Methods and apparatus for monitoring the performance of hydrocar

Details Methods and apparatus for monitoring the performance of hydrocar Methods and apparatus for monitoring the performance of hydrocar

1994-12-27

1996-06-11

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60279, 60297, 60311, F01N 328

Patent

active

055244335

ABSTRACT:
Methods and apparatus are provided for monitoring the performance of a hydrocarbon trapping device which removes hydrocarbons from an engine exhaust stream during cold startup conditions before the catalyst has reached its light-off temperature. The electronic engine controller which provides conventional fuel control functions is used to numerically integrate sensed values during a predetermined time interval in the engine's startup period. The sensed values indicate the rate at which hydrocarbons are being retained or purged by the trap, and the result of the integration indicates the total amount of hydrocarbon molecules trapped or purged. The integration result values may be retained for future readout during diagnostic procedures, and the result values may be compared with a threshold value to generate an alarm indication whenever the integration result value indicates that the trap is not performing satisfactorily.

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