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1. 发明专利

JPH0734943A ABNORMALITY DETECTING DEVICE FOR COOLING WATER TEMPERATURE SENSOR FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH0734943A
公开(公告)日：1995-02-03
申请号：JP17665793
申请日：1993-07-16
申请人： NIPPON DENSO CO
发明人： MUKAI YASUO , NAKAYAMA MASAAKI
IPC分类号： F02D41/22 , G05B23/02
摘要： PURPOSE:To constantly and accurately judge an abnormality regardless of whether it occurs at start-up of an engine or after the start-up by judging the abnormality in a cooling water temperature detecting means depending on the cooling water temperature at start-up of the engine, which is related to output property of the cooling water temperature detecting means, and the engine speed after the engine is started. CONSTITUTION:In addition to an engine speed sensor 2 and a cooling water temperature sensor 3, an idle switch 4 for detecting the fully closed state of a throttle valve 6 on an air intake pipe 5, etc., are installed on an internal combustion engine 1. Based on these respective signals, an electronic control device 9 controls an idle speed control valve 8 on a bypass passage 7 bypassing the throttle valve 6. In this case, the elecronic control device 9 stores the cooling water temperature detected at the time when the internal combustion engine 1 is started, by a RAM 9e. Until the judgement of an abnormality is made after the internal combustion engine 1 is started, a CPU 9 judges the abnormality in the cooling water temperature sensor 3 depending on the detected engine speed and the stored cooling water temperature.

2. 发明专利

JPH074320A EXHAUST GAS RECIRCULATION CONTROL DEVICE 失效
公开(公告)号：JPH074320A
公开(公告)日：1995-01-10
申请号：JP14626293
申请日：1993-06-17
申请人： NIPPON DENSO CO
发明人： NAKAYAMA MASAAKI , MUKAI YASUO
IPC分类号： F02M25/07
摘要： PURPOSE:To correctly judge abnormality of an exhaust gas recirculation device (EGR). CONSTITUTION:A control circuit 8 controls a step motor 15 so as to change an EGR valve 13 at first from opening to closing or from closing to opening, and the changed quantity of pressure at this time is detected by means of an intake pipe pressure sensor 2. Next it is judged whether the changed quantity of the pressure is over a decided value or not. When the changed quantity is over the decided value, it is judged to be normal, and when the changed quantity is under the decided value, after enlarging the opening of the EGR valve 13, the step motor 15 is controlled so as to change the EGR valve from opening to closing, or from closing to opening, and the changed quantity of the pressure is detected by means of the intake pipe pressure sensor 2. Hereat, when the changed quantity is over the decided value, it is judged to be normal, and when it is under the decided value, it is judged to be abnormal.

3. 发明专利

JPH0510199A MISFIRE DETECTOR FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH0510199A
公开(公告)日：1993-01-19
申请号：JP18761091
申请日：1991-07-26
申请人： NIPPON DENSO CO
发明人： BABA YASUTOSHI , NAKAYAMA MASAAKI , YUKIMOTO HIDEKI
IPC分类号： F02B77/08 , F02D45/00 , F02P17/12 , G01M15/11
摘要： PURPOSE:To provide a newly invented device that is able to detect a misfire in an internal combustion engine so accurately even at a time when a vehicle travels on a rough road. CONSTITUTION:On the basis of a period ranging from the last interrupt timing to this time interrupt timing, an engine speed of omega 1801 in a gap of 180 deg. CA is calculated (step 30). Then, an engine speed variation 1801 is found out of a deviation between the last engine speed omega 1801-1 and this time engine speed omega1801(step 300), and whether this value is minus or plus is judged (step 310), while this judged result is stored in two registers REG1 and REG2 (step 340, 350). In succession, these data are plurally stored in advance, and whether or not the pattern is turned to such one peculiar to a misfire as said '1000' is judged (steps 420, 430) for misfire judgment. In this connection, a figure 1 shows that the engine speed variation omega1801 is of minus value and 0 is of plus value, respectively.

4. 发明专利

JPH04365958A MISFIRE DETECTING DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH04365958A
公开(公告)日：1992-12-17
申请号：JP14017891
申请日：1991-06-12
申请人： NIPPON DENSO CO
发明人： NAKAYAMA MASAAKI , BABA YASUTOSHI
IPC分类号： F02B77/08 , F02D45/00 , F02P17/12 , G01M15/04 , G01M15/11
摘要： PURPOSE:To detect misfire with good accuracy at all times by detecting misfire of an internal combustion engine on the basis of two fluctuation amounts which are set by deviation of an actually measured value between two cylinders in which explosion strokes are carried out successively, and deviation of an actual measured value whose rotational angle precedes a prescribed point. CONSTITUTION:A rotational signal is outputted by a means (A) every prescribed rotational angle according to rotation of an internal combustion engine. On the basis of the rotational signal, a time which is necessary for rotation in a prescribed rotational angle in explosion stroke of each cylinder is measured, and a practically measured value is calculated by a means (B). On the basis of the practically measured value, deviation of the real measured value between two cylinders in which explosion strokes are carried out successively, is found out so as to set a first fluctuation amount by a means (C). Meanwhile, on the basis of the rotational signal and the practically measured value, deviation of the practically measured values between two cylinders in which the rotational angle is just before 360 CA so as to set a second fluctuation amount by a means (D). On the basis of both fluctuation amounts, misfire of the internal combustion engine is detected by a means (E). It is thus possible to detect misfire with good accuracy at all times regardless of fluctuation of average rotational speed of the internal combustion engine.

5. 发明专利

JPH04175441A KNOCK CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH04175441A
公开(公告)日：1992-06-23
申请号：JP29410490
申请日：1990-10-30
申请人： NIPPON DENSO CO
发明人： NAKAYAMA MASAAKI , SAKAKIBARA KOJI , KAMADO KOICHI
IPC分类号： F02P5/152 , F02D45/00 , F02P5/15 , F02P5/153
摘要： PURPOSE:To prevent an error detection of knock in a transition by suppressing an abnormal rise of an average level when a knock signal is less than the level obtained by dividing the average level which is obtained by averaging the knock signals from a knock sensor by a specific constant. CONSTITUTION:An average level is produced by an average level producing means B by averaging the knock signals output from a knock sensor A to detect the knock generated in an internal combustion engine G, and a knock is decided by a knock decing means C depending on a knock deciding level obtained by multiplying the average level a specific times and a knock signal. And according to the output of the knock deciding means C, the internal combustion engine G is controlled by a control means D. In this case, a detecting means E to detect a knock signal less than the level obtained by dividing the average level of the knock signal by a specific number is provided, and depending on the detecting result, a rise of the average level is suppressed by a suppressing means F. Consequently, not only the knocking can be decided securely, but also an error detection of the knocking in a transition is prevented.

6. 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

7. 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.

8. 发明专利

JPH03175153A KNOCK CONTROLLER FOR INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH03175153A
公开(公告)日：1991-07-30
申请号：JP31403489
申请日：1989-12-01
申请人： NIPPON DENSO CO
发明人： NAKAYAMA MASAAKI , SAKAKIBARA KOJI
IPC分类号： F02P5/152 , F02D45/00 , F02P5/15 , F02P5/153
摘要： PURPOSE:To improve the followability of a knock decision level, by calculating each cylinder cumulation % value for each cylinder from an all-cylinder average maximum value calculated on the basis of the maximum value of a knock sensor signal, and each cylinder correction value calculated at every maximum value detection, and determining the knock decision level on the basis of this value. CONSTITUTION:At each determined section, the maximum value of a knock sensor signal detected for each cylinder is detected, and the all-cylinder average value of the knock sensor signal is calculated without distinction of cylinders on the basis of this maximum value, and each cylinder correction value is calculated at every maximum value detection as above, and each cylinder cumulation % value of the predetermination of the knock sensor signal is calculated for each cylinder on the basis of the all-cylinder average value and each cylinder correction value. And, a knock decision level is determined on the basis of each cylinder cumulation % value, and the comparison of the knock sensor signal maximum value and the knock decision level is made for each cylinder, and the presence of a knock is discriminated. That is, a knock decision level is prepared by correcting an all-cylinder average value which is renewed at every maximum value detection, with each cylinder correction value which is renewed at every cycle, and renewed at every ignition.

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

JPH05195858A MISFIRE DETECTING DEVICE FOR MULTICYLINDER INTERNAL COMBUSTION ENGINE 失效
公开(公告)号：JPH05195858A
公开(公告)日：1993-08-03
申请号：JP22030292
申请日：1992-08-19
申请人： NIPPON DENSO CO
发明人： ICHIKAWA AKIRA , NAKAYAMA MASAAKI , MORISHIMA HIDEKI , NOMURA ISAMU
IPC分类号： F02D45/00 , F02D41/14 , F02P17/12 , G01M15/11
摘要： PURPOSE:To correctly judge misfire without memorizing a misfire judging value at each cylinder by computing a rotation fluctuating quantity in the explosion stroke of each cylinder, and comparing it with a misfire judging value set based on the degree of dispersion of combustion condition in each cylinder at normal combustion. CONSTITUTION:An engine speed fluctuating quantity computing means 21 computes an engine speed fluctuating quantity in the explosion stroke of each cylinder of a multicylinder internal combustion engine 2, based on rotation signals output from rotation signal output means 10, 16. A misfire judging value setting means 21 sets a misfire judging value of each cylinder, based on a reference misfire judging value memorized by a reference misfire judging value memory means 22 and a misfire judging value correcting factor memorized by a misfire judging value correcting factor memory means 22. A misfire judging means 20 judges misfire of the multicylinder internal combustion engine 2 at every cylinder based on this set misfire judging value and the computed result by the engine speed fluctuating quantity computing means 21. As a result, a data quantity necessary for setting of the misfire judging value at every cylinder is minified and the memory capacity of a memory means can be reduced.

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