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Fuel control systems for internal combustion engines

  • US 4,279,230 A
  • Filed: 05/02/1978
  • Issued: 07/21/1981
  • Est. Priority Date: 05/06/1977
  • Status: Expired due to Term
First Claim
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1. A fuel control system for an internal combustion engine having an exhaust conduit, comprising:

  • a probe in the exhaust conduit adapted to generate an electrical signal indicative of exhaust conditions,at least one circuit for supplying fuel and air to the engine, having solenoid valve means for metering at least the fuel flow rate in said circuit and opening into an air induction passage provided with an operator controlled throttle member downstream of the opening of said one circuit,a closed loop electronic control circuit connected to said probe and effective to control said solenoid valve means in dependence of said signal,and means for opening the loop responsive to predetermined operating conditions of the engine,said electronic circuit having further means for controlling said solenoid valve means in dependence on at least one engine operating parameter other than said exhaust conditions during open loop operation.

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