Abstract: There is provided an electric antenna apparatus which is mounted on a vehicle such as an automobile, and in which the rotation of a DC motor drives and rotates a pinion through a reducing mechanism, and a cable coupled to the base end portion of an antenna rod is coupled to this pinion so as to come into engagement therewith. The cable is driven in its longitudinal direction due to the pinion, rotated in response to the rotation of the motor, and the antenna rod coupled to this cable is driven, thereby allowing the antenna rod to be extended or retracted. In this case, a magnetic disk, formed with a plurality of magnetic poles in its outer peripheral portion, is mounted to a worm wheel constituting the reducing mechanism so that the magnetic disk is rotated coaxially with the worm wheel. Also, a reed switch is attached to a circuit board set adjacent to the motor, thereby allowing a pulse-like signal from the reed switch to be detected in response to the rotation of the magnetic disk.

Abstract: Energizing interval of an ignition coil, which is basically determined on the basis of the rotational speed of an engine, is corrected by adding thereto an extension amount which is either a function of the rotational speed of the engine or a given upper limit value at the rotational speed of the engine when accelerating condition is detected. Thus, the ignition coil is supplied with a primary winding current for a desired interval even during acceleration so that sufficient ignition voltage will be produced to properly ignite air/fuel mixture in engine cylinders. The extended energizing interval is then reduced stepwise to provide normal energizing interval during engine operations other than acceleration.

Abstract: A method and apparatus for controlling the rotation speed of an engine by the steps of calculating a desired value of the idling rotation speed of the engine, sensing the actual idling rotation speed of the engine, calculating the deviation of the sensed actual idling rotation speed from the desired value, calculating a data of a rotation speed control factor on the basis of the deviation, limiting the control factor to within a control range between an upper limit and a lower limit, storing a correction factor related to a value of the control factor used under a specific operating condition of the engine, calculating the upper limit and the lower limit of the control factor using the value of the correction factor, and controlling the amount of intake air or the amount of the air-fuel mixture supplied to the engine on the basis of the value of the control factor thus calculated.

Abstract: The angle through which the crankshaft of an engine rotates within any given time is proportional to the rotational speed of the engine. Consequently, where the ignition system is of the type in which the integrated value of an integrator circuit or the count value of a counter circuit is varied so as to control the spark advance, if the rate of increase or decrease of the integrated value or the count value within a portion of the increasing or decreasing time is made different from that within the remaining portion of the time, the integrated value or the count value is directly affected by the engine rotational speed. In other words, the spark advance is directly controlled by the factor of the engine rotational speed, thus ensuring satisfactory response characteristic and accuracy for the ignition system.

Abstract: In an engine automatic control system for a vehicle for automatically connecting an electric source in the form of a battery with an engine starter and an ignition circuit in response to disengaging operation of a clutch device of the vehicle, for maintaining the ignition circuit conductive while the vehicle runs, and for automatically making the ignition circuit non-conductive when the vehicle is arrested, the engine control system comprises a setting circuit interposed between an ignition switch and the ignition circuit for selectively setting the engine control system to its operative condition and a cancelling circuit coupled with the setting circuit for automatically cancelling the operative condition of the engine control system when the stored voltage of the battery is lowered to or below a predetermined low value.

Abstract: In an engine automatic control system for a vehicle for automatically connecting an electric source with an engine starter and an ignition circuit in response to disengaging operation of a clutch device of the vehicle, for maintaining the ignition circuit conductive while the vehicle runs, and for automatically making the ignition circuit non-conductive when the vehicle is arrested, the engine control system comprises a setting circuit interposed between an ignition switch and the ignition circuit for selectively setting the engine control system to its operative condition and a cancelling switch coupled with the setting circuit for automatically cancelling the operative condition of the engine control system when an operator leaves the vehicle.