Control method and control system for maximum fuel regulation capacity of engine

Abstract

The invention discloses a control method for fuel regulation maximum capacity of an engine. The method comprises the following steps of obtaining a first fuel regulation maximum permissible range under fuel characteristics, environment working conditions and engine steady-state working conditions; obtaining a second fuel oil adjustment maximum allowable range under the transient working condition; obtaining a third fuel oil regulation maximum allowable range under the transition working condition of the catalytic converter front linear oxygen sensor from non-activation to activation; taking the minimum value of the maximum fuel oil adjustment coefficient of the maximum permissible range of fuel oil adjustment as the final maximum fuel oil adjustment coefficient, and taking the maximum value of the minimum fuel oil adjustment coefficient of the maximum permissible range of fuel oil adjustment as the final minimum fuel oil adjustment coefficient. The invention further provides a system for controlling the maximum fuel regulation capacity of the engine. According to the method, the combustion stability, fuel economy and emission of the engine are comprehensively considered, the fuel adjusting range of the engine is controlled in real time, and therefore the engine has good emission performance.

Description

technical field [0001] The invention belongs to the field of engine control, and in particular relates to a method and a control system for controlling the maximum capacity of engine fuel regulation. Background technique [0002] As people pay more attention to the environment, my country's regulations on vehicle exhaust emissions are becoming increasingly stringent. The engine air-fuel ratio has a crucial impact on emissions, and the size of the fuel adjustment function has a significant relationship with the engine air-fuel ratio. In the engine electronic control system, the fuel adjustment function is very important. It controls the actual air-fuel ratio near the target air-fuel ratio through real-time correction of the fuel injection (quantity), so that the engine combustion efficiency and emission treatment capacity can reach the highest. Due to the difference in vehicle manufacturing and the aging of the fuel injector, there is a large deviation in the fuel injection ...

AI Technical Summary

Problems solved by technology

However, too much or too little fuel regulation can have adverse consequences such as engine speed fluctuations, possible increased fuel consumption, and worsened emissions

[0003] The publication number is CN105370421A, and the patent name is the fuel correction diagnosis method and system. The patent only distinguishes the fuel adjustment limits under idling and non-idling conditions, and does not adjust according to the working conditions. The fuel adjustment range of the engine obtained is not accurate. , there is a defect of low control precision

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