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1. 发明专利

JPH0797954A KNOCKING DETECTION METHOD OF INTERNAL COMBUSTION ENGINE AND IGNITION TIMING CONTROLLER USING IT 失效
公开(公告)号：JPH0797954A
公开(公告)日：1995-04-11
申请号：JP24422493
申请日：1993-09-30
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： SATO MASAHIRO , FUJISHITA MASAKATSU , SHIDA MASAMI , EBISAWA TAKAYUKI , KAWASAKI SEIICHI
IPC分类号： F02P5/152 , F02D45/00 , F02P5/153
摘要： PURPOSE:To surely prevent erroneous judgement of knocking by setting a back ground level initial value at the time of entering into a knocking control range, in a ratio type knocking control method using a resonant frequency where knocking control is limited only in a specified operational range. CONSTITUTION:An injector 16 and an ignition coil 13 are respectively controlled by a control unit 9 based on respective detection signals from respective sensors 2, 5, 11, 12, 200 for respectively detecting operational condition of an engine 7. Namely, characteristic component of knocking is extracted and comparison component is calculated so as to judge the knocking based on the detection signal particularly from the combustion condition sensor 200. In this case, the comparison component is calculated only in a specified operational range, and then the calculated value of the comparison component at the time of separation from this range is maintained. On the other hand, the calculated value of the maintained comparison component is compared with a standard value of the comparison component preliminarily determined at the time of reentering into the specified operational range. The larger value can be made the initial value of the comparison component at time of entering.

2. 发明专利

JPS6424170A COMBUSTION CONTROL CIRCUIT OF INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPS6424170A
公开(公告)日：1989-01-26
申请号：JP17657187
申请日：1987-07-15
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： KATOUGI KOUZOU , MANAKA TOSHIO , SHIDA MASAMI
IPC分类号： F02P5/15 , F02D45/00
摘要： PURPOSE:To develop the capacity of an engine to its maximum, when combustion control is carried out on the basis of the signal detected by a burning light sensor, by detecting accurately the time point when the burning condition is maximum, and determining the crank angle so as to meet this timing for controlling the combustion control quantity. CONSTITUTION:The detected signal S1 of a burning light sensor 1 which is provided to a combustion chamber 20 is input into a control unit 10 via a detecting circuit 18 and a preamplifier 19, thereby combustion is controlled. In this case, the detected signal S1 is input into a zero-cross detector 12 via a highpass filter 11, wherein differentiation is carried out and the zero-cross time point is detected. In addition, in the control unit 10, the detected signal of a crank-angle sensor is counted by a crank-angle counter 13, and further the counted value of the crank-angle at the zero-cross time point is latched by a latch circuit 14. And on the basis of the crank-angle having been latched, the combustion control quantity is controlled by a CPU 16.

3. 发明专利

JPS60204972A IGNITION CIRCUIT FOR CAR EQUIPPED WITH SELF-DIAGNOSIS CIRCUIT 失效
公开(公告)号：JPS60204972A
公开(公告)日：1985-10-16
申请号：JP6073784
申请日：1984-03-30
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： HASUNUMA TAKASHI , WATANABE AKITO , SHIDA MASAMI , SAKAMOTO MASAHIDE
IPC分类号： F02P17/12 , F02P17/00 , F02P17/02 , G05B23/02
摘要： PURPOSE:To easily diagnose the anomaly in an ignition circuit by installing a self diagnosis circuit which catches the ignition-timing of an ignition signal and forms a clock signal and catches the voltage on the primary side of an ignition coil and forms a reset signal. CONSTITUTION:When an ignition signal is outputted from a microcomputer 1, electric conduction starts in an ignition-coil driving part 2, and the ignition signal A varies from Hi to Low at an optimum ignition timing. After an induction voltage is induced on the primary side of an ignition coil 3, and said voltage is wave-form shaping-processed in a wave-form processing part 7, the flip-flop of a self diagnosis circuit 5 is reset, and the output of the flip-flop becomes Low. When anomaly is generated in the ignition system, a reset signal can not be obtained, and the flip-flop becomes Hi. Therefore, the anomaly of the ignition system can be diagnosed by only the judgement that the output of the self-diagnosis circuit 5 is Hi or Low, and the burden for software can be reduced.

4. 发明专利

JPH07224696A ELECTRIC LOAD DETECTION METHOD FOR ENGINE AND DEVICE THEREFOR 失效
公开(公告)号：JPH07224696A
公开(公告)日：1995-08-22
申请号：JP1709994
申请日：1994-02-14
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： AKAGI YOSHIHIKO , FUJISHITA MASAKATSU , SHIDA MASAMI
IPC分类号： F02D45/00 , F02D29/06 , F02D33/00 , H02J1/00 , H02P9/04
摘要： PURPOSE:To make highly pre detection possible so as to improve accuracy of engine speed control by detecting variation quantity of power supply voltage and calculating variation and/or variation quantity of electric load quantity based on variation quantity of power supply voltage. CONSTITUTION:In the case of controlling speed of an engine 162, when any variation in electric load 168 and its variation quantity are detected and when power supply voltage is lower than electric load ON detection voltage, the electric load is detected to be ON so that increase quantity is added to the electric load correction quantity. When power supply voltage is higher than electric load ON detection voltage and power supply voltage is higher than electric load OFF detection voltage, voltage load is detected to be OFF so that reduction quantity is subtracted from the electric load correction quantity. ISC(idle speed control) duty, which is a parameter for setting an intake air quantity in idle time, is thus corrected and computed based on correction quantity corresponding to the variable quantity of electric load 168 and feed back quantity based on rotation speed deviation so as to control ISC valve 154.

5. 发明专利

JPH0763100A ROTATIONAL SPEED CONTROLLER OF ENGINE 失效
公开(公告)号：JPH0763100A
公开(公告)日：1995-03-07
申请号：JP20651493
申请日：1993-08-20
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： AKAGI YOSHIHIKO , SHIDA MASAMI , FUJISHITA MASAKATSU , SUEMATSU HIROYUKI , OKADA MITSUYOSHI , HOSOWARI SHIGENORI
IPC分类号： F02D41/16 , F02D45/00 , F02P5/15
摘要： PURPOSE:To eliminate excessive corrective control so as to prevent oscillation and hunting of an engine by setting values equivalent to the maximum value and the minimum value of stable rotational variation by combustion variation, etc., as threshold values and without correcting/controlling the engine at the time of rotational variation within the threshold values. CONSTITUTION:An injector 51, an ISC valve 54 and an ignition plug 173 are respectively controlled by a control unit 151 based on various kinds of detection signal from various kinds of sensor 1-6 for detecting the operational condition of an engine. Rotational variation is prevented by correcting/controlling a fuel injection quantity, an intake air quantity and an ignition timing, in response to deviation from the target rotational speed set in relation to the engine rotational speed in its idling condition detected by a crank angle sensor 2 especially. In this case, values equivalent to the maximum value and the minimum value of the stable rotational variation by combustion variation, etc., are set as threshold values by a control unit 151. Correction/control is not performed when a rotational speed is within the threshold values.

6. 发明专利

JPH0579397A CAR CONTROL DEVICE 失效
公开(公告)号：JPH0579397A
公开(公告)日：1993-03-30
申请号：JP23928691
申请日：1991-09-19
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： ZAITSU MASAHIRO , SHIDA MASAMI
IPC分类号： F02D45/00
摘要： PURPOSE:To prevent any mis-writing caused by the instant drop of a battery voltage and a sudden noise and the like occurred during EEPROM writing by providing a EEPROM in a serial data transmission type and a battery backup RAM, in a car control device providing CPU. CONSTITUTION:During engine running, the most favorable fuel injection amount and an ignition timing and the like are calculated based on an engine running status and a control parameter is studyed by an aging change, a solid difference and the like so as to memorize to EEPROM 1 in CPU2. Meantime, when the control parameter is written in EEPROM 1, a written data and address are firstly stored in a battery backup RAM 4 temporarily and a written flag is set. Then, the data is written in EEPROM 1 and also whether its written in operation is finished or not is judged and after finish judging, the data is read out from the written same address. The content of EEPROM 1 is compared with the content of the battery backup RAM 4 and its process is finished in the case of the same each other.

7. 发明专利

JPH02129522A METHOD AND DEVICE FOR MEASURING AMOUNT OF SUCTION AIR 失效
公开(公告)号：JPH02129522A
公开(公告)日：1990-05-17
申请号：JP28258088
申请日：1988-11-10
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： KATOUGI KOUZOU , HAYASAKA MASAYOSHI , SHIDA MASAMI , MORI YASUNORI
IPC分类号： G01F1/00 , F02D41/18 , F02D41/34 , F02D45/00 , G01F9/00 , G01M15/00 , G01M15/04
摘要： PURPOSE:To measure with high accuracy by converting the analog output voltage of a suction air flowmeter into a pulse train and measuring its time width, and calculating a mean period of one pulse. CONSTITUTION:The suction air flowmeter 11 provided to the intake conduit of an engine outputs an analog voltage corresponding to a flow rate. This analog voltage is converted by a V/F converter 9 into a pulse train having the number of cycles proportional to the analog voltage. A microcomputer which counts data incorporates a free-running counter (FRC) 5 which measures time and an input capture register (ICR) 6 which holds the value of the FRC when the edge of a gate is generated. The counter 2 counts the pulses which are converted by a V/F converter 9. Further, a D latch 4 synchronizes the gate for sampling with the leading edges of the pulses. The time width of plural pulse trains is measured to calculate the mean period of one pulse and an intake air amount is calculated based upon the mean period.

8. 发明专利

JPH06272602A ENGINE CONTROLLER 失效
公开(公告)号：JPH06272602A
公开(公告)日：1994-09-27
申请号：JP5838593
申请日：1993-03-18
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： YAMADA SHIGEKI , SHIDA MASAMI
IPC分类号： F02D29/00 , F02D41/04 , F02D45/00
摘要： PURPOSE:To enable an automatic transmission and a manual transmission to be use in common two kinds of control program constant for an automatic transmission and a manual transmission with in the same engine, and discriminating the kind of transmission under the operational condition of the engine. CONSTITUTION:A program control constant for automatic transmission and a program control constant for manual transmission are stored inside the same engine controller. Signals from various kinds of sensors 2, 3 are inputted in a CPU 7 for performing digital process of various kinds of data required for engine rotation via an input/output interface circuit 4, and various kinds of control signals required for the engine rotation are outputted based on these signals in compliance with the program stored in a ROM 5. The kind of transmission is judged by the operational condition, and as a result, the program control constant for the appropriate transmission is used for engine control. Consequently, one of the two kinds of program control constants can be used.

9. 发明专利

JPH04348505A SOLENOID DRIVING CIRCUIT 失效
公开(公告)号：JPH04348505A
公开(公告)日：1992-12-03
申请号：JP12088191
申请日：1991-05-27
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： HAYASHIBARA TOSHIO , SHIDA MASAMI
IPC分类号： H01F7/18
摘要： PURPOSE:To control a valve-opening time of a solenoid with excellent precision and enhance control ability by a method wherein a detecting circuit for detecting a current flowing in a load and a mechanism for seeking for a time difference between an output of a comparing circuit and an output of a driving circuit are provided and a delay time in which the solenoid becomes nonconducting is measured and corrected. CONSTITUTION:A solenoid SOL having inductance is driven by a power MOSFET TR, and further the power MOSFET TR is driven by a microcomputer CPU provided with built-in ROM & RAM through a resistance R1. A computer COMP has a predetermined threshold level by resistances R2, R3, R4, R5. A time T1 elapsed from a rise time of E1 to a fall time of E3 is a valve- opening time delay of the solenoid SOL. IL starts falling, does not reach 0 at once, and falls up to I2, and it takes a time T2 until E3 reaches L0. The T2 is valve-closing time delay of the solenoid SOL.

10. 发明专利

JPH04321754A ELECTRONIC CONTROL APPARATUS FOR VEHICLE 失效
公开(公告)号：JPH04321754A
公开(公告)日：1992-11-11
申请号：JP9193391
申请日：1991-04-23
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： TSURUMAKI KIYOSHI , SHIDA MASAMI
IPC分类号： F02D41/22 , F02D45/00 , G01M15/00 , G01M15/04
摘要： PURPOSE:To shorten the inspection time length of a back-up circuit during a shipping test of a micro-electronic control apparatus having a CPU back-up circuit based on a gate array. CONSTITUTION:A back-up circuit 10 controls a fuel injection device 3 and so on instead of CPU 11 when the CPU 11 is considered in abnormality on the basis of a reset signal 12a from a reset circuit 12 having a watch-dock function. Within this back-up circuit is provided a test circuit which is brought to a test mode by a test switch 9 when a shipping test is performed. When inspection of the back-up circuit is conducted during a shipping test of the control apparatus, the inspection time length can be thus shortened by this test circuit.

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