Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Denki K.k.

Mitusbishi Denki Kabushiki Kaisha

Mitsubishi Denki Kabushiki Kiasha

Mitsuru Koiwa

Masaaki Taruya

Shigemi Murata

Koichi Okamura

Yutaka Ohashi

Nobuyuki Sawazaki

Yasuhiro Takahashi

Hisanori Nobe

Shingo Morita

Yasuyoshi Hatazawa

Takeshi Shimizu

Toshio Maekawa

Kimihiko Tanaya

Tsutomu Morishita

Takafumi Narishige

Shu Sasaki

Masahiro Yokotani

Yusuke Naruse

Kazuya Hamada

Toshio Uchida

Kouichi Okamura

Toshiyuki Hino

Koji Waki

Kenji Matsushita

An ignition apparatus for an internal combustion engine can be reduced in size and cost. A plurality of closed magnetic circuit cores () are built in a casing () and each have an excitation portion () and non-excitation portions (). A plurality of coil parts () each includes a primary coil () and a secondary coil () which are arranged to surround the excitation parts () of a corresponding one of the closed magnetic cores (). The closed magnetic circuit cores () are arranged along an axial direction (A) of the coil parts () such that adjacent ones of the non-excitation portions (), which are those sides of adjacent cores () each of which extends from one end of a corresponding excitation portion (), overlap each other at least partially in the axial direction (A).

Ignition apparatus for internal combustion engine

An ignition apparatus for an internal combustion engine is capable of avoiding mis-ignition even if subject to external disturbances when a fail signal is transmitted through a common signal line on which an ignition signal can also be transmitted. An igniter is connected to receive the ignition signal from an ECU, and includes a waveform shaper connected with the signal line and having an input connected in parallel to an input resistance so as to make a voltage at the input higher than a prescribed voltage when the ignition signal flows into the input resistance, and a pulse output circuit connected to the input and having an output for generating the fail signal into which a secondary coil current is converted. The pulse output circuit adjusts a fail signal current such that the voltage at the input when the fail signal flows into the input resistance becomes less than the prescribed voltage.

Ignition apparatus for an internal combustion engine

A misfire detection apparatus of an internal combustion engine for detecting combustion or a misfire of an air fuel mixture in the internal combustion engine based on an ion current generated at the combustion time of the air fuel mixture. The misfire detection apparatus includes ion current detection means and misfire determination means. The ion current detection means detects the ion current responsive to the amount of ions occurring in a cylinder just after combustion of the air fuel mixture in the cylinder in the internal combustion engine. The misfire determination means calculates a predetermined function based on the ion current detection value and determines that the condition is combustion when the magnitude exceeds a threshold value.

Misfire detection apparatus of internal combustion engine

An ignition apparatus for an internal combustion engine can increase the degree of freedom of wiring paths of electroconductive wires as well as simplifying and miniaturizing a wiring module. Transformers (A,B,C) are built into a casing () and each includes a core (), a primary coil () and a secondary coil () arranged to surround the core for generating a high voltage in the secondary coil (). A wiring module () built into the casing electrically connects the transformers and the switching module with one another. An insulating resin portion () fixedly attaches the transformers, the switching module and the wiring module to the casing. The wiring module () includes a module main body (), which is formed by integrating a plurality of conductors () with one another through a resin, and flexible electroconductive wires () disposed along a surface of the module main body ().

Ignition apparatus for an internal combustion engine and a manufacturing method therefor

Ion current detection signal output section for outputting an ion current detection signal including a failure determination signal of an ignition operation is provided, and a failure determination as well as a combustion state can be performed based on this ion current detection signal.

Combustion state detection and failure determination apparatus of an internal combustion engine

An ignition coil for an internal combustion engine with a compact height and width includes an actuated magnetic portion of an iron core around which a primary coil is wound having an axis line crossing an ignition plug axis line of the internal combustion engine at a right angle; and a switching unit which is disposed at an end of the actuated magnetic portion vertically to the axis line of the actuated magnetic portion and intercepts a primary current flowing through the primary coil. This ignition coil can be manufactured at a greatly reduced cost, compared to the conventional ignition coil in which only one of the height or width is made compact, by reducing the required size of the press mold for the case and by reducing the initial investment for the equipment.

Ignition coil for internal combustion engine

A combustion state detection apparatus for an internal combustion engine has a detection period limit section, which limits a detection period of an ion current processed in misfire detection section or knock detection section.

Combustion state detection apparatus for internal combustion engine

To obtain a knock control apparatus for internal-combustion engine having a function of judging whether or not the causes for failure have been solved for returning to normal knock control at the time of the solution, and capable of easily judging failure even in a failure mode in which it is difficult to raise the filter value and it is difficult to judge the failure. A fail control means includes: a failure judgment unit for judging failure for each cylinder based on output from a background level setting unit and a knock suppression and control unit ; number of fail cylinders judgment unit for judging the number of fail cylinders based on output from the failure judgment unit ; a retard angle changing unit for changing at least the real retard angle of a fail cylinder based on output from the knock suppression and control unit , the failure judgment unit and the number of fail cylinders judgment unit ; and a normal judgment returning unit for returning to normal ignition timing retard when a cylinder under judgment for failure meets normal judgment requirements based on the output from the background level setting unit and the retard angle changing unit

Knock control apparatus for internal-combustion engine

A knock control apparatus for an internal combustion engine includes a knock detector for extracting a vibration component superposed on an ion current, and waveform shaping it at a predetermined threshold value to generate a train of knock pulses (Kp) of which the number of pulses indicates a knock intensity of a knock generated in the internal combustion engine, and an engine control unit for counting the number of knock pulses (npn) in the knock pulse train (Kp) output from the knock detector. The engine control unit judges, based on the number of knock pulses (npn), whether or not a knock is occurring. The engine control unit performs a peak hold of the number of knock pulses to calculate the knock judgement threshold value (BGL) by multiplying the number of pulses by (&agr;). Thus, precision in knock judgement is improved by performing knock judgement based on a maximum value (MAX) of the number of knock pulses (npn).

Knock control apparatus for internal combustion engine

A misfire detecting apparatus for an internal combustion engine detects only an ion current due to combustion of an air/fuel mixture regardless of a leakage current when combustion: takes place normally. The apparatus includes circuitry for detecting an ion current generated within the engine cylinder immediately after combustion, circuitry for detecting a leakage current occurring between electrodes of a spark plug , a first waveform shaper for shaping the ion current into a pulse signal indicating a combustion or misfire event by comparing the pulse signal with a first threshold value for deciding the ion current, the first threshold value being set on the basis of a level of the ion current upon rising thereof, the ion current being superposed on the leakage current, a second waveform shaper for shaping the ion current as detected into a pulse signal through comparison with a second fixed threshold value which is fixed at a value smaller than the first threshold value, and a selector for selectively outputting as the combustion pulse signal either a shaped pulse signal outputted from the first waveform shaper upon detection of occurrence of the leakage current or a shaped pulse signal outputted from the second waveform shaper when no leakage current is detected.

Misfire detecting apparatus for internal combustion engine

To obtain a knock detection apparatus which may obtain a good knock pulse S/N even if an ionic current generation amount is changed by the change of a kind of fuel or plugs, a knock detection apparatus for detecting a knock generated, in an internal combustion engine, in which a vibratory component superimposed on an ionic current generated by combustion of fuel is extracted, the component that is equal to or more than a knock detection threshold value is shaped in waveform into a pulse waveform, a knock strength is calculated through counting and calculation process of the number of pulses of the pulse waveform by an engine controlling unit, an ignition timing is controlled on the basis of the knock strength, comprises a knock detection threshold value adjusting unit for changing the knock detection threshold value on the basis of information of an ionic current.

Knock detection apparatus

A device for detecting the knocking of an internal combustion engine, which maintains the background level at an optimum value irrespective of the knocking level, and features improved reliability by preventing the erroneous detection of noise or knocking when the knocking level is shifted. The device includes a counter for operating signals N of the knocking level from the ionic current, an averaging circuit A for operating an average knocking level AVE, a circuit A for operating a background level BGLA by using an offset value, a comparator for judging the knocking by comparing the signals of the knocking level with the background level, a circuit for judging the average knocking level that lies in a predetermined region, and a circuit for correcting the offset value depending on the result of judging the predetermined region, wherein the offset value is corrected toward a direction to cancel the increment or the decrement of the average knocking level depending on the predetermined region.

Device for detecting the knocking of an internal combustion engine

A combustion state detecting apparatus for an internal combustion engine which can ensure adequate thermal insulation between a transformer and a bias circuit and which can be manufactured in a miniaturized structure. The apparatus includes a transformer ( ) having a primary winding ( ) and a secondary winding ( ) which are so electromagnetically coupled mutually that upon interruption of a current flowing through the primary winding, a high voltage is induced at a high-potential end of the secondary winding, a switch ( ) for controllably interrupting the current flowing through the primary winding, a spark plug ( ) for generating a spark discharge in response to application of the high voltage at the high-potential end of the secondary winding, a bias circuit ( ) for applying to a low-potential end of the secondary winding a voltage of plus polarity for detecting ions produced when the spark discharge occurs at the spark plug, and an outer packaging case ( ) for accommodating therein the transformer, the switch and the bias circuit, wherein the bias circuit is disposed within the outer packaging case at a location adjacent to the switch remote from the transformer, and wherein the outer packaging case is filled with a moldable resin ( ).

Combustion state detecting apparatus for internal combustion engine

To provide a high tension connection portion structure for an ignition device for an internal combustion engine, which may prevent an instantaneous breakdown of the connection even if an external force is applied to a high tension connection portion, may enhance a connection property of the high tension connection portion by suppressing a sliding movement between metal terminals of the connection portion and may be applied to the path of a minute current such as an ionic current or the like, a connecting structure of a high tension connection portion used in an ignition device for an internal combustion engine, includes: a first high tension connection terminal ; a second high tension connection terminal for electrically connecting with the first high tension connection terminal ; a locking mechanism provided between the first high tension connection terminal and the second high tension connection terminal for restricting the separation therebetween in the axial direction; and a spring member disposed between the first high tension connection terminal and the second high tension connection terminal

High tension connection portion structure of an ingition device for an internal combustion engine

To provide a combustion condition detecting apparatus for an internal combustion engine, which may well detect the combustion conditions such as discrimination of a combustion cylinder and knock generating condition and may reduce a circuit scale therefor, there are provided an ignition coil provided for each cylinder; an ignition plug for discharging by the application of the ignition high tension voltage to ignite mixture within the cylinder; a bias circuit provided for each cylinder for applying a bias voltage to the ignition plug ; an ionic current detection circuit provided for each cylinder for detecting as an ionic current detection signal an ionic current generated in the cylinder that is immediately after the combustion of the mixture; a knock signal processing circuit provided one for a combination of a plurality of cylinders that are every two or more cylinders in ignition order on the basis of a sum of the ionic current detection signals; and an ECU for detecting the combustion condition of the ignition plug on the basis of the knock signal.

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Tokyo, Japan

Mitsuru Koiwa