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1. 发明专利

JPH05303387A 失效
公开(公告)号：JPH05303387A
公开(公告)日：1993-11-16
申请号：JP10999392
申请日：1992-04-28
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG , NISSAN MOTOR
发明人： SAKURAI YOSHIHIRO , NAKAMURA MITSURU , SATO KENJI , ONO KOICHI , HASEGAWA SATOSHI
IPC分类号： B60R11/02 , G10K11/16 , G10K11/178
摘要： PURPOSE:To provide a constant performance in which engine sounds in a compartment are actively muffle controlled despite of the production dispersion of a speaker driving amplifier gain. CONSTITUTION:Expected output powers of an adaptive filter in each number of revolution region of an engine 1 which is the source of vibration, are beforehand set in a ROM 31 and obtain the total sum of the deviations between actually measured powers and the expected values. And in accordance with the total sum, change the threshold value of the filter output power which judges whether a divergence condition exists or not. Having this, an erroneous judgement, in which a divergence condition exists so as to stop a muffle control, is prevented and unpleasant noises are stably cancelled for the passengers.

2. 发明专利

JPH05232136A ELECTRET-CAPACITOR TYPE ACCELERATION SENSOR 失效
公开(公告)号：JPH05232136A
公开(公告)日：1993-09-07
申请号：JP3472192
申请日：1992-02-21
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： AZUMA YASUO , SASAKI MITSUHIDE , NAKAMURA MITSURU , ONO KOICHI
IPC分类号： G01P15/125
摘要： PURPOSE:To obtain an acceleration sensor, which can be manufactured in mass production at a low cost for each kind of products. CONSTITUTION:An electret-capacitor type acceleration sensor 1 comprises a vibrating film 3, which is formed of a macromolecular film that is made to be an electret, and a planer electrode plate facing the vibrating plate 3 at a constant distance through air having the specific inductive capacity. Or the sensor comprises the structure, wherein the vibrating film 3 is the ordinary macromolecular film, which is not the electret, and the macromolecular film that is made to be the electret is stuck to the surface of a facing electrode plate 5 on the side of the vibration film 3. When acceleration is applied on the surface of the vibrating film 3 in the orthogonal direction, the vibrating film 3 is displaced by the inertia force of own weight of the film 3, and the distance (d) from the electrode plate 5 is changed. Thus, the capacitance between the vibrating film 3 and the electrode 5 is changed. The voltage generated between the film and the electrode plate in this way is converted. Thus, the acceleration is detected.

3. 发明专利

JPH0659688A METHOD AND DEVICE FOR ACTIVE NOISE ELIMINATION AND RELATED ACTIVE NOISE ELIMINATING DEVICE FOR RUNNING VEHICLE 失效
公开(公告)号：JPH0659688A
公开(公告)日：1994-03-04
申请号：JP21005392
申请日：1992-08-06
申请人： HITACHI LTD , HITACHI AUTOMOTIVE ENG
发明人： NAKAMURA MITSURU , SASAKI MITSUHIDE , ABE KOJI , AZUMA YASUO
IPC分类号： F01N1/06 , G10K11/16 , G10K11/178
摘要： PURPOSE:To positively eliminate road noise which arises from a suspension and body vibration when a vehicle runs. CONSTITUTION:Vibration during running is detected by acceleration sensors 1-4 and the detection signals are added in an addition circuit 20 to make up a reference signal 105. The 105 is inputted to a microprocessor 13 via an A/D convertor 12 for applicable signal processing, and then it is outputted as an output control signal 107 and issued in the form of secondary sound from speakers 9-10 via a D/A convertor 14 and a power amplifier 15 to eliminate road noise at the position of microphones 5-8. As the high-coherence reference signal can be supplied in less numbers by adding the plural detection signals, a noise eliminating device can be constructed into a small system.

4. 发明专利

JPH07199963A ACTIVE SILENCER FOR VEHICLE INTERIOR NOISE 失效
公开(公告)号：JPH07199963A
公开(公告)日：1995-08-04
申请号：JP33548693
申请日：1993-12-28
申请人： HITACHI LTD , NISSAN MOTOR
发明人： NAKAMURA MITSURU , SATO KENJI , SASAKI MITSUHIDE , SAITO HIROYUKI , HASEGAWA SATOSHI
IPC分类号： B60R11/02 , G10K11/178
摘要： PURPOSE:To properly execute the divergence prevention function of the adaptive active noise elimination control system of engine confined sound inside an automobile compartment without being influenced by the variance of the gain of a power amplifier and a loudspeaker. CONSTITUTION:Rotation signals 101 detected by the crank angle sensor 2 of an engine are converted to reference signals 100 synchronized with engine rotation and inputted to a microprocessor 30. The processor 30 filters the reference signals 100 by an adaptive filter and outputs secondary sound control signals 103 and secondary sound for eliminating the engine confined sound is outputted through an amplifier 6 by the signal 103. Also, the secondary sound is indirectly detected from the output power of the adaptive filter and it is considered that the divergence is generated when it exceeds a threshold value and secondary sound output (noise elimination control) is stopped. Also, whether or not the gain of the power amplifier and the speaker is exactly a designed value is detected from comparison with the expected value of the output power and an output level adjustment gain G is increased or decreased.

5. 发明专利

JPH0580777A ACTIVE SOUND ELIMINATION DEVICE FOR NOISE IN CAR ROOM 失效
公开(公告)号：JPH0580777A
公开(公告)日：1993-04-02
申请号：JP24145591
申请日：1991-09-20
申请人： HITACHI LTD , NISSAN MOTOR
发明人： HANAWA KAZUHIKO , NAKAMURA MITSURU , SAITO HIROYUKI , SATO KENJI , HASEGAWA SATOSHI
IPC分类号： B60R11/02 , G10K11/16 , G10K11/178
摘要： PURPOSE:To obtain the same superior sound elimination effect over a wide engine rotation range at all times when the car noise due to engine vibration, etc., is actively eliminated by using a secondary sound. CONSTITUTION:The rotation signal 100 of an engine 3 is detected by a crank angle sensor 4 to generate a sine wave reference signal 102 which is proportional to it. A microprocessor 5 receives a crank angle interruption signal 104 and samples and filters the reference signal 102 in synchronism with the timing of the interruption signal to generate a secondary sound control signal 103 for canceling a sound pressure signal detected by a microphone 1, thereby outputting the output signal 103 to a speaker 2. The stable sound elimination effect is obtained even when the engine rotating speed is high - low and varies suddenly.

6. 发明专利

JPH06110470A ACTIVE NOISE CONTROLLER AND ADAPTIVE NOISE CONTROL METHOD 失效
公开(公告)号：JPH06110470A
公开(公告)日：1994-04-22
申请号：JP27024091
申请日：1991-09-21
申请人： HITACHI LTD , NISSAN MOTOR
发明人： SASAKI MITSUHIDE , SAITO HIROYUKI , SATO KENJI , NAKAMURA MITSURU , HASEGAWA SATOSHI , IGARASHI OSAMU
IPC分类号： B60R11/02 , F01N1/06 , G10K11/16 , G10K11/178 , H03H17/00 , H03H17/02 , H03H17/04 , H03H21/00 , H04B3/04
摘要： PURPOSE:To give a passenger neither a feeling of physical disorder nor a feeling of unpleasantness by eliminating abrupt variation in noise level in an acoustic space even if the frequency of a noise in a control object frequency range varies to its outside. CONSTITUTION:A reference signal correlating with a noise source is detected and the frequency and amplitude, etc., of the reference signal are controlled by an adaptive filter (51) to generate a control sound in a cabin (11) through a speaker 9. The control sound interfers with the noise transmitted from the engine (1) in the cabinin the cabin (11) and detect a residual noise, the convergencecoefficient alphap1 and output suppression coefficient alphaqm of theadaptive filter are found according to specific algorithm, and whilethey are properly adjusted, adequate noise control is carried out.The control object frequency range of the noise is limited andfurther a transition area is provided; and the convergencecoefficient and output suppression coefficient are gradually variedin the transition area. (11) to reduce the noise. Further, plural microphones (2) are fitted.

7. 发明专利

JPH0527781A NOISE REDUCTION DEVICE FOR NOISE IN CAR ROOM 失效
公开(公告)号：JPH0527781A
公开(公告)日：1993-02-05
申请号：JP18212491
申请日：1991-07-23
申请人： HITACHI LTD , NISSAN MOTOR
发明人： NAKAMURA MITSURU , SAITO HIROYUKI , SATO KENJI , HASEGAWA SATOSHI , IGARASHI OSAMU
IPC分类号： B60R11/02 , F01N1/00 , G10K11/16 , G10K11/178 , H04R5/04 , H04S5/00
摘要： PURPOSE:To prevent the divergence of adaptive active noise elimination control for the engine booming noise in the car room by increasing the stability of a control system. CONSTITUTION:Phase delay angles of vibration noises to engine exciting forces at respective rotational frequencies are found previously and stored in a ROM 3a. Then the phase of a reference signal to be filtered according to the engine rotational frequency has its delay corrected with the data in the ROM 3a to generate a secondary sound output signal 103, with which a secondary sound is generated by a speaker 6 and made to interfere with the filling noise, thereby performing noise elimination. Consequently, the engine rotational frequency does not decrease suddenly and the filling noise and secondary sound never become out of phase more speedily to prevent a noise increase, i.e., the divergence.

8. 发明专利

JPH05303386A 失效
公开(公告)号：JPH05303386A
公开(公告)日：1993-11-16
申请号：JP10999292
申请日：1992-04-28
申请人： HITACHI LTD , NISSAN MOTOR
发明人： NAKAMURA MITSURU , SATO KENJI , SASAKI MITSUHIDE , SAITO HIROYUKI , HASEGAWA SATOSHI , TABATA TOSHIYUKI
IPC分类号： B60R11/02 , G10K11/16 , G10K11/178
摘要： PURPOSE:To detect a divergence phenomenon in which secondary sounds become louder than the noise being controlled because a muffler control is not performed normally in an active muffler device which actively cancels noises by secondary sounds. CONSTITUTION:A phase amplitude controlling circuit 9 in a microprocessor 2 controls phases and amplitudes of secondary sounds through the sound pressure detected by a microphone 4 and the fundamental vibration frequency of an engine 1, outputs the secondary sounds to a compartment from a speaker 5 so as to muffle the noise with the secondary sounds. When the control system becomes unstable due to the secular degradation of a car, the secondary sounds become louder than the noise in the compartment, the noises increase and the output of the secondary sounds may require to be stopped. Thus, a divergence predicting circuit 2 constantly monitors the output power of a digital filter which generates the secondary sounds and when the output power exceeds a threshold value integrated over a prescribed time, it is discriminated to be a divergence occurs and stops the output of the secondary sounds.

9. 发明专利

JPH0566782A ACTIVE MUFFLER FOR VEHICLE ROOM 失效
公开(公告)号：JPH0566782A
公开(公告)日：1993-03-19
申请号：JP22806591
申请日：1991-09-09
申请人： NISSAN MOTOR , HITACHI LTD
发明人： NAKAMURA MITSURU , SASAKI MITSUHIDE , SATO KENJI , HASEGAWA SATOSHI , IGARASHI OSAMU
IPC分类号： B60R11/02 , B60R16/02 , G10K11/16 , G10K11/178 , H04M1/60
摘要： PURPOSE:To prevent malfunction due to an electrical noise from occurring and to simplify electrical filter constitution by comprising a mechanical acoustic filter by utilizing ceiling space between the roof and the roof lining of a vehicle. CONSTITUTION:A mechanical acoustic filter 14 is comprised by utilizing the ceiling space between a roof 4 and the roof lining 5 of the vehicle in an active muffler in which at least one microphone 15 by which the noise in the room 2 is measured, and one speaker 7 from which a secondary tone to muffle the room 2 is outputted based on the measured result of the microphone 15 are provided. To attain such purpose, the function of low-pass filter for the filled tone of an engine 11 can be provided by setting reduction peak on a frequency area higher than a low frequency area where the filled tone of an engine 11 exists. Thereby, it is possible to prevent the malfunction due to the electrical noise from occurring, and to simplify the structure of an electrical acoustic filter.

10. 发明专利

DE4201146C2 未知
公开(公告)号：DE4201146C2
公开(公告)日：2003-01-30
申请号：DE4201146
申请日：1992-01-17
申请人： HITACHI LTD
发明人： NAKAMURA MITSURU , YAMAKADO MAKOTO
IPC分类号： B60G17/018 , B60G17/019 , B60G17/0195 , B60G21/10 , B60K23/08 , B60K26/00 , B60K28/16 , B60K31/00 , B60R16/02 , B60T8/00 , B60T8/1755 , B60T8/60 , B62D6/00 , F02D41/10 , F16D48/12 , B60K41/00
摘要： A system for detecting a physical amount of behavior of a vehicle includes, acceleration sensors arranged on at least two longitudinal axes of the vehicle, the vertical axis Of the vehicle and the lateral axis of the vehicle, a plurality of the acceleration sensors being disposed on each of the axes. A unit is provided for establishing a conversion equation for determining acceleration values of linear motion at an arbitrary point of the vehicle in the direction of each axis of an arbitrary coordinate system and acceleration values of rotational motion with respect to the each axis of the coordinate system while simultaneously using acceleration values detected by the acceleration sensors disposed on at least two of the vehicular longitudinal axes, the vertical axis and the lateral axis. There is also provided a unit for calculating the conversion equation to obtain the acceleration values of linear motion at an arbitrary point of the vehicle in the direction of each axis of the arbitrary coordinate system and acceleration values of rotational motion with respect to each axis of the coordinate system, a unit for establishing a motion equation expressing a plurality of freedom motions, and a unit for calculating the motion equation with the acceleration values of linear motion at an arbitrary point of the vehicle in the direction of each axis of the arbitrary axis of the arbitrary coordinate system and acceleration values of rotational motion with respect to the each axis of the coordinate system to obtain the physical amount associated with the behavior of the vehicle.

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