise arranged threshold speeds so as to stepwise enable fuel injection valves of respective cylinders during deceleration of the engine. Accordingly, the number of enabled cylinders is increased in a stepwise manner from a fuel cut-off state as the engine rotational speed decreases to prevent engine stall, while occurrence of shocks upon reactivation of cylinders is avoided. The threshold speeds are controlled in accordance with the variation of engine load which may be increased upon operation of auxiliary power consuming units, such as an air conditioner the compressor of which is driven by the engine, for preventing undesirable vibrations of the engine during the stepwise reactivation of the cylinders.

Abstract: Engine fuel control system includes a slow fuel passage for providing a supply of fuel mostly under a light load engine operation. A solenoid type shut-off valve is provided in the slow fuel passage so that the fuel supply is cut-off during deceleration. The valve is opened when the engine speed is decreased to a certain value to recover the fuel supply. The engine speed under which the fuel supply is recovered is lower when the vehicle brake is actuated than that when the brake is not actuated.

Abstract: A circuit for actuating control elements, for example a fuel shutoff valve in the carburetor of an internal combustion engine or a similar control element. The circuit is responsive to engine speed and to throttle valve position as monitored via the intake manifold vacuum. When the engine idles and the throttle is closed, the fuel control valve is held open to supply normal idling fuel or fuel mixture. However, if the engine speed rises above a threshold speed while the throttle is closed, the control circuit assumes a condition of engine braking and the fuel supply is interrupted. The switching threshold is established as the voltage on a capacitor controlling a transistor, the capacitor being charged continuously and being discharged during the occurrence of voltage spikes taken from the ignition coil of the vehicle.

Abstract: In order to enrich the fuel mixture fed to an internal combustion engine temporarily subsequent to engine braking, the invention proposes that engine braking is detected as the combination of a closed throttle and elevated engine speed. A detector for this condition supplies a signal to the fuel shut-off mechanism of a valve-control pulse generator. After engine braking, the counter is reset with the signal from the engine braking detector and counts engine-synchronous pulses. The counter contents are decoded and transformed into an analog signal which is used by the pulse generator for additional pulse extension to supply excess fuel to the engine for a limited period of time.

Abstract: A fuel injection system for an internal combustion engine includes an air suction pipe, a throttle valve located in the pipe, and a member, upstream of the throttle valve, which is actuatable by air flowing through the suction pipe so as to move a piston valve to dose a quantity of fuel to a fuel injection nozzle. The system includes a duct which bypasses the throttle valve, the duct having a valve which closes the duct when the throttle valve is closed and when the engine is above the idling speed. Dosing of fuel is thereby stopped during coasting of a vehicle, leading to decreased fuel consumption.

Abstract: Methods and means are disclosed for controlling the flow of gasoline through the idle jet of the carburetor of an automotive internal combustion engine. To improve mileage, flow through the idle jet is discontinued when the vehicle is traveling above a minimum speed provided that the vacuum in the intake manifold does not fall too low. Additional fuel economy may be obtained by stopping the flow of gasoline through the idle jet at any time the throttle is advanced and fuel flows through the main jets of the carburetor.In the simplest mechanical embodiment of the invention, the flow of fuel through the idle jet feed line is controlled by an atmospheric vent provided in the idle jet feed line. When the vent is open to atmosphere, the vacuum from the intake manifold is broken and no fuel will be drawn from the carburetor float bowl by the idle jet to the engine.