| 摘要 |
In a system for delivering secondary air from an air pump to either the exhaust manifold, preferably, closely adjacent to the exhaust ports, or to a converter in the exhaust system of an internal combustion engine, an integral air switching diverter valve assembly having an inlet connected to the air pump, a primary discharge outlet for delivery of air to the exhaust manifold and a secondary discharge outlet for delivery of air to the converter, a valve being mounted in the assembly for movement between a first or converter mode position at which it is normally positioned to allow secondary air flow to the converter while blocking secondary air flow to the exhaust manifold and a second or port mode position to allow secondary air flow to the exhaust manifold while blocking air flow to the converter, the assembly including a differential pressure operated switching diaphragm assembly used to effect movement of the valve between the port and converter modes, a divert timing assembly operative during deceleration to effect switching to the converter mode, and a pressure relief outlet which is operative during the port or converter switching modes to discharge, at a selected pressure, excess secondary air to the atmosphere.
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