Ignition control system and method based on engine fuel-air ratio request

Abstract

The invention discloses an ignition control system based on an engine fuel-air ratio request. An engine combustion condition recognition module judges whether an engine meets the conditions that the difference between the actual rotating speed and the target rotating speed exceeds the preset engine rotating speed and the gas path torque in idle speed closed-loop control is lower than the preset torque or not; the engine combustion condition recognition module judges whether the engine is in a fuel-air ratio control state based on a catalyst request or not; the engine combustion condition recognition module judges whether the engine is in an ignition efficiency control state based on the catalyst request or not; and when the engine activates idle speed closed-loop control and the engine is in the fuel-to-air ratio control state based on the catalyst request, and meanwhile the engine is not in the ignition efficiency control state based on the catalyst request, an ignition angle control module performs ignition angle adjustment control. Ignition control conducted through the method can meet the economical efficiency and stability of engine combustion at the same time.

Description

technical field [0001] The invention relates to the technical field of engine control, in particular to an ignition control system and method based on engine fuel-air ratio request. Background technique [0002] As the performance requirements of the engine are getting higher and higher, not only the power, economy, and emissions must be considered, but also the drivability and ride comfort of the vehicle must be considered. This is a process of weighing and arbitrating. For the purposes of diagnosing the degradation of the catalytic converter and improving emissions, the oxygen clearing and storage in the catalytic converter will be controlled, and the fuel-air ratio will be actively controlled during the ignition process of the catalytic converter. At this time, the engine combustion is not in the best fuel-air condition. It will cause the combustion stability of the engine to deteriorate, which will affect the fluctuation of the engine speed, especially in the idling cond...

AI Technical Summary

Problems solved by technology

However, under the condition of unstable engine combustion, even if the engine ignition angle is optimal, it cannot continue to pre-ignition to improve engine combustion stability, and if the ignition angle is adjusted through engine torque adjustment at this time, it may cause system control. Hysteresis, still causing engine jitter

[0005] In other words, the above-mentioned Chinese patent application only considers the combustion economy of the engine, but does not take into account the stability of the engine combustion

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