Engine control system
First Claim
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1. An internal combustion engine comprising:
- an engine body;
an intake system connected to the engine body for introducing air thereto from outside the engine, the system including a throttle valve for controlling the amount of air introduced;
an exhaust system connected to the engine body for removing resultant combustion gas therefrom;
sensor means arranged in the intake system at a position downstream of the throttle valve, said sensor means being responsive only to the partial pressure of oxygen in the air newly introduced from outside the engine and providing an electrical signal indicating the amount of new air introduced;
calculating means, responsive to the sensed amount of new air introduced, for calculating values of an engine operational characteristic to be controlled as a function of the amount of newly introduced air; and
control means, responsive to the calculated engine operational characteristic value, for controlling the engine operational characteristic as a function of the amount of newly introduced air.
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Abstract
An engine control system having an oxygen density sensor arranged in an intake system at a position downstream of a throttle valve for detecting the amount of air newly introduced into the engine. The sensor is a limit electric current detection type capable of detecting a continuously changing density of the oxygen. An amount of fuel to be injected is calculated in accordance with the output level of the sensor by using mapped data of the output level of the sensor signal. A precise detection of new air is made possible while maintaining the advantages of the known D-J system. An ignition timing also may be calculated by the signal from the oxygen sensor.
51 Citations
16 Claims
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1. An internal combustion engine comprising:
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an engine body; an intake system connected to the engine body for introducing air thereto from outside the engine, the system including a throttle valve for controlling the amount of air introduced; an exhaust system connected to the engine body for removing resultant combustion gas therefrom; sensor means arranged in the intake system at a position downstream of the throttle valve, said sensor means being responsive only to the partial pressure of oxygen in the air newly introduced from outside the engine and providing an electrical signal indicating the amount of new air introduced; calculating means, responsive to the sensed amount of new air introduced, for calculating values of an engine operational characteristic to be controlled as a function of the amount of newly introduced air; and control means, responsive to the calculated engine operational characteristic value, for controlling the engine operational characteristic as a function of the amount of newly introduced air. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 14, 15, 16)
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9. An internal combustion engine comprising:
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an engine body; an intake system connected to the engine body for introducing air thereto, the system including a throttle valve for controlling the amount of air introduced; an exhaust system connected to the engine body for removing resulting combustion gas therefrom; an exhaust gas recirculating system for connecting the exhaust system to the intake system for selectively recirculating an amount of exhaust gas to the intake system in accordance with a present engine operating condition; sensor means arranged in the intake system at a position downstream of the throttle valve, said sensor means being responsive to the partial pressure of oxygen in the introduced air and providing an electric signal indicating the amount of air introduced; means for storing data of an amount of fuel to be introduced into the engine in accordance with a value of the amount of new air introduced, said data being determined and adapted for the exhaust gas recirculation operation; calculating means, responsive to the sensed amount of air introduced, for calculating a value of an amount of introduced fuel by using the stored data; and means for introducing the calculated amount of fuel into the engine. - View Dependent Claims (10, 11, 12, 13)
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Specification