Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Mitsubishi Denki Kabushiki Kaisha

Mikuni Corporation

Tokyo Roki Corporation

Mitsuhiro Miyake

Toru Hashimoto

Takuya Matsumoto

Yasuhisa Yoshida

Hitoshi Kamura

Toshiro Nomura

Akira Takahashi

Hidetsugu Kanao

Seiichi Inoue

Minoru Nishida

Hideaki Katashiba

Hiroyuki Nakajima

Koichi Namiki

Masashi Chino

Mitsuhiko Yanagisawa

Katsutoshi Usuki

Shigekazu Yamauchi

Masakazu Kinoshita

Hideo Kakinuma

Satoshi Kasai

Kiyoshi Shinjyo

Shigeyuki Ishiguro

Hisakazu Miya

Naruo Tsukakoshi

Naoto Nishimoto

Susumu Nishio

Tohru Hashimoto

In an internal combustion engine equipped with an electronic throttle control device for electrically driving a throttle valve, a control apparatus includes failure detecting means for detecting a failure of the electronic throttle control device, and control means for limiting fuel supply to the engine when the failure detecting means detects a failure of the electronic throttle control device, if the rotating speed of the engine becomes equal to or higher than a predetermined value.

Control apparatus of internal combustion engine equipped with electronic

A control apparatus for an internal combustion engine is applied to vehicles equipped with a so-called drive by wire. When one of several control systems within the control apparatus fails, the drive is urged to obtain repairs. Also, even when all of the several control systems of the drive by wire fail and the failures of these control systems cannot be detected, unpredictable motion of the throttle valve can be prevented, thereby enhancing vehicle safety. The present invention includes a plurality of electronic throttle control systems for electrically driving a throttle valve of an internal combustion engine, a failure detecting mechanism for detecting failures of the electronic throttle control systems, intake air volume control mechanism for driving the throttle valve in a closing direction and also supplying a predetermined intake air volume to the internal combustion engine if it is judged that all electronic throttle control systems have failed, and output suppression mechanism for controlling the driving of the throttle valve by a normal electronic throttle control system and also suppressing output of the internal combustion engine corresponding to the operational quantity of the accelerator pedal if the failure determining mechanism determines that one electronic throttle control system among the several electronic throttle control systems has failed.

Control apparatus for an internal combustion engine

A throttle valve control device is provided which includes a throttle valve mounted in an intake pipe of an internal combustion engine, an actuator which drives the throttle valve so as to change an opening of the throttle valve, an operating condition sensor which detects operating conditions of the internal combustion engine, an accelerator sensor which detects an accelerator pedal position that represents an amount by which an accelerator pedal is depressed by a driver, and a control unit for controlling the throttle valve. The control unit includes a first setting circuit that sets a first target opening of the throttle valve based on the accelerator pedal position detected by the accelerator sensor, a second setting circuit that sets a second target opening of the throttle valve based on the accelerator pedal position detected by the accelerator sensor, and the operating conditions of the engine detected by the operating condition sensor, and a control circuit that compares the first target opening with the second target opening, and controls the actuator based on the larger one of the first target opening and second target opening.

Throttle valve control device and control method thereof

The present invention relates to a control apparatus for a vehicle equipped with an electronic throttle control unit (drive by wire) as electronic throttle control means and an automatic transmission, and the object of the invention is to provide a control apparatus for a vehicle which is capable of ensuring stable travel even in the case where a throttle valve is stuck by a failure of an electronic throttle control unit. In a control apparatus for a vehicle equipped with electronic throttle control means for electrically driving a throttle valve by drive means and an automatic transmission having a plurality of speed change gear stages, the control apparatus is provided with sticking judgment means for judging whether or not the throttle valve has been stuck, and speed change regulation means for inhibiting use of a predetermined gear stage among the speed change gear stages of the automatic transmission in the case where the throttle valve is judged to have been stuck by the sticking judgment means.

Control apparatus for a vehicle

Suction control device for multiple cylinder internal combustion engine

Method for detecting misfire by fluctuation in crankshaft rotation

A fault diagnosis apparatus for a fuel evaporative emission suppressing system has an electronic control unit which inputs an average value of integral terms for air-fuel ratio feedback control, engine speed, etc. when diagnosis executing conditions are satisfied, and then starts opening operation of a purge control valve. Subsequently, the average value of integral terms, engine speed, etc. are input again. If no substantial change occurs in the average value, etc. with driving of the purge control valve, it is concluded that purge air for fault diagnosis has not been introduced, and that the suppressing system is faulty. In driving the purge control valve, its driving duty ratio is increased by a relatively small increment till the driving duty ratio reaches a predetermined duty ratio. If the system is normal, therefore, a purge-air introduction amount for fault diagnosis is increased by a relatively small increasing degree, to thereby prevent fluctuation of the air-fuel ratio or engine output torque attributable to the purge air introduction. After the driving duty ratio has reached the predetermined duty ratio, the driving duty ratio is increased by a relatively large increment, to thereby rapidly execute the purge-air introduction and fault diagnosis.

Fault diagnosis apparatus for a fuel evaporative emission suppressing

A method and apparatus for detecting faults in a fuel evaporative emission control system, in which the fuel evaporative emission which is admitted from a fuel tank and adsorbed once by a canister is separated from the canister by purge air and sucked into a suction passage of an engine. The fault diagnostic apparatus fluid-tightly closes the fuel tank such that a vacuum is held in the fuel tank, and then detect the presence of a leak in a fuel evaporative emission flow path on the basis of a rate of increase of the pressure in the fuel tank. At the same time, the average value of the pressure in the fuel tank is calculated at regular intervals, and the calculated average value is compared with levels of the pressure in the tank detected within a predetermined period of time, so that the detection of the leak is interrupted depending upon the result of the comparison.

Fault diagnostic method and apparatus for fuel evaporative emission

A detecting apparatus for a catalytic converter has a pair of O.sub.2 sensors, arranged individually on the up- and downstream sides of the converter, and an electronic control unit for discriminating reduction of the purifying capacity of a three-way catalyst in the converter. This unit discriminates the reduction of the purifying capacity in accordance with the comparison between a decision value and the ratio between the respective frequencies of outputs from the O.sub.2 sensors. In the case where the O.sub.2 sensor on the upstream side is subject to thermal degradation, its decision value is corrected, or the decision itself is interrupted.

Apparatus for detecting reduction of purifying capacity of catalyst for

A deterioration diagnostic apparatus for a three-way catalyst includes an electronic control unit, which obtains a frequency of reversals of the changing direction in which the output of an upstream-side O.sub.2 sensor changes, based on the number of times the output voltage of the O.sub.2 sensor crosses a threshold. Also, the control unit obtains a frequency of reversals of the changing direction in which the output of a downstream-side O.sub.2 sensor changes, based on the number of times the output voltage of the downstream-side O.sub.2 sensor crosses upper and lower reversal reference values which are obtained by adding and subtracting a hysteresis constant to and from an average value of input values of the downstream-side O.sub.2 sensor output voltage. The control unit further obtains the ratio of the reversal frequency of the downstream-side sensor output to the reversal frequency of the upstream-side sensor output, and diagnoses deterioration of the three-way catalyst when the reversal frequency ratio has become greater than a predetermined value.

Apparatus for deterioration diagnosis of an exhaust purifying catalyst

A system for the diagnosis of an idling speed control system has a first timer for measuring the time elapsed since entrance to a feedback control mode, an engine speed state detection unit for detecting whether the engine speed has fallen within a predetermined speed range, a second timer for measuring the time elapsed since the engine speed has been detected to fall within the speed range, and a normality determining unit for determining that the idling speed control system is in order, when the time measured by the first timer is within a first preset time and also the engine speed is detected to have fallen within the speed range and has remained in the speed range until the time measured by said second timer reaches a second preset time. By adopting such a diagnosis method that instead of instantaneously determining an idling speed control system as being in order even after the engine speed has once fallen within a speed range to which the engine is intended to be controlled, any subsequent potential disorder of the idling speed control system is also taken into consideration. This has made it possible to obtain high-reliability information, for example, even when information for the diagnosis of a fault of the idling speed is collected on board.

Method and system for the diagnosis of idling speed control system

Fault diagnosis apparatus for a fuel evaporative emission supressing

A fault diagnosis apparatus for detecting a fault in a fuel evaporative emission suppressing system comprises an electronic control unit. When fault diagnosis execution conditions are fulfilled, the electronic control unit stores an average of integral term values for air-fuel ratio feedback control, operating position of an idling speed control valve, and engine speed, and then actuates a purge control valve of the suppressing system so that the valve opens. In a predetermined time period after the actuation of the purge control valve, the integral term average and the like are stored again. If any changes of the integral term average and other values caused by the actuation of the purge control valve are detected, the suppressing system is concluded to be normal. If no changes are detected, on the other hand, the suppressing system is concluded to be faulty.

An apparatus for determining a failure of an exhaust gas recirculation (EGR) apparatus includes an electronic control unit. When judging the fulfillment of the failure diagnosis executing condition, the electronic control unit stores the intake pressure detected by a pressure sensor, and then introduces part of the exhaust gas from an engine to an intake passage via an EGR passage to start the EGR for failure diagnosis. Thereafter, the intake pressure is detected again. If a significant change in intake pressure does not occur before and after the execution of the EGR for failure diagnosis, it is judged that the EGR apparatus is faulty. If the failure diagnosis executing condition becomes unfulfilled during the execution of failure diagnosis, the EGR for failure diagnosis is stopped, and the failure diagnosis entailing EGR is prohibited from the time when the EGR for failure diagnosis is stopped until a predetermined period of time has elapsed, by which the deterioration in riding quality and drivability of the vehicle is prevented.

Apparatus and method for determining a failure of an EGR apparatus

Misfire detection method based on a change in crankshaft rotation

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Kyoto, Japan

Mitsuhiro Miyake