Intake sound control unsing pure feedforward method with order-based offline calibration

• US 20040156511A1
• Filed: 09/25/2003
• Published: 08/12/2004
• Est. Priority Date: 11/01/2002
• Status: Abandoned Application

• Current Assignee: Continental Automotive GmbH (Continental AG)
• Original Assignee: Continental Automotive GmbH (Continental AG)
• Inventors: Vaishya, Manish
• Application Number:
  US10/670,443
• Publication Number:
  US 20040156511A1
• Time in Patent Office: Days
• US Class Current: 381/71.8
• CPC Class Codes: G10K 11/1781 characterised by the analysis of input or output signals, e.g. frequency range, modes, transfer functions
• CPC Class Codes: G10K 11/17857 Geometric disposition, e.g. placement of microphones
• CPC Class Codes: G10K 11/17873 using a reference signal without an error signal, e.g. pure feedforward
• CPC Class Codes: G10K 2210/30232 Transfer functions, e.g. impulse response
• CPC Class Codes: G10K 2210/504 Calibration

Abstract

A method for controlling induction sound of an internal combustion engine is described. The method includes computing a first sound pressure during a run up of the engine, wherein the first sound pressure is based on each order of sound generated by the engine. Next, the engine is operated engine under a plurality of operating conditions and a second sound pressure is computed for each of the operating conditions. A frequency response of a microphone and a speaker used in computing the first and second sound pressures is then determined. The method further includes obtaining current vehicle operating conditions and decomposing the first and second sound pressures and the frequency response into engine orders. A net control signal is then generated, wherein the signal is based on each of the first and second sound pressures, the frequency response and the vehicle operating conditions so as to independently control individual orders of the engine sound.

Claims

1. Method for controlling induction sound of an internal combustion engine, comprising:

(a) determining a first sound pressure during a run up of said engine, wherein said first sound pressure is based on each order of sound generated by said engine;

(b) operating said engine under a plurality of operating conditions;

(c) determining a second sound pressure for each of said operating conditions;

(e) obtaining current vehicle operating conditions;

(f) decomposing said first and second sound pressures and said frequency response into engine orders; and

(g) generating a net control signal based on each of said first and second sound pressures and said vehicle operating conditions to control said sound wherein each individual order is controlled independently.

2. The method according to claim 1 further including determining a frequency response of a microphone and a speaker used in computing said first and second sound pressures.

3. The method according to claim 1 wherein said vehicle operating conditions are obtained by a transceiver from a vehicle databus.

4. The method according to claim 1 further including applying a gain factor for attenuating said sound.

5. The method according to claim 1 further including applying a gain factor for enhancing said sound.

6. The method according to claim 1 wherein said determining a second pressure level includes computing a correction factor for each of said operating conditions.

7. The method according to claim 1 wherein said net control signal drives a speaker for providing audio output for controlling said sound.

8. The method according to claim 7, wherein said net control signal is amplified prior to driving said speaker.

9. The method according to claim 1 wherein said decomposing said first and second sound pressures and said frequency response into engine orders includes generation of look-up tables.

10. The method according to claim 9 further including a microcontroller for storing said look-up tables.

11. The method according to claim 1 further including an algorithm that utilizes a Nyqist criterion.

12. The method according to claim 1 further including a time delay between said engine operating conditions.

14. The method according to claim 1 wherein said vehicle operating conditions are obtained by a transceiver from a vehicle databus.

13. Method for controlling induction sound of an internal combustion engine, comprising:

(a) computing a first sound pressure during a run up of said engine, wherein said first sound pressure is based on each order of sound generated by said engine;

(b) operating said engine under a plurality of operating conditions;

(c) computing a second sound pressure for each of said operating conditions;

(d) computing a frequency response of a microphone and a speaker used in computing said first and second sound pressures;

(e) obtaining current vehicle operating conditions;

(f) decomposing said first and second sound pressures and said frequency response into engine orders; and

(g) generating a net control signal in real time based on each of said first and second sound pressures, said frequency response and said vehicle operating conditions to independently control individual orders of said sound.

15. The method according to claim 13 further including applying a gain factor for attenuating said sound.

16. The method according to claim 13 further including applying a gain factor for enhancing said sound.

17. The method according to claim 13 wherein said determining a second pressure level includes computing a correction factor for each of said operating conditions.

18. The method according to claim 13 wherein said net control signal drives a speaker for providing audio output for controlling said sound.

19. The method according to claim 13, wherein said net control signal is amplified prior to driving said speaker.

20. A method for controlling induction sound of an internal combustion engine, comprising:

providing first look up tables based on a determination of a first sound pressure during a run up of said engine, wherein said first sound pressure is based on each order of sound generated by said engine;

providing second look up tables based on a determination of a second sound pressure, wherein said second sound pressure is computed for each of a plurality of operating conditions of said engine; and

obtaining current vehicle operating conditions; and

generating a net control signal based on said first and second sound pressures, wherein each individual order is controlled independently.