Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Mitsubishi Denki K.k.

Mikuni Corporation

Masaaki Miyazaki

Mitsuaki Ishii

Hajime Kako

Ryoji Nishiyama

Shinji Kojima

Kouichi Yamane

Hiroyuki Nishizawa

Kimito Kashiwabara

Osamu Nako

Noboru Nakamura

Hideo Kakinuma

Kazuyori Katayama

Shoichi Washino

Hiroshi Fukuchi

Takahiro Matsunaga

Koji Ezumi

Masanobu Murakami

A constant speed running device controls a vehicle speed, which includes a running condition setting member for setting an aimed vehicle speed for at least one of the constant speed control, an acceleration condition and a deceleration condition. The device further includes control member to calculate controlled variables for controlling the vehicle speed in accordance with a deviation between the actual running speed detected by a vehicle speed sensor and the aimed vehicle speed. The running condition setting member sets the aimed vehicle speed to the actual running speed when a predetermined period of time elapses after at least one of operations of the acceleration condition and deceleration condition.

Constant speed running device

An air-fuel ratio controller, including: fuel injection apparatus to supply an engine with fuel, a quantity of fuel to be delivered by the fuel injection apparatus being controlled by an impressed fuel quantity injection pulse having an injection time width corresponding to a desired fuel quantity; engine status detecting apparatus for detecting a status of at least one of a rotation frequency, intake manifold pressure, and volumetric efficiency operating parameter with respect to an operation of the engine; basic fuel quantity calculating apparatus for calculating a basic fuel quantity according to the status detected by the engine status detecting apparatus; air-fuel ratio sensor apparatus for detecting an air-fuel ratio in an exhaust gas from the engine; proportional integral processing apparatus for integrally processing and calculating an actual fuel quantity according to the output from the air-fuel ratio sensor apparatus; learning apparatus for calculating, using an output from the integral processing apparatus, a learned value to correct the basic fuel quantity into a controlled fuel quantity; learned value correcting apparatus for correcting the basic fuel quantity by using the learned value from the learning apparatus; and, calculation prohibiting apparatus for prohibiting the learning apparatus from calculating until a predetermined time lapses after the engine starts, or until a predetermined time lapses after an engine cooling water temperature is detected to have reached a predetermined temperature level.

Air-fuel ratio controller

An abnormality detecting device for an EGR system comprises an EGR valve disposed in an EGR passage to control a flow rate of exhaust gas recirculated therethrough, a first temperature detecting device disposed in the EGR passage to detect the temperature of the same, a second temperature detecting device disposed in the intake air passage of an internal combustion engine, an operational condition detecting device to output parameters of the engine or the EGR valve as signals indicating operational conditions of the engine, an EGR abnormality determining zone discriminating device adapted to discriminate that the operational conditions are in a predetermined EGR abnormality determining zone in the operable area of the engine or the EGR valve in which recirculation of the exhaust gas is controlled by the EGR valve, and an abnormality determining device to determine abnormality in the EGR system on the basis of a quantitative relation between a value of the EGR abnormality determining temperature which is obtained by the calculation of the operational conditions and an output signal of the second temperature detecting device, and a value of the temperature of the EGR passage detected by the first temperature detecting device.

Abnormality detecting device for an EGR system

A vehicle control apparatus includes a condition detection device for detecting output information of at least one of the sensors having a predetermined condition which is improbable in practical use, a read only memory having data stored therein which identifies control specifications of the apparatus, and a data read out device for reading out the identifying data as a control signal for an object to be controlled.

Vehicle control apparatus

An air-fuel ratio control system for use in an internal combustion engine is disclosed which comprises a supply unit equipped with a carburetor incorporating an acceleration pump for supplying fuel to the internal combustion engine and at least one duty-controlled solenoid valve adapted to controlling the air-fuel ratio; an operating condition detector for detecting the operating condition of the internal combustion engine; an acceleration controlled-variable decision unit for setting a predetermined acceleration controlled-variable being given to the solenoid valve during different acceleration control times corresponding to the operating condition or different acceleration; and a control variable decision unit for determining the controlled duty of the solenoid valve according to the data from the operating condition detecting unit and when the controlled variable is given by the acceleration controlled-variable decision unit at the time of acceleration, according to the acceleration control variable.

Air-fuel ratio control system for use in internal combustion engine

A fuel injection device for an automotive internal combustion engine is disclosed, which comprises two distinct acceleration state determining means, i.e., a rapid and a slow acceleration state judgement means, for determining the amount of the asynchronous augmentation of fuel. The rapid acceleration state judgement detects the rapid acceleration state by comparing with a first threshold level the increment of the throttle opening degree over each period of an A/D conversion timing signal; the slow acceleration judgement means, on the other hand, detects the slow acceleration state by comparing with a second threshold level the increment of, for example, the throttle opening degree signal over, for example, two successive periods of the same A/D conversion time signal. When the rapid acceleration state is detected, an asynchronous augmentation of fuel for the rapid acceleration is effected. On the other hand, an asynchronous augmentation of fuel for the slow acceleration is effected only if: (1) the rapid acceleration state is not detected, and (2) the slow acceleration state is detected, over the two successive periods of the timing signal.

Fuel injection device for an internal combustion engine

A control apparatus for a fuel injector has a microcomputer which calculates a basic pulse width of pulses to be applied to a fuel injector. When the voltage of a battery which powers a fuel pump and the fuel temperature fall below levels which cause the discharge pressure of the fuel pump to drop below a prescribed pressure, the microcomputer corrects the basic pulse width by lengthening it to compensate for the drop in fuel pressure. Pulses having the corrected pulse width are applied to the fuel injector.

Fuel injector control apparatus

A detecting device for detecting abnormality in an EGR system comprises an EGR valve disposed in an EGR passage to control a flow rate of recirculated exhaust gas, a first temperature sensor disposed in the EGR passage to detect the temperature of the same, a second temperature sensor disposed in the air-intake passage of an engine, an EGR abnormality determining zone discriminating means to discriminate a specified operational zone in an operable area for the engine in which recirculation of the exhaust gas is controlled by the EGR valve. Abnormality in the EGR system is detected on the basis of a value obtained by comparison of the output of the first and second temperature sensors in the specified operational zone.

A fuel injection device for an automotive spark ignition internal combustion engine provided with a supercharger is disclosed, wherein the amount of fuel injected in synchrony with the crank angle signal is determined on the basis of the intake air pressure. The increment of the air pressure data over each fuel injection period is compared with a first threshold level to determine the first augmentation. The pressure data is averaged over each fuel injection period, and the increment of the averaged pressure data over a predetermined interval of time is compared with a second threshold level to determine the second augmentation. The fundamental amount is calculated on the basis of either the instantaneous or the averaged pressure data, in dependency on the value of the first augmentation amount. The total amount of fuel that is to be injected in synchrony with every predetermined numberth pulse of the crank angle signal is calculated in each injection cycle as a sum of the fundemental amount and the first and the second augmentation when the engine is judged to be in the supercharged state; when, on the other hand, the engine is judged to not to be in the supercharged state, the total amount of fuel is calculated as the sum of the fundamental amount and the first augmentation alone. The supercharged state is detected when both the intake air pressure and the number of rpm of the engine are above respective predetermined levels.

An engine control apparatus comprises a throttle sensor, a pressure sensor for detecting a pressure in the intake manifold of an engine as a value of the absolute pressure, an engine revolution speed detector, a zone detector for detecting the fact that a signal value indicating a degree of opening of a throttle valve and a signal value indicating an engine revolution speed fall in a predetermined atmospheric pressure detection zone and a processing unit to calculate a value of atmospheric pressure by adding a set value to a signal of pressure upon detecting said values being in the detection zone. A timer may be provided to detect the fact that the signal values of the degree of opening of the throttle valve and the engine revolution speed are continuously in the atmospheric pressure detection zone for a predetermined time.

Engine control apparatus

A fuel injector for a spark ignition internal combustion engine is disclosed, wherein the amount of injected fuel is increased by an extra amount when the engine is in a transient accelerating state. The air pressure within the air inlet passage to the engine is detected by an air pressure sensor, and the load condition is judged by comparing the detected pressure with a reference level. Further, the variation or increment of the detected pressure over each fuel injection period is calculated and compared with a high or a low threshold level selected in accordance with the load condition of the engine. Preferably, the high threshold level is selected when the high load condition continues over a predetermined length of time, the low threshold level being otherwise selected. The amount of transient extra increase is determined in accordance with the result of the comparison of the pressure variation with the selectd threshold level. On the other hand, the fundamental amount of injected fuel is calculated on the basis of an instantaneous current air pressure when the above amount of transient extra increase is not zero; otherwise, on the basis of an average of the pressure over the fuel injection period. The sum of the fundamental amount and the transient increase is injected in synchrony with every predetermined number pulse of the crank angle signal.

An engine control system in which the sensed intake manifold pressure is initially utilized as the atmospheric pressure, before engine rotation, and is thereafter calculated or updated on the basis of the throttle opening and engine revolution values falling within a detection zone for predetermined time.

Atmospheric pressure detecting device for engine control

An apparatus for controlling the operation of an engine based on the pressure in an intake manifold. If a change in the pressure in the intake manifold is equal to or less than a predetermined value during a predetermined period within the period from the time when a voltage source is turned on to the time when a starter is turned on, the pressure in the intake manifold is detected and stored. If the engine is not in the start mode, the rate of fuel supply is increased based on an atmospheric pressure detection value. Based on the comparison between the atmospheric pressure value and a predetermined value, a passage for bypassing a throttle valve is opened and closed to control the idling of the engine.

Apparatus for and method of controlling internal combustion engines

The microcomputer applied control unit for use in a vehicle comprises digital data input device for setting a data direction register immediately before the digital data is read via an I/O port, and storage for storing the data thus inputted by the digital data input device.

Microcomputer applied control unit for use in a vehicle

A vehicle control apparatus comprises a condition detection means for detecting an output condition of any of sensors is in a condition which is improbable in practical use and which is a predetermined one, and a controlled variable conversion means for converting information of the specification change-over means for selection control procedures or control data into a controlled variable for an object to be controlled.

Growing community of inventors

Himeji, Japan

Masaaki Miyazaki