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21. 发明专利

JPH0586995A SELF-DIAGNOSING DEVICE FOR FUEL VAPORIZED GAS DIFFUSION PREVENTING DEVICE 失效
公开(公告)号：JPH0586995A
公开(公告)日：1993-04-06
申请号：JP24217091
申请日：1991-09-21
申请人： NIPPON DENSO CO
发明人： SUZUMURA HISAHIRO , IIDA HISASHI
IPC分类号： F02B77/08 , F02M25/08
摘要： PURPOSE:To provide a self-diagnosing device for a fuel vaporized gas diffusion preventing device which more reliably decides feed ability by taking unevenness in fuel gas density into consideration when feed abnormality owing to which fuel vaporized gas is not introduced to an intake air passage is detected. CONSTITUTION:A flow rate of gas fed from a fuel tank 7 to a canister 37 is detected by means of a diaphragm, a permanent magnet, a magnetic flux detector 20, and a control circuit 44, and gas density is detected by means of an oxygen concentration sensor 46 and a control circuit 44. Through control of a purge valve 40 by means of a control circuit 44, from a gas flow rate and a fuel vaporized gas density, the weight of fuel vaporized gas fed from the fuel tank 7 to the canister 37 is determined in a state to close a discharge passage 39. When the determined value exceeds a set value, through control of the purge valve 40, the discharge passage 39 is brought into an opening or a closed state. From a change in an air-fuel ratio detected by an o, sensor 6, it is decided whether abnormality occurs. When abnormality occurs, an alarm lamp 45 is lighted ON to announce an alarm.

22. 发明专利

JPH04311662A SELF-DIAGNOSTIC DEVICE IN EVAPORATIVE EMISSION DIFFUSION PREVENTING DEVICE 失效
公开(公告)号：JPH04311662A
公开(公告)日：1992-11-04
申请号：JP7540591
申请日：1991-04-08
申请人： NIPPON DENSO CO
发明人： SUZUMURA HISAHIRO , IIDA HISASHI , KONDO TOSHIO , ISOMURA SHIGENORI
IPC分类号： F02M25/08
摘要： PURPOSE:To provide a self-diagnostic device capable of detecting abnormality positively taking account of fuel gas density fluctuation (the difference of outside air temperature, fuel volatility, and the like) caused by residual air in a fuel tank at the time of detecting such supply abnormality that evaporative emission is not induced into an inlet passage. CONSTITUTION:In the state of enabling the detection of gas flow from a fuel tank 7 to a canister 37, a control circuit 44 controls a purge valve 40 to close a discharge passage 39. In this state, when the gas flow sent to the canister 37 from the fuel tank 7 becomes more than the specified value, the purge valve 40 is controlled to close and open the discharge passage 39, and the existence of abnormality is judged by the change of an air-fuel ratio detected by an O2 sensor 6 at that time. Upon judging the existence of abnormality from the above-mentioned judgment, the control circuit 44 sets the set value of gas flow to the larger value than the existing value to perform abnormality judgment again, and lights an alarm lamp 45 for warning at the time of judging the existence of abnormality.

23. 发明专利

JPH03202649A FUEL SUPPLY CONTROL DEVICE FOR ENGINE 失效
公开(公告)号：JPH03202649A
公开(公告)日：1991-09-04
申请号：JP34257489
申请日：1989-12-28
申请人： NIPPON DENSO CO
发明人： IIDA HISASHI , YAMADA FUJIKI
IPC分类号： F02D41/06 , F02D41/22
摘要： PURPOSE:To enhance the starting characteristic by measuring the requisite time from the post-start judging to stall judging, altering the initial value of the post-start increment value in the internal combustion engine concerned according to this requisite time measured, and thereby smoothening transfer from initial combustion to complete combustion. CONSTITUTION:When an at-starting sensing means 11 of a CPU 5 senses that an engine 1 is in the starting process, a misstarting sensing means 12 senses that the engine 1 has failed starting, for ex. from the fact that stall is brought about after the engine 1 revolving speed NE has sunk below the set value. A timer 13 measures the time required for the engine 1 revolving speed NE to sink from below the set value to the lower limitation. An initial value altering means for post-start increment value 14 alters the initial value of the post-start increment value in compliance with the requisite time measured. A means 15 controls the valve opening time of a fuel injection valve 4 through increase/decrease of the initial value by an increasing means 15a and a decreasing means 15b on the basis of the altered initial value. This accomplishes smooth transfer from initial combustion to complete combustion, and the engine starting characteristic is enhanced.

24. 发明专利

JPH08338287A AIR-FUEL RATIO CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH08338287A
公开(公告)日：1996-12-24
申请号：JP14700595
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 , F02D41/14
摘要： PURPOSE: To integrate the deviation between target and actual air-fuel ratios, calculate the correction factor of fuel injection quantity by use of this followed by learning, prohibit the integration of air-fuel ratio deviation or the renewal of learning value to prevent a reduction in learning precision. CONSTITUTION: The deviation of a target air-fuel ratio and the actual air-fuel ratio detected by an air-fuel ratio sensor 28 is calculated, and the integrated value of the deviation is calculated. The correction factor of air-fuel ratio is calculated by use of the deviation and the integrated value. On the other hand, when an establishment of learning condition such that an operating state parameter such as the intake pipe pressure by an intake pipe pressure sensor 17 or the engine rotating speed by a crank angle sensor 24 is in a prescribed learning area showing a stable operating state at steady running, or the engine cooling water temperature is a prescribed temperature or more is judged, whether the air-fuel ratio fluctuation (rich/lean peak) repeatedly processed every ignition timing was detected or not is judged, and when the peak was detected, the integration of air-fuel ratio deviation or the learning processing is not performed.

25. 发明专利

JPH08285808A DIAGNOSTIC APPARATUS FOR ABNORMALITY OF AIR-FUEL RATIO SENSOR 失效
公开(公告)号：JPH08285808A
公开(公告)日：1996-11-01
申请号：JP8965195
申请日：1995-04-14
申请人： NIPPON DENSO CO
发明人： HASEGAWA JUN , IIDA HISASHI
IPC分类号： G01N27/41 , F02B77/08 , F02D41/14 , F02D41/22 , F02D45/00 , G01N27/26
摘要： PURPOSE: To obtain a diagnostic apparatus by which the abnormality of an air-fuel ratio sensor is diagnosed with good accuracy and which contributes toward enhancing the control accuracy of an air-fuel ratio control system using the detection result of the air-fuel ratio sensor. CONSTITUTION: An A/F sensor 26 which detects an air-fuel ratio linearly is arranged and installed at an exhaust pipe 12 at an internal-combustion engine 1. A CPU 42 inside an ECU 41 sets an air-fuel ratio correction factor according to the deviation between the air-fuel ratio detected by the A/F sensor 26 and a target air-fuel ratio so as to execute an air-fuel ratio feedback control operation by using the correction factor. In addition, the CPU 42 diagnoses the abnormality of the A/F sensor 26 by one out of a cycle judgment, a phase shift judgment and an amplitude shift judgment regarding the air-fuel ratio detected by the A/F sensor 26 and regarding the air-fuel ratio correction factor. In addition, the CPU 42 diagnoses the abnormality of the A/F sensor 26 according to whether the change amount of the air-fuel ratio or the change amount of the air-fuel ratio correction factor exceeds a tolerance or not.

26. 发明专利

JPH08200118A FUEL INJECTION OF INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH08200118A
公开(公告)日：1996-08-06
申请号：JP1038695
申请日：1995-01-26
申请人： NIPPON DENSO CO
发明人： IIDA HISASHI , SUZUMURA HISAHIRO
IPC分类号： F01L7/02 , F02D13/02 , F02D41/04 , F02M69/00
摘要： PURPOSE: To reduce intake air pulsation sound by adjusting the distribution speed of intake air by a distribution means, and sufficiently achieving atomization of fuel. CONSTITUTION: An ECU 4 corrects appropriately the distribution speed of an air control valve 28 for distributing intake air introduced from the upstream side of a throttle valve 14 through an air introducing part 27 for each intake stroke on the basis of the engine water temperature, approximately in synchronization with fuel injection by fuel injection vales 26. Therefore, the supplying amount of intake air is adjusted, atomization of fuel is promoted, and intake air pulsation sound is restrained.

27. 发明专利

JPH08193537A FUEL INJECTION CONTROLLER OF INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH08193537A
公开(公告)日：1996-07-30
申请号：JP586295
申请日：1995-01-18
申请人： NIPPON DENSO CO
发明人： YAMASHITA YUKIHIRO , IIDA HISASHI
IPC分类号： F02D41/14 , F02D41/02 , F02D41/12
摘要： PURPOSE: To secure an extent of high exhaust emission control capacity by means of a three way catalyst, in this fuel injection controller to be equipped with a fuel injection stopping function. CONSTITUTION: A three way catalyst 13 removing toxic substances in exhaust gas is installed in an exhaust system of an internal combustion engine 1, while an air-fuel sensor 26 detecting an air-fuel ratio of mixture into this engine 1 linearly is also installed there. A central processing unit(CPU) 32 in an electronic control unit(ECU) 31 controls a fuel injection quantity for its feedback by means of a fuel injection valve 7 so as to make the air-fuel ratio by the air-fuel sensor 26 come to a desired air-fuel ratio, and simultaneously the fuel injection is stopped under the specified condition based on an engine driving state (fuel-cut). In addition, the central processing unit 32 calculates an oxygen quantity to be adsorbed to the three way catalyst 13 in time of this fuel-cut, while in time of richness in the air-fuel ratio, the oxygen quantity separating from the three way catalyst 13 is calculated. Moreover, the CPU 32 in time of transition from the fuel-cut to the feedback control, on the basis of the value made up of subtracting the separate oxygen quantity from the adsorbed oxygen quantity the desired air-fuel ratio is temporarily set to the rich side.

28. 发明专利

JPH08177575A SELF-DIAGNOSTIC DEVICE FOR AIR-FUEL RATIO CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH08177575A
公开(公告)日：1996-07-09
申请号：JP32808694
申请日：1994-12-28
申请人： NIPPON DENSO CO
发明人： KOSAKA YASUO , NAKAYAMA MASAAKI , MUKAI YASUO , YAMASHITA YUKIHIRO , IIDA HISASHI
IPC分类号： F02B77/08 , F02D41/12 , F02D41/14 , F02D41/22
摘要： PURPOSE: To improve the diagnostic accuracy of sensor abnormality by obtaining the output change rate of a sensor for detecting an air-fuel ratio or oxygen concentration in exhaust gas after detecting the change of fuel supply quantity, and judging whether the sensor is abnormal on the basis of the change rate. CONSTITUTION: An ECU 36 diagnoses whether an air-fuel ratio sensor 28 is abnormal and lights an alarm lamp 39 to inform an operator at the abnormal time, but at the time of diagnosing the abnormality of the air-fuel ratio sensor 28, starts diagnostic processing by the start of fuel cut-off and reads and stores sensor output I1 at the start time of fuel cut-off. The ECU 36 also actuates a timer to count the elapsed time after the start of fuel cut-off and reads the time until the sensor output rises to I2 from the count value of the timer so as to compute the change rate δI of sensor output. The ECU 36 then compares this change rate δI with the abnormality judgment value Ifc and judges sensor abnormality in the case of δI

29. 发明专利

JPH06346825A ABNORMALITY DETECTION DEVICE FOR ASSIST AIR CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH06346825A
公开(公告)日：1994-12-20
申请号：JP13793293
申请日：1993-06-08
申请人： NIPPON DENSO CO
发明人： IIDA HISASHI , HONJO KEIJI
IPC分类号： F02M69/32 , F01N3/22 , F01N11/00 , F02D7/02 , F02D9/10 , F02D35/00 , F02D41/22 , F02D45/00 , F02M3/07 , F02M21/02 , F02M23/04 , F02M23/12 , F02M69/00 , F02M69/04 , F02M69/08 , F02M69/48
摘要： PURPOSE:To provide an abnormality detection device for an assist air control device for an internal combustion engine which can judge abnormality such as deterioration of responsiveness in a control valve. CONSTITUTION:A fuel injection valve 10 is arranged on a downstream side of a throttle valve 7 in an intake passage 5. An upstream side of the throttle valve 7 is communicated with a fuel injection valve 10 through an assist air passage 17. Air is introduced to a fuel injection port of the fuel injection valve 10 through the assist air passage 17. An air control valve 18 is arranged on the way of the assist air passage 17. An assist air passage pressure sensor 20 is arranged on the downstream side of the air control valve 18 in the assist air passage 17 for detecting the pressure in the assist air passage 17. An ECU 21 judges abnormality such as deterioration in responsiveness of the air control valve 18 or blinding of the air injection port based on a pressure Pa in the assist air passage 17 detected by the assist air passage pressure sensor 20 at the time of opening and closing the air control valve 18.

30. 发明专利

JPH06241128A AIR-FUEL RATIO CONTROLLER OF INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH06241128A
公开(公告)日：1994-08-30
申请号：JP2894993
申请日：1993-02-18
申请人： NIPPON DENSO CO
发明人： SAKAKIBARA SHUJI , NAKAYAMA MASAAKI , IIDA HISASHI
IPC分类号： F02D41/08 , F02D41/16 , F02D45/00 , F02M25/08
摘要： PURPOSE:To prevent engine stall at the time of idling when fuel steam gas concentration is high, and surely perform self diagnosis in a fuel steam gas diffusion prevention device. CONSTITUTION:An air-fuel ratio correction quantity feedback-controlled by output of an oxygen sensor for detecting oxygen concentration in exhaust gas of an engine 1 is read out, and steam gas concentration sucked in an intake system of the engine from a canister 17 based on the value is calculated, and abnormality detection process is prohibited when the steam gas concentration is more than a specified value, and a purge valve 23 is opened up to a specified opening when it is less than a specified value, and the abnormality detection process of a fuel steam gas diffusion prevention device is practised.

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