Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Denki K.k.

Tadahiro Azuma

Hirofumi Ohuchi

Keiichi Enoki

Teruaki Kawakami

Hajime Kako

Hideaki Tani

Hiroyuki Kobayashi

Hideki Takubo

Toshiki Kuroda

Kuen Yehliu

Takeshi Kakigi

Keizo Hagihara

A control apparatus for an internal combustion engine can detect degradation of a three-way catalyst with high accuracy without causing deterioration in an exhaust. A pair of first and second air fuel ratio detectors are disposed in an exhaust system at locations upstream and downstream of the three-way catalyst for detecting a first and a second air fuel ratio of an exhaust gas. A target oxygen change amount calculator calculates a target oxygen change amount of the three-way catalyst, and an oxygen change amount calculator calculates an oxygen change amount of the three-way catalyst from an amount of exhaust gas passing through the three-way catalyst and the first air fuel ratio. An air fuel ratio operator inversely controls the air fuel ratio to a rich side and a lean side with a prescribed air fuel ratio width each time the oxygen change amount reaches a target oxygen change amount.

Control apparatus for an internal combustion engine

A control apparatus for an internal combustion engine can limit a vehicle speed within a permitted maximum speed with high accuracy by preventing a response delay of a throttle opening with respect to an amount of intake air while avoiding deterioration of driveability. The apparatus includes a target opening calculating section that calculates a target opening of an electronic throttle valve from an accelerator opening, and an electronic control section that drives the electronic throttle valve to make the throttle opening coincide with the target opening. The target opening calculating section includes a correction factor calculating section that calculates a correction factor for correcting the target opening. The correction factor calculating section sets arithmetic calculation gains of mutually different correction factors for ranges of different characteristics in accordance with characteristics between the throttle opening and the intake air amount, whereby the target opening is controlled to prevent the vehicle speed from exceeding the permitted maximum speed.

A cylinder disabling control apparatus for a multi-cylinder engine is provided which is capable of efficiently reducing the exhaust gas of the engine immediately after the starting thereof. The cylinder disabling control apparatus includes a variety of sensors ( , and ), a catalytic converter ( ) and a cylinder disabling control element ( ) for inhibiting or stopping fuel supplied to the at least one specific cylinder in accordance with the engine operating conditions. The variety of sensors includes a water temperature sensor ( ) for detecting a temperature of cooling water (WT). When the temperature (WT) upon starting of the engine is equal to or higher than a first predetermined temperature (WT ), the cylinder disabling control element ( ) performs cylinder disabling control on the at least one specific cylinder until a predetermined time has elapsed immediately after the starting of the engine ( ).

Cylinder disabling control apparatus for a multi-cylinder engine

An air-fuel ratio control device for an internal combustion engine is provided with: an air-fuel ratio sensor; an O sensor; a device for setting a reference air-fuel ratio target value; a device for setting a target value of an output value of the O sensor; a device for obtaining an air-fuel ratio target value correction value; a device for obtaining a forcible air-fuel ratio oscillation width target value; a device for computing an air-fuel ration target value; a device for computing a correction value; a device for obtaining a forcible air-fuel ratio oscillating width injector driving time correction value; and a device for setting injector driving time.

Air-fuel ratio control device for internal combustion engine

An apparatus for controlling starting of an internal combustion engine is arranged to reduce exhaust emissions and emission variations at engine startup. The starter is driven after a lapse of the predetermined period of time from the moment at which an engine starting command is operated, so that the engine can be started when sensors and actuators attached to the engine are in optimum conditions, thereby reducing exhaust emissions and emission variations. Also, after the engine has been cranked by driving the starter, the starter is stopped after a lapse of the predetermined time from the moment at which the number of engine revolutions becomes equal to or larger than a predetermined number of revolutions. Therefore the engine can be reliably set in a suitably started condition before the starter is turned off even if the engine is in a particular condition, e.g., an extremely-low-temperature condition such that combustion in the engine is unstable and the engine can stall easily.

Apparatus for controlling starting of internal combustion engine

Achieved is an air/fuel ratio control apparatus for an internal combustion engine where the purification ability of a three-way catalyst is brought back to an optimal state immediately after a fuel cut by expelling oxygen absorbed by the three-way catalyst due to the fuel cut without being affected by the oxygen absorption amount of the three-way catalyst before the fuel cut.

Air/fuel ratio control apparatus for an internal combustion engine

A device for controlling the rise of the catalyst temperature in an internal combustion engine, capable of quickly raising the catalyst temperature at the start to satisfy the exhaust gas regulations to a sufficient degree. The device comprises a means for picking up data corresponding to the temperature of the catalyst provided in the exhaust pipe of the internal combustion engine as catalyst temperature TC, a variety of sensors for detecting the operation conditions of the internal combustion engine, a means for controlling the air-to-fuel ratio of the internal combustion engine depending upon the operation conditions, and an air-to-fuel ratio lean-correction means S which, when the catalyst temperature is lower than a predetermined temperature corresponding to an activating temperature of the catalyst, corrects a target air-to-fuel ratio A/Fo toward the lean side to promote the activation of the catalyst, wherein the variety of sensors detect at least intake-air-amount data and crank angle data, and, when the temperature of the catalyst is lower than the predetermined temperature, the air-to-fuel ratio lean-correction means sets the target air-to-fuel ratio to a lean activating air-to-fuel ratio which is larger than an air-to-fuel ratio A/Fn of during the normally controlled operation and is higher than a stoichiometric air-to-fuel ratio.

Device for controlling the rise of the catalyst temperature in an internal combustion engine

The fuel injection control device includes a revolution detecting unit for detecting revolution of an internal combustion engine, an injector for injecting fuel into the internal combustion engine, and a fuel injection control unit for controlling the injection of fuel of the injector. The fuel injection control unit includes an engine-start-completion detecting unit for detecting whether or not the internal combustion engine has started, and a fuel-injection-amount correcting unit for correcting the amount of fuel to be injected, after the engine has started, by an amount of fuel for correction obtained by considering the amount of fuel remaining uncombusted when starting the engine and in accordance with one of the frequency of fuel injection, revolution of the internal combustion engine, and the elapse of time.

Fuel injection control device for internal combustion engine

In an internal combustion engine system, a fuel injection control apparatus for preventing fuel leakage with high reliability in the engine-stopped state. The apparatus includes various types of sensors ( ) for detecting operation states of an internal combustion engine ( ), a fuel pump ( ) and a fuel supply pipe ( ) for supplying a fuel from a fuel tank ( ) to the engine ( ), a fuel injector ( ) for injecting the fuel into the engine, an engine stoppage detecting means for detecting a stopped state of the engine ( ), a fuel temperature estimating means for estimating temperature of the fuel within the fuel supply pipe ( ), and a fuel pressure lowering means for lowering pressure of the fuel within the fuel supply pipe ( ). The fuel pressure lowering means is designed to lower pressure of the fuel within the fuel supply pipe ( ) after the stoppage of operation of the engine ( ) in dependence on an estimated fuel temperature determined by the fuel temperature estimating means.

Fuel injection control apparatus for internal combustion engine

To provide a fuel property judgement device for an internal combustion engine, in which, without increasing costs, fuel property is judged earlier and an optimum control suitable for the fuel property is carried out earlier whereby the predicted degradation of the controllability at the time of starting operation, caused by the difference in fuel property, immediately after the start and during a transient period may be prevented, there are provided a unit for detecting an initial combustion at the time of starting operation of the internal combustion engine, a unit for counting a turn-on number of a crank angle signal until the initial combustion is detected, a unit for setting a standard number, a unit for comparing the turn-on number with the standard number, and a unit for determining the fuel property on the basis of a comparison result.

Fuel property judgement device for internal combustion engine

A device for controlling the rise of the catalyst temperature in an internal combustion engine, capable of quickly raising the catalyst temperature at the start to satisfy the exhaust gas regulations to a sufficient degree. The device comprises a means for picking up data corresponding to the temperature of the catalyst provided in the exhaust pipe of the internal combustion engine as catalyst temperature TC, a variety of sensors for detecting the operation conditions of the internal combustion engine, a means for controlling the air-to-fuel ratio of the internal combustion engine depending upon the operation conditions, and an air-to-fuel ratio lean-correction means S,which, when the catalyst temperature is lower than a predetermined temperature corresponding to an activating temperature of the catalyst, corrects a target air-to-fuel ratio A/Fo toward the lean side to promote the activation of the catalyst, wherein the variety of sensors detect at least intake-air-amount data and crank angle data, and, when the temperature of the catalyst is lower than the predetermined temperature, the air-to-fuel ratio lean-correction means sets the target air-to-fuel ratio to a lean activating air-to-fuel ratio which is larger than an air-to-fuel ratio A/Fn of during the normally controlled operation and is higher than a stoichiometric air-to-fuel ratio.

A failure diagnosis device of a fuel evaporation preventive apparatus including: a fuel evaporation preventive apparatus having a canister having an atmospheric hole communicating with outside air and installed in the middle of a purge passage communicating a fuel tank with an intake pipe, for preventing evaporation of fuel by adsorbing at any time fuel gas generated in the fuel tank by an adsorber incorporated in the canister and pertinently introducing the adsorbed fuel gas into the intake pipe by controlling a purge control valve in accordance with a running state of an internal combustion engine; an initializing apparatus for controlling an inner pressure of the fuel tank to a predetermined initial pressure; a pressure controlling apparatus for changing the initial pressure to a predetermined target pressure and controlling a purge amount at that time to a constant flow rate by closing the atmospheric hole and driving the purge control valve; a hermetically enclosing apparatus for constituting a hermetically enclosed section in the fuel evaporation preventive apparatus by closing both the purge control valve and the atmospheric hole when the inner pressure of the fuel tank reaches the target pressure; a pressure detecting apparatus installed in the hermetically enclosed section; and a failure diagnosing apparatus for diagnosing failure of the fuel evaporation preventive apparatus based on a change of an inner pressure of the hermetically enclosed section.

Failure diagnosis device of fuel evaporation preventive apparatus

An air-fuel ratio control apparatus for an internal combustion engine includes an operative state detection unit for detecting an operative state of the internal combustion engine, a purge quantity calculation unit for calculating a quantity of purge air and a purge rate calculation unit for calculating a purge rate from the purge air quantity calculated by the purge quantity calculation unit and from the operative state detected by the operative state detection unit. A purge air concentration calculation unit calaulates a purge air concentration from the purge rate and the air-fuel ratio feedback correction coefficient. A purge air concentration correction unit calculates a purge air concentration correction coefficient based on the purge rate and the purge air concentration, and a fuel injection quantity calculation unit calculates an injection quantity of fuel, based on the air-fuel ratio feedback correction coefficient and the purge air concentration correction coefficient.

Air-fuel ratio control apparatus for an internal combustion engine

A device for controlling an ignition timing of an engine wherein a basic ignition timing map classified based on a revolution number and an intake quantity of the engine is provided in a main body of a control device and a target ignition timing of the engine is set based on the basic ignition timing map, said main body of a control device comprising: an idling state detecting means for detecting that the engine is in an idling state; and an ignition timing limiting means for comparing a basic ignition timing read from the basic ignition timing map with a predetermined limited ignition timing when the idling state detecting means detects the idling state and selecting the limited ignition timing as the target ignition timing when the basic ignition timing is retarded compared with the limited ignition timing.

Ignition timing controlling device for an engine

A fault diagnosis device and process for an exhaust gas recycle control unit of an engine, comprising a return pipe for returning the exhaust gas to an intake pipe, apparatus for opening and closing the return pipe and apparatus for detecting and storing engine operating conditions when the return pipe is opened and closed. The opening and closing apparatus is controlled so that the flow rate of the returned gas is gradually changed when the return pipe is closed from the open state or vice versa.

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Tokyo, Japan

Tadahiro Azuma