Nippondenso Co., Ltd.

Toyota Jidosha Kogyo Kabushiki Kaisha

Nippon Soken, Inc.

Masaaki Kurii

Tadashi Hattori

Masumi Kinugawa

Hideo Miyagi

Minoru Nishida

Yoshiki Ueno

Hisamitsu Yamazoe

Akinori Yamamoto

Kunio Makita

Masakuni Tsujimura

Mamoru Kohashi

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. A control circuit which constitutes a drive circuit to drive the motor and to which the pulse signal from the reed switch is supplied is installed in the circuit board. Due to this control circuit, the rotating state of the motor is controlled in response to an operation command, thereby allowing the antenna rod to be extended or retracted.

Motor driven extensible rod antenna for vehicles with position control

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.

Method and apparatus for controlling energizing interval of ignition

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.

Method and apparatus for controlling rotation speed of engine

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.

Ignition system for internal combustion engine

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Kasugai, Japan

Masaaki Kurii