Air-fuel ratio adjusting method and device

Abstract

The invention discloses an air-fuel ratio adjusting method and a device. The air-fuel ratio adjusting method comprises the steps that the function information of an engine of a vehicle is obtained according to the type of the vehicle, the function information comprises an oxygen reading command, an air-fuel ratio reading command and an air-fuel ratio setting command; the oxygen reading command issent to the vehicle to obtain the oxygen concentration in engine exhaust gas of the vehicle; when the oxygen concentration is not within the preset range, the air-fuel ratio reading command is sent tothe vehicle to obtain the current air-fuel ratio of the engine; the optimal air-fuel ratio is determined according to the oxygen concentration; and when the current air-fuel ratio is different from the optimal air-fuel ratio, the air-fuel ratio setting command is sent to the vehicle, the air-fuel ratio setting command comprises the optimal air-fuel ratio, and the air-fuel ratio setting command isused for indicating the vehicle to set the air-fuel ratio of the engine to be the optimal air-fuel ratio. By implementing the embodiment of the air-fuel ratio adjusting method and the device, the air-fuel ratios of the engines corresponding to various vehicle systems can be automatically adjusted to reach the optimal air-fuel ratios of the engines, and the applicability of the air-fuel ratio adjusting method is improved.

Description

technical field [0001] The present application relates to the field of vehicle safety, in particular to an air-fuel ratio adjustment method and device. Background technique [0002] The engine of a car provides the driving force for the vehicle to run. When the car starts the engine, the mixture of fuel and air is burned in the cylinder, and the ratio of the intake air volume in the cylinder to the fuel injection volume is called the air-fuel ratio. Exhaust emissions, engine power and economy are closely related. [0003] Generally, the air-fuel ratio of the engine is fixed at the factory. With the long-term use of the engine and the reduction of the combustion efficiency of the mixture, the air-fuel ratio set at the factory is no longer suitable for the vehicle volume, and the air-fuel ratio may be too small. Causes the engine to vibrate, difficult to start, or poor power of the car. The air-fuel ratio is too high to cause overheating of the engine, black smoke, or blockag...

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Problems solved by technology

[0003] Under normal circumstances, the air-fuel ratio of the engine is fixed at the factory. With the long-term use of the engine and the reduction of the combustion efficiency of the mixture, the air-fuel ratio set at the factory is no longer suitable for the vehicle volume, and the air-fuel ratio may be small. Causes the engine to vibrate, difficult to start, or poor power of the car. The air-fuel ratio is too high, which will cause the engine to overheat, emit black smoke or block the air filter, etc.

[0004] At present, if you want to modify the air-fuel ratio of the engine, you need to use the original special equipment to adjust it, and this adjustment cannot be adjusted in real time according to the current engine situation and environment, lack of flexibility, and the corresponding special equipment for each car series The equipment is different, resulting in poor applicability

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