Ignition timing control device for spark-ignition type engine
First Claim
1. An ignition timing control device for a spark-ignition type engine having an exhaust passage, a combustion chamber, and a spark plug arranged in the combustion chamber, the device comprising:
- an oxygen concentration sensor arranged in the exhaust passage for detecting the oxygen concentration in the exhaust gas;
an air-fuel ratio control means for controlling the fuel amount to be fed to the engine on the basis of the output signal of the oxygen concentration sensor to make the air-fuel ratio equal to the stoichiometric air-fuel ratio which is determined in accordance with the composition of the fuel;
an air-fuel ratio sensor arranged in the exhaust passage for detecting the air-fuel ratio to detect the actual stoichiometric air-fuel ratio; and
ignition timing control means for controlling the ignition timing in accordance with the actual stoichiometric air-fuel ratio.
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Accused Products
Abstract
An ignition timing control device for a spark-ignition type engine comprises an oxygen concentration sensor and an air-fuel ratio sensor arranged in the exhaust passage of the engine. The fuel amount to be fed to the engine is controlled on the basis of the output signal of the oxygen concentration sensor to make the air-fuel ratio equal to the stoichiometric air-fuel ratio, which depends on the composition of the fuel burned in the engine. The air-fuel ratio sensor detects the actual air-fuel ratio, i.e., the stoichiometric air-fuel ratio of the burned fuel. The relationships between the stoichiometric air-fuel ratio of the burned fuel and the suitable ignition timing is obtained in advance and the ignition timing is corrected in accordance with the detected stoichiometric air-fuel ratio.
15 Citations
9 Claims
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1. An ignition timing control device for a spark-ignition type engine having an exhaust passage, a combustion chamber, and a spark plug arranged in the combustion chamber, the device comprising:
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an oxygen concentration sensor arranged in the exhaust passage for detecting the oxygen concentration in the exhaust gas; an air-fuel ratio control means for controlling the fuel amount to be fed to the engine on the basis of the output signal of the oxygen concentration sensor to make the air-fuel ratio equal to the stoichiometric air-fuel ratio which is determined in accordance with the composition of the fuel; an air-fuel ratio sensor arranged in the exhaust passage for detecting the air-fuel ratio to detect the actual stoichiometric air-fuel ratio; and ignition timing control means for controlling the ignition timing in accordance with the actual stoichiometric air-fuel ratio. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification