Diesel Kiki Co., Ltd.

Zexel Gmbh

Bosch Corporation

Akira Sekiguchi

Kyoichi Fujimori

Kenji Arai

Kazumasa Kurihara

Yoshinori Uchida

Seishi Yasuhara

Masayoshi Kobayashi

Hidekazu Oshizawa

Kenji Okamoto

Yuichi Kitano

Kazuo Inoue

Masahiko Shinagawa

Hiroshi Okada

Mitsuo Hagiwara

Masao Nakajima

Osamu Mori

Yasuhiro Satoh

Masahiro Sutoh

Yosinori Uchida

In a vehicular system () configured such that data can be transmitted and received via a data bus () between an engine electronic control unit () for controlling an engine and electronic units (-to-n) including a data storing function, the most recent content of accumulated data stored in the engine electronic control unit () is stored as backup data in the electronic units (-to-n) via the data bus () at an appropriate timing, and when the engine electronic control unit () is replaced, the necessary backup data is transferred via the data bus () from any of the electronic units to an engine electronic control unit () after replacement.

Vehicle data backup method

A diesel engine idle speed control system and method wherein a preset running characteristic map is corrected by a learning value updated on the basis of the output of a PID under predetermined conditions for each of different engine load modes, thereby determining a desired injection quantity. The map indicates a relationship between an engine speed and a fuel injection quantity for each of accelerator openings, including an accelerator opening of zero percent. A judgment is made on the present load mode of the engine, and a basic injection quantity corresponding to the present accelerator opening and engine speed is calculated from the running characteristic map. When the vehicle operating condition is in an idle mode, learning is executed so as to optimize a feedback correction quantity used for feedback control for each load mode, and a corrected basic injection quantity is calculated from the basic injection quantity and the learning value. Relearning is executed according to a predetermined condition. Updating of the learning value is also executed according to a predetermined condition. A desired injection quantity is obtained by adding the corrected basic injection quantity and the output value of the PID to each other.

Idle speed control system and method for diesel engine

In an injection timer for a fuel injection system in which control of the timer shifts from feedback control to open loop control when the engine rotation rate is equal to or less than a specific rotation rate, a decision is made as to whether or not the operation is at startup time and, if it is, decision making for the engine rotation rate is canceled and feedback control is maintained even if the engine rotation rate is equal to or less than the specific rotation rate. Because of this, in a fuel injection system which is capable of maintaining the pump chamber pressure at a high level even at low engine rotation rates, the injection timing device can achieve both an improvement in accuracy of injection timing control and anti-pollution measures at startup. In other words, at startup, since the decision making for whether or not to switch to open loop is not required, a reduction in the accuracy of control due to degradation in the output characteristics of the engine rotation rate sensor is prevented, and since the feedback control area is expanded into the low rotation rate range, anti-pollution measures are facilitated.

Injection timing device for fuel injection system

In a fuel injection system for a vehicle engine, the fuel injection is controlled in a feedback mode when no abnormality occurs in the control system, and it is controlled in an open loop mode by a limp home circuit when any abnormality in the control system is detected by a watch dog timer. The vehicle may thus be slowly driven to a safe or proper place for servicing. The limp home circuit includes fuel cutoff means for interrupting the fuel supply to the engine in the open loop mode of operation when the rotational speed of the engine exceeds a predetermined value.

Fuel injection control system for internal combustion engine

A fuel injection device includes an actuator for positioning an adjusting member to establish a fuel injection level. A correcting device such as a resistor is provided to compensate for any positional deviation of the adjusting member during assembly of the fuel injection device. A value of the correcting device is read and compared with an actuator correction value previously stored in a read/write memory such as an E.sup.2 PROM. If the value of the correcting device is within normal parameters and differs from the prestored actuator correction value, the prestored actuator correction value is overwritten using the value of the correcting device to obtain a new stored actuator correction value. The actuator correction value stored in the read/write memory is used to correct the position of the adjusting member.

Electronic fuel-injection device having read/write memory for storing

In a fuel injection timing control apparatus for fuel injection pumps having a pressure response type timer in which the timer is controlled to make an actual injection time conincident with a target injection time through PID control, a control constant for the PID control is determined so as to avoid the influence of a reaction force caused by the fuel injection.

Apparatus for controlling fuel injection timing in a fuel injection pump

A system for checking a malfunction in a controller. The controller includes a microcomputer connected between an input and output terminal of the controller. The microcomputer is programmed to perform a normal control mode, to perform a self-checking mode, and to judge whether conditions of entry into the self-checking mode are met so as to select one of the two modes. An external circuit is connected between the input and output terminals of the controller so as to establish a predetermined relation between the voltage levels of the input and output terminals. In the self-checking mode, the microcomputer outputs a control signal for setting the output terminal to one of high and low logic voltage levels. The microcomputer judges whether an input signal passed to the microcomputer through the input terminal having the predetermined voltage relation with said output terminal has a voltage level corresponding to the voltage level of said output terminal, and judges that there is a malfunction if the input signal is not at the above-mentioned corresponding level. The microcomputer causes the malfunction to be displayed in an external display unit when the microcomputer judges the malfunction.

Malfunction checking system for controller

For controlling a solenoid actuator in PID control mode in response to input control information, the temperature of the coil of the solenoid actuator is detected or estimated, and the constant or constants necessary for PID control calculation are determined taking into account the resulting temperature. The input control information is subjected to the processing operation for PID control operation by the use of the determined constant or constants, whereby desired PID control characteristics can be obtained irrespective of changes in the temperature of the coil of the solenoid actuator. As a result, in particular, the step response and other dynamic characteristics can be improved.

Method and apparatus for controlling solenoid actuator

A peak hold circuit and a sample-and-hold circuit are provided for accurately and immediately detecting variations in a load connected to a generator. The peak hold circuit holds a peak voltage of a waveform voltage signal having an amplitude corresponding to the magnitude of the load. The peak hold circuit is responsive to a reset signal from a reset circuit to be reset during a time interval between a point after the peak of the waveform voltage signal and a point before a subsequent peak of the waveform voltage signal, so that the peak hold circuit is reset, thereby renewing the peak voltage held in the peak hold circuit. When the sample-and-hold circuit receives a sampling instruction signal from a sampling instruction circuit during a time interval between a point after the peak of said waveform voltage signal and a point before said reset signal is outputted, the sample-and-hold circuit operates in a sampling mode to sample the peak voltages outputted from the peak hold circuit. The sample-and-hold circuit is switched into a hold mode before the peak hold circuit is reset, so as to hold the sampled peak voltage.

System for detecting load on generator

A trouble detecting method and apparatus for detecting trouble in either of a first pulse generator for generating first pulses and a second pulse generator for generating N second pulses between each pair of successive first pulses. The number of the second pulses produced between each pair of successive first pulses is repeatedly counted and it is detected whether or not the result of the count is cyclically more than a first predetermined value and whether or not the maximum count cyclically reaches a second predetermined value. On the basis of the results of the detections the determination is made as to whether either of the pulse generators has malfunctioned and if so which.

Method and apparatus for detecting trouble in pulse generators

In the closed-loop control system responsive to an average speed of a multi-cylinder internal combustion engine for obtaining a target idling engine speed, there is provided an optically activatable individual cylinder control system for eliminating the difference between the outputs of the respective cylinders. The closed-loop control system has a data processing circuit for processing control data for the closed-loop control system and enabling the use of the closed-loop control system for at least proportional and integral control, and the control constant used in the data processing circuit is changed depending upon whether or not the individual cylinder control system is used, whereby stable individual cylinder control can be realized.

Apparatus for controlling idling operation of an internal combustion

An idling operation control apparatus consists of a closed-loop control system responsive to an average speed of a multi-cylinder internal combustion engine for obtaining a target idling engine speed. In the closed-loop control system, there is provided an individual cylinder control system in which a first data relating to outputs of respective cylinders of the engine is produced in response to an operation timing of the engine and the differential data showing the difference between the output of the respective cylinder and the output of a reference cylinder is calculated on the basis of the first data. A second control data relating to the fuel amount necessary for nullifying the difference indicated by the differential data is also produced in the latter system and the second data is supplied to the closed-loop control system, whereby the difference among the outputs of the cylinder is reduced.

In an control apparatus for controlling a timing of injection of fuel to be injected into an internal combustion engine, the apparatus comprises a closed loop system in which the data showing the actual timing of injection of of fuel is fed back. When the condition of the operation of the engine becomes a predetermined state, the control system is changed from the closed loop system to another system in which an adjusting member for adjusting the timing of injection of fuel is controlled by a signal which is not related to the actual timing of injection. As a result, the stability of the operation in low engine speed zone is remarkably improved.

A control signal which corresponds to an actual operating condition of the engine is determined on the basis of the design specifications irrespective of an actual operation amount of an operating member of the fuel injection apparatus. The result of the determination is provided for controlling a coupled apparatus which is equipped with the engine.

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Higashimatsuyama, Japan

Akira Sekiguchi