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    • 51. 发明授权
    • Vehicular air-pollution preventive
    • 预防空气污染
    • US3732696A
    • 1973-05-15
    • US3732696D
    • 1971-05-05
    • NISSAN MOTOR
    • MASAKI K
    • F01N3/18F01N3/20F01N3/26F01N3/38F02M25/07F02N19/10F02B75/10F02M31/06
    • F02N19/10F01N3/18F01N3/2033F01N3/26F01N3/38F01N2240/02F02M26/36F02M26/53Y02A50/2322Y02T10/26
    • Herein disclosed are arrangements for use in reducing concentrations of unburned hydrocarbons and carbon-monoxides contained in the exhaust gases from gasoline-powered internal combustion engines for motor vehicles especially during engine warm-up operation in which the unburned hydrocarbons and carbonmonoxides are emitted in high concentrations due to the low temperatures of the engine exhaust gases and the engine cooling medium. Such arrangements are adapted to heat the engine exhaust gases when the exhaust gases and/or the cooling medium are maintained at temperatures lower than a predetermined level. The arrangements may be such that not only the engine exhaust gases but the engine cooling medium is heated concurrently yet independently, wherein only the exhaust gases may be heated if the temperature of the exhaust gases decreases under the predetermined level. Means may also be provided in combination with these arrangements so as to forcedly supply fresh air into the exhaust system for assisting in the re-combustion of the exhaust gases therein.
    • 本文公开了用于降低来自用于机动车辆的来自汽油动力内燃机的废气中所含的未燃烧的碳氢化合物和一氧化碳的浓度的布置,特别是在未燃烧的碳氢化合物和一氧化碳被排放的发动机预热运行期间 由于发动机废气和发动机冷却介质的低温引起的高浓度。 当废气和/或冷却介质保持在低于预定水平的温度时,这种装置适于加热发动机废气。 这种布置可以不仅是发动机排气而且是发动机冷却介质同时被加热但是独立地加热,其中如果废气的温度在预定水平以下降低,则只有排气才能被加热。 还可以结合这些装置提供装置,以便强制地将新鲜空气供应到排气系统中,以帮助其中的废气再燃。