Method and apparatus for actively influencing the intake noise of an internal combustion engine
First Claim
1. An apparatus for actively influencing intake noise of an internal combustion engine by generating a correcting noise and superimposing the correcting noise on an intake noise produced by the engine, said apparatus comprising:
- a control system for processing an engine speed signal D, at least one further engine parameter P, a reference noise signal S and an actual noise signal I to generate a control signal A, an engine speed signal source connected to the control system for providing said engine speed signal D, a noise sensor connected to said control system for sensing an actual noise and for producing said actual noise signal I, and an electromechanical converter connected to an output of said control system for receiving said control signal A and generating the correcting noise to be superimposed on the intake noise in dependence on said control signal A, wherein the control system comprises;
means for generating the control signal A with a frequency dependent on the engine speed signal D, means for comparing the actual noise signal I and the reference noise signal S and generating a comparison signal V, and means for adjusting the level and phase of the control signal A in dependence on a comparison signal V.
1 Assignment
0 Petitions
Accused Products
Abstract
A method and apparatus for actively influencing the intake noise of an internal combustion engine. The apparatus comprises a controller (7) which senses the actual noise (I) via a microphone (16) and compares the actual noise with a reference noise signal which depends on the engine speed D and at least one further engine parameter P, such as, for example, the throttle (12) position. A comparison signal V generated by comparing the actual noise to the reference noise value is used to adjust a control signal Asum, which also depends on the engine speed D. The control signal is fed to an electromechanical transducer (14) which generates a correcting noise (20) which is superimposed on the intake noise (21) to produce the resultant actual noise (22), which should correspond as closely as possible to the reference noise value. The invention makes it possible to reduce the intake noise or to tailor the intake noise to a desired sound within the limits of the electromechanical transducer output so that, for example, a driver can be given an acoustic feedback under specified operating conditions.
-
Citations
7 Claims
-
1. An apparatus for actively influencing intake noise of an internal combustion engine by generating a correcting noise and superimposing the correcting noise on an intake noise produced by the engine, said apparatus comprising:
-
a control system for processing an engine speed signal D, at least one further engine parameter P, a reference noise signal S and an actual noise signal I to generate a control signal A, an engine speed signal source connected to the control system for providing said engine speed signal D, a noise sensor connected to said control system for sensing an actual noise and for producing said actual noise signal I, and an electromechanical converter connected to an output of said control system for receiving said control signal A and generating the correcting noise to be superimposed on the intake noise in dependence on said control signal A, wherein the control system comprises;
means for generating the control signal A with a frequency dependent on the engine speed signal D, means for comparing the actual noise signal I and the reference noise signal S and generating a comparison signal V, and means for adjusting the level and phase of the control signal A in dependence on a comparison signal V. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
Specification