Deactivation of high pressure pump for noise control

1. An engine control system comprising:

an engine speed monitoring module that compares an engine speed and a first predetermined threshold;

a pump control module that deactivates a pressure pump in response to said engine speed being less than said first predetermined threshold for at least a predetermined amount of time, and that reactivates said pressure pump in response to said engine speed being greater than a second predetermined threshold; and

a fuel injector module that changes fuel injector timing and a fuel injector pulse width in response to deactivating said pressure pump and said engine speed being less than said first predetermined threshold.

2. The engine control system of claim 1 wherein said pump control module deactivates said pressure pump by adjusting a valve.

3. The engine control system of claim 1 wherein said engine speed being less than said first predetermined threshold corresponds to engine idle.

4. An engine control method comprising:

comparing an engine speed and a first predetermined threshold;

deactivating a pressure pump in response to said engine speed being less than said first predetermined threshold for at least a predetermined amount of time;

reactivating said pressure pump in response to said engine speed being greater than a second predetermined threshold; and

changing fuel injector timing and a fuel injector pulse width in response to deactivating said pressure pump and said engine speed being less than said first predetermined threshold.

5. The engine control method of claim 4 further comprising deactivating said pressure pump by adjusting a valve.

6. The engine control method of claim 4 wherein

said engine speed being less than said first predetermined threshold corresponds to engine idle.