Fuel control systems for internal combustion engines
First Claim
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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Accused Products
Abstract
A fuel control system comprises a probe in contact with the exhaust gases, a circuit for supplying fuel and air to the engine, having a solenoid valve for metering at least the fuel flow, a closed-loop electronic control circuit connected to the probe and energizing the solenoid valve in dependence on the signal from the probe. The loop is opened responsive to predetermined operating conditions of the engine. Further means control the solenoid valve in dependence on another engine operating parameter during open-loop operation. A memory is provided for storing a value representative of the control of the solenoid valve means during closed-loop operation.
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Citations
22 Claims
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1. A fuel control system for an internal combustion engine having an exhaust conduit, comprising:
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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. - View Dependent Claims (2, 6, 7, 8, 9, 11, 15, 17, 19, 21)
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3. 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, 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 means for providing a value representative of the average adjustment of the solenoid value means during closed-loop operation for a time period corresponding to several successive operating cycles of the engine, memory means connected to a voltage source for permanently storing said value when said engine is not operating and means for controlling the solenoid valve upon opening of said loop which adjusts said solenoid valve at a value which is in direct relation with the stored value modified in response to a signal from a sensor operating in response to an operating parameter of the engine.
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18. A fuel control system for an internal combustion engine having an exhaust conduit, comprising:
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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, a closed loop electronic control circuit connected to said probe and effective to control said solenoid valve means in dependence of said signal, memory means for storing a value corresponding to a setting of said valve means during closed loop operation; and means for opening the loop responsive to predetermined operating conditions of the engine, wherein, during open loop idling operation, the closed-loop electronic circuit presets the solenoid valve or an additional flow-regulating solenoid valve at a predetermined setting, which is related to the value contained in said memory means for storing an earlier adjustment of the valve.
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Specification