Oil octane number self-learning method and system

Abstract

The invention relates to an oil octane number self-learning method and system. The method comprises the following steps that a knocking intensity coefficient of an engine is divided into a low knocking intensity grade, a medium knocking intensity grade and a high knocking intensity grade; a knocking intensity grade of each cylinder of the current engine is judged; the number of times of knock of each cylinder of the engine at the low, medium and high knock intensity grades are counted; whether an engine oil octane number meets a self-learning condition or not is judged; and when the oil octanenumber self-learning condition is met, engine oil octane number self-learning and updating are carried out. The embodiment of the invention provides the oil octane number self-learning method and system, a learning method for identifying the oil octane number is designed in an engine control system, the knocking intensity is divided into the three different knocking grades, the oil octane numberis reduced to different degrees under different grade conditions, and the identified octane number is used as adjustment input of ignition advance angle control, so that the probability of the knock of the engine is reduced, and the damage of the frequent knock to the engine is reduced.

Description

technical field [0001] This application relates to engine knocking and ignition angle control, in particular to a method and system for self-learning the octane number of oil products. Background technique [0002] Gasoline engine knock is an abnormal combustion in the cylinder. Severe knocking will destroy the oil film on the cylinder wall, aggravate the wear of the cylinder wall, or directly cause damage to parts such as pistons and valves. At present, poor engine manufacturing, carbon deposits in cylinders, high intake air temperature, overheating of the engine, and use of inferior or low-octane gasoline may all cause engine knocking. Modern engine control systems are designed with knock control logic. By reading the signal of the knock sensor installed on the engine block, it is judged whether knocking occurs. shock. [0003] Due to differences in production processes and storage conditions, the octane number of the same oil will change. After the vehicle is filled w...

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Problems solved by technology

[0006] The embodiment of the present application provides a method and system for self-learning the octane number of oil products to solve the problem that the learning method for identifying the octane number of oil products is not designed in the engine control system in the related art, due to differences in production processes and storage conditions, etc. When the octane number of the same oil product changes, the probability of engine knocking is high, causing damage to the engine

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