Engine noise control apparatus

A sound control apparatus comprising:

• engine rotating speed detecting means for detecting a rotating speed of an engine;
• engine load detecting means for detecting a load of said engine;
• signal generation means for generating an oscillation signal having a frequency which is proportional to said detected engine rotating speed;
• memory means including a control map for storing data of phases and amplitudes at a plurality of different addresses, said phases and said amplitudes corresponding to an engine rotating speed and an engine load;
• signal modulation means for phase-controlling and amplitude-controlling said oscillation signal in accordance with a phase and an amplitude read from said control map using an address determined by both the detected engine rotating speed and the detected engine load;
• control sound generation means for generating control sound in accordance with the signal of said signal modulation means and for supplying said control sound to a propagation path of the sound;
• said engine load detecting means comprising a sensor for detecting a signal representing a flow rate of intake air supplied to said engine to be used for engine control, and detection means for detecting pulsation components of intake air flow supplied to said engine on the basis of a signal outputted by said sensor, said detection means detecting said pulsation components of intake air supplied to said engine;
• and
• control signal generation means for generating a control signal in accordance with a magnitude of said detected pulsation components of said intake air supplied to said engine, wherein said control signal generation means takes an average of peak values of said pulsation components for cylinders of said engine in a corresponding predetermined period to generate said control signal for each of said cylinders of said engine, and wherein said signal modulation means modulates said oscillation signal on the basis of said each control signal.