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1. 发明专利

JPH094494A DEVICE FOR DIAGNOSING ABNORMALITY OF AIR-FUEL RATIO CONTROL SYSTEM FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH094494A
公开(公告)日：1997-01-07
申请号：JP15801595
申请日：1995-06-23
申请人： NIPPON DENSO CO
发明人： OKAMOTO YOSHIYUKI , IIDA HISASHI , KAJI TAKASHI
IPC分类号： F02D45/00 , F02D41/14 , F02D41/22 , G01N27/26
摘要： PURPOSE: To accurately diagnose the abnormality of a limiting current type air-fuel ratio sensor. CONSTITUTION: In the case where the F/B starting prerequisite is established, activity/ inactivity of an air-fuel ratio sensor is judged (101, 102), and in the case of inactivity, the inactive condition continuation time is counted by an inactive condition continuation counter (103), and a judgment whether an active judgment realizing flag is turned ON or not, namely, a judgment whether at least one active judgment is realized or not after the engine is started is performed. At this stage, when 'YES' is judged, the continuation time of the inactive condition is detected, and in the case where the inactive conditioned is continued more than a third predetermined time, active failure is judged, and an active failure flag is turned ON (105, 106). On the other hand, in the case where the active judgment is not realized yet after the engine is started, the inactive condition continuation time is counted by an inactive condition continuation time counter, and in the case where the inactive condition is continued more than a sixth predetermined value, abnormality of a heater circuit or abnormality of an air-fuel ratio sensor system except for the heater circuit is judged.

2. 发明专利

JPH062582A FUEL INJECTION DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH062582A
公开(公告)日：1994-01-11
申请号：JP18144992
申请日：1992-07-09
申请人： NIPPON DENSO CO
发明人： IKUTA KENJI , IIDA HISASHI , TAKAHASHI TAKANORI
IPC分类号： F02D41/04 , F02D31/00 , F02D41/08 , F02D41/34 , F02D45/00
摘要： PURPOSE:To adjust supply of intake air by a single opening/closing means so as to simplify control by providing the opening/closing means, synchronized with fuel injection to open, in an air pipe line of supplying partly the intake air to a fuel injection part to detour around a throttle valve, and further correcting an opening time so as to hold a predetermined idle speed. CONSTITUTION:An air mixture device 3 of an engine 2 is constituted of an air mixture pipe line 27 for introducing partly intake air from the upstream of a throttle valve 14 of an intake pipe 12 fed to a fuel injection valve 26 and an air control valve 28 opened/closed in accordance with control of an ECU4 to connect/disconnect the air mixture pipe line 27. In the ECU4, arm opening condition of the air control valve 28 is maintained almost synchronized with an opening time of the fuel injection valve 26, and the valve opening time is corrected so as to maintain a predetermined idle speed. The ECU4 is only required to control the single air control valve 28, and a control content is simplified to reduce a manufacturing cost of the ECU.

3. 发明专利

JPH05187332A CONTROLLER FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH05187332A
公开(公告)日：1993-07-27
申请号：JP18656292
申请日：1992-07-14
申请人： NIPPON DENSO CO
发明人： MORIKAWA JUNYA , IIDA HISASHI , ISOMURA SHIGENORI
IPC分类号： F02B77/08 , F02D31/00 , F02D41/00 , F02M25/08 , G01M15/04
摘要： PURPOSE:To detect the condition of a purge control valve surely by providing an electronic control circuit, and utilizing an idle engine speed control means which adjusts the amount of suctioned air of engine effectively so as to achieve the target engine speed during idle operation of engine. CONSTITUTION:An electronic control circuit 25 controls the amount of suctioned air by adjusting degree of opening of an engine speed control valve 8 so as to achieve the target engine speed during idle operation of an engine 1. At the same time, when air-fuel ratio of mixer to engine 1 which is detected by an O2 sensor 12 is controlled to a constant ratio, a purge control valve 23 is forcedly changed into fully opened condition and the predetermined degree of opening condition. The amount of change of degree of opening of engine speed control valve 8 at that time is obtained. When the amount of change of degree of opening is deviated from the previously determined scope of allowance, it is judged that an abnormality has occurred, and an alarm lamp 38 is lit to give an alarm. Thus, it is possible to detect reduction of purge capacity of purge system.

4. 发明专利

JPH03121216A PRESSURE DETECTING DEVICE 失效
公开(公告)号：JPH03121216A
公开(公告)日：1991-05-23
申请号：JP26069989
申请日：1989-10-05
申请人： NIPPON DENSO CO
发明人： IIDA HISASHI
IPC分类号： F02B77/08 , F02D35/00
摘要： PURPOSE:To keep the temperature of an air reservoir equal to the intake air temperature to prevent faulty detection due to dew condensation, by forming the reservoir in an intake pipe of an internal combustion engine through a throttle-hole, and connecting both ends of an intake air conduit pipe respectively to a pressure detecting device body and the air reservoir. CONSTITUTION:Intake air of an engine 10 is introduced into a cylinder through an air cleaner 13, a throttle valve 14, and a surge tank 15 forming a part of an intake pipe 12. Intake air pressure in the surge tank 15 is detected by a pressure detecting device 18. In this case, the pressure detecting device 18 is formed as follows: the upper wall of the surge tank 15 is partitioned by a wall material 19a to form an air reservoir 19. To the air reservoir 19, the surge tank 15 is connected through a throttle-hole 20 formed in the wall material 19a and a pressure detecting device body 32 through an intake air conduit pipe 33. The temperature of the air reservoir 19 is thus kept equal to the intake air temperature of the engine 10 to prevent dew condensation.

5. 发明专利

JPH08270482A ABNORMALITY DIAGNOSTIC DEVICE FOR AIR-FUEL RATIO SENSOR 失效
公开(公告)号：JPH08270482A
公开(公告)日：1996-10-15
申请号：JP7633695
申请日：1995-03-31
申请人： NIPPON DENSO CO
发明人： YAMASHITA YUKIHIRO , IIDA HISASHI , KOSAKA YASUO
IPC分类号： F02D45/00 , F02D41/14 , F02D41/22 , G01N27/26 , G01N27/41
摘要： PURPOSE: To diagnose the abnormality of an air-fuel ratio sensor and improve the control accuracy of an air-fuel ratio control system using the detected result of the air-fuel ratio. CONSTITUTION: Fuel injection valves 7 for injection-feeding fuel to each cylinder are disposed at the intake pipe of an internal combustion engine 1, and an A/F sensor 26 for linearly increasing/decreasing output to an air-fuel ratio is disposed at an exhaust pipe 12. A CPU 42 in an ECU 41 computes an air-fuel ratio correction factor on the basis of the deviation between the air-fuel ratio detected by the A/F sensor 26 and a target air-fuel ratio and executes air-fuel ratio feedback control using the correction factor. The CPU 42 judges whether to command the correction of the fuel injection quantity according to whether the target air-fuel ratio has changed exceeding the specified quantity (whether the target air-fuel ratio has suddenly changed). At the sudden change time of the air-fuel ratio, the CPU 42 diagnoses the abnormality of the A/F sensor 26 from the result of comparing the variation of the air-fuel ratio correction factor with the variation of the target air-fuel ratio.

6. 发明专利

JP2518317B2 失效
公开(公告)号：JP2518317B2
公开(公告)日：1996-07-24
申请号：JP28278887
申请日：1987-11-09
申请人： NIPPON DENSO CO
发明人： IIDA HISASHI , IWAMOTO SHINICHI , KAMAI KENICHIRO , KINUGAWA MASUMI , ISOMURA SHIGENORI , TAKAO MITSUNORI
IPC分类号： F02D41/22 , F02D41/00 , F02D41/32 , F02D45/00 , F02P5/15

7. 发明专利

JPH05125997A ABNORMALITY DETECTION DEVICE FOR FUEL EVAPORATION PREVENTION DEVICE 失效
公开(公告)号：JPH05125997A
公开(公告)日：1993-05-21
申请号：JP10702092
申请日：1992-04-24
申请人： NIPPON DENSO CO
发明人： IIDA HISASHI , SUZUMURA HISAHIRO , OSADA KIYOSHI
IPC分类号： F02B77/08 , F02M25/08 , G01M15/00 , G01M15/04
摘要： PURPOSE:To surely detect any abnormality that could cause leakage, such as breakage somewhere in the whole fuel evaporation preventive device from a fuel tank to a suction pipe. CONSTITUTION:A canister blocking valve 37 for blocking an atmospheric hole 36 is mounted in a canister 30 and a pressure sensor 44 is mounted in a fuel tank 22. While a vehicle is stopped and in an idle operating condition, a purge control valve 40 and the canister blocking valve 37 are closed up to keep the area from the fuel tank 22 to a suction pipe 2 in a sealed state under atmospheric pressure (time T1, T2), and the amount DELTA1 of pressure changes in the sealed state under atmospheric pressure is measured (time T2-T3). Next, the purge control valve 40 is closed up and then switched to a full open state and suction pipe negative pressure is introduced into the sealed area (time T3) and the amount DELTA2 of pressure changes in the sealed state under negative pressure is measured (time T4-T5). When DELTAP2 is greater than /DELTAP1, the result of detection that a cause of leakage exists somewhere in the sealed area is notified.

8. 发明专利

JPH0914022A AIR-FUEL RATIO CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH0914022A
公开(公告)日：1997-01-14
申请号：JP16022695
申请日：1995-06-27
申请人： NIPPON DENSO CO
发明人： YAMASHITA YUKIHIRO , IIDA HISASHI
IPC分类号： F02D45/00 , F02D37/02 , F02D41/14
摘要： PURPOSE: To improve an emission and drivability during a travel on a high ground by variably setting a feedback gain of air-fuel ratio control, depending on a detected atmospheric pressure for improving a feedback characteristic during fluctuation of an atmospheric pressure. CONSTITUTION: When an engine speed is equal to or less than the preset value in a steady state, an intake pipe correction value corresponding to an engine speed is obtained from a map. Also, a detected atmospheric pressure is updated to a high or a low value, according to travel of a vehicle under operation to a high or low ground, and a subsequent drop or rise in a pressure. The detected atmospheric pressure is card treated to 760mmHg when the updated value is higher than 760mmHg, and to 550mmHg when the updated value is lower than 550mmHg. Thereafter, judgement is made as to whether the pressure corresponds to a value above 760mmHg, a value equal to or less than 760mmHg but higher than 650mmHg, a value equal to or less than 650mmHg but higher than 600mmHg, or a value equal to or lower than 600mmHg at steps 151 to 153. Then, respective feedback gains are obtained from a preliminarily established map at steps 154 to 157.

9. 发明专利

JPH094438A CATALYST DETERIORATION DETECTOR AND EXHAUST EMISSION CONTROL DEVICE ABNORMALITY DETECTOR 失效
公开(公告)号：JPH094438A
公开(公告)日：1997-01-07
申请号：JP16264095
申请日：1995-06-28
申请人： NIPPON DENSO CO
发明人： YAMASHITA YUKIHIRO , IIDA HISASHI , NAKAYAMA MASAAKI
IPC分类号： F01N3/20 , F01N11/00 , F02D41/02 , F02D41/14
摘要： PURPOSE: To detect deterioration according to the degree of an increase in emission so as to properly monitor a catalyst. CONSTITUTION: A ternary catalyst 13 is provided in the exhaust pipe 12 of an internal combustion engine 1, an A/F sensor 26 is arranged in its upstream side and a downstream side O2 sensor 27 is arranged in its downstream side. A CPU 3 in an ECU 31 executes air-fuel ration feedback control according to the detected result of the A/F sensor 26. The CPU 3 determined the activation of the ternary catalyst 3 when the inversion cycle of an air-fuel ration by the downstream side O2 sensor 27 exceeds a specified time and in this case, the amount of heat needed from an engine starting time to catalyst activation is estimated. This heat amount is calculated based on the integrated value of the amount of intake air (integrated intake air amount) from the engine starting to the catalyst activation. Then, the CPU 3 determines the deterioration of the ternary catalyst 3 according to the integrated value of the heat amount.

10. 发明专利

JPH08338286A EXHAUST SYSTEM FAILURE DIAGNOSTIC DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH08338286A
公开(公告)日：1996-12-24
申请号：JP14700695
申请日：1995-06-14
申请人： NIPPON DENSO CO
发明人： OKAMOTO YOSHIYUKI , KAJI TAKASHI , IIDA HISASHI
IPC分类号： F02D45/00 , F01N3/20 , F01N11/00 , F02D41/14
摘要： PURPOSE: To integrate the deviation between the output voltage of a downstream sensor and a target voltage, compare it with a prescribed deterioration judgment value, and judge the deterioration of an exhaust system, when it is the judgment value or more, to judge the deterioration seen from the whole exhaust system including the downstream sensor. CONSTITUTION: Various parameters showing the engine operating state are read (101). In order to feed back the output voltage of a downstream oxygen sensor to a prescribed voltage (stoichiometric), a target voltage set according to engine rotating speed or intake pipe pressure is calculated (102). Thereafter, the deviation between the output voltage of the downstream oxygen sensor and the target voltage is calculated (103), and the voltage deviation is integrated (104). A main F/B correction value is calculated by use of the integrated value of the deviation voltage (105). The voltage integrated value for judging the deterioration of an exhaust system is also calculated from the integrated value of the voltage deviation (113), and compared with a set deterioration judgment value (114). When the voltage integrated value is the deterioration judgment value or more, the deterioration of the exhaust system is judged to display a failure (115).

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