Mitsubishi Denki Kabushiki Kaisha

Kabushiki Kaisha Kinki

Mitsubishi Electronic Corporation

Shinya Fujimoto

Hirofumi Ohuchi

Norio Matsumoto

Naoya Wada

Hiroaki Kajiyama

Junichi Asakura

Mitsuhiro Aota

Masuyuki Mieda

Mamoru Saitoh

In an operation control method capable of securely reducing required motor capacity and power consumption, a threshold based on load size is preset, and after a driven or rotated state of each of two rotating shafts becomes steady, and if the load size is smaller than the threshold, conveyance of a rotating drive to one of the two rotating shafts is stopped and the one of the two rotating shafts with the conveyance of the rotating drive stopped is interlocked and rotated together with the other of the two rotating shafts by vibration generated by a rotating drive of the other of the two rotating shafts, and if the load size becomes larger than the threshold, the conveyance of the rotating drive to the one of the two rotating shafts with the conveyance of the rotating drive stopped is started so as to drive or rotate the two rotating shafts.

Method of controlling the operation of vibration screen

In a vibratory sieving machine having two rotary shafts provided with eccentric spindles disposed parallel to each other, motors are disposed so as to reduce the capacity or power consumption of the motors required in the vibratory sieving machine, and to drive the two rotary shafts independently, and a rotary drive control mechanism is configured such that either one of the two rotary shafts can be started upon a start, while the other of the two rotary shafts can be started after a rotary drive state of the one of the two rotary shafts is transferred to a stationary state.

Vibratory sieving machine

In a system that executes air fuel ratio feedback control based on air fuel ratio signals of a pair of air fuel ratio sensors arranged at locations upstream and downstream of a catalyst of an internal combustion engine, an abnormality diagnosis apparatus can diagnose abnormality in a fuel system of the internal combustion engine in an accurate manner by using a signal of the air fuel ratio sensor downstream of the catalyst. A control unit in the form of an ECU () includes a feedback operation state determination section (), an oxygen storage saturation determination section (), an averaging start determination section (), an averaging section (), and an abnormality determination section (). An abnormality in the fuel system of the internal combustion engine is determined by using a second air fuel ratio signal (V) output from the second air fuel ratio sensor downstream of the catalyst only when the amount of oxygen storage in the catalyst is saturated.

Abnormality diagnosis apparatus for internal combustion engine

An abnormality detection apparatus of an engine temperature adjusting thermostat is provided which is capable of accurately grasping the state of an amount of heat generated by an engine to prevent misdetection of abnormality in the thermostat for improved reliabilty. The abnormality detection apparatus includes a heat amount parameter detection section for detecting an operating condition related to an amount of heat generated by the engine as a heat amount parameter (EQ), an abnormality determination section for comparing the temperature of cooling water with a predetermined allowable lower limit to determine abnormality of the thermostat when the heat amount parameter (EQ) reaches a reference heat amount (EQo), a small heat amount determination section for determining whether the amount of heat generated by the engine is in a small amount state, a large heat amount determination section for determining whether the amount of heat generated by the engine is in a large amount state, and an abnormality determination prohibition section for disabling the abnormality determination section when at least one of the small amount state and the large amount state of the amount of heat is determined.

Abnormality detection apparatus of engine temperature adjusting thermostat

When detection of malfunction is interrupted for any reason, the integrated purge amount is cleared, and the next malfunction judgment conditions are determined satisfied when said integrated purge amount is not less than a second predetermined value shorter than said first predetermined value. The detection of malfunction is carried out again by purging the canister taking a time shorter than conventionally required. As a result, a fuel gas purge system having failure diagnostic function and being capable of improving frequency in detection of malfunction and preventing deterioration in drivability and emission is obtained.

Fuel gas purge system having failure diagnostic function in internal combustion engine

The abnormality diagnosis apparatus includes an oxygen sensor for detecting a concentration of oxygen in exhaust gases of an internal combustion engine, an injector for injecting fuel into the internal combustion engine, a feedback control element for driving the injector according to the concentration of oxygen to control an amount of fuel supplied to the internal combustion engine in a feedback manner, a forced fuel correction element for correcting an amount of fuel controlled by the feedback control element in a forced manner, and an abnormality determination element for determining the presence or absence of abnormality in the injector. The abnormality determination element determines the presence or absence of abnormality in the injector based on the concentration of oxygen detected by the oxygen sensor in the course of a forced fuel correction control operation carried out by the forced fuel correction element.

Abnormality diagnosis apparatus of internal combustion engine

An abnormality detecting apparatus for a fuel evaporative emission control system which ensures enhanced reliability includes a canister ( ) disposed in a purge passage, a purge control valve ( ), a control means ( ) for controlling opening/closing of the purge control valve ( ) in dependence on engine operation states, a means ( ) for detecting an intake pressure (Pb), a means for detecting at least one of an atmospheric pressure (PA), an outside air temperature (TG), an intake air temperature (TA) and a fuel temperature (TT), a means ( ) for detecting a fuel tank pressure (Pt), a means ( ) for determining validity of abnormality decision enabling conditions in the case where concentration of fuel gas is lower than a reference value for comparison, a means ( ) for regulating a purge rate in dependence on an intake pressure (Pb) when the abnormality decision enabling conditions are valid, a means ( ) for detecting occurrence of abnormality in the fuel evaporative emission control system on the basis of the fuel tank pressure (Pt) when the abnormality decision enabling conditions are valid, and a condition validation limiting means ( ) for correcting the comparison reference value in dependence on at least one of the atmospheric pressure (PA), the fuel temperature (TT), the outside air temperature (TG) and the intake air temperature (TA).

Abnormality detecting apparatus for fuel evaporative emission control system of internal combustion engine

A dual-sensor type air-fuel ratio control system for an internal combustion engine. A catalytic converter 10 is disposed in an exhaust pipe 9, together with a first upstream air-fuel ratio sensor 11 and a second, downstream air-fuel ratio sensor 12. An electronic unit 30A controls the air-fuel ratio of a mixture supplied to the engine, and includes first and second arithmetic circuits 51, 52 for determining first and second air-fuel ratio control quantities Cf1, C2' on the basis of the first and second air-fuel ratio signals V1, V2, and a circuit 53, 54 for correcting the first control quantity with the second one to determine a target air-fuel ratio control quantity J for the fuel injection. A filter 50 is provided for the first air-fuel ratio signal to compensate for variations in the output characteristic of the first sensor.

Dual-sensor type air-fuel ratio control system for internal combustion

A deterioration detecting apparatus for catalytic converter is provided to surely detect deterioration of a catalytic converter. In the deterioration detecting apparatus for catalytic converter, an electronic control unit decides whether or not a catalyst is activated in the catalytic converter for removing injurious ingredients from an exhaust gas of an engine, and the electronic control unit decides the deterioration of the catalyst only when it decides that the catalyst is activated. It is thereby possible to avoid erroneous decision of the deterioration since the deterioration of the catalyst is not decided when the catalytic converter is not activated.

Deterioration detecting apparatus for catalytic converter

A dual-sensor type air-fuel ratio control system for an internal combustion engine. A catalytic converter is disposed within an exhaust pipe for purifying an exhaust gas. A first air-fuel ratio sensor 11 is disposed upstream of the catalyst for detecting concentration of a particular component of the exhaust gas to output a first air-fuel ratio signal V1 indicating the concentration. A second air-fuel ratio sensor 12 is disposed downstream of the catalyst for detecting concentration of the particular exhaust gas component to output a second air-fuel ratio signal V2 indicating the concentration. An electronic control unit M8 controls a target air-fuel ratio of a mixture supplied to the engine by arithmetically determining an air-fuel ratio control quantity on the basis of the first and second air-fuel ratio signals.

A dual-sensor type air-fuel ratio control system for an internal combustion engine. A catalytic converter is disposed within an exhaust pipe for purifying an exhaust gas. A first air-fuel ratio sensor 11 is disposed upstream of the catalyst for detecting concentration of a particular component of the exhaust gas to output a first air-fuel ratio signal V1 indicating the concentration. A second air-fuel ratio sensor 12 is disposed downstream of the catalyst for detecting concentration of the particular exhaust gas component to output a second air-fuel ratio signal V2 indicating the concentration. An apparatus for detecting deterioration of the catalytic converter includes a deterioration decision means 54 for determining deterioration of the catalyst on the basis of at least the second air-fuel ratio signal, a filtering means 50 for filtering the second air-fuel ratio signal to thereby derive a filtered air-fuel ratio signal, and comparison means 51 for comparing the second air-fuel ratio signal with the filtered air-fuel ratio signal. The deterioration decision means compares a deterioration parameter value derived from the result of the comparison with a predetermined value corresponding to a detected operation state of the engine to determine deterioration of the catalyst when the deterioration parameter value exceeds the predetermined value.

A dual-sensor type air-fuel ratio control system for an internal combustion engine. A catalytic converter disposed within an exhaust pipe is flanked by first and second upstream and downstream air-fuel ratio sensors 11, 12. An apparatus for detecting deterioration of the catalytic converter includes a deterioration parameter calculating circuit 60, a filter circuit 61, and a comparison decision circuit 62. The decision circuit compares a filtered deterioration parameter value .gamma.f with a predetermined value corresponding to a detected operation state of the engine to determine deterioration of the catalyst when the deterioration parameter value exceeds the predetermined value.

A dual-sensor type air-fuel ratio control system for an internal combustion engine. A catalytic converter disposed within an exhaust pipe is flanked by first and second upstream and downstream air-fuel ratio sensors 11, 12. An apparatus for detecting deterioration of the catalytic converter includes a deterioration decision circuit 54 for determining deterioration of the catalyst on the basis of at least the second air-fuel ratio sensor signal, a filter circuit 50 for filtering the second sensor signal, and a comparison circuit 51 for comparing the second sensor filtered and unfiltered signals. The deterioration decision circuit compares a deterioration parameter value derived from the result of the comparison with a predetermined value corresponding to a detected operation state of the engine to determine deterioration of the catalyst when the deterioration parameter value exceeds the predetermined value.

Dual-sensor type air fuel ratio control system for internal combustion

In a trouble diagnosis device for an exhaust gas return control system in which a returning amount of exhaust gas is changed at a predetermined value to obtain a variation between operating conditions of the engine under before thus changing and under after thus changing, and the variation is compared with a predetermined value, thereby to determine whether or not the exhaust gas return control system is out of order. A variation rate in the detection value of the operating conditions of the engine is obtained every predetermined period of time, and when the variation rate thus obtained exceeds a predetermined rate, the trouble diagnosis operation for the exhaust gas return control system is suspended.

Trouble diagnosis device and method for exhaust gas return control device

A malfunction sensing apparatus for a fuel vapor control system includes a fuel tank and a canister containing an adsorbent for adsorbing fuel vapor. The canister has an inlet connected to the fuel tank and an outlet. A purge control valve is connected to the outlet for connecting and disconnecting the outlet of the canister from the air intake pipe of an engine. A pressure sensor senses the internal pressure of the fuel tank. A malfunction sensing means responsive to the pressure sensor senses a malfunction when the purge control valve is open and the pressure sensed by the pressure sensor is above a prescribed value. A prohibiting means senses the rate of change and/or the magnitude of the pressure sensed by the pressure sensor with the purge control valve closed and prohibits malfunction sensing by the malfunction sensing means when the rate of change of the pressure exceeds a prescribed rate and/or the magnitude of the pressure exceeds a prescribed value.

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Hyogo, Japan

Shinya Fujimoto