| 摘要 |
An exhaust emissions control system includes a valve in an exhaust stream portion of a mainstream exhaust ahead of an aftertreatment element such as a catalytic converter. The valve controls the amount of exhaust flowing into a hydrocarbon reformer. A bi-directional acoustical air meter in the exhaust stream portion ahead of the reformer measures the velocity of the exhaust stream portion, and a computer determines the amount of combustion needed in the converter at all times, adjusts the amount of hydrocarbon fuel provided to the reformer, and adjusts the position of the valve to provide the optimum amount of exhaust gas flow into the reformer to achieve a desired temperature in the converter.
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