Method for improving engine compression efficiency and saving fuel oil

The invention discloses a method combining an oxygen sensor improved structure and a surface ceramic recombination metal wear self-repair technology for improving engine compression efficiency and saving fuel oil. An aeration area of an oxygen sensor is reduced to 3-30% of an original aeration area by the oxygen sensor improved structure, the oxygen content in the exhaust gas detected by the oxygen sensor is lower than the actual content, and thus a deception signal is sent to an ECU, being in a rich oil state is received by an oil injection control module by mistake, and thus the oil injection quantity is reduced. The surface ceramic recombination metal wear self-repair technology enhances the cylinder pressure by 20-45%, the compression efficiency is improved, and an ideal oil-gas mixture ratio ignition mode of a traditional gasoline engine is enabled to qualitative change to a high compression ratio and rare oil-gas mixture ratio ignition pressure explosion type combustion mode. According to the method, an