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41. 发明专利

DE69502845T2 未知
公开(公告)号：DE69502845T2
公开(公告)日：1999-01-21
申请号：DE69502845
申请日：1995-02-09
申请人： HITACHI LTD
发明人： KURIHARA NOBUO , KIMURA HIROSHI , TAKAKU YUTAKA , ISHII TOSHIO
IPC分类号： F02D45/00 , F01N3/20 , F01N9/00 , F01N11/00 , F02D41/14 , F01N7/00
摘要： A diagnosis apparatus for diagnosing a catalytic converter (2) of a motor vehicle as to whether the catalyst suffers deterioration by estimating a temperature of the catalyst or that of the exhaust gas in the vicinity of the catalyst on the basis of a plurality of engine parameters to thereby decide deterioration of the catalyst (2) by using as an index the estimated temperature. The apparatus includes a unit (20) (Fig. 2) for estimating the temperature of the catalyst in a steady state by making use of an engine speed and an engine load which represent typical parameters employed in fuel injection control of the engine. The steady-state temperature facility (201) is realized by storing the engine speeds and the engine loads obtained experimentally in the steady state operation of the engine in the form of a two-dimensional data map. A unit (16) for correcting the estimated temperature of the catalyst in the transient state is provided for correcting the catalyst temperature determined by the steady-state catalyst temperature estimating unit to thereby ensure correct estimation of the catalyst temperature even in the course of operation of the motor vehicle. In the transient temperature estimating unit, non-linear characteristics are each described by combining a plurality of linear characteristics. A unit for estimating the temperature of the catalyst on the basis of the value determined by the steady-state temperature estimating unit and the transient-state temperature estimating unit is provided to decide deterioration of the catalyst (2). Diagnosing method and apparatus capable of diagnosing deterioration of the catalyst with a high reliability are realized.

42. 发明专利

DE4243339C2 未知
公开(公告)号：DE4243339C2
公开(公告)日：1998-05-28
申请号：DE4243339
申请日：1992-12-21
申请人： HITACHI LTD
发明人： KURIHARA NOBUO , ISHII TOSHIO , MUKAIHIRA TAKASHI , KAWANO KAZUYA , TAKAKU YUTAKA
IPC分类号： F01N3/20 , F01N11/00 , F02D41/14 , F02D45/00 , G01M15/10 , G01M15/00 , F01N9/00 , G01N27/416
摘要： A system which is capable of diagnosing the deterioration condition of an engine exhaust gas purifying device has front and rear air/fuel ratio sensors for detecting the air/fuel ratio of the exhaust gas upstream and downstream of the catalyst, an autocorrelation function calculation for calculating the autocorrelation function phi xx of an output signal from the front air/fuel ratio sensor to output the maximum values ( phi xx)max of the autocorrelation function phi xx at predetermined intervals, each maximum value ( phi xx)max being in each of the predetermined intervals. A cross-correlation function calculator calculates the cross-correlation function phi xy between the output signals from the front and rear air/fuel ratio sensors to output the maximum values ( phi xy)max of the mutual correlation function phi xy at predetermined intervals, each maximum value ( phi xy)max being in each of the predetermined intervals therefore. The ratios between the maximum values ( phi xy)max and ( phi xx)max (successive deterioration index PHI i) are calculated to determine the deterioration condition of the catalyst by comparing the ratio with a predetermined reference value.

43. 发明专利

DE19527367A1 Leak diagnostic method for fuel vapour recovery system 未知
公开(公告)号：DE19527367A1
公开(公告)日：1996-02-01
申请号：DE19527367
申请日：1995-07-26
申请人： HITACHI LTD
发明人： KURIHARA NOBUO , KIMURA HIROSHI , TAKAKU YUTAKA , ISHII TOSHIO
IPC分类号： F02M25/08 , B60K15/035 , F02D41/00 , G01M3/26 , B65D90/50
摘要： A pressure sensor is provided for determining the pressure in the system and a pressure differential sensor (6) for determining a pressure alteration. With a leakage unit air from the outside flows in or vaporised fuel is discharged to the outside. The leakage of the system is determined by comparing an operating condition of the leakage unit and a non operating condition of the leakage unit. The IC engine has a main fuel container (1) and a tank (2), a first control valve (3) used for emptying or flushing, a control stop valve (4) and a third control measuring valve (5) and a control system (7).

44. 发明专利

DE4404449A1 Diagnostic device for a catalytic converter of an internal combustion engine 未知
公开(公告)号：DE4404449A1
公开(公告)日：1994-09-15
申请号：DE4404449
申请日：1994-02-11
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： MUKAIHIRA TAKASHI , ISHII TOSHIO , TAKAKU YUTAKA , NUMATA AKIHITO
IPC分类号： F02D45/00 , F01N3/20 , F01N11/00 , F02D41/12 , F02D41/14 , G01M19/00 , G01M15/00 , F01N9/00
摘要： A catalytic diagnostic device is disclosed for determining whether a catalyser of an internal combustion engine has deteriorated. Combustion air ratio sensors are arranged on the upstream and downstream sides of the catalytic converter, and the output signal from the upstream air/fuel sensor is used to control the air/fuel mixture which is provided to the engine via the fuel-injection nozzles, to be precise in a conventional operational mode in a closed loop. The diagnosis of the condition of the catalytic converter is only carried out when selected engine operating parameters fall within a predetermined diagnostic range. When the engine is operated in the diagnostic range, the condition of the catalytic converter is analysed by calculating a deterioration index on the basis of a comparison of the variation of the output signals from the upstream and from the downstream air ratio sensor. In the case of a preferred exemplary embodiment, a value table is provided in order to correct the deterioration index on the basis of the inlet air stream rate to the engine and of the cyclic frequency of the variation of the downstream combustion air ratio sensor.

45. 发明专利

DE3866117D1 未知
公开(公告)号：DE3866117D1
公开(公告)日：1991-12-19
申请号：DE3866117
申请日：1988-01-21
申请人： HITACHI LTD
发明人： TAKAKU YUTAKA , TAMAKI SIGEO
IPC分类号： F02D41/22 , F02B1/04 , F02D11/10 , F02D41/00 , F02D41/24 , F02D43/00 , F02D45/00
摘要： A fail-safe method and system against sticking of the throttle valve (3) are disclosed for automotive engines of a type with a fuel supply unit (2) and a throttle valve (3) driven through an actuator (4). The amount of depression of the accelerator pedal (11) is detected by an accelerator pedal sensor (9). The system further comprises a device (203) for detecting that the throttle valve (3) is sticked, and a device for controlling the fuel flow rate from the the fuel supply unit (2) in accordance with the output of the accelerator pedal sensor (9) when the throttle valve is sticked. The system preferably further comprises an auxiliary air path bypassing the throttle valve (3). The bypass air amount from the auxiliary air path is controlled if the throttle valve (3) is sticked at a low opening degree, while the fuel flow rate of the fuel supply unit (2) is controlled if the throttle valve (3) is sticked at a middle or high opening degree.

46. 发明专利

CA1290203C CONTROL DEVICE FOR THROTTLE VALVE FOR INTERNAL COMBUSTION ENGINE 未知
公开(公告)号：CA1290203C
公开(公告)日：1991-10-08
申请号：CA520207
申请日：1986-10-09
申请人： HITACHI LTD
发明人： KAWANO HIROTOSHI , YANAGISAWA SHOZO , OSAWA TADAO , USUI TOSHIFUMI , TAKAKU YUTAKA
IPC分类号： F02M7/00 , B60K26/04 , F02D9/02 , F02D11/04 , F02M19/12
摘要： A control device for a throttle valve for use with an internal combustion engine installed in a vehicle. The device has a throttle valve shaft secured to the throttle valve, and a linkage to be driven by a linkage member including an accelerator wire for opening and closing the throttle valve. The linkage is a three-joint linkage mechanism including a throttle lever secured to the throttle valve shaft, a lever-mounting shaft secured to the throttle body, a drive lever rotatably mounted on the lever-mounting shaft, and a rod connecting the throttle lever and the drive lever.

47. 发明专利

DE10107680B4 未知
公开(公告)号：DE10107680B4
公开(公告)日：2008-09-04
申请号：DE10107680
申请日：2001-02-19
申请人： HITACHI LTD
发明人： TAKAKU YUTAKA , ISHII TOSHIO , KAWAMOTO SHIGERU , NAKAGAWA SHINJI , OOSUGA MINORU , FUJII YOSHIHISA
IPC分类号： F01N9/00 , F02P5/15 , B01D53/94 , F01N3/08 , F01N3/20 , F01N3/24 , F01N3/28 , F01N11/00 , F02D21/08 , F02D41/02 , F02D41/14 , F02D43/00 , F02D45/00 , F02M25/07
摘要： An object of the present invention is to provide an engine exhaust gas cleaning system which can accurately judge whether or not there is the remaining capacity in an NOx trapping amount of an NOx trapping agent, can optimize the timing of NOx purge control, and can diagnose the deterioration of the NOx trapping agent.The present invention is characterized by an engine exhaust gas cleaning system comprising an operating control parameter changing means for changing operating control parameters of the engine in order to change an amount of NOx trapped to the NOx trapping agent; a concentration detecting means for detecting a concentration of a specified component in the exhaust gas at a position downstream of the NOx trapping agent; an air-fuel ratio changing means for temporarily changing the air-fuel ratio of the exhaust gas to a stoichiometric air-fuel ratio or a rich air-fuel ratio with a preset period; and an NOx trapping amount change detecting means for detecting change in the amount of NOx trapped to the NOx trapping agent based on change in a detected result of the concentration detecting means when the air-fuel ratio is changed after changing the operating control parameter.

48. 发明专利

DE19938037B4 未知
公开(公告)号：DE19938037B4
公开(公告)日：2007-08-23
申请号：DE19938037
申请日：1999-08-12
申请人： HITACHI LTD
发明人： TAKAKU YUTAKA , ISHII TOSHIO , NOGI TOSHIHARU
IPC分类号： F02D41/22 , F02D45/00 , F02D41/02 , F02D41/04 , F02D41/34 , F02D41/40
摘要： A diagnosing system for an engine diagnoses malfunctions that occur in a direct-injection engine in which fuel is injected into combustion chambers or a lean-burn engine. The present invention provides a diagnosing system for an engine capable of diagnosing malfunctions in an intake air flow intensifying component and a fuel supply component and of specifying a malfunctioning part without being affected by the difference between different engines, the difference in quality between parts and aging. The diagnosing system for an engine comprises: a selecting component for selecting either a first air-fuel mixture control component or a second air-fuel mixture control component according to operating condition of an engine; a combustion condition detecting component for detecting combustion condition of the engine; and decision component for deciding a malfunction on the basis of a first combustion condition detected by the combustion condition detecting component in a state where the first air-fuel mixture control component is selected by the selecting component, and a second combustion condition detected by the combustion condition detecting component in a state where the second air-fuel mixture control component is selected by the selecting component.

49. 发明专利

DE69533415D1 未知
公开(公告)号：DE69533415D1
公开(公告)日：2004-09-23
申请号：DE69533415
申请日：1995-12-18
申请人： HITACHI LTD
发明人： TAKAKU YUTAKA
IPC分类号： F01N11/00 , F01N13/00 , F01N99/00 , F02B77/08 , F02D41/14 , F02D45/00
摘要： The leak of exhaust system (5,6,7) is detected by leak detection means (20), and when leak was detected, the diagnosis relating to air-fuel ratio feedback control or catalyst (6) is stopped or corrected. A place and an amount of the leak are detected and as various control or diagnosis etc. are stopped or corrected according to the detected effect, over heat of the catalyst, incrementation of the harmful exhaust-gas and the false diagnosis of the catalyst (6) can be prevented suitably.

50. 发明专利

DE10345187A1 未知
公开(公告)号：DE10345187A1
公开(公告)日：2004-06-24
申请号：DE10345187
申请日：2003-09-29
申请人： HITACHI LTD
发明人： AONO TOSHIHIRO , FUKUCHI EISAKU , HORI TOSHIO , TAKAKU YUTAKA
IPC分类号： F02D45/00 , G01M15/11 , F02D41/22 , F02D41/00
摘要： A misfire detector is provided that is accurate even in the case of a disturbance due to causes such as driving on a rough road. The misfire detector is equipped with a crankshaft revolution detector to measure the time period required for the crankshaft of an internal-combustion engine to revolve for a given angle. A signal-processor is also provided for detecting the misfiring of the internal-combustion engine by processing the time period. In one embodiment, the misfire detector has two filters having the same sensitivity to the misfire frequency, and differing in the sensitivity to frequencies adjacent to said misfire frequency. It can be determined that a misfire has occurred if the ratio or difference between the outputs of the two filters stays within a fixed range and one or both of the filters have respective outputs exceeding a threshold value.

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