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Carburetor kit for improved air-fuel mixture

  • US 5,460,149 A
  • Filed: 05/10/1994
  • Issued: 10/24/1995
  • Est. Priority Date: 02/10/1993
  • Status: Expired due to Fees
First Claim
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1. A carburetor kit for improving the emissions of internal-combustion engines having an exhaust manifold generating a positive-pressure gas stream and a carburetor wherein an air-fuel mixture is produced by drawing fuel from a fuel float chamber into an air stream flowing through a venturi tube as a result of a vacuum provided at an intake manifold, comprising:

  • (a) first pneumatic passage means for connecting the float chamber of the carburetor and the exhaust manifold, so that a positive pressure differential is available for application to the float chamber;

    (b) second pneumatic passage means for connecting the float chamber and the intake manifold, so that a negative pressure differential is available for application to the float chamber;

    (c) first valve means for controlling the flow rate through said first pneumatic passage means;

    (d) second valve means for controlling the flow rate through said second pneumatic passage means;

    (e) sensor means for measuring the oxygen content of exhaust gases of the engine and for generating a signal corresponding to said oxygen content; and

    (f) first electronic control means for actuating said first valve means in response to the signal generated by said sensor means, such that a flow rate through said first valve means is progressively reduced as the oxygen content in the exhaust gases decreases and is progressively increased as the oxygen content in the exhaust gases increases; and

    for actuating said second valve means in response to the signal generated by said sensor means, such that a flow rate through said second valve means is progressively reduced as the oxygen content in the exhaust gases increases and is progressively increased as the oxygen content in the exhaust gases decreases.

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