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1. 发明专利

DE10028570B4 未知
公开(公告)号：DE10028570B4
公开(公告)日：2004-05-13
申请号：DE10028570
申请日：2000-06-09
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： NAKAGAWA SHINJI , ISHII TOSHIO , TAKAKU YUTAKA , OHSUGA MINORU , TAKAMURA HIROYUKI
IPC分类号： F02D41/14

2. 发明专利

DE69621965T2 未知
公开(公告)号：DE69621965T2
公开(公告)日：2003-02-06
申请号：DE69621965
申请日：1996-02-13
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： AGUSTIN ROGELIO B , NUMATA AKIHITO , FUKUCHI EISAKU , TAKAKU YUTAKA , ISHII TOSHIO
IPC分类号： F02B77/08 , F01N3/20 , F01N3/24 , F01N11/00 , F01N13/02 , F02D41/14 , F02D45/00 , F01N7/00
摘要： A diagnostic apparatus (11) for exhaust gas clarification apparatus for internal combustion engine is disclosed. The diagnostic apparatus can diagnoses the individual catalyst independently by means that an air/fuel ratio sensor is mounted before (6,7) and after (7,8) the individual catalyst (9,10), and that the individual catalyst (9,10) is diagnosed by estimating the correlation of the output signals from the air/fuel ratio sensors mounted before and after the individual catalyst, and furthermore, that the individual diangosis operation is performed at distinctive operation regions adequate for their corresponding diagnostic mode.

3. 发明专利

DE19620417C2 未知
公开(公告)号：DE19620417C2
公开(公告)日：2001-02-15
申请号：DE19620417
申请日：1996-05-21
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： AGUSTIN ROGELIO B , NUMATA AKIHITO , KAWANO KAZUYA , TAKAKU YUTAKA , ISHII TOSHIO
IPC分类号： F02D45/00 , F01N3/20 , F01N3/24 , F01N11/00 , F01N13/02 , F02D41/14 , F02D41/22 , G01M15/00
摘要： A diagnosing system of a catalytic converter in an internal combustion engine has a detecting unit to detect an operating state of the engine and an air/fuel ratio control unit to adjust a fuel injection amount so as to keep an air/fuel ratio of a mixture that is inhaled into the engine to a target value. The operating state of the engine is detected, whereby it is confirmed that the engine lies in a predetermined operating region to execute a catalyst diagnosis on the basis of the detected operating state. In each of a plurality of different catalyst diagnosis regions, the performance of the catalytic converter or the performance of the catalytic converter array is diagnosed on the basis of the output signal of the first exhaust gas component sensor arranged on the upstream side of the catalytic converter array and the output signal of the second exhaust gas component sensor arranged on the downstream side.

4. 发明专利

DE10028570A1 Control of the fuel-air ratio at the inlet to an automotive catalytic converter by use of a feedback controller for the mixture supplied to the engine and an additional controller for the air-fuel ratio at the converter inlet 未知
公开(公告)号：DE10028570A1
公开(公告)日：2000-12-14
申请号：DE10028570
申请日：2000-06-09
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： NAKAGAWA SHINJI , ISHII TOSHIO , TAKAKU YUTAKA , OHSUGA MINORU , TAKAMURA HIROYUKI
IPC分类号： F02D41/14
摘要： Control of the air-fuel ratio at the inlet (10) to a catalytic converter (11) is via two controllers, the first of which controls the air-fuel ratio at the engine (9) inlet, based on one or more oxygen sensors in the converter inlet, converter itself or its outlet and the second of which controls the air-fuel ratio at the inlet (10) to the converter if the first controller has overcompensated. The control mechanism of the first controller is a feedback mechanism, the second controls the operation of a substance for capturing or releasing oxygen in the atmosphere prior to the converter. An Independent claim is made for a procedure for controlling the air-fuel ratio at the inlet to a catalytic converter.

5. 发明专利

DE69414941T2 未知
公开(公告)号：DE69414941T2
公开(公告)日：1999-08-05
申请号：DE69414941
申请日：1994-09-07
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： NUMATA AKIHITO , MUKAIHIRA TAKASHI , ISHII TOSHIO , TAKAKU YUTAKA , KAWANO KAZUYA
IPC分类号： F01N3/20 , F01N11/00 , F02B77/08 , F02D41/14 , F02D41/22 , G01M15/04 , G01N27/26 , F01N7/00
摘要： Provided is an internal combustion engine (1) malfunction diagnosis apparatus capable of diagnosising the deterioration of an internal combustion engine (1) with a high accuracy and capable of diagnosising deterioration of a fluctuation factor detection section of the engine (1) with a high accuracy in irrespective of the engine speed. According to one embodiment of the present invention, there is provided a malfunction diagnosis apparatus for an internal combustion engine comprises: a crank angle detection sensor (25) for detecting a crank angle of the internal combustion engine (1); a fluctuation factor measurement means (3) for measuring a state of a fluctuation factor of the internal combustion engine; an angular-based data sampling section (14A,14B) for sampling data of an output signal from the fluctuation factor measurement means (3) at a predetermined rotation angle of a crank shaft in accordance with a crank angle signal from the crank angle detection sensor (25); a malfunction judgement section (17) for judging a malfunction of the internal combustion engine (1) on the basis of data sampled by the angular-based data sampling section (14A,14B); a time-based data sampling section (21) for sampling an output signal from the fluctuation factor measurement means (3) at every lapse of a predetermined constant time; and a fluctuation factor measurement means deterioration judgement section (28) for judging deterioration of the fluctuation factor measurement means (3) on the basis of data sampled by the time-based data sampling section (21).

6. 发明专利

DE69621965D1 未知
公开(公告)号：DE69621965D1
公开(公告)日：2002-08-01
申请号：DE69621965
申请日：1996-02-13
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： AGUSTIN ROGELIO B , NUMATA AKIHITO , FUKUCHI EISAKU , TAKAKU YUTAKA , ISHII TOSHIO
IPC分类号： F02B77/08 , F01N3/20 , F01N3/24 , F01N11/00 , F01N13/02 , F02D41/14 , F02D45/00 , F01N7/00
摘要： A diagnostic apparatus (11) for exhaust gas clarification apparatus for internal combustion engine is disclosed. The diagnostic apparatus can diagnoses the individual catalyst independently by means that an air/fuel ratio sensor is mounted before (6,7) and after (7,8) the individual catalyst (9,10), and that the individual catalyst (9,10) is diagnosed by estimating the correlation of the output signals from the air/fuel ratio sensors mounted before and after the individual catalyst, and furthermore, that the individual diangosis operation is performed at distinctive operation regions adequate for their corresponding diagnostic mode.

7. 发明专利

DE69414941D1 未知
公开(公告)号：DE69414941D1
公开(公告)日：1999-01-14
申请号：DE69414941
申请日：1994-09-07
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： NUMATA AKIHITO , MUKAIHIRA TAKASHI , ISHII TOSHIO , TAKAKU YUTAKA , KAWANO KAZUYA
IPC分类号： F01N3/20 , F01N11/00 , F02B77/08 , F02D41/14 , F02D41/22 , G01M15/04 , G01N27/26 , F01N7/00
摘要： Provided is an internal combustion engine (1) malfunction diagnosis apparatus capable of diagnosising the deterioration of an internal combustion engine (1) with a high accuracy and capable of diagnosising deterioration of a fluctuation factor detection section of the engine (1) with a high accuracy in irrespective of the engine speed. According to one embodiment of the present invention, there is provided a malfunction diagnosis apparatus for an internal combustion engine comprises: a crank angle detection sensor (25) for detecting a crank angle of the internal combustion engine (1); a fluctuation factor measurement means (3) for measuring a state of a fluctuation factor of the internal combustion engine; an angular-based data sampling section (14A,14B) for sampling data of an output signal from the fluctuation factor measurement means (3) at a predetermined rotation angle of a crank shaft in accordance with a crank angle signal from the crank angle detection sensor (25); a malfunction judgement section (17) for judging a malfunction of the internal combustion engine (1) on the basis of data sampled by the angular-based data sampling section (14A,14B); a time-based data sampling section (21) for sampling an output signal from the fluctuation factor measurement means (3) at every lapse of a predetermined constant time; and a fluctuation factor measurement means deterioration judgement section (28) for judging deterioration of the fluctuation factor measurement means (3) on the basis of data sampled by the time-based data sampling section (21).

8. 发明专利

DE19620417A1 Catalytic converter diagnosis using multiple catalysts 未知
公开(公告)号：DE19620417A1
公开(公告)日：1996-11-28
申请号：DE19620417
申请日：1996-05-21
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： AGUSTIN ROGELIO B , NUMATA AKIHITO , KAWANO KAZUYA , TAKAKU YUTAKA , ISHII TOSHIO
IPC分类号： F02D45/00 , F01N3/20 , F01N3/24 , F01N11/00 , F01N13/02 , F02D41/14 , F02D41/22 , G01M15/00
摘要： An engine diagnostic system with catalytic converters for monitoring the exhaust gases of a motor vehicle consists of detectors (1, 17, 20) for checking the performance and condition of the engine and an air/fuel ratio control unit (3) for adjusting the fuel injection to achieve the targetted air/fuel ratio. Two catalytic converters (8, 9) containing multiple catalysts are set one after the other in a section of the exhaust system (5, 16). One exhaust gas sensor (6) is positioned in front of these and another sensor (7) after them. Diagnostic equipment (11, 12, 13) correlates the output signals of the sensors, in accordance with the performance criteria of the engine, to assess its supply and the functioning of the converters. From this, information is fed back to the fuel injection control to effect air/fuel ratio adjustment.

9. 发明专利

JP2000352338A AIR-FUEL RATIO CONTROL SYSTEM FOR ENGINE AND METHOD OF THE SAME 失效
公开(公告)号：JP2000352338A
公开(公告)日：2000-12-19
申请号：JP16344299
申请日：1999-06-10
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： NAKAGAWA SHINJI , ISHII TOSHIO , TAKAKU YUTAKA , OSUGA MINORU , TAKAMURA HIROYUKI
IPC分类号： F02D41/14
摘要： PROBLEM TO BE SOLVED: To enable prompt reduction of emission by controlling an air-fuel ratio upstream of a catalyst within a predetermined purification range after correcting it excessively richer than the predetermined purification range when an output of air-fuel ratio detection means located downstream of the catalyst deviates from a predetermined range and becomes lean. SOLUTION: When an engine is operated and an air-fuel ratio downstream of a catalyst 11 interposed in an exhaust system becomes leaner than a high efficiency purification range, a control unit 18 controls supply of an air-fuel mixture into the catalyst so as to maximize a reaction speed in the catalyst 11. Namely, a richer gas than a stoichiometric air-fuel ratio is fed into the catalyst to purge O2 captured by ceria, an auxiliary catalyst in the catalyst 11, and a reduction atmosphere is enhanced promptly. Therefore, emission of NOx deteriorated during the lean condition can be corrected promptly. During the correction, when an air-fuel ratio downstream of the catalyst becomes richer than the high efficiency purification range, a leaner gas is fed to make ceria capture O2 and a reduction atmosphere in the catalyst is enhanced promptly.

10. 发明专利

JP2002201996A CONTROLLER OF INTERNAL COMBUSTION ENGINE HAVING VALVE OPENING CHARACTERISTIC ADJUSTING DEVICE 失效
公开(公告)号：JP2002201996A
公开(公告)日：2002-07-19
申请号：JP2001000598
申请日：2001-01-05
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： YOKOYAMA MAKOTO , TAKAKU YUTAKA , ISHIKURA HISATSUGU , OSAKI SATORU
IPC分类号： F01L1/34 , F01L13/00 , F02D13/02 , F02D45/00
摘要： PROBLEM TO BE SOLVED: To provide a controller of an internal combustion engine having a valve opening characteristic adjusting device capable of properly determining the abnormality of the valve opening characteristic adjusting device in a case when the clogging and the collapsing of an oil passage, and the abnormality such as the increase of friction occur, even in the controller of the internal combustion engine capable of compensating the delay in response to the valve opening characteristic adjusting device. SOLUTION: In this controller of the internal combustion engine having the opening characteristic adjusting device for an intake valve and/or an exhaust valve, the controller comprises a means for calculating a target spark advance value of the valve, a means for calculating an actual spark advance value of the valve, a driving output calculating means for calculating the driving output of the valve opening characteristic adjusting device, a correction value calculating means for calculating a correction value for correcting the driving output on the basis of the target spark advance value and the actual spark advance value, and an abnormality determining means for determining the abnormality of the valve opening characteristic adjusting device, and the abnormality determining means determines the abnormality of the valve opening characteristic adjusting device on the basis of the correction value calculated by the correction value calculating means.

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