Hitachi, Ltd.

Toshio Furuhashi

Seiji Suda

Masumi Imai

Yasunori Mouri

Osamu Abe

Taiji Hasegawa

Takeshi Atago

Tokuo Kosuge

Masao Takato

Noboru Sugiura

Tatsuya Yoshida

Kiyoshi Miura

Seiji Asano

Matsuo Amano

Masami Shida

Hiroatsu Tokuda

Kozo Katogi

Kotaro Hirasawa

Shizuhisa Watanabe

Toru Sugawara

Yasunori Mori

Tomoji Inui

Hiroastu Tokuda

Osame Abe

A system and method for load sharing processing operations between a vehicle mounted station (105) and a stationary base station (25) having a large capacity host computer is described. The vehicle mounted station has detectors for determining operating conditions of a vehicle and controllers (3, 4, 501) for varying the operating conditions. The controllers are connected to a transmitter-receiver (5) which is arranged to communicate over a path (10) with a transmitter-receiver (11) of the base station. The base station has a host computer (18) having a large memory capacity. At predetermined intervals, for example, distance of travel or at engine stop, the vehicle transmitter (5) transmits operating conditions to the base receiver (11) for data processing and the base transmitter (11) then transmits processed data back to the vehicle receiver (5), whereupon the controllers (3, 4, 501) modify the vehicle operating conditions. The vehicle operating conditions may be an indication of life expectancy of fuel injectors or sensors, updating data processing maps. The presence of abnormal operating conditions may be detected by the vehicle mounted station, evaluated by the base station and an emergency warning indication provided back to the vehicle mounted station, or if the abnormal condition is not of an emergency nature then counter measures are transmitted from the base station to the vehicle mounted station.

System and method of load sharing control for automobile

Disclosed is an ignition control apparatus for an internal combustion engine arranged to control an ignition timing and a current conduction initiating timing on the basis of a time elapsed from a point in time at which a reference position is reached by a crank shaft, in which a crank reference position detector is caused to generate a crank reference position signal which is reversed in polarity at a crank reference position of each cylinder of the engine as well as at an intermediate position between a preceding and a succeeding timing at the crank shaft reference position, and a leading edge and a trailing edge of the crank reference position signal are detected so as to determine each of the detection of the revolutional speed of the engine, the ignition timing, and the period of current conduction on the basis of a time elapsed from the detected leading edge or the trailing edge. Thus, it is possible to perform the ignition control accurately by using only one sensor synchronized with the revolution of said engine.

Ignition control apparatus for internal combustion engine

An apparatus for controlling the operation of an internal combustion engine having a carburetor which, controls the air-fuel ratio of the air-fuel mixture supplied to the engine in the steady operating condition of the engine on the basis of predetermined data determined relative to the engine crankshaft rotation speed and intake vacuum and stored in a memory. A three-way catalyst purifies engine exhaust gases, and an output signal from an O.sub.2 sensor in the exhaust system is fed back for the control of the air-fuel ratio in the engine exhaust gases. A circuit checks whether this feedback control is normally carried or not. The air-fuel ratio supplied to the engine in an unsteady operating condition of the engine is controlled by regulating the fuel and air supplied to the engine while bypassing the carburetor, by the sensed values of the intake vacuum, engine crankshaft rotation speed and engine temperature and also depending on the throttle valve position. To control the rate of exhaust gas recirculation, an upper limit and a lower limit of the rate of opening of a recirculation rate regulating valve are determined on the basis of the sensed throttle valve opening, and other predetermined data determined relative to the engine crankshaft rotation speed and intake vaccum is read out from the memory to limit the rate of opening of the recirculation rate regulating valve.

Control apparatus for an internal combustion engine having a carburetor

A method of electronically controlling the operation of an internal combustion engine is effected on the basis of results of arithmetic operations of digital control quantities derived from detected operating conditions of the engine through digital processing operations. The digital processing operations are subdivided into a number of tasks in dependence on the control functions to be performed. In addition, these tasks are subdivided into a plurality of priority levels. The memory has a task control block having run or execution flag areas in response to the priority levels and start request flag areas in response to the tasks, the start request flag areas being classified in accordance with the levels, in order to make it easy to correct, alter or add tasks. An order for starting the execution of the task is always controlled in accordance with the condition of the run flags and the start request flags.

Engine control method

An apparatus for controlling the operation of an internal combustion engine having a carburetor, especially, the air-fuel ratio and the rate of exhaust gas recirculation, controls the air-fuel ratio of the air-fuel mixture supplied to the engine in the steady operating condition of the engine on the basis of predetermined data determined relative to the engine crankshaft rotation speed and intake vacuum and stored previously in a memory. A three-way catalyst is used to purify engine exhaust gases, and an output signal from an O.sub.2 sensor in the exhaust system is fed back for the control of the air-fuel ratio in the engine exhaust gases. A circuit is provided to check whether this feedback control is normally carried or not. The air-fuel ratio of the air-fuel mixture supplied to the engine in an unsteady operating condition of the engine is controlled by regulating the amounts of fuel and air supplied to the engine while bypassing the carburetor, on the basis of the sensed values of the intake vacuum, engine crankshaft rotation speed and engine temperature and also depending on the throttle valve position. For the control of the rate of exhaust gas recirculation, an upper limit and a lower limit of the rate of opening of a recirculation rate regulating valve are determined on the basis of the sensed throttle valve opening, and other predetermined data determined relative to the engine crankshaft rotation speed and intake vacuum is read out from the memory to limit the rate of opening of the recirculation rate regulating valve.

A control system for controlling the opening degree of a solenoid valve provided in an air or fuel supplying system for engine to thereby control the air/fuel ratio of the gas mixture being supplied to the engine. This control system includes a device for accumulating the number of revolutions of the engine from the time the engine starts. When the accumulated value reaches a predetermined value, it is decided that the warming-up of engine is completed. Then, the output of the O.sub.2 sensor for detecting the oxygen O.sub.2 concentration in the exhaust gas is fed back to thereby perform the closed loop control for the air/fuel ratio. Before the accumulated value reaches the predetermined value, the closed loop control is performed without use of the output of the O.sub.2 sensor.

Control system for internal combustion engine

Method and apparatus for controlling ignition timing of an internal combustion engine employing rotation speed information and load information of the engine to determine ignition timing data. A correction amount used to retard the ignition timing and representative of the magnitude of knocking is produced when knocking of the engine is detected. The ignition timing data is corrected in the direction of retardation based on the correction amount, and the ignition timing data is advanced at a predetermined cycle by a desired angle at a time during the time period in which knocking is not detected.

Method and apparatus for controlling ignition timing of internal

In a method and a system for engine control an engine control signal is generated on the basis of a signal produced at each moment from at least one sensor for detecting the operating condition of the engine, the control signal being used for engine control. In order to attain the proper engine operating condition, data representative of the detection signal from the sensor is adjusted in advance, and data for correcting the sensor output is calculated from said adjustment value, the correction data being stored in a memory. While the engine is running, the data representative of the detection signal from the sensor is corrected by the correction data stored in the memory, and this corrected detection signal representative data is used to produce the control signal.

Method and system for engine control

An apparatus and a method for controlling an internal combustion engine are disclosed, wherein upon deceleration of the engine, fuel injection is interrupted on the basis of determination of an engine operating condition to interrupt the fuel injection, while the fuel injection is then restored on the basis of determination of an engine operating condition to restore the fuel injection. When the determination is made such that the fuel injection is to be restored, the ignition timing determined in dependence on the prevailing engine operating condition is delayed. The delayed ignition timing is progressively advanced after restoration of the fuel injection to regain the original ignition timing determined in dependence on the prevailing engine operating condition.

Apparatus and method for controlling internal combustion engine

A process for electronically controlling an internal combustion engine employ a plurality of engine controlling programs to be executed by a central processing unit classified into a number of task programs in accordance with processing functions of the CPU. The periods at which the task programs are to be activated are determined in consideration of the influential significance of the tasks in controlling the engine, whereby the task programs are executed in accordance with the activation periods thereof under supervision of a program for monitoring the plurality of the engine control programs.

Electronic type engine control method and apparatus

An electronic type air/fuel ratio control system for use in gasoline engines comprises an accelerator, a detector of the manipulation angle of the accelerator, a shunt conduit by-passing a throttle valve, an air by-pass valve exposed in the shunt conduit for controlling flow rate of by-pass air, and a control circuit. The control circuit is responsive to the output of the accelerator manipulation angle detector and generates a control signal for the air by-pass valve, whereby the air/fuel ratio can be controlled with high accuracy when the flow rate of air is low.

Electronic type air/fuel ratio control system

An electronic engine control apparatus controls the engine on a basis of the outputs of the digital processor which arithmetically processes output signals from plural sensors for detecting the operating conditions of the engine. Whether or not a pulse to be generated in timing with the rotation of the engine has been generated within a preset period of time, as specified by the digital processor, is checked. If the pulse is generated, a timer for measuring the preset period is cleared. If the pulse is not generated within the preset period, a signal indicating the stopping of the engine is generated, whereby an interrupt signal is generated to cause the digital processor to process the interrupt.

Electronic engine control apparatus having arrangement for detecting

An electronic control apparatus for an internal combustion engine having engine parameter data sensors, an input/output unit, actuators and a data processing unit carries out a prescribed scenario for starting the engine. The starting sequence begins with the operation of a starting subsystem having a switch the state of which controls the operation of the starter motor. The starter motor is caused to be engaged and a set of initialization procedures are carried out by the data processing unit and input/output unit in dependence upon the state of the switch in the starting subsystem. These initializing procedures include engine operation control calculations as well as system preset steps. During this time, prescribed interrupts which would otherwise be delivered to the data processing unit from the input/output unit are inhibited. However, once the engine has been started, the interrupt inhibit is removed and the system operates under normal conditions.

Technique for controlling the starting operation of an electronic engine

The previous ignition timing is used as a starting point for repititive ignition cycles to define the primary coil current flow starting point, in order to secure a sufficient current flow duration for the primary coil current that is supplied to an ignition coil to thereby prevent a shortage of ignition energy. An arithmetic circuit including a central processor produces data representing the duration between the previous ignition timing and the primary coil current flow starting point. A counter starts this counting operation from the previous ignition timing. The primary coil current feed to the ignition coil starts at a time when the contents of the counter are coincident with the result of the processor produced data. The data is obtained by subtracting a necessary primary current flow duration or time from the interval between the previous ignition timing and the present ignition timing.

Method for controlling an internal combustion engine

A control apparatus for an internal combustion engine in which a plurality of sensors are provided to detect operating conditions of the engine and the detected signals are converted into digital signals for the arithmetic operation executed in a central processor. This apparatus includes a register for storing data supplied from the central processor, a counter for counting up pulses produced each time the engine rotates a fixed crank angle, and a comparator for producing an output when a count value of the counter becomes equal to or greater than the data set in the register. A logic circuit is provided to produce a control pulse on the basis of the output of the comparator for the control of fuel injection. Upon the detection of conditions to correct the quantity of fuel injected into the engine, such as during acceleration, the data to be set into the register is changed.

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Mito, Japan

Toshio Furuhashi