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US 6,283,105 B1Granted
Single-cylinder 4-cycle engine
AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorAkihito Kasai
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AssigneeHonda Giken Kogyo Kabushiki Kaisha
InventorAkihito Kasai
Estimating the term…
In a single-cylinder 4-cycle engine including an oxygen concentration sensor provided at a location upstream of an exhaust emission control catalyst, the influence of pulsation of the exhaust gas is eliminated to enhance the detection accuracy by detecting of the concentration of oxygen in the exhaust gas. A first pulse generator generates a pair of pulse signals a and b per one rotation of a crankshaft, and a second pulse generator generates pulse signals c and d at every very small angle of rotation of the crankshaft. The angular speed of the crankshaft is detected from the interval of the pulse signals c and d. The pulse signal output a when the angular speed is smaller is determined as being the output during a compression stroke, and is used as an ignition signal a1. The pulse signal output a when the angular speed is larger is determined as being the output during an exhaust stroke, and is used as an oxygen concentration detecting signal a2.
A single-cylinder 4-cycle engine comprising an engine having an exhaust port, an exhaust emission control catalyst for purifying the exhaust gas, an oxygen concentration sensor positioned between said exhaust port and said exhaust emission control catalyst, for detecting the oxygen concentration in the exhaust gas, and control means, coupled to said oxygen concentration sensor, for feedback-controlling the amount of fuel supplied to the engine based upon the output of said oxygen concentration sensor during the exhaust stroke of said engine,
Dependencies are inferred from the claim text.