Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Denki K.k.

Masanobu Uchinami

Toshihisa Takahashi

Shinichi Nishida

Ryoji Nishiyama

Hitoshi Inoue

Hiroyoshi Suzuki

Koji Nishimoto

Seiya Kominami

Kouichi Yamane

Akira Morishita

Katsumi Adachi

Wataru Fukui

Kenji Ogawa

Yukinobu Nishimura

Yuji Kishimoto

Toyoaki Fukui

Yasuhiro Kimoto

Koichi Yamane

Takahiro Moronaga

Shogo Omori

A charge control system for an internal combustion engine which is capable of suppressing electromagnetic noise due to a control signal to a generator, and which prevents overcharging a battery even if an input terminal receiving the control signal is grounded. The charge control system is composed of a generator 1 driven by an engine of a motor vehicle and a battery 4 charged with the output of the generator 1. Also included in the system is a computer unit 2 comprising a microcomputer CPU for calculating a target voltage Vreg on the basis of the operational states of the motor vehicle for comparison with a battery voltage Vb so as to output a drive signal in accordance with the comparison result. This drive signal operates a transistor Tr, incorporated into the generator, to control a field current 1f of the generator 1 so that the quantity of the power generation of the generator 1 increases and decreases to control the quantity of the charge to the battery 4.

Charge control system for use in internal combustion engine

A controller for a four-stroke cycle internal-combustion engine, which has a single sensor mounted on a crankshaft and employs a single sequence of position signal pulses corresponding to crank angles, achieves reduced cost and higher accuracy even for an engine with an odd number of cylinders. For each revolution of the crankshaft, a position signal pulse is issued from the sensor mounted on the crankshaft; the position signal pulse includes a reference position signal pulse in a number which is a multiple of N of the number of cylinders and a cylinder identifying signal pulse for a particular cylinder every time the crankshaft rotates. A control means includes a reference position signal generating section for identifying the reference position of each cylinder from the position signal pulse and for generating the reference position signal; a cylinder identifying section for identifying each cylinder from the position signal pulse and for generating a cylinder identifying signal; and a timing control section for generating a control signal for each cylinder in accordance with the reference position signal and the cylinder identifying signal. The control signal controls at least the ignition timing or the fuel injection timing of each cylinder.

Controller for four-stroke cycle internal-combustion engine

An oxygen concentration detection apparatus for an internal combustion engine is capable of starting feedback control of an air-fuel ratio in the shortest time possible after the engine has been started, thereby preventing the blackening of an oxygen concentration sensor 1, incorrect determination of the air-fuel ratio immediately after start of the current supply to a heating element 20, and damage to the oxygen concentration sensor 1 due to a temperature rise of the heating element 20 when the engine is cold started. A heating state of the heating element 20 of a variable resistance type, which heats the oxygen concentration sensor 1, is detected so that the current supply to an oxygen pumping device 18 is controlled in accordance with the detected state of the heating element 20.

Oxygen concentration detection apparatus

An object of the present invention is to provide an AC generator output controlling apparatus which can appropriately control the generating operation timing of an AC generator and which can prevent excessive load on an internal combustion engine due to the unnecessary generating operation of the AC generator. The output controlling apparatus has an AC generator driven by an internal combustion engine to generate an AC voltage, a rectifier for converting the generated AC voltage into a DC voltage, a battery charged by the converted DC voltage, and a charge control circuit for determining a duty for a field current supplied to a field coil of the AC generator from the battery on the basis of a voltage deviation between the charged DC voltage and a predetermined target voltage of the battery, and stopping the supply of the field current when the duty amount is lower than a predetermined value.

AC generator output controlling apparatus and method

An automotive electronic control device includes an electronic control unit 6 for controlling an automotive alternator 2 and the ISCV (Idling Speed Control Valve) 8 of the engine. To improve the mileage of the automobile, the duty factor of the alternator 2 is reduced to zero when the electric load is a light load. Further, when the increase in the load current I.sub.L during the idling is above a load current threshold increment level .DELTA..sub.LT, the ISCV (Idling Speed Control Valve) 8 is controlled to increase the air intake, and, simultaneously, the duty factor of the alternator 2 is reduced to a low level for a predetermined length of time equal to the response time in which the rpm of the engine responds to the increase of the air intake effected by means of the ISCV (Idling Speed Control Valve) 8. The duty factor of the alternator 2 is gradually increased thereafter. The idling rpm of the engine can thus be stably controlled when a heavy electric load is turned on.

Electronic control device for controlling the alternator and the idling

A method of diagnosing an exhaust gas recirculation control system of an engine as to occurrence of a fault in the system. The state of a pressure sensor incorporated in the exhaust gas recirculation system for controlling the recirculation is checked with the aid of various parameters involved in operation of the engine. When the pressure sensor is found as suffering from abnormality such as freezing and inoperative, execution of the diagnosis or result obtained after execution of the diagnosis is invalidated.

Method of diagnosing exhaust gas recirculation control system of

An electronic control device for an internal combustion engine having a control unit for detecting a running state of an engine, and which controls a fuel quantity or an ignition timing of the engine in accordance with the running state, where the electronic control device monitors the transient running state of the engine, and includes a fuel property sensor for detecting a fuel property, such that the fuel quantity or the ignition timing is corrected in accordance with the fuel property under the transient running state.

Electronic control device for an internal combustion engine

A fuel injection apparatus has an injector 4 for supplying fuel to an internal combustion engine 1, an air passage 35 having one end connected to the injector for atomizing the fuel injected therefrom and the other end connected to an air source, an air control valve 30 disposed in the air passage for controlling the quantity of air flowing therethrough, and a control unit 37 connected to the air control valve for controlling it in accordance with operating conditions of the engine. A pressure pump 40 may also be connected in the air passage for pressurizing the air therein, together with a pressure adjuster 42 disposed in a by-pass pipe 44 for controlling the pressure within the air passage, and a check valve 46 for preventing any pressurized air back flow.

Fuel injection apparatus for an internal combustion engine

When or just after an engine (1) is started, a starting switch (9) is turned on and a value is set in a just-after-starting counter in a CPU (114). The starting or just-after-starting state is detected. Fuel temperature and fuel properties are detected by a fuel properties sensor (16). The detected values are calculated in the CPU (114). Fuel temperature detection output is corrected, then a filter value or average value is calculated and stored in RAM (114b) in the CPU (114) and just after the engine is started, based on the stored value, driving of a bypass control valve (6) and an injector (12) is controlled and the fuel amount or air amount is controlled for the engine. Thereby, it is enable optimum fuel amount control when and just after an engine is started regardless of the differences in the fuel properties.

This invention relates to a trouble diagnosis device for an exhaust gas recirculation (EGR) of an internal combustion engine. In the condition that an EGR control valve is turned on and off according to whether or not the operating condition of the engine is in the EGR control zone, and a trouble diagnosis condition is satisfied, sensors detect a plurality of engine operation conditions. A trouble diagnosis device receives the output detected by one of the sensors and compares the output with a predetermined value of the same kind as the output a normal state of the EGR system corresponding to the engine condition detected by the sensors, thereby the trouble of the EGR control system is diagnosed. Specifically, one of the sensors detects NO.sub.x in exhaust gas or exhaust gas temperature.

Trouble diagnosis device for exhaust gas recirculation system

An air-fuel ratio control apparatus for an internal combustion engine controls a fuel supplying means by a signal generated from an air-fuel sensor so that the air-fuel ratio of a gas mixture to be sucked into the internal combustion engine becoms a target air-fuel ratio. The air-fuel ratio control apparatus corrects the target air-fuel ratio by a parameter on the condition of the engine detected by the detecting means so that a fuel supplying device is controlled to obtain a corrected target air-fuel ratio.

Air-fuel control apparatus for an internal combustion engine

In one aspect of the present invention, fuel is injected through the injector into the internal combustion engine in non-synchronism with a predetermined crank angle or a predetermined ignition timing each time when the intake air pipe pressure traverses a predetermined set value from the smaller value side to the larger value side. In another aspect of the present invention, the fuel injection is effected in non-synchronism with the predetermined crank angle or the predetermined ignition timing when the intake air pipe pressure traverses a second predetermined value which is selected among a plurality of predetermined set values (the second predetermined value being larger in the absolute value than a first set value, and being close to the first set value) in a case that a time of traversing the first and second set values of the intake air pipe pressure is shorter than a predetermined time.

An air-fuel ratio control apparatus comprises a broad range air-fuel ratio sensor to detect continuously an air-fuel ratio on the basis of components of exhaust gas from an engine, a determining means to determine a correction coefficient by obtaining an error between the target air-fuel ratio and an actual air-fuel ratio, an integrating means to integrate the correction coefficient, a non-volatile memory to store the integrated value as information of correction in relation to operational conditions of the engine, a processing means to calculate a basic fuel injection quantity on the basis of the operational conditions of the engine, and a correction means to correct the basic fuel injection quantity depending on the information of correction.

Air-fuel ratio control apparatus

An automotive fuel injection system for detecting as quickly as possible the occurrence of acceleration without employing a throttle sensor to thereby perform an asynchronous fuel injection for the purpose of maintaining the air-to-fuel ratio of the combustible air-fuel mixture at an optimum value during the acceleration of the automotive engine. The automotive fuel injection system comprises a device for comparing the pressure inside the fuel intake system with an average value of the pressures inside the fuel intake system. When the pressure prevailing in the fuel intake system deviates by a predetermined quantity from the average pressure inside the fuel intake system, acceleration is deemed as actually occurring in the automotive engine and, hence, asynchronous fuel injection is effected substantially simultaneously with the detection of the occurrence of engine acceleration.

Automotive fuel injection system

A fuel controller for an internal combustion engine has a misfiring sensor which can detect when misfiring occurs in an engine cylinder. When misfiring is detected, the fuel injector corresponding to the misfiring cylinder is prevented from supplying fuel to the misfiring cylinder, while the fuel injectors for the other cylinders continue to operate normally. The fuel injector for the misfiring cylinder can be disabled by a switching circuit which turns off a power amplifier for driving the fuel injector. Misfiring can be detected by sensing changes in the rotational speed of the engine between prescribed crankshaft angles due to a reduction in torque when misfiring occurs.

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Himeji, Japan

Masanobu Uchinami