Cylinder shutting down mode implementing method and system of engine, and vehicle

Abstract

The invention provides a cylinder shutting down mode implementing method and system for an engine, and a vehicle. The method includes: selecting a plurality of engine rotation speeds, and performing load characteristic test in a plurality of preset cylinder shutting down modes at each engine rotation speed so as to acquire a plurality of groups of training samples; training a wavelet neural network according to the training samples; inputting running parameters of a vehicle into the trained wavelet neural network so as to determine the cylinder shutting down number and a cylinder shutting down sequence when it is determined that the vehicle enters a cylinder shutting down mode, generating a corresponding cylinder shutting down mode signal, and acquiring the air intake flow and the fuel injection amount of working cylinders according to the cylinder shutting down mode signal; and controlling a cylinder shutting down process of the engine according to the cylinder shutting down mode signal, and the air intake flow and the fuel injection amount of the working cylinders. The cylinder shutting down mode implementing method of the engine can ensure a cylinder shutting down effect (i.e., fuel economy, can improve the uniformity of the cylinders and the stability of working, can improve the reliability of the whole vehicle, and can improve the comfort of a driver.

Description

technical field [0001] The invention relates to the technical field of automobiles, in particular to a method, system and vehicle for realizing a cylinder cut-off mode of an engine. Background technique [0002] The engine works in the range of surface working conditions, its speed and load range are very wide, and the fuel economy is poor at low load rates. As the fuel consumption regulations become more stringent, the demand for reducing fuel consumption is increasing for engines with multiple cylinders and large displacement. Urgent. Cylinder cut-off technology can close one or several cylinders when the engine is partially loaded. In order to ensure that the engine power remains unchanged, it is necessary to increase the load rate of the working cylinders, thereby improving the mechanical efficiency of the engine, reducing pumping losses, and improving fuel economy. [0003] The key of cylinder cut-off control is when to cut off cylinders, which cylinders to close, the ...

AI Technical Summary

Problems solved by technology

[0004] The common implementation method of the existing cylinder cut-off mode is to stop the work of some specific cylinders under the condition of partial load of the engine, and it is impossible to accurately adjust the cut-off time of the cylinder and the selection of the working cylinder and the stop cylinder according to the change of the working condition, thereby affecting the economy of the cut-off cylinder In addition, the working cylinder and the stop cylinder are usually fixed, which is easy to cause unevenness of work between cylinders and affect the reliability of the whole machine

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