Air injection timed with exhaust release
AssigneeFord Global Technologies, LLC
InventorsManish Sharma, Gopichandra Surnilla
Life of this patent
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Abstract
Embodiments for injecting air into exhaust ports of an engine are provided. In one example, a multi-cylinder engine method comprises combusting a rich air-fuel mixture, injecting air into a first cylinder's exhaust port and not into a second cylinder's exhaust port during the first cylinder's exhaust stroke, and injecting air into the second cylinder's exhaust port and not into the first cylinder's exhaust port during the second cylinder's exhaust stroke. In this way, injection into each exhaust port may be timed with exhaust release into each exhaust port.
Claims20
A multi-cylinder engine method, comprising:
- combusting a rich air-fuel mixture;
- injecting air into a first cylinder's exhaust port and not into a second cylinder's exhaust port during the first cylinder's exhaust stroke;
- and
- injecting air into the second cylinder's exhaust port and not into the first cylinder's exhaust port during the second cylinder's exhaust stroke.
A multi-cylinder engine method, comprising:
- combusting a rich air-fuel mixture;
- injecting air from a pressurized air supply into a first cylinder's exhaust port only during the first cylinder's exhaust stroke via a first connection mechanically timed to the engine's camshaft;
- and
- injecting air from the air supply into a second cylinder's exhaust port only during the second cylinder's exhaust stroke via a second connection mechanically timed to the engine's camshaft.
A system for an engine, comprising:
- a first cylinder having a first exhaust port and a second cylinder having a second exhaust port, each exhaust port coupled to an exhaust including an emission control device;
- a rotating disc coupled to an engine camshaft;
- and
- an air pump injecting air sequentially to the first and second exhaust ports, the sequential injection from the air pump controlled via the rotating disc.
Dependencies are inferred from the claim text.