Apparatus and method for influencing oscillations in the passenger compartment of a motor vehicle and apparatus and method for detecting defects in a motor vehicle

• US 5,748,748 A
• Filed: 08/23/1996
• Issued: 05/05/1998
• Est. Priority Date: 08/26/1995
• Status: Expired due to Fees

• Current Assignee: Fichtel & Sachs AG
• Original Assignee: Fichtel & Sachs AG
• Inventors: Feldhaus, Reinhard, Fischer, Matthias, Orlamunder, Andreas
• Primary Examiner(s): Kuntz, Curtis
• Assistant Examiner(s): CHIN, VIVIAN C
• Application Number:
  US08/701,984
• Time in Patent Office: 620 Days
• Field of Search: 381/71.1, 381/86, 381/94.1, 381/71.4, 381/71.3, 381/73.1
• US Class Current: 381/71.4
• CPC Class Codes: G10K 11/17823 Reference signals, e.g. ambient acoustic environment
• CPC Class Codes: G10K 11/17825 Error signals
• CPC Class Codes: G10K 11/17833 by using a self-diagnostic function or a malfunction prevention function, e.g. detecting abnormal output levels
• CPC Class Codes: G10K 11/17853 of the filter
• CPC Class Codes: G10K 11/17857 Geometric disposition, e.g. placement of microphones
• CPC Class Codes: G10K 11/17883 the reference signal being derived from a machine operating condition, e.g. engine RPM or vehicle speed
• CPC Class Codes: G10K 2210/117 Nonlinear
• CPC Class Codes: G10K 2210/1282 Automobiles
• CPC Class Codes: G10K 2210/3027 Feedforward
• CPC Class Codes: G10K 2210/3033 Information contained in memory, e.g. stored signals or transfer functions
• CPC Class Codes: G10K 2210/3053 Speeding up computation or convergence, or decreasing the computational load
• CPC Class Codes: G10K 2210/3221 Headrests, seats or the like, for personal ANC systems

Abstract

An apparatus for modifying noise oscillations in a passenger compartment (12) of a motor vehicle (14) includes a memory device (38) for storing a plurality of predetermined oscillation patterns (SM), an operating condition determination device (18) for determining an operating condition (BZ) of the motor vehicle (14), a selector device (36) for selecting an oscillation pattern (SM) as a function of the determined operating condition (BZ) of the motor vehicle (14), and an oscillation generator device (39-42-44) for generating oscillations corresponding to the selected oscillation pattern (SM) into the passenger compartment (12) of the motor vehicle (14).

Claims

1. An apparatus for modifying noise oscillations transmitted to a passenger compartment of a vehicle, said noise oscillations being transmitted to said passenger compartment of said vehicle as a result of operation of said vehicle, said apparatus comprising:

memory means for storing a plurality of oscillation patterns;

operating condition determination means for determining at least one operating condition of said vehicle;

selector means for receiving said at least one operating condition from said operating condition determination means and for selecting an oscillation pattern from said plurality of oscillation patterns stored in said memory means based upon said at least one operating condition received from said operating condition determination means;

oscillation generation means for generating oscillations into said passenger compartment of said vehicle, said generated oscillations generated by said oscillation generation means corresponding to said selected oscillation pattern selected by said selector means from said plurality of oscillation patterns stored in said memory means;

said oscillation generation means comprising;

tripping means for generating a tripping signal; and

oscillator means for receiving said tripping signal and for generating said oscillations in said passenger compartment of said vehicle which are substantially in phase opposition to said noise oscillations transmitted to said passenger compartment of said vehicle as said result of said operation of said vehicle;

said tripping means comprising oscillation sensor means for detecting oscillations in said passenger compartment of said vehicle;

said oscillation sensor means being disposed substantially within said passenger compartment of said vehicle;

said tripping means additionally comprising;

envelope curve generator means for generating an envelope family of curves;

said envelope family of curves generated by said envelope curve generator means changing in phase with regard to said noise oscillations as a function of said at least one operating condition of said vehicle; and

tripping signal generator means for generating said tripping signal when said envelope family of curves substantially completely covers said noise oscillation for a determined period of time;

said vehicle comprises an engine for propelling said vehicle, a throttle for supplying fuel to said engine, and a transmission for transferring power from said engine;

said operating condition determination means comprising at least one of;

engine speed sensor means for measuring a speed of said engine;

vehicle speed sensor means for measuring a speed of said vehicle;

throttle valve sensor means for measuring a degree of opening of said throttle;

gear sensor means for determining a currently engaged gear of said transmission;

at least one longitudinal acceleration sensor means for determining a longitudinal acceleration of said vehicle;

at least one lateral acceleration sensor means for determining a lateral acceleration of said vehicle; and

at least one load sensor for determining a load condition of said vehicle;

monitoring means for determining and monitoring the operation of said apparatus for modifying noise oscillation transmitted to said passenger compartment of said vehicle;

display means for generating a signal indicative of improper operation of said apparatus for modifying noise oscillation transmitted to said passenger compartment of said vehicle;

tuning means for generating at least some of said plurality of determined oscillation patterns;

interface means for connecting said tuning means to said memory means and for transferring said at least some of said plurality of determined oscillation patterns from said tuning means to said memory means;

said tuning means comprising;

additional oscillation sensor means being positioned in said passenger compartment of said vehicle;

said additional oscillation sensor means being for the detection of a resultant oscillation resulting from the superimposition of said noise oscillations and said oscillations generated in said passenger compartment of said vehicle by said oscillator means for a selected one of said plurality of determined oscillation patterns; and

optimization means for the frequency-specific modification of said selected one of said plurality of oscillation pattern;

said optimization means comprising;

comparator means for comparing the amplitude of said resultant oscillation with a threshold value and for generating a comparator signal; and

oscillation pattern modification means for modifying said selected one of said plurality of oscillation patterns to minimize the amplitude of said resultant oscillation.

2. An apparatus for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 1:

wherein said comparator means additionally comprises means for comparing said resultant oscillation at a plurality of oscillation frequencies with said threshold value, said threshold value having a magnitude varying with said oscillation frequency; and

wherein said oscillation pattern modification means additionally comprises means for modifying said selected one of said plurality of oscillation patterns to minimize the amplitude of said resultant oscillation determined as a function of said comparator signal.

3. An apparatus for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 1:

wherein said oscillations generated in said passenger compartment by said oscillator means comprise acoustical oscillations;

wherein said oscillator means comprises at least one loudspeaker, said at least one loudspeaker being disposed within said passenger compartment of said vehicle; and

wherein said oscillation sensor means comprises at least one microphone.

4. An apparatus for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 3:

wherein said vehicle comprises a vehicle audio system; and

wherein said at least one loudspeaker comprises a portion of said vehicle audio system.

5. An apparatus for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 4:

wherein said vehicle includes a position for a passenger of said vehicle and a position for the ears of the passenger of said vehicle when said vehicle is in motion; and

wherein said at least one microphone is disposed substantially adjacent said position for the ears of the passenger of said vehicle when said vehicle is in motion.

6. An apparatus for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 1:

wherein said vehicle comprises a vehicle seat for supporting a passenger of said vehicle, differential gearing means and at least one vehicle axle;

wherein said oscillations generated in said passenger compartment by said oscillator means comprises physical vibrations; and

wherein said oscillator means comprises at least one of;

active bearing means for transmitting said physical vibrations to said vehicle seat;

active bearing means for transmitting said physical vibrations to said differential gearing means; and

active bearing means for transmitting said physical vibrations to said at least one vehicle axle; and

wherein said oscillation sensor means comprises at least one physical vibration sensor.

7. A method for modifying noise oscillations (P) transmitted to a passenger compartment of a vehicle, said noise oscillations (P) being transmitted to said passenger compartment of said vehicle as a result of operation of said vehicle, said method comprising the steps of:

providing memory means for storing a plurality of determined oscillation patterns;

determining an operating condition (BZ) of said vehicle;

selecting an oscillation pattern (SM) from said plurality of determined oscillation patterns stored in said memory means;

said selected oscillation pattern (SM) being selected from said plurality of determined oscillation patterns as a function of said determined operating condition (BZ) of said vehicle;

generating oscillations (S) into said passenger compartment of said vehicle;

said oscillations (S) generated into said passenger compartment of said vehicle corresponding to said selected oscillation pattern (SM);

said oscillations (S) generated into said passenger compartment of said vehicle corresponding to said selected oscillation pattern (SM) are in phase opposition to said noise oscillations (P) transmitted to said passenger compartment of said vehicle as said result of said operation of said vehicle;

generating an envelope family of curves (H) as a function of said determined operating condition (BZ) of said vehicle;

the phase of said generated envelope family of curves changing with respect to said noise oscillations (P);

tripping said output of said oscillations (S) corresponding to said selected oscillation pattern (SM) in said passenger compartment of said vehicle when said generated envelope family of curves (H) has substantially completely covered said noise oscillations (P) for a period of time;

said vehicle includes a vehicle body, an engine, a throttle for supplying said engine with fuel, and a transmission for transferring power from said engine;

said determined operating condition (BZ) of said vehicle comprises at least one of;

a speed of said engine;

a speed of said vehicle;

a degree of opening of said throttle;

a currently engaged gear of said transmission;

a longitudinal acceleration of said vehicle body;

a lateral acceleration of said vehicle body; and

a load condition of said vehicle;

providing monitoring means for monitoring the operation of said method for modifying noise oscillations transmitted to said passenger compartment of said vehicle and for generating a signal indicating improper operation of said method;

operating said monitoring means to thereby provide to an operator of said vehicle said signal indicating improper operation of said method;

defining said plurality of oscillation patterns stored in said memory means as a function of a plurality of determined operating conditions of said vehicle;

superimposing at least;

said noise oscillations (P); and

said oscillations (S) generated into said passenger compartment of said vehicle and corresponding to said selected oscillation pattern (SM);

forming a resultant oscillation from said superimposition of said noise oscillations (P) and said oscillations (S) generated into said passenger compartment of said vehicle;

modifying said selected oscillation pattern (SM) to substantially minimize the amplitude of said resultant oscillation;

said selected oscillation pattern (SM) being modified over a plurality of frequencies of said selected oscillation pattern (SM);

comparing the amplitude of said resultant oscillation to a threshold value (T); and

modifying said selected oscillation pattern (SM) to substantially minimize said amplitude of said resultant oscillation.

8. A method for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 7, said method additionally comprising the further steps of:

comparing said resultant oscillation at a plurality of oscillation frequencies with said threshold value, said threshold value having a magnitude varying with said oscillation frequency; and

modifying said selected one of said plurality of oscillation patterns to minimize the amplitude of said resultant oscillation determined as a function of said comparator signal.

9. A method for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 7:

wherein said oscillations (S) generated into said passenger compartment of said vehicle comprise acoustical oscillations;

wherein said step of generating said oscillations (S) into said passenger compartment of said vehicle comprises the steps of;

providing at least one loudspeaker disposed within said passenger compartment of said vehicle;

generating said oscillations (S) into said passenger compartment of said vehicle through said at least one loudspeaker;

providing at least one microphone disposed within said passenger compartment of said vehicle; and

detecting said resultant oscillation through said at least one microphone.

10. A method for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 7:

wherein said vehicle includes at least one passenger seat disposed in said passenger compartment of said vehicle, transmission means, differential means and an axle;

wherein said oscillations (S) generated into said passenger compartment of said vehicle comprise physical vibrations;

wherein said oscillations'"'"' (S) generated into said passenger compartment of said vehicle and corresponding to said selected oscillation pattern (SM) are generated through at least one of;

active bearing means disposed in said at least one passenger seat;

active bearing means disposed in said transmission means;

active bearing means disposed said differential means; and

active bearing means disposed in said axle; and

wherein said method comprises the additional steps of;

disposing at least one physical vibration sensor in said passenger compartment of said vehicle; and

detecting said resultant oscillations through said at least one physical vibration sensor.

11. An apparatus for modifying noise oscillations transmitted to a passenger compartment of a vehicle, said noise oscillations being transmitted to said passenger compartment of said vehicle as a result of operation of said vehicle, said apparatus comprising:

memory means for storing a plurality of oscillation patterns;

first sensor means for determining at least one operating condition of said vehicle;

selector means for receiving said at least one operating condition from said first sensor means and for selecting an oscillation pattern from said plurality of oscillation patterns stored in said memory means based upon said at least one operating condition received from said first sensor means;

oscillation generation means for generating oscillations into said passenger compartment of said vehicle, said generated oscillations generated by said oscillation generation means corresponding to said selected oscillation pattern selected by said selector means from said plurality of oscillation patterns stored in said memory means;

second sensor means being positioned in said passenger compartment of said vehicle;

said second sensor means being for the detection of a resultant oscillation resulting from a superimposition of said noise oscillations and said oscillations generated in said passenger compartment of said vehicle by said oscillation generation means for a selected one of said plurality of determined oscillation patterns; and

oscillation pattern modification means for modifying said selected one of said plurality of oscillation patterns to minimize the amplitude of said resultant oscillation.

12. The apparatus for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 11, said apparatus comprising:

tuning means for generating at least some of said plurality of oscillation patterns; and

interface means for connecting said tuning means to said memory means and for transferring said at least some of said plurality of oscillation patterns from said tuning means to said memory means.

13. The apparatus for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 12, wherein said oscillation pattern modification means comprises:

comparator means for comparing the amplitude of said resultant oscillation with a threshold value and for generating a comparator signal; and

means for modifying said selected one of said plurality of oscillation patterns to minimize the amplitude of said resultant oscillation in response to said comparator signal.

14. The apparatus for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 13, wherein:

said oscillation generation means comprises;

tripping means for generating a tripping signal; and

oscillator means for receiving said tripping signal and for generating said oscillations in said passenger compartment of said vehicle which are substantially in phase opposition to said noise oscillations transmitted to said passenger compartment of said vehicle as said result of said operation of said vehicle.

15. The apparatus for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 14, wherein:

said tripping means comprises oscillation sensor means for detecting oscillations in said passenger compartment of said vehicle; and

said oscillation sensor means being disposed substantially within said passenger compartment of said vehicle.

16. The apparatus for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 15, wherein said tripping means additionally comprises:

envelope curve generator means for generating an envelope family of curves changing in phase with regard to said noise oscillations as a function of said at least one operating condition of said vehicle; and

tripping signal generator means for generating said tripping signal when said envelope family of curves substantially completely covers said noise oscillation for a determined period of time.

17. The apparatus for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 16, wherein:

said vehicle comprises an engine for propelling said vehicle, a throttle for supplying fuel to said engine, and a transmission for transferring power from said engine; and

said first sensor means comprises at least one of;

engine speed sensor means for measuring a speed of said engine;

vehicle speed sensor means for measuring a speed of said vehicle;

throttle valve sensor means for measuring a degree of opening of said throttle;

gear sensor means for determining a currently engaged gear of said transmission;

at least one longitudinal acceleration sensor means for determining a longitudinal acceleration of said vehicle;

at least one lateral acceleration sensor means for determining a lateral acceleration of said vehicle; and

at least one load sensor for determining a load condition of said vehicle.

18. The apparatus for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 17, said apparatus comprising:

monitoring means for determining and monitoring the operation of said apparatus for modifying noise oscillation transmitted to said passenger compartment of said vehicle; and

display means for generating a signal indicative of improper operation of said apparatus for modifying noise oscillation transmitted to said passenger compartment of said vehicle.

19. The apparatus for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 18, wherein:

said vehicle comprises a vehicle seat for supporting a passenger of said vehicle, differential gearing means and at least one vehicle axle;

said oscillator means for generating oscillations in said passenger compartment comprises means for generating physical vibrations; and

said oscillator means comprises at least one of;

active bearing means for transmitting said physical vibrations to said vehicle seat;

active bearing means for transmitting said physical vibrations to said differential gearing means; and

active bearing means for transmitting said physical vibrations to said at least one vehicle axle; and

said oscillation sensor means comprises at least one physical vibration sensor.

20. The apparatus for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 18, wherein:

said comparator means additionally comprises means for comparing said resultant oscillation at a plurality of oscillation frequencies with said threshold value; and

said threshold value having a magnitude varying with said oscillation frequency.

21. The apparatus for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 20, wherein:

said oscillator means for generating oscillations in said passenger compartment comprises means for generating acoustical oscillations;

said oscillator means comprises at least one loudspeaker;

said at least one loudspeaker being disposed within said passenger compartment of said vehicle; and

said oscillation sensor means comprises at least one microphone.

22. The apparatus for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 21, wherein:

said vehicle comprises a vehicle audio system; and

said at least one loudspeaker comprises a portion of said vehicle audio system.

23. The apparatus for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 22, wherein:

said vehicle includes a position for a passenger of said vehicle and a position for the ears of the passenger of said vehicle when said vehicle is in motion; and

said at least one microphone is disposed substantially adjacent to said position for the ears of the passenger of said vehicle when said vehicle is in motion.

24. A method for modifying noise oscillations transmitted to a passenger compartment of a vehicle, said noise oscillations being transmitted to said passenger compartment of said vehicle as a result of operation of said vehicle, said method comprising the steps of:

providing memory means for storing a plurality of determined oscillation patterns;

determining an operating condition of said vehicle;

selecting an oscillation pattern from said plurality of determined oscillation patterns stored in said memory means;

said selected oscillation pattern being selected from said plurality of determined oscillation patterns as a function of said determined operating condition of said vehicle;

generating oscillations into said passenger compartment of said vehicle;

said oscillations generated into said passenger compartment of said vehicle corresponding to said selected oscillation pattern;

superimposing at least;

said noise oscillations; and

said oscillations generated into said passenger compartment of said vehicle and corresponding to said selected oscillation pattern;

forming a resultant oscillation from said superimposition of said noise oscillations and said oscillations generated into said passenger compartment of said vehicle; and

modifying said selected oscillation pattern to substantially minimize the amplitude of said resultant oscillation.

25. The method for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 24, said method additionally comprising the steps of:

comparing the amplitude of said resultant oscillation to a threshold value; and

modifying said selected oscillation pattern to substantially minimize said amplitude of said resultant oscillation.

26. The method for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 25, said method comprises the additional steps of:

generating an envelope family of curves as a function of said determined operating condition of said vehicle;

changing the phase of said generated envelope family of curves with respect to said noise oscillations; and

tripping an output of said oscillations corresponding to said selected oscillation pattern in said passenger compartment of said vehicle when said generated envelope family of curves has substantially completely covered said noise oscillations for a period of time.

27. The method for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 26, wherein:

said step of generating oscillations into said passenger compartment of said vehicle comprises generating oscillations in phase opposition to said noise oscillations transmitted to said passenger compartment of said vehicle as said result of said operation of said vehicle.

28. The method for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 27, wherein:

said vehicle includes a vehicle body, an engine, a throttle for supplying said engine with fuel, and a transmission for transferring power from said engine; and

said step of determining an operating condition of said vehicle comprises determining at least one of;

a speed of said engine;

a speed of said vehicle;

a degree of opening of said throttle;

a currently engaged gear of said transmission;

a longitudinal acceleration of said vehicle body;

a lateral acceleration of said vehicle body; and

a load condition of said vehicle.

29. The method for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 28, said method comprises the additional steps of:

providing monitoring means for monitoring the operation of said method for modifying noise oscillations transmitted to said passenger compartment of said vehicle and for generating a signal indicating improper operation of said method; and

operating said monitoring means to thereby provide to an operator of said vehicle said signal indicating improper operation of said method.

30. The method for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 29, said method comprises the additional step of defining said plurality of oscillation patterns stored in said memory means as a function of a plurality of determined operating conditions of said vehicle.

31. The method for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 30, said method additionally comprising the steps of:

comparing said resultant oscillation at a plurality of oscillation frequencies with said threshold value, said threshold value having a magnitude varying with said oscillation frequency;

modifying said selected one of said plurality of oscillation patterns to minimize the amplitude of said resultant oscillation determined as a function of said comparator signal; and

modifying said selected oscillation pattern over a plurality of frequencies of said selected oscillation pattern.

32. The method for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 31, wherein:

said vehicle includes at least one passenger seat disposed in said passenger compartment of said vehicle, transmission means, differential means and an axle;

said oscillations generated into said passenger compartment of said vehicle comprise physical vibrations;

said step of generating said oscillations into said passenger compartment of said vehicle comprises generating said oscillations through at least one of;

active bearing means disposed in said at least one passenger seat;

active bearing means disposed in said transmission means;

active bearing means disposed said differential means; and

active bearing means disposed in said axle;

said method comprises the additional steps of;

disposing at least one physical vibration sensor in said passenger compartment of said vehicle; and

detecting said resultant oscillations through said at least one physical vibration sensor.

33. The method for modifying noise oscillations transmitted to a passenger compartment of a vehicle according to claim 31, wherein:

said oscillations generated into said passenger compartment of said vehicle comprise acoustical oscillations;

said step of generating said oscillations into said passenger compartment of said vehicle comprises the steps of;

providing at least one loudspeaker disposed within said passenger compartment of said vehicle;

generating said oscillations into said passenger compartment of said vehicle through said at least one loudspeaker;

providing at least one microphone disposed within said passenger compartment of said vehicle; and

detecting said resultant oscillation through said at least one microphone.