Mitsubishi Denki Kabushiki Kaisha

Toyo Kogyo Co., Ltd.

Mitsubishi Jidosha Kogyo Kabushiki Kaisha

Mitsubishi Denki K.k.

Mitsuaki Ishii

Masaaki Miyazaki

Atsushi Ueda

Shizuo Sumida

Kazuo Nii

Osamu Shimizu

Ryoji Nishiyama

Kouichi Yamane

Hiroyuki Nishizawa

Kimito Kashiwabara

Osamu Nako

Noboru Nakamura

Hideo Kakinuma

Hajime Kako

Hisatsugu Ito

Hiroshi Fukuchi

Takahiro Matsunaga

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

A control apparatus for a motor vehicle which can be quickly unit tested during manufacture. Normally, the control apparatus processes signals from various operating condition sensors and applies them to determine the values of control signals to respective controlled elements, wherein there is a delay between the starting of the engine and the use of one of the sensors, namely, the exhaust gas O.sub.2 sensor in determining the value of the respective control signal. To test the apparatus, signals simulating the outputs of at least one of the sensors are set to states which are improbable in acutal operation. Upon detecting such a condition, the control apparatus removes the delay from the starting of the engine and immediately applies all output signals from the sensors to determine their respective control signals.

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 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.

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.

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.

A waveshaping circuit for providing logic levels from a voltage source to a digital circuit comprising a pull-up (or pull-down) resistor for converting the voltage source into voltage signals of predetermined values, a low-pass filter connected to the resistor for eliminating noise components of the voltage signals, a voltage limiter for limiting the voltage signals to a predetermined voltage range, and a voltage divider for receiving and dividing the voltage signals to supply output voltages of high or low logic levels to the digital circuit.

Waveshaping circuit

Engine speed control apparatus

Idling speed control system of an internal combustion engine

A terminal signal operation apparatus is disclosed for transmitting in a multiplex transmission system in both directions signals between the terminal signal operation apparatus and a central operation apparatus for centrally generating control signals for controlling a plurality of electrical devices at terminals in accordance with a signal generated by a signal source. The terminal signal operation apparatus includes a signal separation circuit for detecting the control signals transmitted from the central operation apparatus, a driving circuit whose input is connected to the output of the signal separation circuit for driving an electrical device in accordance with the control signals, a return signal generating circuit for generating a signal for transmission to the central operation apparatus upon detection of a malfunction of the electrical device or a malfunction of the signal source or a signal from the signal source so that the signals in both directions between the terminal signal operation apparatus and the central operation apparatus can be processed by a single circuit.

Terminal signal operation apparatus

A central processing apparatus for use in a system which includes a plurality of remote electrical devices and a multiplex signal transmission line coupled to each of the plurality of devices. The central processing apparatus comprises an input unit coupled to the multiplex signal transmission line for receiving state signals from the plurality of devices in a time division multiplex format representing the states of the plurality of devices; an output unit coupled to the multiplex signal transmission line for transmitting logically processed signals to the plurality of devices in a time division multiplex format to control the plurality of devices; a logic processor responsive to the receiving of the state signals to generate the logically processed signals; a memory coupled to the logic processor, the input unit, and the output unit, for storing the state signals received from the plurality of devices and the logically processed signals generated by the logic processor; and a stored program control section coupled to the memory, the logic processor, the input unit, and the output unit for controlling the operation thereof.

Central processing apparatus for generating and receiving time division

A control apparatus for controlling a plurality of electrical devices comprising a plurality of electrical devices, a central operation device for generating a plurality of control signals for controlling the electrical devices, the plurality of control signals comprising a first signal for driving a first electrical device and a second signal delayed in time from the first signal to permit discontinuance of the driving of the first electrical device if a high current is detected passing therethrough, a terminal operation device for each electrical device, a signal transmission line for transmitting the plurality of control signals from the central operation device to the terminal operation devices, a first terminal operation device for driving the first electrical device comprising a signal division circuit for dividing from the plurality of control signals said first and second signals, a driving circuit connected to the signal division circuit for driving the first electrical device in response to said first signal, a state detecting circuit for detecting a high current in the first electrical device, a state signal generating circuit connected to the state detecting circuit, the signal division circuit and the driving circuit for deactivating the driving circuit to discontinue the driving of the first electrical device only upon receipt of a signal from the state detecting circuit indicating high current in the first electrical device and receipt at the same time of said second signal, said second signal being delayed in time from said first signal so that high transient starting current in the first electrical device has subsided by the time of said second signal so that driving of the first electrical device will be discontinued when high current is present therein with the exception of the presence of high transient starting current.

Control apparatus for electrical devices

An electrical device control system comprising: a plurality of signal sources; a plurality of electrical loads; a central operation apparatus; a plurality of terminal operation apparatus connected to the plurality of electrical loads and having means to detect the operation and a fault of the signal source and a fault of the electrical load and to generate a time division signal thereof; a multiple signal transmission line connecting the plurality of terminal operation apparatus to the central operation apparatus to transmit the time division signal to the central operation apparatus; the central operating apparatus having means to generate an activating signal for transmission over the multiple signal transmission line to the terminal station apparatus to operate an electrical load in response to the detection of the time division signal.

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Himeji, Japan

Mitsuaki Ishii