Robust system for sound enhancement from a single engine sensor
AssigneeMahle International GmbH
InventorManish Vaishya
Life of this patent
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Abstract
A noise enhancement system for an automobile utilizes a single input of engine speed to derive a control signal used to drive a speaker. The speaker generates sounds that enhance or replicate the desired sounds from the engine. The output from the speaker is crafted dependent on the vehicle operating conditions. Instead of multiple transducers and inputs the noise enhancement system of this invention utilizes the single input of engine RPM engine speed. By utilizing only engine speed, the noise enhancement system is cost effective and significantly less complex.
Claims12
An active noise control system, comprising:
- a speaker for generating a noise enhancement signal;
- and
- a controller that controls the speaker with a control signal corresponding to the noise enhancement signal, the controller receiving only one signal obtained from a vehicle tachometer indicative of engine speed and deriving additional values required from the received vehicle tachometer for calculating the control signal based upon a predicted future engine sound, wherein the predicted future engine sound is determined using input signal from the vehicle tachometer and a value derived from the input signal from the vehicle tachometer indicative of engine angular acceleration.
An active noise control system, comprising:
- a speaker for generating a noise enhancement signal;
- and
- a controller that controls the speaker with a control signal corresponding to the noise enhancement signal, the controller determines an estimated engine speed acceleration using one signal indicative of engine speed and generates the control signal based upon the one signal indicative of engine speed, wherein said controller determines an acoustic gain based on the following relationship, and other metrics:
- β
-
-
- 1
- =
- 1
- 4
-
- (
- Ω
- 2000
- )
- +
- sgn
-
- (
- Ω
- .
- )
- ×
- (
- Ω
- .
- 400
- )
- 2
- where:
- Ω=engine speed;
- {dot over (Ω)}=engine angular acceleration;
- and
- β1=acoustic gain.
A method of controlling an active noise control system, comprising:
- a) detecting only one signal indicative of engine speed from a vehicle tachometer;
- b) determining an engine angular acceleration based on the one signal indicative of engine speed received from the vehicle;
- c) predicting a future engine sound based on the one signal indicative engine speed and the angular acceleration determined based on the one signal indicative of engine speed from the vehicle;
- and
- d) calculating a noise control signal based on the predicted future engine sound.
A method of controlling an active noise control system, comprising:
- detecting one signal indicative of engine speed;
- determining an engine angular acceleration based on the signal indicative of engine speed;
- generating a noise control signal using the engine speed and the angular acceleration;
- predicting vehicle driving conditions based on the one signal indicative of engine speed;
- and
- determining an acoustic gain value based on the predicted vehicle driving conditions, wherein said step of determining an acoustic gain value further comprises determining an acoustic gain value according to the following relationship, and other metrics:
- β1
- =
- 1
- 4
-
- (
- Ω
- 2000
- )
- +
- sgn
-
- (
- Ω
- .
- )
- ×
- (
- Ω
- .
- 400
- )
- 2
- where:
- Ω=engine speed;
- {dot over (Ω)}=engine angular acceleration;
- and
- β1=acoustic gain.
Dependencies are inferred from the claim text.