An apparatus for electrically controlling the spark advance of selected cylinders of a multicylinder engine so that the spark of the selected cylinders is advanced beyond others of the cylinders. For example, the selected cylinders may be advanced beyond normal operational advance to increase combustion chamber temperatures and pressures for a relatively short period so as to clean the surfaces of the combustion chamber. The cylinders which are advanced are changed in sequence or at random so that all of the cylinders are cleaned. The system may also be used to control the spark advance of the cylinders to provide differing advances for the respective cylinders to accommodate differences in operational conditions at the cylinders.

Internal combustion engine ignition system

An ignition system of electronic distribution type for an internal combustion engine with which merits of sharing circuits and elements can be expected with satisfactory result, in which wires of a GND line will not be disconnected by fusion even under a condition of abnormal power supply, and in which the engine will not be stalled even in a mode of simultaneously igniting two cylinders, thus enabling the limp-form traveling and made start-up with simultaneous ignition of two cylinders. To this end, power transistors 20 through 25 for power supply control and feedback control circuits 30 through 35 for limiting currents are respectively provided to control ignition coils 4 through 9 in one-to-one relation. A total of two systems of resistance devices 17a, 17b for detecting currents are provided with each resistance device operating a respective group of three cylinders. The feedback control circuits and the resistance devices for detecting currents are formed on a thick-film circuit board 60. Wires 50a, 50b used for connection between a GND portion on the thickfilm circuit board and an external GND terminal 50 are provided in the same number, i.e., two, as the number of resistance devices. The sequence of power distribution to the cylinders is determined, taking into account the fact that the resistance devices for detecting currents are each allocated to a respective group of three cylinders.

Ignition system for internal combustion engine

In a pulse width control circuit, particularly in an electronic ignition system for an automobile engine, the timing and width of output pulses, e.g. ignition current pulses, Is controlled by comparing a signal responsive to input pulses, e.g. pulses synchronized with the engine's rotation, with a comparison level. According to the invention said comparison level is automatically varied in response to an operating temperature, e.g. the engine temperature, thereby ensuring uniform production of output pulses without pulse gaps in both the low-speed/low-temperature and high speed/high-temperature ranges of the engine.

Pulse width control circuit in which a feedback amount is vaired depending upon an operating temperature

This invention relates to a method for preventing premature ignition in an ignition device for the internal combustion engine including a non-contact type ignition circuit for the internal combustion engine, particularly an ignition circuit for the internal combustion engine in which an inductive current in the form of an AC waveform induced in a primary winding of an ignition coil is controlled in its conduction and cut-off by means of a transistor circuit, various auxiliary circuits to be disposed for a desired performance in accordance with the purpose of use and the rate of this circuit, and an ignition circuit for the internal combustion engine in accordance with the present invention, and more particularly to a method for preventing premature ignition in an ignition device for the internal combustion engine comprising a transistor circuit for controlling in conduction and cut-off of a primary short-circuit current in the whole circuit and a trigger circuit for controlling the trigger in said transistor circuit, in which auxiliary circuits are added to said trigger circuit or said transistor circuit in accordance with the purpose of use and requirements of the circuit to attain a desired performance, and disadvantages inherent in the inductive discharge type ignition circuit for the internal combustion engine in the art of the present invention are eliminated.

Ignition circuit for the internal combustion engine and premature ignition prevention method in the ignition device

An ignition system for internal combustion engines comprises an electronic circuit arrangement which under variable operating conditions, such as high and low speeds of the engine, high and low supply voltages, supplies a desired energy to the ignition coil so as to produce ignition sparks having, for example, a constant energy. For this purpose, the ignition coil is connected via a semiconductor switch to the supply source for a given time. The pulse duration is determined by the time constant of an RC network and by the voltage of the supply source and, as the case may be, by the ambient temperature.

Ignition system for internal combustion engines

An ignition system has a transistor connected in series with a primary winding of a conventional spark coil, and a sensing resistor is also connected in series with the transistor A silicon-controlled rectifier has the anode thereof connected to the base electrode of the transistor and the cathode thereof coupled to the emitter of the transistor effectively to be in parallel with the base-emitter junction The gate electrode of the silicon-controlled rectifier is coupled to the sensing resistor to be rendered conductive in response to a predetermined voltage level developed at the sensing resistor The siliconcontrolled rectifier, when conductive, decreases the current flow through the transistor and the primary winding of the spark coil and, when nonconductive, increases the current flow through the transistor and the primary winding of the spark coil

Gunther Schuette

Papers

Transistor ignition system with ballast compensation