Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
  • B60R99/00—Subject matter not provided for in other groups of this subclass
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60Q—ARRANGEMENT OF SIGNALLING OR LIGHTING DEVICES, THE MOUNTING OR SUPPORTING THEREOF OR CIRCUITS THEREFOR, FOR VEHICLES IN GENERAL
  • B60Q5/00—Arrangement or adaptation of acoustic signal devices
• • G—PHYSICS
  • G10—MUSICAL INSTRUMENTS; ACOUSTICS
  • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
  • G10K15/00—Acoustics not otherwise provided for
  • G10K15/02—Synthesis of acoustic waves

Definitions

• the invention relates to a method and a device for generating noise corresponding to the operation of an internal combustion engine in the interior of a motor vehicle.
• the invention is based on the object of solving the problem of giving the driver a realistic subjective feeling for current driving conditions, even in the case of very comfortable, extremely noise-damped vehicles.
• the method according to claim 1 provides a solution to the problem of the invention.
• the claim 2 is directed to a device for solving the object of the invention.
• FIG. 1 schematically shows the intake system of a four-cylinder internal combustion engine
• Fig2ü is a block diagram of the device according to the invention.
• FIG. 5 shows a detail of a block diagram modified compared to FIG. 4:
• an internal combustion engine 6 has four cylinders 8, to which individual suction
• the individual suction pipes 10 are connected to one another via a distributor pipe 12, which via a collective suction pipe 14 Air filter 16 is connected.
• a throttle valve 18 is provided for power control, which is missing in a diesel engine and can be replaced by a different power setting process.
• An air collector 19 can be arranged between the throttle valve 18 and the air filter 16.
• a pressure sensor 20 is advantageously arranged upstream of the throttle valve 18 on the air collector 19 or between the air collector and the air filter 16 and detects pressure fluctuations in the fresh air flow or fresh charge supplied to the cylinders 8.
• FIG. 2 shows an enlarged section of FIG. 1.
• the manifold 14 has a hole 22 in its wall with which a pressure-sensitive input window 24 of the pressure sensor 20 is aligned.
• the pressure sensor 20 is fastened to the manifold suction pipe 14 in a manner known per se, for example by screwing, gluing, etc., the inlet window 24 advantageously bordering directly on the hole 22.
• a pressure-sensitive component 26, for example a piezo element, is arranged in the interior of the pressure sensor 20 and is connected to outputs 29 via electronics 28.
• Pressure fluctuations at hole 22 are to be detected with pressure sensor 20.
• the pressure-sensitive component 26 is therefore designed and arranged such that it responds to these pressure fluctuations. It can be designed as an absolute pressure sensor. Since the absolute pressure is not essential in the present case, but rather the detection of pressure fluctuations is important, the component 26 is advantageously designed as a differential pressure sensor which detects the difference between the pressure on its front side, i.e. the pressure in the hole 22, and the pressure on its rear side, the pressure on the rear side advantageously being the ambient air pressure.
• the pressure sensor 20 advantageously has a wide frequency range from, for example, 1 Hz to 10 kHz and is temperature-compensated.
• a pressure sensor Sor is used, for example, in the doors of motor vehicles as a side impact crash sensor and is commercially available under the name Siemens Pressure Satellite for Sidecrash Tests, EBM16.
• the pressure sensor 20 is advantageously highly dynamic, with its broad frequency range ensuring that steep rising or falling edges of the stochastic pressure signals are correctly detected.
• the structure-borne noise transmitted via the connection is hardly detected by the pressure sensor.
• the pressure-sensitive component 26 is a piezo element that reacts to changes in the pressure difference effective on its end faces with changes in the electrical voltage between its end faces.
• the platelet-shaped component 26 is hermetically sealed in an elastomeric envelope 30, which is formed on its end face facing the hole 22 as a thin membrane, which offers virtually no resistance to pressure fluctuations.
• the casing 30 is received together with the component 26 in a holder 31 which is fastened to the collecting suction pipe 14.
• structure-borne noise is decoupled between that of the intake manifold wall and the component 26 at least in the frequency ranges of interest.
• the connection of the component 26 to the wall of the suction pipe is such that, in contrast to the large-area excitation caused by fluctuations in air pressure, it is hardly excited by structure-borne noise.
• Fig. 4 shows a block diagram of the arrangement.
• a filter device 32 is connected downstream of the sensor 20, which in turn is followed by an amplifier 33, the output of which is connected to a loudspeaker 34.
• the frequency response of the filter device 32 is determined by a modulation device 36, with which the amplification factor of the amplifier 33 can also be changed.
• Inputs of the modulation device 36 are connected to a sensor 38 for sensing the position of a power control element, a sensor 40 for sensing the vehicle speed, a sensor 42 for sensing a gear lever position and a switch 44.
• the structure of the filter device 32, the amplifier 33 and the modulation device 36 and the sensors 38, 40 and 42 is known per se and is therefore not explained.
• the charge flow through the manifold 14 oscillates according to the excitation by the engine.
• Pressure fluctuations in the flow in the manifold 14 are detected by means of the pressure sensor 20 and, owing to the high sensitivity and dynamics of the pressure sensor, are converted into output signals which represent the suction oscillations or pressure fluctuations.
• These pressure fluctuations directly contain information about the speed and the load under which the engine is running, the load information being extremely dynamic, in particular in the arrangement according to FIG. 1, in which the pressure sensor 20 is located upstream of the throttle valve 20.
• the output signal of the pressure sensor 20 is processed by the filter device 32 and amplified in the amplifier 33 and then reproduced by the loudspeaker 34.
• 32 frequencies above 300 Hz are attenuated by the filter device, which leads to a pleasant noise which is not clouded by disruptive interference.
• Humming frequencies below 30 Hz or 30 to 40 Hz are also suppressed so as not to generate any subjectively unpleasant noises.
• Such a filter device is simple and therefore inexpensive to implement. Even with extraordinarily well soundproofed vehicle interiors, in which wind noises, rolling noises etc. are no longer audible, a noise corresponding to the operation of the engine can be generated in this way, which is subjectively perceived as engine noise and about the driving condition of the vehicle or the lei - Engine submission informed and enables the driver to make a realistic assessment.
• the frequency response of the filter device 32 can be matched to the respective vehicle.
• the frequency response of the filter device 32 can be made dependent on the accelerator pedal position, the vehicle speed and / or the selector lever position of a transmission by means of the modulation device 36.
• the gain of amplifier 33 may depend on these factors. For example, when a selector lever is in a sports position, the frequency spectrum can be slightly increased and the amplification factor can be increased towards higher speeds or with increasing position of the power control element. Different sound characteristics can be set by means of the switch 44.
• the Modulation device 36 a map memory, in which a speed map is stored, in which a respective engine speed is stored in accordance with a conventional drive train, for example provided with a stepped automatic transmission, as a function of the accelerator pedal position and the driving speed.
• the Isr speed is detected by a speed sensor 46, so that a respective frequency multiplication factor can be calculated, which is fed to an active module 48. In this way, the engine noise of a CVT vehicle perceptible in the interior can be adapted to that of a conventional vehicle.
• the intake vibration contains information about the speed and torque, which is highly dynamic especially when it is detected upstream of a throttle valve, since the throttle valve smoothes the dynamics in the distributor pipe 12, for example when idling or when the vehicle is rolling or pushing, so that there are only slight fluctuations in the intake manifold 14. which increase sharply with increasing opening of the throttle valve.
• the device described can be modified in many ways.
• a wide variety of highly dynamic pressure sensors can be used.
• the pressure sensor can be arranged directly inside the collecting suction pipe, on the air collector 19 or elsewhere in such a way that it detects fluctuations in suction pressure. It is also possible to arrange the pressure sensor upstream of the air filter 16.
• the device described can be integrated into the audio system of a motor vehicle, with modern radio devices already containing amplifiers which automatically adapt the amplification factor to the vehicle speed.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Acoustics & Sound (AREA)
• Health & Medical Sciences (AREA)
• Audiology, Speech & Language Pathology (AREA)
• General Health & Medical Sciences (AREA)
• Multimedia (AREA)
• Exhaust Silencers (AREA)
• Combined Controls Of Internal Combustion Engines (AREA)
• Fittings On The Vehicle Exterior For Carrying Loads, And Devices For Holding Or Mounting Articles (AREA)
• Soundproofing, Sound Blocking, And Sound Damping (AREA)

Priority Applications (4)

Applications Claiming Priority (2)

Publications (1)

Family

ID=7874038

Family Applications (1)

Country Status (6)

Cited By (10)

Families Citing this family (42)

Citations (4)

Family Cites Families (17)

• 1998
  • 1998-07-14 DE DE19831576A patent/DE19831576A1/de not_active Withdrawn
• 1999
  • 1999-07-13 DE DE59903104T patent/DE59903104D1/de not_active Expired - Lifetime
  • 1999-07-13 JP JP2000560571A patent/JP2002520680A/ja active Pending
  • 1999-07-13 EP EP99936529A patent/EP1097445B1/de not_active Expired - Lifetime
  • 1999-07-13 WO PCT/EP1999/004953 patent/WO2000004532A1/de not_active Ceased
  • 1999-07-13 ES ES99936529T patent/ES2181460T3/es not_active Expired - Lifetime
  • 1999-07-13 US US09/744,096 patent/US7088829B1/en not_active Expired - Fee Related

Patent Citations (4)

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