Abstract: In a multiple cylinder four-stroke engine with fuel injection, an interference oscillation is generated briefly on the flywheel on starting by varied fuel supply to different cylinders. After oscillation analysis of the resultant oscillation of the flywheel, phase positions of the superimposed interference oscillation and of the resultant oscillation are compared. If predetermined phase positions of the oscillations appear, the engine is considered to be operating in the correct cycle position, but otherwise a control unit is initiated to correct its cycle position so that the correct cycle position of the engine is obtained.

Abstract: The invention provides a circuit for electronic control of an internal combustion engines including injection valves that can be activated electrically as a function of regulated variables such as crankshaft position, engine speed, exhaust-gas composition and engine torque. The circuit includes an electronic control unit with means to activate the intake valves, exhaust valves, injection valves and ignition device as a function of ignition duration and ignition timing. The control unit also includes a start-up program with which ignition sequences of the engine cylinders, intake valves, injection valves and ignition device can be activated for any desired cylinder position of an engine-start-up process. The circuit further includes a program memory, an engine-standstill detection circuit, and an absolute-value angle transmitter to which the engine-standstill detection circuit is responsive.

Abstract: For a combustion-powered tool, an ignition system is powered by a battery and is arranged so that a sudden discharge of a capacitor, as charged via an oscillator, produces a spark at a spark gap of a spark plug, so that the oscillator is enabled if a trigger switch is closed while a head switch is closed, but not if the trigger switch is closed while the head switch is opened, and if a battery voltage, as monitored, is not less than a reference voltage, and so that a silicon-controlled rectifier, which is arranged to produce a sudden discharge of the capacitor, is switched to a conductive state if the capacitor voltage, as monitored, and is not less than a reference voltage. The head and trigger switches, which are photoelectric, are polled intermittently to determine whether they are closed. Predominantly, solid-state components are used.

Abstract: An ignition control system for an internal combustion engine has an oscillator for generating a clock signal, ignition timing signal generator means for generating an ignition timing signal synchronized with the ignition timing of the engine, a defect detector for detecting the defect of the oscillator, a control circuit for calculating the energizing timing of an ignition coil from the ignition timing signal when the oscillator is normal, and a switching circuit for disconnecting the output of the control circuit when the oscillator is defective to lead the ignition timing signal to an igniter, thereby switching the switching circuit to the output side of the control circuit by the output of the defect detector when the oscillator is normal to calculate the energizing timing of the ignition coil by the control circuit from the ignition timing signal to lead it to the igniter, and thereby switching the switching circuit by the defect detector when the oscillator is defective to lead the ignition timing signal

Abstract: In an ignition control system for the internal combustion engine, a reference angle sensor detects the rotational speed of the internal combustion engine, and detects a point near the top dead center, and generates a reference angle signal. An angle sensor similarly detects the rotational speed of the internal combustion engine, and discriminats the rotational speed for each predetermined angle, and generates an angle signal. A microcomputer includes an output compare register, a free-running counter and a timer control status register, and computes the ignition timing and energization time of the ignition coil in response to a reference angle signal from the reference angle sensor and an angle signal from the angle sensor.

Abstract: A breakerless ignition system includes a resonant circuit whose oscillation is controlled by the relative position between a detector coil 2a embodied therein and a magnetically permeable rotor 1 driven by the engine, and a threshold detector 3 responsive to the oscillation signal envelope for controlling the supply of energy to an ignition coil 6 via a power switching transistor 5. To prevent false triggering of the detector due to spurious signals induced in the coil by the spark ignition firings, a monostable multivibrator 8 actuated by the trailing edge of the detector output holds the transistor deenergized for a predetermined period of time after it has been turned off. The multivibrator output may resistively ground the resonant circuit, or it may disable the transistor via an inverter 11 and AND gate 12.

Abstract: An ignition system includes a signal generator unit 1 comprising a sensor core/coil, and an electronic circuit unit 2 including various components mounted on a substrate board. Both units are accommodated within a unitary casing comprising a frame 5 and a heat sink 10 on which the board is mounted. The casing has an open end or face in which the core is mounted in proximity to an engine driven rotor. The interconnecting leads between the coil and substrate board include terminal plates 6 and short straps 7 to avoid spurious high frequency radiations and induced signals.

Abstract: A breakerless ignition system includes a resonant circuit whose oscillation is controlled by the relative position between a detector coil 2a embodied therein and a magnetically permeable rotor 1 driven by the engine, and a threshold detector 3 responsive to the oscillation signal envelope for controlling the supply of energy to an ignition coil 6 via a power switching transistor 5. To prevent false triggering of the detector due to spurious signals induced in the coil by the spark ignition firings, a monostable multivibrator 8 actuated by the trailing edge of the detector output holds the transistor deenergized for a predetermined period of time after it has been turned off. The multivibrator output may resistively ground the resonant circuit, or it may disable the transistor via an inverter 11 and AND gate 12.

Abstract: A circuit for selecting between two or more detecting elements, such as magnetic pickups or resonant sensors (10, 12, 14) or (132, 134) spaced around a rotating member (15a, 157) to generate timing signals for an ignition system for an engine (15, 156) is disclosed. One disclosed embodiment is usable with a conventional mechanical advance to provide an additional advance above a predetermined vehicle (102) speed, and which may be negated by a vacuum switch (119) if the engine (156) is under heavy load. Another disclosed embodiment utilizes a plurality of such sensors (10, 12, 14) to provide a step-type ignition advance for an engine (15).