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A system for a vehicle having an engine with an exhaust comprises a fuel cell coupled in the engine exhaust wherein the fuel cell has an output circuit; a battery coupled with the fuel cell; and a controller receiving a signal indicative of an electric output of the fuel cell output circuit, and adj

A system for a vehicle having an engine with an exhaust comprises a fuel cell coupled in the engine exhaust wherein the fuel cell has an output circuit; a battery coupled with the fuel cell; and a controller receiving a signal indicative of an electric output of the fuel cell output circuit, and adjusting one of the fuel amount and the air amount supplied to the engine in response to said signal to affect air-fuel ratio of the exhaust of the engine.

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1. A system for a vehicle having an engine with an exhaust, the system comprising: a fuel cell coupled in the engine exhaust wherein the fuel cell has an output circuit coupled across an anode and cathode of the fuel cell;a battery coupled with the fuel cell; anda controller including a computer rea

1. A system for a vehicle having an engine with an exhaust, the system comprising: a fuel cell coupled in the engine exhaust wherein the fuel cell has an output circuit coupled across an anode and cathode of the fuel cell;a battery coupled with the fuel cell; anda controller including a computer readable storage medium with code programmed therein, including code for receiving a signal indicative of an electrical output of the fuel cell output circuit, and code for adjusting one of a fuel amount and an air amount supplied to the engine in response to said signal to bring air-to-fuel ratio of the exhaust of the engine to a desired engine air-to-fuel ratio, said signal providing an air-to-fuel ratio feedback adjustment. 2. The system of claim 1, wherein the electrical output is one of a current, voltage, and impedance of the output circuit coupled across the anode and cathode of the fuel cell. 3. The system of claim 1, wherein the computer readable storage medium further includes code for adjusting the fuel and air amounts according to an exhaust ratio which is inferred from the electrical output and exhaust temperature. 4. The system of claim 1, wherein the computer readable storage medium further includes code for adjusting an applied current to the fuel cell and said signal is indicative of a change in the current of the fuel cell. 5. The system of claim 1, wherein the computer readable storage medium further includes code for diagnosing degradation of the fuel cell based on the electrical output of the fuel cell. 6. The system of claim 1, wherein the system further comprises at least one air fuel sensor, and wherein the computer readable storage medium further includes code for diagnosing degradation of the at least one air fuel sensor based on the electrical output of the fuel cell. 7. The system of claim 1, wherein the fuel cell is one of a solid oxide fuel cell, molten carbonate fuel cell, and proton exchange membrane fuel cell. 8. The system of claim 1, wherein the system has no air-to-fuel ratio sensors immediately upstream and no air-to-fuel ratio sensors immediately downstream of the fuel cell. 9. A method to operate a vehicle's internal combustion engine having a fuel cell disposed downstream of the engine coupled in an engine exhaust and a battery coupled with the fuel cell, comprising: adjusting an air-to-fuel ratio of the engine to bring the air-to-fuel ratio to a desired air-to-fuel ratio in response to an electrical output electrically coupled across the fuel cell between an anode and a cathode of the fuel cell in the engine exhaust. 10. The method of claim 9, where adjusting the air-to-fuel ratio of the engine comprises varying the air-to-fuel ratio entering an intake manifold of the engine. 11. The method of claim 9, where adjusting the air-to-fuel ratio of the engine comprises varying one or more of a number of lean-operating cylinders of the engine and a number of rich-operating cylinders of the engine. 12. The method of claim 9, where adjusting the air-to-fuel ratio of the engine comprises varying a number of unfueled cylinders of the engine. 13. The method of claim 9, wherein the electrical output is a voltage, the method further comprising supplying current to the fuel cell from the battery during adjusting of the air-to-fuel ratio of the engine in response to the electrical output of the fuel cell coupled in the engine exhaust.