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1. 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.

2. 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).

3. 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.

4. 发明专利

DE69826543T2 未知
公开(公告)号：DE69826543T2
公开(公告)日：2006-02-16
申请号：DE69826543
申请日：1998-02-17
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： FUKUCHI EISAKU , NUMATA AKIHITO , ICHIHARA TAKANOBU
IPC分类号： G01M15/04 , F02D41/00 , F02D41/14 , F02D41/34 , F02D45/00 , G01M15/00 , G01M15/11 , G05B11/36
摘要： A combustion state detection system for an internal combustion engine in which a timing signal associated with the rotation of the crankshaft by a predetermined angle is detected and corrected, and a combustion state parameter is calculated from the timing signal. Further, the deviation of the calculated combustion state parameters for normal combustion is detected between the cylinders, and the correction amount of the timing signal is calculated. A reference cylinder is determined by the means (706, 707) for detecting the deviation. The deviation is detected between the combustion state parameter for normal combustion of the reference cylinder and the cylinder opposed thereto and the combustion state parameter for normal combustion of the remaining cylinders. The correction amount is calculated in such a manner as to control the correction amount to not more than a predetermined value or to zero from the detected deviation.

5. 发明专利

DE19635926C2 未知
公开(公告)号：DE19635926C2
公开(公告)日：2000-10-12
申请号：DE19635926
申请日：1996-09-04
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： FUKUCHI EISAKU , NUMATA AKIHITO , ICHIHARA TAKANOBU , ISHII TOSHIO
IPC分类号： F02D45/00 , F02D41/14 , G01M15/11 , G01M15/00 , G01P3/44
摘要： It is intended to detect combustion state of an internal combustion engine over the entire range where positive torque is generated. Time required from a predetermined first crank angle to a second crank angle is measured by detecting a rotation angle of a ring gear or plate with engine speed detecting means 101. Then, a combustion state parameter is calculated from said required time by combustion state detecting means 102 with an established calculation method, and combustion state is determined by combustion state judging means 103. Engine speed correction means 104 determines and feeds back a correction value for the combustion state detecting value to correct the engine speed. At the moment, the correction quantity for correcting the required time is varied so that the normal combustion value of said combustion state parameter is at a predetermined value or less, or within a predetermined range. When the combustion state parameter reaches a value indicating misfire, update of the correction value is inhibited for a prescribed duration before and after it.

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

DE19635926A1 Detector of state of combustion throughout range of operation of engine 未知
公开(公告)号：DE19635926A1
公开(公告)日：1997-03-06
申请号：DE19635926
申请日：1996-09-04
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： FUKUCHI EISAKU , NUMATA AKIHITO , ICHIHARA TAKANOBU , ISHII TOSHIO
IPC分类号： F02D45/00 , F02D41/14 , G01M15/11 , G01M15/00 , G01P3/44
摘要： The detector times (101) the rotation of the crankshaft between two predetermined angular positions as a basis for calculation (102) of a parameter used in the determination (103) of the combustion state. A correction to the output from the timer is worked out (104) and fed back to obtain the true engine speed. The correction is varied so that the normal combustion value is less than or equal to a predetermined standard or lies within a predetermined range. In the event of misfiring, application of the correction is suspended for a prescribed interval.

9. 发明专利

DE69826543D1 未知
公开(公告)号：DE69826543D1
公开(公告)日：2004-11-04
申请号：DE69826543
申请日：1998-02-17
申请人： HITACHI LTD , HITACHI CAR ENG CO LTD
发明人： FUKUCHI EISAKU , NUMATA AKIHITO , ICHIHARA TAKANOBU
IPC分类号： G01M15/04 , F02D41/00 , F02D41/14 , F02D41/34 , F02D45/00 , G01M15/11 , G05B11/36 , G01M15/00
摘要： A combustion state detection system for an internal combustion engine in which a timing signal associated with the rotation of the crankshaft by a predetermined angle is detected and corrected, and a combustion state parameter is calculated from the timing signal. Further, the deviation of the calculated combustion state parameters for normal combustion is detected between the cylinders, and the correction amount of the timing signal is calculated. A reference cylinder is determined by the means (706, 707) for detecting the deviation. The deviation is detected between the combustion state parameter for normal combustion of the reference cylinder and the cylinder opposed thereto and the combustion state parameter for normal combustion of the remaining cylinders. The correction amount is calculated in such a manner as to control the correction amount to not more than a predetermined value or to zero from the detected deviation.

10. 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.

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