Air induction system having an integrated resonator

1. An air induction system for carrying air to the intake of an internal combustion engine, comprising:

a first housing including a surface at least partially enclosing a first chamber located in the first housing, an inlet through which air enters the first chamber, an outlet passage through which air exits the first chamber and passes to the engine intake, and a first partition that separates the outlet passage and a first port;

a second housing secured to the surface and enclosing a second chamber, the second housing including the first port through which the second chamber communicates with the outlet passage, and a second partition that contacts the first partition and provides a boundary of the second chamber, the first partition and second partition at least partially providing a boundary of the first port; and

a mass air flow sensor located in the outlet passage.

2. The air induction system of claim 1 wherein the second chamber and outlet passage comprise at least a portion of a Helmholtz resonator.

3. The air induction system of claim 1 wherein:

the second housing further encloses a third chamber; and

the second housing further includes a second port through which the third chamber communicates with the outlet passage, and the second partition separates the second chamber from the third chamber, the first partition and second partition at least partially providing a boundary of the second port.

4. The air induction system of claim 1 wherein the second chamber comprises at least a portion of a quarter wave tuner.

5. The air induction system of claim 1 wherein:

the mass air flow sensor extends through a wall surrounding the outlet passage, the sensor including a first portion located in the outlet passage and a second portion located external to the outlet passage.

6. The air induction system of claim 1 wherein the second housing is secured to the surface by one of welding, a gasket and fasteners, and a leak-proof seal.

7. An air induction system for carrying air to the intake of an internal combustion engine, comprising:

a first housing including an upper surface at least partially enclosing a first chamber located in the first housing, an inlet through which air enters the first chamber, a neck directed laterally from the first chamber and including an outlet passage, through which air exits the first chamber and passes to the engine intake, and a first partition that separates the outlet passage and a first port;

a second housing secured to the upper surface and enclosing a second chamber, the second housing including a first port through which the second chamber communicates with the outlet passage, a second partition that contacts the first partition and provides a boundary of the second chamber, the first partition and second partition at least partially providing a boundary of the first port; and

a mass air flow sensor extending through a wall of the neck and including a first portion located in the outlet passage and a second portion located external to the outlet passage.

8. The air induction system of claim 7 wherein the second chamber and outlet passage comprise at least a portion of a Helmholtz resonator.

9. The air induction system of claim 7 wherein:

the second housing and the outer surface further enclose a third chamber; and

the second housing further includes a second port through which the third chamber communicates with the outlet passage, and the second partition separates the second chamber from the third chamber, the first partition and second partition at least partially providing a boundary of the second port.

10. The air induction system of claim 7 wherein the second chamber comprises at least a portion of a quarter wave tuner.

11. The air induction system of claim 7 wherein the neck is cylindrical having a longitudinal axis, and the outlet pass age is substantially parallel to the axis.