Abstract: An engine speed limiter is disclosed in which the ignition primary winding is shorted to limit engine speed whenever an ignition pulse is received by a switch at the same time that a switch is gated on by a positive output pulse from a timing circuit. A signal conditioning circuit receives a positive-going pulse from the ignition primary winding and outputs a conditioned signal to the timer to begin the timer's positive output signal. The speed limiter is suitable to be retrofit onto existing ignition systems.

Abstract: An internal combustion engine stop device comprises a power generation winding 1 for generating electric power corresponding to the rotation of an engine to charge a capacitor 2 for an ignition coil 4; a self-reset type stop switch 11 having normally opened contacts; a self-holding circuit 24 for bringing the output of the power generation winding to a short-circuit state and holding the short-circuit state; and voltage restraint or malfunction prevention elements 32, 36-38 arranged between the stop switch and the power generation winding to restrain a voltage applied to the stop switch.

Abstract: A distributor fuel injection radial piston pump comprising a distributor piston movable between first and second axial positions to communicate a pump working space with an injection nozzle and to prevent communication between the pump working space with the injection nozzle, a control valve for controlling a quantity of fuel fed to the injection nozzle and movable between open and closed position to communicate the pump working space with the pump interior therethrough in the open position thereof to prevent feeding of fuel to the injection nozzle and blocking communication between the pump working space and the pump interior therethrough in the closing position thereof to provide for feeding fuel to the injection nozzle, and means for preventing excessive feeding of fuel to the nozzle in case of failure of the first control valve to move from the closing position thereof to the open position thereof in response to a predetermined control signal, the preventing means including a control space defined at leas

Abstract: An arrangement for supplying fuel from a supply tank to an internal combustion engine of a power vehicle comprises a supply aggregate arranged to be located in a supply tank and a supply pump provided with a suction opening, a suction chamber having a first opening communicating with an interior of the tank and a second opening, a storage chamber supplied from fuel return conduit extending from the internal combustion engine and communicating with the suction chamber through the second opening, a blocking member arranged in the suction chamber and forming a valve with a limiting structure of the second opening, the valve closing the second opening until the suction opening formed in the suction chamber is immersed in fuel which flows from the tank into the suction chamber, the blocking member being arranged in a fuel suction stream and held from the latter on an abutment facing toward the suction chamber, whereby it releases the first opening, the blocking member in the event of an interruption in the fuel su

Abstract: An improved engine shut-off system is provided in which the likelihood of a safe failure is maximized and the likehood of an unsafe failure is minimized. Both terminals of the engine's first safety stop switch are connected in the ignition circuit so that if either wire leading to a stop switch terminal is grounded or breaks, a fail-safe condition exists. A first terminal of the first stop switch is connected in circuit to the main coil's primary winding, and the second terminal is connected in circuit to either the control switch means or the trigger coil. An optional second stop switch may be used in conjection with the first stop switch. The optional second stop switch may be a seat switch.

Abstract: Return fuel from the engine is routed through the fuel tank vent pipe, blocking it and preventing fuel fill while the engine is running.

Abstract: This invention relates generally to fuel control systems for combustion engines such as gas turbines used in helicopters and the like, and more specifically relates to a fuel control transfer system which permits the substitution of one fuel control device for another which is supplying fuel to an operating combustion engine, without interruption of, or adverse effect on continued operation of the engine.

Abstract: A throttle valve control device for an automotive engine is disclosed which comprises, in addition to an actuator for driving the throttle valve, an electromagnetic clutch for disconnectably connecting the actuator to the throttle valve, and control means for driving the actuator and the electromagnetic clutch, an interrupter circuit which, being inserted between the electromagnetic clutch and the driver circuit thereof, interrupts the supply of the driving current to the electromagnetic clutch when the following two conditions are satisfied simultaneously: (1) the brake of the automobile is operated by the operator, and (2) the automobile is running at a speed not less than a predetermined level, e.g. 5 km/h. Thus, even if failures occur in the fail detector or the clutch driver circuit in the control means, the automobile can be safely decelerated and stopped by the operator who operates the brake pedal.

Abstract: A device for detecting a malfunction of a fuel evaporative purge system comprises a temperature sensor for detecting a temperature inside a canister. During the absorbing and purging operations of the purge system, the device calculates changes in the temperature when absorbing and purging and compares the temperature changes with predetermined values denoting that the purge system is operating normally, and determines whether a malfunction has occurred in the purge system from the result of the comparison.

Abstract: A valve operation mode changing system for the intake or exhaust valves of an internal combustion engine is controlled in response to engine speed and temperature of the working oil utilized in the system in such a way as to permit the valve operating mode to be changed from a low-speed to a high-speed mode in response to engine speed requirements only when the temperature of the working oil exceeds a predetermined value. The system also provides for terminating fuel supply to the engine when the temperature of the working oil is below a predetermined temperature and the speed of the engine exceeds a predetermined temperature.

Abstract: A low fuel shut-off system for a Diesel engine which includes a fuel supply circuit comprising a main fuel tank, a transfer pump, a filter array, an injection pump, injection nozzles, and an auxiliary fuel tank in the fuel circuit between the transfer pump and the injection pump. A level sensor in the auxiliary fuel tank provides a signal when the fuel level drops below a predetermined point, with the signal being used by associated electrical control to shut down the engine while a supply of fuel still remains in the fuel supply circuit between the auxiliary tank and the injection pump, and in the auxiliary tank, which is sufficient to start the engine without priming.

Abstract: A safety device for use on chain saws to prevent one-handed operation of the saw. A swingable bar structure is carried on the saw housing to connect with an engine carburetor throttle arm. Before the engine can develop sufficient power to move the cutter chain the user must manually draw the bar structure to a specific position alongside a hand grip structure on the saw housing. One of the user's hands will engage the safety device bar structure; the other hand will operate a trigger mechanism. Both hands must be used before the cutter chain can begin to move.

Abstract: An electronic control system for an engine of a vehicle is provided with an idling RPM set-point regulator to deliver at its output a nominal idling speed control signal, and a summer for combining the control signal with a modulating error signal which is generated in response to a detection of a defect in a component part of the vehicle. The modulated nominal control signal causes a corresponding change in the normal running of the engine during idling operation or during reduced load thus signalling to the operator a faulty condition. Additional warning means are provided for generating optical warning signals, and means for generating the modulating error signal to be supplied to the electronic control system when a defect occurs in the warning means.

Abstract: In a safety device for electronic velocity control or regulating systems for motor vehicles with idling regulation in which a desired value can be fed to a setting device for the power of the engine of a motor vehicle and in which the setting device comprises a setting controller, an output stage and a setting member, there is provided a switch device which prevents the regulating of the output stage in a direction towards an opening of the throttle valve as a function of an output signal of a comparator. An actual-value signal corresponding to the position of the throttle valve and a limit value can be fed to the comparator, the limit value, at least upon a disconnection of the control or regulation, assuming a value necessary for idling control.

Abstract: An internal combustion engine protection system utilizes lubrication oil pressure to directly protect an engine against failure of the lubrication oil system. The protection system comprises a yieldable base member assembly that replaces the conventional fixed surface of a governor housing for resisting the governor centrifugal weights and high speed spring. The yieldable base member assembly comprises a cylinder and piston arrangement. Lubrication oil is directed to a chamber in the cylinder behind the piston. As long as the lubrication oil pressure maintains the desired value, the piston remains fixed and functions as the conventional fixed surface. Should lubrication oil pressure fall for any reason, the governor high speed spring and centrifugal weights force the piston to move in the cylinder. The high speed spring and centrifugal weights also move to actuate fuel control racks to an engine shut down condition.

Abstract: A brake switch is provided for producing a brake signal when a brake pedal of the vehicle is depressed. A vacuum switch is provided for producing an acceleration signal when the pressure in an intake passage exceeds a predetermined value. Engine speed sensor is provided for producing an engine speed signal when the engine speed exceeds a predetermined speed. In response to the brake signal, acceleration signal and engine speed signal, a control unit operates to cut off the transmission of power of an engine and shifts the transmission to the neutral range.

Abstract: An arrangement for protecting an engine from an abnormal condition such as overheating by slowing of the engine through periodic misfiring of the spark plugs. In order to prevent backfiring, the engine is stopped if the slowed condition is such that backfiring might occur.

Abstract: A device for detecting a malfunction of a fuel evaporative purge system comprises a pressure sensor for detecting gas pressure in a purge passage connecting a canister to an intake pipe, and an intake vacuum sensor for detecting a negative pressure in the intake pipe. In the purging condition, the device determines whether the obtained relationship between the detected negative pressure in the purge passage and the detected intake vacuum is within a predetermined area and judges that a malfunction has occurred in the system when the relationship is not within the predetermined area.

Abstract: A warning system for an air-fuel ratio control system for a electronic controlled internal combustion engine, where a basic fuel injection amount is corrected by a feedback correction factor determined by a signal from an air-fuel ratio sensor arranged in an exhaust pipe. An amplitude of the feedback correction factor caused by an acceleration of the engine, where the exhaust from cylinders is not completely mixed, is detected, and a warning can be given when the amplitude of the feedback correction factor is larger than a predetermined value. A malfunction in the air-fuel ratio system occurring in one cylinder can be detected. In a double O.sub.2 sensor system, where a sub-feedback loop is provided for correcting the feedback correction factor in accordance with a signal from the second O.sub.

Abstract: A fuel controller for an internal combustion engine has a crank angle sensor which generates a cylinder recognition signal corresponding to a prescribed cylinder of the engine. If a microcomputer 12 determines that the cylinder recognition signal has not changed during the occurrence of a prescribed number of changes in the level of a crank angle signal, the cylinder recognition signal is determined to be abnormal and fuel injectors of the engine are not actuated if the engine has been running for at least a prescribed length of time, thereby cutting off the supply of fuel to the engine.

Abstract: A brake activated accelerator override apparatus for an engine having a throttle plate pivotal between closed and open positions. First and second throttle levers are connected to the throttle plate. The first throttle lever is connected to the accelerator linkage for pivoting the throttle plate to an open position. A coupling spring is connected between the first and second throttle levers to jointly pivot the first and second throttle levers to the open position upon movement of the accelerator linkage and to permit independent movement of the second throttle lever to the closed position. A sensor detects actuation of the vehicle brakes and energizes an actuator connected to the second throttle lever to pivot the second throttle lever and the attached throttle plate to the closed position, independent of the first throttle lever. Preferably, the actuator is an electromechanical solenoid having an extensible plunger which is connected by a link to the second throttle lever.

Abstract: A safety system associated with an engine of a marine vessel wherein the safety system includes a blower, a control unit, and a plurality of sensors. A vacuum sensor is coupled to the intake manifold of the engine of the vessel for the detection of pressure at the intake manifold. The vacuum sensor transmits a signal to the control unit, with the signal having a characteristic corresponding to the pressure at the intake manifold. Detection of a vacuum condition associated with engine idling or low cruise operation causes the control unit to activate the blower. The safety system includes interactive heat sensors and vapor sensors to monitor the atmosphere in an engine compartment. Detection of a volatile environment activates the blower and triggers both an audio and a visual warning.

Abstract: An accelerator sensor is provided for detecting the degree of depression of an accelerator depression pedal of a vehicle. A torque sensor is provided for detecting the output torque of the transmission. The torque detected by the torque sensor is compared with a predetermined value. When the detected torque is larger than the predetermined value, an engine stop signal is produced, thereby stopping operation of the engine.

Abstract: The invention is directed to a control circuit for controlling the speed of an electric fuel pump for an internal combustion engine having fuel injection and includes a speed limit-value comparator for controlling the speed or delivery rate of the fuel pump to a value below the minimum speed or delivery rate for a speed of the engine above a specific predetermined limit speed which is impermissibly high. The minimum speed or minimum delivery rate is then the delivery rate which is required for at least building up the system pressure in the fuel injection system.

Abstract: An accelerator sensor is provided for detecting depression degree of an accelerator pedal of a vehicle, and a torque sensor is provided for detecting output torque of an engine. A memory stores reference torques which are arranged in accordance with depression degree of the accelerator pedal and engine speed. The torque detected by the torque sensor is compared with a reference torque derived from the memory in accordance with the depression degree of the accelerator pedal and engine speed. When the detected torque deviates from a permissible range with respect to the derived reference torque, abnormality is indicated.

Abstract: An engine fuel fow shut-off system particularly adapted for off-highway dumper trucks includes a spring biased fuel shut-off valve interposed in the fuel supply conduit to the truck propulsion engine, which valve is held open by a manual valve actuator and a pneumatic cylinder and piston actuator engaged with the valve actuator. Compressed gas charge bottles operable from the operator's cab and from a ground position in proximity to the vehicle boarding ladder supply pressure fluid to the cylinder actuator to disengage a pin from the valve actuator stem to permit closure of the valve and closure of a second valve to interrupt engine lube oil pressure to an engine injector system governor. The vehicle on-board fire extinguishing system is also operably connected to the cylinder actuator by way of separate pressure fluid sources to effect closure of the fuel shut-off valve upon actuation of the first extinguishing system from either the operator's cab or the ground position.

Abstract: A separate lubricating system for an engine including a lubricant reservoir and a system for delivering lubricant from the reservoir to the engine for its lubrication. A sensing device is provided in the lubricant system for sensing the lubricant flow and comparing it with a desired flow for providing a warning signal in the event of inadequate lubricant flow. The invention is illustrated in a specific embodiment as applied to an outboard motor.

Abstract: Disclosed is an emergency bypass mechanism to route fuel around an electrcally controlled fuel flow regulator of a combat vehicle when flow through the regulator becomes severely restricted. The mechanism includes electrically actuated valves hydraulically in parallel with the regulator, the valves being partly controlled by signals generated during manually shifting of the vehicle's transmission and partly controlled by a system of switches in a control panel.

Abstract: A marine propulsion device comprising a propulsion unit including a propeller shaft adapted to support a propeller, and an internal combustion engine drivingly connected to the propeller shaft, the engine including a cavity adapted to house a liquid under pressure, a source of gas at a pressure different from atmospheric pressure, a whistle for producing a warning signal in response to communication between the source of gas and the whistle, and a valve for permitting communication between the source of gas and the whistle when the liquid pressure is below a specified value and for preventing communication between the source and the whistle when the liquid pressure is above the specified value.

Abstract: An engine protection device which has a valve assembly supplying engine oil to an hydraulic cylinder which in turn is attached to the throttle of an internal combustion engine or governor of a stationary engine. If the oil pressure drops below a predetermined level, a sensor in the valve unit will cause the oil to drain from the hydraulic cylinder so as to slow down or stop the operation of the engine. In addition to using the oil of the engine itself, air or gas can also be used.

Abstract: To monitor the functioning of a redundant safety fuel shut off valve in a diesel engine, the electric power supply for a controlling device for the fuel quantity adjustor of a fuel injection pipe is decoupled from the power supply for the control of the electromagnetic fuel shut off valve. A relay controlled by a driving switch of the engine has a contact whose opening is time delayed relative to the opening of the driving switch. The relay contact is connected for energizing the controlling device for the fuel quantity adjustor whereas the energization and deenergization of the fuel shut off valve is effected immediately via a decoupling member. When the driving switch is opened and the engine is running during the given time delay interval, an error signal is generated indicating a malfunction of the fuel shut off valve.

Abstract: A system is provided for generating an alarm when the fuel surface level of an engine driven generator becomes smaller than a predetermined value, and stopping the engine after a predetermined time lapse from generating the alarm. Fuel shortage is detected by a fuel caution unit to cause an alarm unit to operate and further cause an engine stop unit to operate. The fuel caution unit causes the engine stop unit to stop after a short time lapse if the engine is restarted after the detection of fuel shortage. The system further includes an oil caution unit, overload caution unit, battery caution unit and power monitor accessories unit.

Abstract: A valve operating control device for an internal combustion engine having a valve operating mode changing mechanism for switching the opening/closing operation of an intake or exhaust valve between a low-speed operation mode corresponding to a low-speed operation of the engine and a high-speed operation mode corresponding to a high-speed operation of the engine. A control device controls the operation of the valve operation mode changing mechanism according to the rotational speed of the engine for shifting the valve operation mode changing mechanism from the high-speed mode to the low-speed mode where the output torque of the engine is the same in the low- and high-speed operation modes of the valve operation mode changing mechanism and for shifting the valve operation mode changing mechanism from the low-speed operation mode to the high-speed operation mode at a second rotational speed that is higher than the first rotational speed.

Abstract: Safety device for motor vehicles utilizes a cam-like plate and linkage to prevent accidental acceleration of a motor vehicle when disengaging the vehicle's shift lever from the park or neutral position. The apparatus employs an electrical circuit to detect the position of the shift lever and the activation and deactivation of the brake foot pedal. Only after placing the vehicle into any drive position other than park or neutral, and releasing a pedally operated brake pedal, will the linkage permit the throttle of the motor vehicle to move from its idle position to any position selected by the operator upon later application of an operating force to the accelerator pedal. In this manner, the operator is assured that the motor vehicle will not accidentally be caused to lurch forward or backward at high speed.

Abstract: An ignition control system for an internal combustion engine which includes a microcomputer which operates to control the ignition timing in response to engine speed and engine temperature signals individually and in preselected combination with an engine air flow signal and/or a lubricant level signal during predetermined engine running conditions. These predetermined running conditions include low speed, warm up, overhead, cruising, and overspeed engine running conditions, as well as a low lubricant level condition. The ignition control system is also capable of detecting and responding to abnormal combustion running conditions and setting and optimum spark advance during the starting of the engine.

Abstract: Disclosed herein is a manually operated fuel bypass mechanism for an elecnic fuel injection system, the mechanism adapted for convenient installation on the exterior of an existing fuel injection system.

Abstract: A manifold flame arrestor system for use with an internal combustion engine having a plurality of cylinders, each cylinder having an intake port and means of ignition of combustible mixtures drawn into the cylinder through the intake port, and an intake manifold connecting the intake ports of a plurality of cylinders, the system serving to reduce the possibility of transmission of combustion producing flame from a cylinder into the intake manifold comprising a flame arrestor positioned between the intake manifold and each cylinder intake port, each flame arrestor permitting passage of combustible mixtures therethrough but prohibiting the passage of flame therethrough.

Abstract: In an engine control system which determines the amount of fuel to be injected on the basis of an intake pipe pressure detected downstream of a throttle valve and engine speed (D-EFI), fail-safe action is provided when a failure of an intake pipe on the downstream side of the throttle valve is detected. The fail-safe apparatus of the present invention is designed to signal the occurrence of an abnormality with the intake system when the throttle valve is not being opened, that is, the throttle valve is stationary or is closing, a vehicle speed variation exceeds its specific value and the engine speed exceeds its specific value. When these conditions are detected, engine power is controlled lower, thereby assuring vehicle driving safety.

Abstract: Deterioration detector system for catalyst in use for emission gas purifier, comprising; an emission passageway through which exhaust gas from internal combustion engine, passes by way of catalyst to facilitate the reducing and oxidizing reaction among the toxicant component of hydrocarbon, carbon monoxide and nitrogen oxide; a sensor placed at the emission passageway to position downstream of the catalyst against the exhaust gas flow so as to generate an output in direct proportion to air-fuel ratio in the exhaust gas; an annunciator arranged to activate in response to the output of more than the predetermined level generated from the air- fuel ratio sensor.

Abstract: Method and apparatus are described for determining the operability, or lack thereof, of a hydraulic pressure-operated selective coupling mechanism for operating an intake valve or an exhaust valve of an internal combustion engine during various modes of engine operation wherein a control means employed to operate the control valve effective for supplying hydraulic pressure to the mechanism is imparted with an indication of the selected mode of intake or exhaust valve operation and of the hydraulic pressure supplied to the mechanism and is operative to compare such indications to determine whether or not they coincide.

Abstract: A system for suppressing discharge of evaporated fuel gas is adapted to introduce the evaporated fuel gas generated in a fuel tank of an internal combustion engine into an intake passage, to suppress the discharge of the evaporated fuel gas into the atmosphere. The system comprises an evaporated fuel gas passage allowing the evaporated fuel gas within the fuel tank to be introduced into the intake passage and a controller variably controlling a cross-sectional area of the evaporated gas passage depending upon an operating condition of the engine. The cross-sectional area of the evaporated gas passage is controlled according to an amount of fuel supplied to the engine. In addition, the cross-section area of the evaporated gas passage may be controlled in response to the operating condition of the engine and may be controlled according to a preliminarily set comparative rotational speed in an idling condition of the engine.

Abstract: An electrically operated counter is associated with a valve communicating with fuel feed mechanism of a diesel engine. The valve has a first position which allows normal fuel flow to the engine and has a second position allowing only partial fuel flow to the engine. An electrically operated control is activated by the counter at a selected RPM reading of the counter to move the valve to its second position to reduce fuel flow to the engine and consequent reduction of power. The control has a delay therein for delaying operation of the valve for a selected interval after the RPM of the engine has reached the RPM setting of the counter. Activation of the delay is made apparent to the operator by a signal energized simultaneously with initial actuation of the delay. A signal may also be employed that is activated prior to the delay and its signal to warn the operator of impending governing functions.

Abstract: Apparatus for immediately shutting down the engine of a motor vehicle in the event that the throttle sticks in an open position. A connecting member is secured at one end of the throttle linkage of a carburetor and at the other end to a piston slidably contained within a housing. A cut-off spring acts between the housing and the piston with sufficient force to drive the piston against the push button actuator of a cut-off switch wired into the engine ignition system. The opposite end of the connecting member is attached to the throttle return spring which acts through the connecting member with a greater opposing force than the cut-off spring to prevent the piston from cycling the shut-off switch. In the event the throttle return spring breaks or the throttle linkage becomes jammed in an open position, the cut-off spring is released and the engine immediately shut down.

Abstract: An ignition delay vapor expulsion module is provided for accessory use with a boat. When activated, the module energizes an accessory ventilating fan for a predetermined time period. After this time period the fan automatically stops and the ignition is enabled so that the operator can start the engine. By preventing the operator from activating the ignition either before or during the ventilation process, explosive fumes may be safely and completely ventilated. An electronic timer and latching relays are used to implement the timing/switching functions.

Abstract: A system and method for optimizing the octane rating of fuel supplied to a vehicle. The system utilizes information resulting from the occurance of detonation to make recommendations regarding the fuel octane requirements of the vehicle to the operator of the vehicle. The system can reduce the occurance of detonation by advising the operator of the vehicle when a higher octane fuel is required. Also, unnecessary expense resulting from the use of an excessively high octane fuel can be avoided by advising the operator when a lower octane fuel should be used.

Abstract: An anti-overrunning carburetion system which includes a carburetor with a throttle valve for opening and closing the venturi passage and a pressure responsive actuator having a pressure chamber for actuating the throttle valve to a closing position against a spring bias. A vibration responsive pneumatic pump, having also a pressure chamber, is connected to direct pressure directly to the pressure chamber of the actuator. A vibration sensor in the form of a spring backed ball is mounted to be subject to vibrations of an engine and is in communication with the pressure chamber of the pump and to atmosphere. In response to overrun conditions of the engine, the sensor will connect the pump pressure chamber to atmosphere and allow pressure to develop in the pressure chamber to be directed to the actuator, thus causing the actuator to reduce the throttle opening.

Abstract: An anti-overrunning carburetion system which includes a carburetor with a throttle valve for opening and closing the venturi passage and a pressure-responsive device for actuating the throttle valve to a closing position against a spring bias. A vibration responsive pneumatic pump is connected to direct pressure to the pressure responsive device and interposed between the pump and the pressure responsive device is a vibration sensor which will pass pressure from the pump in response to vibrations resulting from an overrun condition to effect a closing movement of the throttle valve.

Abstract: A fuel pumping apparatus for supplying fuel to a compression ignition engine includes a high pressure pump to which fuel is supplied by a low pressure pump by way of a throttle which is responsive to the output pressure of the low pressure pump for the purpose of providing a governing action. A valve is connected in series with the pumps and is energized to the open position through a pressure responsive switch which closes when the output pressure of the low pressure pump is above a predetermined value. Means is provided to energize the valve for the purpose of starting the associated engine.

Abstract: An anti-overrunning system for an internal combustion engine having a throttle valve in a carburetor in which an actuator for the throttle valve is responsive to pump pressure to move the valve to a closing position. A vibrating pump responsive to engine vibration is located to direct output control pressure to the actuator. A control valve between the pump and the actuator normally blocks pressure to the actuator but is responsive to air pressure from an engine cooling fan such that, upon overrun conditions, the fan pressure will actuate the control valve to connect the pump to the actuator to cause the throttle valve to move toward a closing position.

Abstract: An electrical speed control system for selectively connecting an accessory to a vehicle engine having a conventional alternator driven thereby, utilizes the voltage output of the alternator stator to determine the rotational speed of the engine, and permits the accessory to be connected to the engine when the shaft speed is at or below a maximum safe engagement speed, and disconnects the accessory when the speed is above a maximum safe speed for the accessory. The speed control system further prevents reengagement of the accessory after reaching and falling below the high-speed disengage point until the rotational speed of the engine has fallen below the maximum safe engagement speed level.