Abstract: A control system for an internal combustion engine having a plurality of cylinders and a switching mechanism for switching between an all-cylinder operation in which all of the cylinders is operated and a partial-cylinder operation in which at least one of the plurality of cylinders is halted. Operating parameters of a vehicle driven by the engine is detected. The all-cylinder operation or the partial-cylinder operation is performed according to the detected operating parameters. An oxygen concentration sensor is provided in an exhaust system corresponding to the at least one cylinder which is halted during the partial-cylinder operation. A failure of the oxygen concentration sensor is diagnosed in a predetermined operating condition including a fuel-cut operation of the engine upon deceleration. The partial-cylinder operation is permitted after completion of the failure diagnosis.

Abstract: A fuel cut control device that stops supply of fuel to an internal combustion engine during deceleration of the internal combustion engine having a throttle valve for each cylinder, which detects a maximum value of an intake pipe pressure during one combustion cycle of the internal combustion engine, starts fuel cut control when it is detected that the detected maximum value of the intake pipe pressure becomes less than a set fuel cut start determination value, and stop the fuel cut control when it is detected that the detected maximum value of the intake pipe pressure exceeds a fuel supply restart determination value set higher than the fuel cut start determination value to restart the supply of the fuel to the internal combustion engine.

Abstract: Evacuation operation performance is improved when any abnormality occurs in an electronic throttle control system. When any serious abnormality occurs, a first abnormality storage element (133) operates, a load relay for a power supply circuit (104a) of a throttle valve open/close controlling motor (103) is de-energized to operate a first alarm and display (109a). Thus a first device carries out the evacuation operation by a fuel cut control. When any slight abnormality occurs, a second abnormality storing element (136) comes to actuate thereby a second alarm and display (109b) being operated. Thus a second device carries out the evacuation operation using together a throttle valve opening control by the motor 103 and the fuel cut control.

Abstract: A combustion control system controls combustion in a direct fuel injection spark ignition engine that maintains a constant pressure in an accumulator when fuel is not being injected. The combustion control system controls combustion when fuel injection is resumed after being temporarily stopped. The combustion control system has a target fuel pressure acquiring section that acquires a target fuel pressure based on an engine rotational speed and an engine load, an actual fuel pressure detecting section that the actual fuel pressure, a timing acquiring section, and a first timing control section. The timing acquiring section acquires the fuel injection timing and ignition timing (50 and 30 degrees BTDC) based on the rotational speed and load. The first timing control section controls the fuel injection timing and the ignition timing based on actual fuel pressure, e.g., retards the fuel injection and ignition timings to 40 and 25 degrees BTDC.

Abstract: A governor for use in an engine provided with an overspeed protection device arranged to trip in the event that engine speed exceeds a predetermined speed. The governor comprises a centrifugal weight mechanism comprising at least one weight coupled to an angularly adjustable metering valve member through a lever member, the metering valve member being operable to control the level of fuelling of the associated engine depending on engine speed. The governor further comprises a damping arrangement associated with the lever member which is arranged to damp oscillatory movement of the lever member, in use, and a prevention arrangement for preventing the overspeed protection device associated with the engine tripping upon engine start up.

Abstract: A vehicle speed limiting system for a vehicle having an engine which includes a plurality of fuel injectors coupled to a low volume fuel injection pump operative to successively trigger a flow of fuel directly to the individual fuel injectors. The vehicle speed is converted to a speed signal which, when it reaches a preset limit, is utilized by the system control to close a fuel control valve through which fuel normally passes to the injection pump. The system is characterized by a low fuel residual upon cutoff by the fuel control so that the engine speed is quickly slowed for lack of fuel.

Abstract: According to a control strategy, a cylinder valve control device is monitored and operation of the engine is modified. The cylinder valve control device includes a driving shaft driven by the engine to drive an intermediate member which in turn drives a cam arranged to open an engine intake valve, and a driver which is operative in response to a command to vary an amount of eccentricity of the intermediate member with respect to a shaft axis of the driving shaft. During one mode of engine operation, the intermediate member is supported in a support for rotation about an axis in eccentric condition with respect to the shaft axis to accelerate and decelerate the cam with respect to rotation of the driving shaft. During another mode of engine operation, the intermediate member is in concentric condition with respect to the shaft axis to provide a synchronous motion of the cam with rotation of the driving shaft. In response to the eccentricity of the intermediate member, the engine operation is modified.

Abstract: A vehicle speed limiting system for a vehicle having an engine which includes a plurality of fuel injectors coupled to an inline, low volume fuel injection pump operative to successively trigger a flow of fuel directly to the individual fuel injectors. The vehicle speed is converted to a speed signal which, when it reaches a preset limit, is utilized by the system control to close a fuel control valve through which fuel normally passes to the injection pump, and also to simultaneously open a pressure regulator. The fuel control valve includes a small orifice to pass just enough fuel to prevent pump cavitation. The system is characterized by a low fuel residual upon cutoff by the fuel control valve so that the engine speed is quickly slowed for lack of fuel.

Abstract: A control device for a sucked air quantity of an engine comprises an accelerator pedal opening degree sensor for detecting an opening degree of an accelerator pedal; a throttle valve opening degree sensor for detecting an opening degree of a throttle valve; a throttle valve actuator for controlling the opening degree of the throttle valve in accordance with outputs of both the accelerator pedal opening degree sensor and the throttle valve opening degree sensor; a first fully-closed state detecting switch for detecting a fully-closed state of the accelerator pedal; a second fully-closed state detecting switch for detecting a fully-closed state of the throttle valve; and an abnormality determining means for determining that the control device for a sucked air quantity is abnormal when the throttle valve is not in the fully-closed state in case that the accelerator pedal is in the fully-closed state.

Abstract: An ignition system is provided for an internal combustion engine in which an amount of fuel necessary for combustion during one combustion and expansion stroke in one cycle of the internal combustion engine is injected toward respective cylinders, and the fuel is sucked, together with air, into the cylinders during respective suction strokes. The engine has a fuel cut control in which a fuel injection is cut off when the internal combustion engine is working under a predetermined condition. The ignition system includes a first unit for igniting mixtures of fuel and air in the respective cylinders in respective combustion and expansion strokes, and a second unit for detecting a cylinder into which the amount of fuel necessary for combustion has not yet been sucked completely when the fuel cut control ends. Also, the ignition system includes a third unit for controlling the first unit so that the mixture of fuel and air in the cylinder specified by the second unit is prevented from being ignited.

Abstract: In a method of traction control, fuel injectors are selectively disabled to unfuel respective cylinders of an engine to reduce engine torque output. The method provides for limiting the number of cylinders that can be disabled for acceleration spin control based on engine and vehicle operating parameters to improve traction control performance and provide protection for the vehicle catalytic converter.

Abstract: A traction control system controls the engine torque so as to prevent wheel slip during acceleration. The system has an electric control unit ECU which detects the state of wheel slip on the basis of the deviation of the drive wheel speed from a target drive wheel speed computed in accordance with signals from various sensors such as drive wheel speed sensors, trailing wheel speed sensors, shift position sensor for sensing the shift position in an electronic control transmission ECT, engine speed sensor and accelerator sensor for sensing the amount of operation of accelerator. The ECU computes, in accordance with the state of the slip, a limit drive torque which does not allow surplus wheel slip during acceleration.

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 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: Method and apparatus for supplying fuel to an internal combustion engine, which engine performs strokes for suction, compression, expansion and exhaust in sequence. The method comprises alternatingly supplying fuel to the engine and suspending the fuel supply to the engine in successive suction strokes. In a heavy load range of operation of the engine, the fuel can be supplied in each of the successive suction strokes. Various different embodiments of the apparatus for performing the above method are disclosed.

Abstract: In an externally ignited internal combustion engine for a vehicle with an electronic device for controlling the gas mixture composition and the point of ignition a leaner fuel-air mixture and the an earlier point of ignition is set before the maximum permissible speed is attained. The reduction of power of the combustion engine caused thereby shows the driver that the speed of the combustion engine approaches the maximum permissible speed at which the fuel supply and the ignition will be interrupted. This should cause the driver to release the gas pedal or switch into the next higher gear.

Abstract: An internal combustion engine comprises a plurality of cylinders disposed in circular array, each having a piston slidably received therewithin to define a combustion chamber. Connecting rods affixed to the pistons are provided with cam follower means for engaging a cam surface on a drum disposed coaxially with the aforementioned array, the cam follower means engaging different portions of the cam surface for causing the drum to rotate as the pistons fire. The drum is axially movable with respect to the array of pistons whereby the compression ratio of the engine is readily changed. Supercharging chambers are defined on opposite sides of said pistons from the combustion chambers for compressing a fuel-air mixture which may then be received into pressure tanks associated with the respective cylinders for delivery to the combustion chambers. The piston ends have helical surfaces for producing a swirling of gases within the combustion chambers.

Abstract: A speed limiting device for vehicles is described in which an actuator is responsive to a vehicle speed sensor to reduce air and fuel supplies to the vehicle engine when a predetermined vehicle speed is reached. The possibility of the vehicle driver overriding the device from the driver's position is eliminated by making electrical connections to supply power for the device direct to the vehicle's battery, and by inserting in the accelerator pedal linkage an compressible elastic strut which limits the force exertable on the throttle linkage by the driver.

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.

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: An automatic engine shut down device is operable in a system of the type including a pump having a suction inlet and a pressure discharge for discharging a liquid at a operational pressure, an engine for driving the pump, the engine being operable by an engine operating fluid, the engine including a control member for controlling the supply of engine operating fluid to the engine, the control member being movable between a first open position allowing operation of the engine and a second closed position shutting down operation of the engine. The automatic shut down device is operable, upon the removal or substantial reduction of suction at the inlet of the pump, to automatically terminate operation of the engine and thereby of the pump.

Abstract: Apparatus (10) for stopping an engine from a remote location relative to an operator's work station. An engagement apparatus (20) which is displaceable between first and second positions is engaged with an engine stoppage member (19) which, when rotatably displaced by the engagement apparatus (20) between two positions corresponding to the first and second positions of the engagement apparatus (20), can permit engine operation or induce engine shutdown. An actuating link (24) interconnected with engagement apparatus (20) is displaceable, when subjected to a momentarily applied external force, between engine operating and engine shutdown positions. A spring (30) biases engagement apparatus (20) towards the first and second positions when the actuating link (24) occupies the engine operation and shutdown positions, respectively.

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: The invention disclosed embraces a charge forming method of and apparatus embodying an instrumentality responsive to engine vibrations or disturbances brought into operation when the engine reaches a predetermined speed to automatically deliver excess fuel to the engine thereby momentarily providing a nonignitible mixture preventing overspeeding of the engine.