Abstract: An improved engine shut-down device is provided which includes a pressure responsive modular unit wherein an oil pressure responsive device normally prevents a fuel pressure responsive device from actuating an engine shut-down control. Both the oil pressure device and fuel pressure device include bellows actuators which minimize the possibility of fluid leakage and extend the life of the device.

Abstract: The invention relates to a fuel injection valve having a plug connection to the fuel line, wherein at least two sealing rings are provided between the connection stud and the fuel line nipple in order to obtain emergency sealing capacity.

Abstract: This invention discloses an air cleaning device for engines which is provided with a check valve within the induction pipe thereof to check the back flow of mixed fuel gas, and thereby prevent the engine back fire, particularly an intake air cleaner for engines in which a cyclone type dust collector having an electrostatic filter is used. In this invention is disclosed a device which can prevent the ignition of the mixed fuel gas and thereby avoid explosion of the said gas.

Abstract: An electromagnetic selector valve for changing the fuel paths between the fuel tank, fuel supply pump and fuel injection pump of an engine is energized by an energization control unit including a monostable multivibrator only for a predetermined time interval just after the engine key switch has been turned off. An on-off valve disposed in the pipe line between the fuel tank and the electromagnetic selector valve or the pipe line between the electromagnetic selector valve and the fuel injection pump, is opened during the time the engine is operating. When necessary, the on-off valve is continuously opened by another energization control unit including a monostable multivibrator for a predetermined time interval just after the engine key switch has been turned off.

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: An internal combustion engine arranged in an automotive vehicle with optionally driven units or the like, for example, units driven by way of pulleys. The units extend toward a front if the internal combustion engine is arranged in a front compartment of the automotive vehicle and extend toward the rear beyond the internal combustion engine if the engine is disposed in a rear compartment. The units and optionally their drive elements are fashioned in such a way and/or are mounted to the internal combustion engine in such a manner that, in case of a collision, impact energy is absorbed at the units and/or their fasteners or mounting by the performance of deformation work, by overcoming frictional resistances, and/or by a displacement of viscous substances against a resistance.

Abstract: A single optical sensor coupled to an oil return line in an internal combustion engine is coupled to a control circuit for determining during a first time interval when the engine is started whether the crankcase oil level is sufficient and during a second time interval after the engine is running whether the oil needs to be changed.

Abstract: A multi-stage latching device for a carburetor which controls the idle speed by defining various throttle plate positions according to deceleration sensor switch, air conditioning switch and ignition switch states. The mechanism which moves the throttle plate consists of a primary force coil which energizes an armature against spring return and the position of the armature coupled through a shaft establishes the idle speed. The throttle position is determined by any one of three adjustably disposed latch coils which when energized, magnetically couple to a casing to define a stop. A circuit control associated with each latch deenergizes the primary force coil while maintaining the magnetic coupling of the stop. With primary force off, the return spring forces the armature back against the energized stop and hence establishes the throttle position and idle speed.

Abstract: A diesel engine fuel supply and control system for an engine having a fuel supply pump which has its direction of rotation in accord with the direction of engine rotation is provided with engine shutdown, anti-bump start and reverse rotation arresting means including, in a preferred embodiment, a pressure responsive piston that acts against a run-stop control lever to cut off fuel supply to the engine cylinders and a selector valve that selectively exposes the piston to pressures on either side of the engine fuel pump. When the valve is set to provide the normal pump inlet pressure to the piston, the engine may operate in the forward rotation direction but is stopped if reverse rotation occurs. If changed to expose the piston to normal pump outlet pressure, the engine is stopped or prevented from operating in the forward rotation direction.

Abstract: Brake wear in a vehicle (11, 11a) may be reduced by an interlock (23, 23a) which blocks delivery of power to the wheels (13, 13a) or the like if an attempt is made to initiate powered travel while the parking brake (19, 19a) remains engaged. Rather than neutralizing the vehicle transmission (16, 16a), the interlock (23, 23a) responds to an engaged parking brake (19, 19a) accompanied by drive transmitting conditions in the clutch (18, 18a) and transmission (16, 16a) by suppressing power output at the engine (12, 12a). In one form the system overrides the operator's controls to limit fuel input to the engine (12) so that stalling occurs if start-up is attempted with the brake (19) engaged while in another form the system directly shuts down the engine (12a) under such conditions. Start-up of the vehicle (11, 11a) on a slope or under load is facilitated as the engine (12, 12a) may be accelerated while the transmission (16, 16a) is in gear and the brake (19, 19a) is still engaged.

Abstract: A fail safe device for isolating the revolution limiter from the ignition system of an internal combustion engine, in which the output stage of the revolution limiter is continuously monitored to ascertain whether or not it is absorbing ignition pulses at a speed lower than the limiting speed. In the event that the absorption of ignition pulses is taking place at a speed lower than the limiting speed, the fail safe device becomes operative upon the engine revolutions falling below a given value and causes a fuse in series with the output stage of the revolution limiter to blow, thus isolating the revolution limiter from the ignition system to allow ignition to be instantly re-established in the event of a fault occuring in the revolution limiter.

Abstract: This invention relates to a fuel supply system for an engine having a main fuel flow scheduling device, an auxiliary fuel flow scheduling device, a power demand adjuster operative to adjust both scheduling device, and a failure detector capable of detecting failure of the main scheduling device and of making the auxiliary scheduling device operative to control fuel flow to the engine following such failure. In the past, fuel systems of this kind have given an abrupt change of fuel flow on changeover to the auxiliary scheduling device giving the possibility of damage to the engine and danger to human life.In the present invention a metering valve 201 forms part of the auxiliary scheduling device 201, 246, 209, 221, 222, 231, 232, 233, 234 for continuous adjustment of the flow to the engine permitted by the main scheduling device 184.

Abstract: A system responsive to engine manifold pressure for monitoring engine operating efficiency and reducing engine load during periods of low operating efficiency is disclosed. The system includes a switch which actuates a first relay when manifold vacuum pressure drops below a threshold level. In this condition, the first relay activates a time delay relay in the control circuit of the air conditioning compressor to remove this load from the engine after a first interval and maintain it in the off condition for a second interval.

Abstract: In a liquid cooled engine or engine-driven accessory having an engine protection device for reducing the engine RPM to a safe level in response to a fluid pressure below an acceptable level, a temperature sensor valve continuously senses the operating temperature of the engine or engine-driven accessory and reduces the fluid pressure below the acceptable level of the engine protection device in response to an over-temperature condition or in response to a partial or complete loss of the liquid coolant. The temperature sensor valve includes a temperature sensing tip which is coupled to the housing of the engine or engine-driven accessory. A heat receiving section of the temperature sensing tip receives heat from the housing and a heat dissipating section which protrudes into the coolant filled chamber transfers heat received from the heat receiving section into the coolant.

Abstract: A very heavy vehicle may tend to run away on a steep gradient and as a result the engine is liable to be overspeeded with consequential risk of damage especially to its valve mechanism. The invention aims to prevent overspeeding by providing a servo mechanism operable automatically above a predetermined engine speed to apply an exhaust brake. The servo mechanism preferably comprises a centrifugal clutch normally held disengaged by springs and disposed on a shaft driven by the engine. Angular movement of the driven member of the clutch due to its engagement by engine speed in excess of the predetermined value is limited to, say, 60.degree. by a stop, and said member is mechanically linked to the operating means of the exhaust brake.

Abstract: A vapor sensitive resistor, or switch, is connected in a bridge network having the input connected to the battery of a marine engine. A window signal comparator includes a high limit operational amplifier and a low limit operational amplifier, each have a first input connected to the opposite sides of a reference resistor in the bridge network to establish relatively high and low reference voltages and second inputs connected in common to the sensing resistor. The amplifiers include a positive feedback and two outputs are connected to an "OR" logic gate which is connected to drive a two-stage transistor amplifier wholly on or off. An alarm device is connected in series with the amplifier to the battery. A test switch varies the circuit connection of the vapor sensitive resistor to simulate a high or low limit condition and thereby test circuit operation.

Abstract: A speed control system for controlling a vehicle's speed operates by means of limiting fuel flow to the engine of the vehicle at and above, a predetermined speed. the system comprises fuel line means to the engine, a fuel pump feeding the fuel line means, a fuel bypass from the fuel line means which is normally closed and a monitoring means for monitoring the speed of the vehicle and for opening the fuel bypass when the vehicle speed reaches or exceeds the preset speed to bypass the fuel from the fuel line means and limit fuel flow to the engine. The fuel bypass is provided with automatic pressure regulating valve means adjusted to maintain the amount of fuel flow in the fuel line means at all times for engine idling.

Abstract: A control system for automatic actuation of an exhaust blower associated with an internal combustion inboard marine engine. The control system includes a starter interlock circuit which prevents engine starting for a predetermined period of time to allow the blower to exhaust explosive fumes from the engine compartment and a low speed actuation circuit which operates in response to detection of engine speed below a predetermined level to actuate the exhaust blower. Also included is a emergency override of the starter interlock circuit.

Abstract: In a capacitor-discharge breakerless ignition system for an internal combustion engine, a safety interlock comprising a rectifier and a switch responsive to a preselected unsafe vehicle condition is connected in the charge circuit of the ignition capacitor. The rectifier is poled in the forward capacitor charge-voltage direction and is connected with respect to the switch such that the capacitor is not charged or, once charged, is discharged prior to engine ignition in response to an unsafe condition indicated by the switch, or in response to intentional or accidental breakage and/or short-circuiting of interlock/ignition interconnection leads. The rectifier and the switch are packaged in such a manner, preferably separate from the rest of the ignition, to deter tampering with the switch alone, and to permit locating the switch and rectifier remote from the ignition circuit. In one preferred application the rectifier-switch package is mounted on the handle of a rotary lawn mower to serve as a deadman switch.

Abstract: A safety device for controlling an ignition circuit for an internal combustion engine associated with a transmission coupling the engine to a load comprises a thyristor adapted to permit, upon conduction thereof, the ignition circuit to produce a high voltage to fire a spark plug provided in the engine, a position-responsive switch adapted to permit application of a trigger signal from a power supply to the gate of the thyristor only when the transmission is in neutral, and a capacitor coupled across the gate and cathode of the thyristor to be charged by a voltage drop thereacross and to provide a trigger signal to the gate of the thyristor. Once the capacitor is charged it maintains a condition wherein the thyristor is turned on whenever the thyristor is positively biased even after the transmission is in gear.

Abstract: An injection pump, especially for motor vehicles with a control rack and a centrifugal governor, in which the control rack is adjustable by way of a first vacuum box in dependence on the ignition key position and in which, in the stop position of the ignition key, vacuum is applied to the first vacuum box and the control rack is transferred into its turn-off position; a second temperature-dependent vacuum box adapted to be connected with vacuum is provided, whereby an end position corresponding to the full load position is adapted to be determined for the control rack by way of this second vacuum box above a predetermined engine limit temperature.

Abstract: Disclosed herein is a lawn mower including a blade housing, wheels for supporting the blade housing for movement along the ground, a rotary blade supported in the blade housing, and an internal combustion engine supported by the blade housing and rotatably driving the blade. The internal combustion engine includes a carburetor, 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, a movable air vane connected to the throttle control for moving the throttle control, and a fan for forcing air against the air vane and for urging the throttle control to the flow restricting position.

Abstract: An internal combustion engine spark ignition system is provided which ensures that sparks are inhibited if the engine temperature exceeds a maximum safe level. The ignition circuit includes an input transistor which is switched on and off by an engine shaft transducer. The input transistor controls charging and discharging of a capacitor the voltage on which determines whether switching of the input transistor causes a spark to be produced via an output amplifier and ignition coil. A temperature sensing element determines both the rate at which the capacitor can charge and the final voltage to which it can be charged.

Abstract: A safety arrangement for diesel engines to respond to an abnormal change of the ratio of the useful torque delivered by the diesel engine and the fuel quantity per power stroke. The latter is defined by the position of control rod of the injection pump. A transducer converts the control rod displacement into a mechanical or electrical control variable which is at least approximately proportional to the fuel quantity per power stroke. The control rod displacement is converted by a crank drive into a rotation of a correcting element, and the ratio of connecting rod length to crank radius is in the range between 6:1 and 8:1. The rotation angle of the correcting element is less than 90.degree. in the range between zero and full useful torque. The rotation angle range on either side of the crank position is 90.degree.. An electrical control variable may be generated by a transducer which is free of contacts and supplies a direct current signal proportional to the rotation angle of the correcting element.

Abstract: An improvement in fuel injection systems for diesel engines, by way of example, wherein, between the engine shutdown unit of the fuel pump and the air shutdown line from the cab there is interposed suitable structure which is responsive both to raised pressure in the fuel return line of the system and also to the air shutdown system for turning off fuel supply to the engine, either intentionally or by virtue of tampering with the fuel return line by the operator.

Abstract: Apparatus and a method are disclosed for flame-proofing an internal combustion engine by provision of a sensor for detecting the presence of flammable gases in the vicinity of the assembly, a canopy shrouding a hot surface of the engine, and a source of non-flammable fluid operable responsive to signals from the sensor to inject the fluid into the space between the canopy and the said surface, thereby cooling the hot surface and inerting the atmosphere within the canopy.

Abstract: A method and a device for stopping a fuel-injection internal combustion engine, in which the injection pump is of the multi-cylinder single-housing type, comprising in supplying the housing of the pump with pressurized gas for separating the pump plungers and tappets from their actuating cams.

Abstract: A control device for the fuel supply system of a fuel-injected internal combustion engine provided with a correcting device, which changes the adjusting path and/or the full load position of the fuel quantity adjusting member of the fuel metering device in dependence on operational values the operation of which is made visible by means of a signal indicator. The adjusting member of the correcting device is provided with opposed walls either of which is arranged to cooperate with a stop which is connected to the electrical circuit of the signal indicator, with the stop being mounted in the governor housing in such a manner that it is electrically insulated therefrom.

Abstract: A two-cycle air-cooled engine has a carburetor with a throttle valve operated by a manual control member. A heat sensitive valve mounted on the engine cylinder head closes to cut off a supplementary air supply to the induction passageway and thereby richen the air-fuel mixture to prevent seizure upon overheating. When the manual control member is in position corresponding to idling of the engine, the member actuates means which introduce additional air into the induction passageway leading to the engine, to lean the air-fuel mixture.

Abstract: Disclosed is a trouble warning device for an air-fuel ratio sensor mounted in an internal combustion engine. The trouble warning device comprises a comparator which compares the output voltage level of the air-fuel ratio sensor with a reference voltage whose level is higher than the output voltage level of the normally operating air-fuel ratio sensor and an indicator to give warning of trouble in response to the compared result. By using this trouble warning device, correct detection of trouble and reliable warning of trouble in the air-fuel ratio sensor can be obtained.

Abstract: Effective supervision of the road speed of a diesel truck requires termination of the operation of the engine when the truck is operated at an excessive speed. Utilizing to advantage what is already available, namely an engine shut-down control when the engine lubricating oil pressure is below a specified pressure, the device hereof provides the referred to road speed supervision in an effective manner and with minimum expense and complication. Specifically, the within road speed control contemplates creating an "artificial" loss of lubricating oil pressure, i.e. one that is not due to an actual defect or malfunction of the lubricating oil circulating system, but rather one that is responsive to the operation of the truck at an excessive speed. Said "artificial" loss of lubricating oil pressure is, of course, just as effective as an actual pressure loss in causing engine shut-off or slow-down, thereby providing effective road speed supervision for the diesel truck.

Abstract: An apparatus for detecting a deteriorated condition of an oxygen concentration sensor mounted in an exhaust pipe for an internal combustion engine for controlling an air-fuel ratio is described. The apparatus includes, in addition to the sensor, a reference oxygen concentration sensor mounted in the exhaust pipe downstream of a cleaning device, and a discrimination unit for determining the deterioration of the oxygen concentration sensor for controlling the air-fuel ratio by measuring at least one of a duty factor and a period of an output signal from the reference oxygen concentration sensor.

Abstract: A motorized bicycle which features a removable fuel tank. The fuel tank may be selectively secured within a housing mounted on the frame of the bicycle. The housing and tank include means which cooperate upon insertion of the fuel tank to permit fuel to flow from the tank to the fuel line for the engine of the bicycle. Removal of the tank from the housing automatically seals the tank against spillage of fuel and permits the bicycle to be safely transported. The fuel tank also features an air vent which is automatically opened when the tank is secured in the housing.

Abstract: An internal combustion engine for an automobile provided with an air conditioner which has an electromagnetic clutch capable of connecting the crankshaft of the engine with a compressor of the air conditioner. A switch mechanism is provided for engaging the clutch just after the ignition switch is opened to effectively brake the rotation of the crankshaft due to inertia by using a load of the compressor. Thus, the so-called "dieseling" can be prevented.

Abstract: A pre-oiling kit for an installation having a battery, an ignition switch, an internal combustion engine, an engine block and oil sump underlying the block, a port within the block leading to an oil gallery and a drain opening within the bottom of the sump, includes as a principal element of the kit; a container for mounting exterior of the block and housing a pre-oiler pump with an electric motor operatively coupled thereto, an oil pressure operated switch and an electrical relay. Two oil lines lead to the exterior of the container and are respectively connected to the inlet side of the pump through a strainer and from the outlet side of the pump through a check valve pressure switch and strainer.

Abstract: A protective device for internal combustion engines and/or vehicles embodying same including means for detecting one or more abnormal conditions of a part of such engine or vehicle such as the temperature of a part, clutch slip, or excessive engine speed, and means activated by the detecting means for at least partially dethrottling the engine and optionally also declutching same and/or applying the brakes in the case of a vehicle.

Abstract: In an internal combustion engine an automatic fuel pump switch connects a fuel pump motor to the battery. An electronic sensing circuit is connected to the output winding of an engine-driven alternator which is also connected to charge the battery. The sensing circuit includes a sensing transistor connected to continuously sense the two instantaneous voltages relating to ground that appear as alternating current (A.C.) voltages at the opposite ends of the alternator output winding and produces an output only when one voltage is above a selected positive level while the other voltage is lower than the first voltage by a minimum amount. A control transistor circuit is connected to the output of the sensing transistor and is turned on to operate the fuel pump only when the engine is turning over at a sufficient rate to start and run.

Abstract: An electrical circuit for use with an engine having an alternator has a relay to control a solenoid to properly shut down a diesel engine and includes openable and closable contacts for supplying power to another portion of the circuit, it being ensured that such contacts remain closed when either the vehicle key is in the on position or there exists an alternator output.

Abstract: A solenoid-operated fuel valve opens automatically when the engine is started to allow fuel to flow from a fuel tank to the engine and closes automatically when the engine throttle is moved to fuel-off position to shut down flow of fuel through the governor for the engine. In the event of an emergency, operation of a manual shutdown control will de-energize the fuel valve solenoid to shut off flow of fuel to the engine compartment and will also shut down the engine by energizing a solenoid to move the fuel rack for the governor to fuel-off position. Actuation of a fire-extinguisher system for the engine will automatically de-energize the fuel-valve solenoid and energize the fuel-rack solenoid. The fuel-rack solenoid remains energized for a timed period sufficient to ensure engine shutdown in emergency situations.

Abstract: There is disclosed an automatic control system for limiting the operating temperature of a diesel engine having a shut down lever that repositions the rack of its fuel pump to a shut down position that closes the pump metering valves and shuts off the fuel supply to the engine. The system includes a pyrometer to sense the exhaust gas temperature from the engine and generate a signal therefrom, a temperature controller having an adjustable, maximum set point temperature to receive the signal from the pyrometer and to generate a control signal which is applied to a control valve in a fluid pressure line which applies fluid pressure to a pressure responsive actuator that moves the shut down lever a fraction of its full travel necessary for shut down and thereby repositions the fuel pump rack to a throttling position in response to a sensed exhaust gas temperature which exceeds the preselected maximum set point temperature.

Abstract: A system which normally prevents an attempt to start an engine while the engine lubricant pressure is high. However, in an emergency it is possible to crank the engine even though the lubricant pressure is high by operating the start switch and main switch in the reverse of the usual sequence.

Abstract: Variable displacement type lubricating oil pump for two cycle engines having a displacement control element which is rotated in response to the engine throttle valve position. The control element has a cam which is so shaped that the pump displacement is changed in accordance with the engine throttle valve position. When the control element is accidentally disconnected from the engine throttle valve control device, the control element can be rotated beyond the minimum displacement position which corresponds to the engine idling position, whereby the pump displacement is increased than in the idling position.

Abstract: A signal indicating device for an internal combustion engine. The internal combustion engine has a sound absorbing shell surrounding the engine body. An air intake pipe is mounted on the engine and an air intake filter is mounted on the inlet end of the air intake pipe. The signalling device is provided to indicate the degree of contamination of the air filter. The signaling device can be a visual signal or an audible signal.

Abstract: An overspeed control system which is electropneumatic and automatic in its operation is supplied. An engine speed sensing transducer supplies input signals to an electronic monitor which determines if an overspeed condition is about to occur and turns on a warning indicator. If further overspeed condition occurs the monitor supplies an output signal to a solenoid operated air supply control valve which vents high pressure air to a pneumatically operated valve which shuts off the engine air intake. Means are provided for testing the operation of the electronic and pneumatic components of the system independent of the operation of the engine to ensure reliability of the system.

Abstract: In a liquid cooled engine or engine-driven accessory having an engine protection device for reducing the engine RPM to a safe level in response to a fluid pressure below an acceptable level, a temperature sensor valve continuously senses the operating temperature of the engine or engine-driven accessory and reduces the fluid pressure below the acceptable level of the engine protection device in response to an over-temperature condition or in response to a partial or complete loss of the liquid coolant.The temperature sensor valve includes a temperature sensing tip which is coupled to the housing of the engine or engine-driven accessory. A heat receiving section of the temperature sensing tip receives heat from the housing and a heat dissipating section which protrudes into the coolant filled chamber transfers heat received from the heat receiving section into the coolant.

Abstract: Apparatus for controlling fuel flow to an engine including means for disabling the operation of the accelerator pedal linkage associated with a carburetor is disclosed. The construction materially aids in preventing engine backfire. Included is a pivotable solenoid operated latch plate which forms part of an essential pivot point in the linkage arrangement and fixes the pivot point when current is flowing from the coil in engine ignition circuit.Solenoid operated means for stopping fuel to the carburetor and closing the passageway from the carburetor into the intake manifold are also shown.

Abstract: An automatic control system for turbo-charged truck Diesel engines incorporates one or more electronic or electromechanical timers for the operation of the fuel line solenoid valve and of the fast-idle solenoid, where fitted. The timers are automatically started upon the opening of the ignition switch, or are controlled from an independent control switch, in such a manner that upon the receipt of a `start` signal, the engine continues to operate for predetermined periods in the `fast idle` and `idle` speed regimes and is then shut down. These periods of operation at slow speeds permit the exhaust-driven turbocharger to attain equilibrium temperatures before engine shut-down.

Abstract: A closed-loop mixture control system for an internal combustion engine comprises an electronic control section and an electromechanical section comprised of the engine, an air-fuel metering system and an exhaust composition sensor. The system further comprises a first diagnosis circuit for testing the electromechanical section by application of a recurrent series of binary signals to the metering system, and second and third diagnosis for circuits for testing the function of the electronic control section by application of staircase waveform signal or a train of variable width pulses selectively to the input of the control section. The applied test signals are received by the respective diagnosis circuits to check the performance of the control loop.

Abstract: A safety device for a diesel engined vehicle comprises a key operated lock controlling starting and stopping of the engine and a steering wheel lock mechanism. The device is such that prevents the steering wheel from being locked while the engine is running.

Abstract: Disclosed is an exhaust gas recirculation apparatus for an internal combustion engine, which has a vacuum operated flow control valve arranged on pipe means connecting the exhaust manifold of the engine with the intake manifold of the engine. When the throttle valve is opened from its idle position during the operation of the engine, the flow control valve is opened in order to recirculate exhaust gas from the exhaust manifold to the intake manifold. The apparatus further has means for opening the flow control valve when so-called "dieseling" takes place after the operation of the engine is stopped. The exhaust gas due to the dieseling can be recirculated and, thus, the dieseling is instantly stopped.