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1. 发明专利

DE4206809A1 Knocking detector for IC engine - has digital frequency analyser supplied by vibration signals picked up from sensor for engine and=or cylinder internal pressure vibration 未知
公开(公告)号：DE4206809A1
公开(公告)日：1992-09-10
申请号：DE4206809
申请日：1992-03-04
申请人： HITACHI LTD
发明人： KITANO KOUJI , KAYANO MITSUO , KANEYASU MASAYOSHI , KATOUGI KOUZOU , ICHIHARA TAKANOBU , KURIHARA NOBUO
IPC分类号： F02B77/08 , F02D45/00 , F02P5/152 , F02P5/153 , G01L23/22
摘要： An a-d converter (28) picks-up the vibration signals produced by the sensor (1) at sequential intervals during the firing stroke of the I.C engine. A c.p.u. (25) processes the picked-up vibration signals for digital frequency analysis and to calculate the knock indices on the basis of the set main frequency components. The c.p.u. compares the largest calculated knock index with a preset threshold value provided by a background vibration level and a top level in order to detect the occurence of knocking. The engine vbibration pick-up block comprises an amplifier (26), a band-pass filter (27) and the a-d converter. The sensor (1), a crankshaft reference position sensor (2), air flow rate sensor (4). ADVANTAGE - High signal-to-noise ratio and sensitivity. Copes with heavy loads and high r.p.m. of engine.

2. 发明专利

DE4206809C2 未知
公开(公告)号：DE4206809C2
公开(公告)日：1995-10-05
申请号：DE4206809
申请日：1992-03-04
申请人： HITACHI LTD
发明人： KITANO KOUJI , KAYANO MITSUO , KANEYASU MASAYOSHI , KATOUGI KOUZOU , ICHIHARA TAKANOBU , KURIHARA NOBUO
IPC分类号： F02B77/08 , F02D45/00 , F02P5/152 , F02P5/153 , G01L23/22 , G01H1/00 , G01M15/00 , F02D41/00
摘要： Knocking detecting in an internal combustion engine uses, a vibration sensor detecting engine vibrations; and insert for taking-in output vibration signals from the vibration sensor in a plurality of intervals in a time sequential manner during every explosion stroke of the internal combustion engine; performing a digital frequency analysis on the taken-in output vibration signals in the respective sequential intervals; setting a main resonance frequency necessary for knocking occurrence judgement based upon the instant operating condition of the internal combustion engine; calculating knocking indexes for the digital frequency-analyzed output vibration signals in the respective sequential intervals based upon the set main resonance frequency component; comparing the largest knocking index calculated with a predetermined threshold value determined by a background vibration level and a slice level thereof to determine occurrence of knocking; and renewing the respective background vibration levels using the calculated knocking indexes when no knocking occurrence is determined. With such an operation a knocking detection with a high S/N ratio and a high sensitivity is achieved.

3. 发明专利

JPH0965456A VOLTAGE LEVEL CONVERSION CIRCUIT FOR MULTIPLEX COMMUNICATION PATH FOR AUTOMOBILE 失效
公开(公告)号：JPH0965456A
公开(公告)日：1997-03-07
申请号：JP21441595
申请日：1995-08-23
申请人： HITACHI LTD
发明人： KATOUGI KOUZOU , ADACHI MASAHIRO
IPC分类号： G08C15/06 , G05B15/02 , H03K19/0175 , H04L25/02 , H04Q9/00
摘要： PROBLEM TO BE SOLVED: To attain voltage conversion in an accurate timing by inhibiting the reception of a communication path of an opposite party so that the output signal of a voltage level conversion circuit connecting to communication paths with different voltage levels is not returned to an original reception signal side. SOLUTION: A CPU 101 of an engine controller 100 uses an I/O 103 to diagnose sensors and actuators and receives an instruction signal from a tester 201 to provide the output of count and diagnosis results. A voltage level conversion circuit 110 is provided between communication paths of different voltage levels, and a reception inhibit circuit 113 stops signal reception and start of a communication path occupancy time timer 116 while a signal from the opposite party stays on the communication paths and a reception permission circuit 114 inhibits a signal output while its own signal stays on the communication paths. Thus, the reception of its own transmission signal is avoided and complicated software processing for signal discrimination is not required and the processing is simplified.

4. 发明专利

JPH08292132A METHOD FOR DISPLAYING SELF DIAGNOSTIC RESULT OF ENGINE CONTROLLER 失效
公开(公告)号：JPH08292132A
公开(公告)日：1996-11-05
申请号：JP9922595
申请日：1995-04-25
申请人： HITACHI LTD
发明人： KATOUGI KOUZOU , NAGAI YASUHITO
IPC分类号： G01M15/04 , F02D45/00 , G01M15/00
摘要： PURPOSE: To surely perform priority control in signals between devices by detecting collision of transmitting data when a transmitting signal and a receiving signal of serial signals do not agree with each other or when a framing error occurs. CONSTITUTION: An engine controller 101 and a transmission controller 102 are connected to a K-line which is a connection line with a generic scanning tool GST) by a wired OR and coupled to GST. Start stop synchronization type data transmission is performed by taking potential of voltage VB or a ground GND in a state where K-line is pulled up. Collision of transmitting data is detected when a transmitting signal and a receiving signal of the serial signals do not agree with each other or when a framing error occurs. Thereby since a result of self diagnosis can be known through a plurality of controllers and one transmission line, hardware can be simplified and unified data processing can be performed.

5. 发明专利

JPH07119446A DIAGNOSING DEVICE FOR EXHAUST EMISSION CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH07119446A
公开(公告)日：1995-05-09
申请号：JP26455493
申请日：1993-10-22
申请人： HITACHI LTD
发明人： KATOUGI KOUZOU , TAKAKU YUTAKA , ISHII TOSHIO
IPC分类号： G01M15/04 , F01N3/20 , F02D41/14 , F02D45/00 , G01M15/00
摘要： PURPOSE:To shorten a diagnosis by a method wherein the degrees of deterioration of catalysts in exhaust routes are simultaneously diagnosed based on a detecting signal from a downstream oxygen density sensor in a given running area when the degree of deterioration of the catalyst based on detecting signals from two oxygen density sensors arranged in respective positions situated upper stream and downstream from the catalyst. CONSTITUTION:An airflow sensor 109 and an ISCV(Idle Speed Control Valve) 111 are disposed in the intake air passage 107 of an engine body 101. Meanwhile, in an exhaust passage 115, oxygen density (air-fuel ratio) sensors 118 and 119 are disposed in respective positions situated upper stream and downstream from a catalyst 117. Based on detecting signals detecting signals from sensors 102, 104, and 106 to respectively detect the running state of an engine body 101 in addition to detecting signals from the sensors 109, 118, and 119, an ignition plug 113, an injector 114, and the ISCV 111 are controlled by a control unit 112. In this case, in a given running area, the degree of deterioration of the catalyst 117 and diagnosis of the exhaust route are simultaneously realized based on a detecting signal from the downstream oxygen density sensor 119.

6. 发明专利

JPH05149189A COMBUSTION STATE DIAGNOSING DEVICE FOR ENGINE 失效
公开(公告)号：JPH05149189A
公开(公告)日：1993-06-15
申请号：JP23997691
申请日：1991-09-19
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： TAKAKU YUTAKA , KATOUGI KOUZOU , ISHII TOSHIO , ODA KAZUMASA , NISHIO HARUYUKI
IPC分类号： F02B77/08 , F02D45/00
摘要： PURPOSE:To perform proper diagnosis of a combustion state regardless of a detection error for various state amounts by providing a means by which the start of measurement of a state amount and a measuring interval are set so that a difference between the value at a normal operation period and the value at an abnormal operation period of a combustion state parameter for deciding a combustion state is maximized. CONSTITUTION:An engine control device 9 inputs respective detecting signals from a reference sensor 12 and a position sensor 18 and after given computing processing is performed, a control signal is outputted to a lamp 19 for alarming the occurrence of a miss fire. In this case, in the engine control device 9, the measurement starting state and the measuring interval of a state amount by which a given combustion state parameter set so that various differences between a value at a normal combustion state period and a value at a miss fire period is maximized are stored in a memory 92. Meanwhile, from the stored measurement starting state, a state amount of the measuring interval is measured by means of sensors 12 and 18 and other devices 96a, 98a, and 99..., a combustion state parameter is determined and from the measured state amount, a combustion state is decided from the combustion state parameter by a CPU 91 and the memory 92.

7. 发明专利

JPH0571401A FUEL CONTROLLER AND MISFIRE DETECTOR FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH0571401A
公开(公告)日：1993-03-23
申请号：JP22783791
申请日：1991-09-09
申请人： HITACHI LTD
发明人： ICHIHARA TAKANOBU , KATOUGI KOUZOU , SHIRAISHI TAKASHI
IPC分类号： F02D41/32 , F02D45/00
摘要： PURPOSE:To detect a lean mixture limit (a varied torque allowable limit) of an internal combustion engine so that driving is allowed around the lean mixture limit all times independently from the type of fuel and the individual difference of the engine to improve fuel performance. CONSTITUTION:A vibration detecting means 2 to detect the vibration of an internal combustion engine, a varied torque detecting means 4 to detect the varied torque of the engine with signals output from the vibration detecting means 2 and a fuel supply setting means 5 to set fuel supply in response to the output of the varied torque detecting means 4 are provided. As a result, driving is allowed around a lean mixture limit all times independently from the type of fuel and the individual difference of the engine to improve fuel consumption performance.

8. 发明专利

JPH04186135A KNOCKING DETECTOR DEVICE 失效
公开(公告)号：JPH04186135A
公开(公告)日：1992-07-02
申请号：JP31387990
申请日：1990-11-21
申请人： HITACHI LTD
发明人： KAYANO MITSUO , KITANO KOJI , KANEYASU MASAMI , KATOUGI KOUZOU , ICHIHARA TAKANOBU
IPC分类号： G01H17/00 , F02D45/00 , G01M15/00
摘要： PURPOSE:To allow the highly sensitive detection by providing an AGC circuit using a microcomputer which conducts such a proper gain control that the presence of a fine knocking generation can be detected in all operating states of an internal combustion engine. CONSTITUTION:An AGC circuit 2 amplifies the output of a vibration sensor 1 for detecting the vibration of an internal combustion engine. A BPF 3 separates the output in a band containing the characteristic frequency component of knocking. A microcomputer 13 reads the operating state factors of the internal combustion engine such as engine rotating speed and engine load to determine the gain. According to this gain, a binary signal of 1.0 is outputted from the output port of the microcomputer 13. An analog switch 14 is on/off by this signal, the composite resistance value of resistance R1-R4 is changed, and the output of an amplifier 15 is changed by the ratio of the composite resistance value to a resistance R5. At this time, the gain can be controlled linearly or non-linearly by the resistances R1-R5 or the map value of a soft wear. When the number of output ports of the microcomputer 13 is increased, the control can be performed in a wide range.

9. 发明专利

JPH04152238A ENGINE KNOCKING SENSING DEVICE 失效
公开(公告)号：JPH04152238A
公开(公告)日：1992-05-26
申请号：JP27634390
申请日：1990-10-17
申请人： HITACHI LTD
发明人： KATOUGI KOUZOU , ICHIHARA TAKANOBU
IPC分类号： G01M15/00 , F02D45/00 , F02P5/15 , F02P5/152 , F02P5/153
摘要： PURPOSE:To enhance the knocking sensing ability and widen the operating range with controllability for knocking by performing the knock sensing for each of a plurality of knocking vibration modes. CONSTITUTION:Among signals given from a seat pressure sensor 3 and a knock vibration sensor 4, e.g. the range 6-18 kHz is amplified, and at the same time, A/D conversion is performed. The result from A/D conversion is temporarily sent to a RAM 1 to undergo frequency analysis at every 2 pieces accumulated, and the result is forwarded to another RAM 2. The calculational result for each frequency is multiplied with a correction factor to serve correcting the sensitivity, and then knock judgement is made - if three or more components are judged as knocking, a signal is given to inform that there is a knock. Thereby the knocking sensing ability is enhanced, and the operating range with controllability for knocking can be widened.

10. 发明专利

JPS63212765A IGNITION DEVICE FOR ENGINE 失效
公开(公告)号：JPS63212765A
公开(公告)日：1988-09-05
申请号：JP4266387
申请日：1987-02-27
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： KATOUGI KOUZOU , WATANABE AKITO
IPC分类号： F02P5/15
摘要： PURPOSE:To obtain a circuit securing the sufficient excitation time for each ignition coil by counting the crank angle signal independently with a counter provided for each cylinder in a microcomputer circuit and exciting each ignition coil. CONSTITUTION:An IC 4 controlling the excitation time for an ignition coil incorporates multiple counters and registers and counts the signal of a crank angle sensor. Also it has multiple ignition output terminals (i), (ii)-(n) corresponding to individual cylinders, a counter corresponding to each cylinder is compared with one comparison register for the size, and as a result if the value of the counter is lower than that of the comparison register, the excitation of the ignition coil is stopped by transistors Tr1-Trn, if it coincides with the comparison register, the excitation i started. If the excitation is stopped when the crank angle reaches the preset ignition timing, the energy stored in the ignition coil becomes a spark. Accordingly, the control IC itself of a microcomputer circuit acts like a distributing circuit, thus the ignition period can be shortened, and an ignition device suitable for high-speed rotation can be obtained.

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