EP 0625773 A3 19951018 - Engine noise control apparatus.
Title (en)
Engine noise control apparatus.
Title (de)
Motorlärmkontrollegerät.
Title (fr)
Dispositif pour contrÔler de bruit d'un moteur.
Publication
Application
Priority
JP 14272893 A 19930521
Abstract (en)
[origin: EP0625773A2] An engine noise control apparatus which is capable of effectively reducing or waveform-reshaping a wide range of engine noise. The apparatus has an engine rotating speed sensor (5) for detecting an engine rotating speed and a waveform generator circuit (46) for converting a rotation pulse signal to a periodic signal having a frequency which is a predetermined multiple of the detected engine rotating speed. The output of an air flow meter (3) is passed through a bandpass filter (41) and a rectifier circuit (42) to generate a control signal which is an average value of alternating current components of the output. A CPU (44), with reference to a map previously stored in a memory (45), modifies the phase and amplitude of the periodic signal with respect to an engine rotation reference signal based on the rotation pulse signal and the control signal, and outputs the modified signal as driving signals to operate speakers (6A, 6B) disposed in an intake tube and an exhaust tube for reducing noise. <IMAGE>
IPC 1-7
IPC 8 full level
F01N 1/06 (2006.01); F02B 77/13 (2006.01); G10K 11/178 (2006.01)
CPC (source: EP US)
F01N 1/065 (2013.01 - EP US); G10K 11/17823 (2017.12 - EP US); G10K 11/17853 (2017.12 - EP US); G10K 11/17873 (2017.12 - EP US); G10K 2210/107 (2013.01 - EP); G10K 2210/112 (2013.01 - EP); G10K 2210/1282 (2013.01 - EP); G10K 2210/12822 (2013.01 - EP); G10K 2210/3027 (2013.01 - EP); G10K 2210/3032 (2013.01 - EP); G10K 2210/3033 (2013.01 - EP); G10K 2210/3039 (2013.01 - EP); G10K 2210/3046 (2013.01 - EP); G10K 2210/51 (2013.01 - EP)
Citation (search report)
- [YA] EP 0098594 A2 19840118 - NISSAN MOTOR [JP]
- [Y] EP 0479367 A2 19920408 - GEN MOTORS CORP [US]
- [A] DE 4041182 A1 19920625 - BUDERUS HEIZTECHNIK GMBH [DE]
- [A] FR 2531023 A1 19840203 - PEUGEOT [FR]
- [A] GB 2254979 A 19921021 - ROVER GROUP [GB]
- [A] EP 0410685 A2 19910130 - NISSAN MOTOR [JP]
Designated contracting state (EPC)
AT BE CH DE DK ES FR GB GR IE IT LI LU MC NL PT SE
DOCDB simple family (publication)
EP 0625773 A2 19941123; EP 0625773 A3 19951018; JP H06330763 A 19941129
DOCDB simple family (application)
EP 94107760 A 19940519; JP 14272893 A 19930521