초록 ▼

An insulation blanket is applied around the exhaust manifold of an internal combustion engine to maintain higher exhaust gas temperature in the manifold, thus both to enhance oxidation of unburned hydrocarbons therein and also to reduce ambient air contact with the exterior of the manifold to reduce

An insulation blanket is applied around the exhaust manifold of an internal combustion engine to maintain higher exhaust gas temperature in the manifold, thus both to enhance oxidation of unburned hydrocarbons therein and also to reduce ambient air contact with the exterior of the manifold to reduce passive formation of NO.sub.x.

대표청구항 ▼

[ What is claimed is:] [1.] Thermal insulation for reducing passive formation of NOx and reducing unburned hydrocarbons, comprising:an internal combustion engine having an exhaust gas manifold, a thermal insulation blanket positioned on said exhaust gas manifold and retained thereon by fasteners pen

[ What is claimed is:] [1.] Thermal insulation for reducing passive formation of NOx and reducing unburned hydrocarbons, comprising:an internal combustion engine having an exhaust gas manifold, a thermal insulation blanket positioned on said exhaust gas manifold and retained thereon by fasteners penetrating the blanket to reduce heat loss from said exhaust gas manifold, so that the internal combustion engine exhaust gas temperature is operated at a higher level than in the absence of such insulation both to enhance hydrocarbon combustion in the exhaust gas in the manifold and also to inhibit ambient air from engaging on the exterior surface of said manifold so as to reduce the passive formation of NOx resulting from ambient air coming into contact with the exterior of the hot manifold.