Abstract: In one aspect, a digital engine control system for an aircraft engine is provided. The control system includes a selection unit, the selection unit including a monitoring module configured to determine a measurement of the speed of rotation of the engine from the output signal from one or more protection sensors and to compare the or each speed measurement determined by the selection unit with speed measurements supplied by electronic control units to determine an operating state of each electronic control unit.

Abstract: The present invention provides a cost-effective method and apparatus for controlling engine speed. One embodiment generally comprises a controller and a linear actuator. The controller generates a plurality of voltage pulses having a duration and frequency related to a difference between a desired engine speed and an actual engine speed. The linear actuator converts the plurality of voltage pulses into a throttle position.

Abstract: The low cost speed governor for internal combustion engines may be completely powered by the ignition coil. The governor receives a periodic signal from the primary ignition winding that is indicative of the actual speed of the engine. A pulsed speed signal is generated that is functionally related to the periodic signal. The pulsed speed signal has a pulse width that is functionally related to the actual engine speed. A pulsed reference signal is generated by a timer circuit, and has a pulse width that is functionally related to a predetermined reference speed. The pulsed speed signal is then compared with the pulse reference signal by a comparator circuit, and a pulsed error signal is generated that has a pulse width which is functionally related to the difference between the speed signal pulse width and the reference signal pulse width. The speed of the device is then changed by a transistor bridge network as a function of the error signal.

Abstract: The invention is directed to a control system in combination with an internal combustion engine and/or a motor vehicle especially in connection with the air metered to the engine. An electrically actuable element for influencing an operating variable of the engine and/or of the vehicle is present. A control unit acts on the electrically actuable element by means of a pulse-shaped signal. At least one changeable parameter of the pulse-shaped signal is changed during a pulse dependent upon actual measured values.

Abstract: In the throttle valve control system for controlling a throttle valve by an actuator driven on the basis of PWM command signals generated according to accel pedal stroke and feed-backed throttle sensor signals, the throttle sensor signal obtained when the throttle valve is full closed is stored; the throttle sensor signal obtained when a full-close PWM command signal is applied to the actuator is detected; the full-close PWM command signal is corrected so that the stored throttle sensor signal matches the detected throttle sensor signal; and PWM command signals are generated on the basis of the corrected full-close PWM command signal. Therefore, it is possible to obtain a full-close PWM command signal whose pulse width accurately matches the actual throttle valve full-close position, irrespective of error or offset due to dispersion of the throttle sensor characteristic or A-D conversion characteristic of the control system.

Abstract: A small portable generator powered by a gas fueled internal combustion engine. The gas fuel supply system for the engine includes a solenoid value whose duty cycle is regulated so as to permit unthrottled operation of the engine and afford engine speed control.

Abstract: A method and apparatus is provided for controlling the solenoid current of a solenoid valve which controls the amount of suction air in an internal combustion engine. A solenoid current control value is calculated as a function of engine operating conditions and a corrected solenoid current control value is determined as a predetermined function of the solenoid current control value. The solenoid valve is controlled as a function of the corrected solenoid current control value. The solenoid valve is controlled by generating a pulse signal having a duty ratio which is a function of the solenoid current control value.

Abstract: A method and apparatus are provided for controlling the solenoid current of a solenoid valve which controls the amount of suction air in an internal combustion engine. The actual solenoid current flowing through the solenoid is detected and a solenoid current control valve is calculated as a function of engine operating conditions. A corrected solenoid current control value is determined as a function of the solenoid current control value and a pulse duration signal is determined as a function of the corrected solenoid current control value. A feedback control term is calculated as a function of the actual solenoid current and the corrected solenoid current control value. Further, a temperature corresponding to the solenoid temperature is detected and a temperature correction value is generated corresponding thereto.

Abstract: A system for automatically limiting the maximum speed of a vehicle to a predetermined maximum, particularly suitable for use with off-road vehicles such as aircraft deicing trucks. The system utilizes a magnetic Hall effect sensor to generate a speed signal which is compared to a signal representative of a preselected maximum vehicle speed. In response to the comparison a pulse-width modulated control signal is generated and used to control a transistor in series with the ignition coil primary thereby intermittently disrupting the ignition system.

Abstract: An automatic speed control for a heavy duty vehicle includes a controller which regulates communication between a compressed air source and an air actuated throttle mechanism. The controller generates a control signal which is a function of a speed error signal and the position of the air actuated throttle to regulate the compressed air source. The speed error signal is calculated as the difference between a commanded speed signal and an actual speed signal. To generate the control signal, the error signal and throttle position signal are operated on by different lead-lag transfer functions. These lead-lag terms are thereafter combined with a proportional speed error term to yield the desired control signal. The system further includes a throttle control feature for powering auxiliary equipment when the actual speed signal is zero. Another feature of the control limits the commanded speed signal to a set value when it exceeds a predetermined limit.

Abstract: A servo apparatus for automatic control of vehicle engine speed, in accordance with a speed error signal, has an electric motor connectable to open the engine throttle against a restoring force, and the motor torque is controlled by varying the pulse width of the motor drive current. The pulse width is controlled by the error signal through a feedback stabilized amplifier and in addition, motor back emf is sampled and used to control the pulse width during motor braking phases.

Abstract: A control circuit for a speed governor is disclosed which provides governing action of one type for operation in a normal engine speed governing mode and governing action of a different type for engine operation in a power take off (PTO) mode. In the normal mode, the throttle control means is actuated between wide open throttle and a close throttle reference position. In the PTO mode the throttle control means is actuated between an open throttle reference position and the close throttle reference position. An overspeed sensing circuit is operative to allow the throttle control means to be driven past the close throttle reference position in an overspeed condition. A PTO selector switch is provided which is operative to provide different governed speeds for the PTO and normal modes.

Abstract: An idle control system for an automobile internal combustion engine includes an idle control unit for controlling the operation of an electromagnetically operated actuator. While the engine has a combustible mixture intake passage leading to the engine and a throttle valve operatively positioned inside the mixture intake passage for controlling the flow of a combustible air-fuel mixture towards the engine, the actuator is utilized to adjust either the effective cross sectional area of a bypass air passage leading from the air source to the mixture intake passage at a position downstream of the throttle valve or the opening of the throttle valve, to control the engine speed during idling to a predetermined value.

Abstract: A fluid actuator for electrically detecting the running speed of a vehicle and processing the detected data and an electric control system for driving said actuator are provided, and in the electric control system a delay involved in the response of the fluid actuator to a change of the running speed of the vehicle is compensated for in advance by a filter means to thereby automatically maintain a constant running speed of the vehicle.

Abstract: A speed regulator or governor for an engine. The governor utilizes the approximate digital equivalent of a lead and a lag feedback network in combination with a stored, digital, nonlinear look-up table, or other nonlinear means, to control engine speed. The governor controls the engine at different fixed engine speeds in response to demand, or at continuously variable engine speeds in response to demand.

Abstract: A diesel engine control system comprises an engine speed circuit for controlling the engine so that the rotational speed of the engine when idling is at least the required minimum rotational speed suited to the determined engine speed, engine temperature, and battery condition. Thereby, the engine control system makes it possible to control the rotational speed of the engine automatically when idling without manual operation.

Abstract: An automatic speed control for a vehicle having a source of compressed air, such as a heavy duty truck, includes a logic controller which controls a pair of solenoid valves to regulate communication between the compressed air source and an air actuated throttle. The controller is responsive to initiation of speed control by actuation of the appropriate switch by the vehicle operator to use inputs representing wheel speed (or engine speed) and the position of the vehicle throttle to generate an error signal. The controller compares the error signal with a signal representing a desired or memorized speed set by the vehicle operator and controls the air actuated throttle accordingly.

Abstract: An electronic injection-amount regulating apparatus in auto-ignited internal combustion engines in which the injection amount can be regulated by means of a regulator preferably having a PID characteristic and in which the injection amount is apportioned via a solenoid actuator and which includes a safety switching arrangement having an integral timing circuit resettable at each initiation of a control impulse for the solenoid actuator to prevent damage to the solenoid actuator in case of failure of the control signal, as well as a switching circuit for engine starting enhancement in a predetermined rpm range having as its most significant concept a series switching arrangement which includes a low-pass filter and a controllable threshold switch.

Abstract: A governor system for an engine motive fluid induction system is shown as having a solenoid operated valve assembly communicating with a source of vacuum and with a vacuum motor assembly operatively connected to a variably positionable throttle valve of the induction system; an electronic control sensitive to the speed of a monitored parameter is effective to controllably energize the solenoid valve assembly to in turn regulate the magnitude of vacuum directed thereby to the vacuum motor assembly and consequently govern the then permissible amount of opening of the throttle valve.

Abstract: A vehicle engine has a throttle stop positionable in response to an actuator command signal to determine engine idle speed. Apparatus is provided to generate a speed error signal having both an absolute value and a further characteristic indicative of high or low speed; and further apparatus is provided including a memory effective to store actuator command signals corresponding to specific speed error signals and speed correction apparatus effective to obtain an actuator command signal from the memory corresponding to each speed error signal and supply the actuator command signal to the throttle stop positioning apparatus to correct engine idle speed in the direction of a predetermined desired engine idle speed.

Abstract: An idling speed control system for automotive vehicle engines is disclosed. A throttle valve bypass passage for intake air is provided with an air control valve of the on-off type. The air control valve is electrically energized by a pulse train of substantially constant pulse repetition rate and pulse duration modulation so that the duty cycle of the valve is varied according to deviation of the engine idling speed from a set point value. The pulse repetition rate of the energizing pulses is higher than the frequency at which the engine can respond to air supply pulsations in the intake manifold.

Abstract: Automobile speed control to maintain actual automobile speed at a desired automobile speed, in which a superposed electrical analog signal formed by a first electrical signal indicating actual automobile speed and a feedback signal indicating fuel injection duration in an engine of an automobile is supplied to a comparator which compares it with a second electrical signal indicating desired automobile speed and memorized on a capacitor. The differential signal or error signal at the output of the comparator circuit is supplied to a servomotor which controls the position or opening of a throttle valve of the engine. The feedback signal is supplied from an injection time signal generator circuit which, in response to a fuel injection command signal from an electronic fuel injection control device associated with the engine, generates an electrical analog signal corresponding to fuel injection duration.