Turbocharged engine control method and system, terminal and readable storage medium

Abstract

The invention provides a turbocharged engine control method and system, a terminal and a readable storage medium. When a turbocharger is suspected to have a serious clamping stagnation fault and the serious clamping stagnation fault can endanger the safety of a turbocharged engine, one or at least two of the following three operations are executed. According to the first operation, the opening degree of a throttle valve of the engine is reduced, then the load in a cylinder of the engine and the maximum combustion explosion pressure are reduced, and the engine can be protected. According to the second operation, the minimum ignition angle of the engine is increased, separate-cylinder fuel cut-off is conducted on the engine, the torque can be increased by increasing the minimum ignition angle of the engine, the torque can be reduced by conducting separate-cylinder fuel cut-off on the engine, and therefore torque balance is achieved, the output torque is kept unchanged, and the turbocharger can be protected. According to the third operation, an intake valve of the engine is closed in advance, the engine enters a Miller cycle, the effective compression ratio can be decreased, knocking or preignition can be avoided, and the engine and the turbocharger can be protected at the same time.

Description

technical field [0001] The present invention relates to the technical field of engines, in particular to a control method, system, terminal and readable storage medium of a turbocharged engine. Background technique [0002] With the development of technology, people have more and more stringent requirements on the performance of automobile engines, not only requiring them to have strong power, but also to have higher efficiency and clean emissions. People's requirements for engine performance require that the engine can achieve a relatively efficient working state under various working conditions. gas requirements. [0003] In order to meet the air intake requirements of the engine, people hope to make the engine air intake "variable" through related designs to meet the air intake requirements under different working conditions, such as the well-known variable valve timing / lift technology, The variable intake manifold technology is developed based on this, and the variable...

AI Technical Summary

Problems solved by technology

As shown in Figure 1, once the impeller of the VGT component is stuck At a small opening (the difference between the actual VGT opening and the VGT target opening is too large), the supercharging pressure rises rapidly and exceeds the target supercharging pressure instantly. At this time, in order to protect the engine, the throttle valve starts to close, and the manifold pressure increases. Controlled but still higher than the target manifold intake pressure, so that the actual intake pressure in the engine cylinder will be higher than expected, and the maximum load exceeds the limit, resulting in damage to the engine due to knocking or pre-ignition due to excessive cylinder pressure; and , in order to keep the torque at the clutch end constant, the ignition angle is delayed to reduce the impact of the increase of the gas path torque. Due to the additional energy brought by the inertia and ignition angle delay to the variable cross-section turbocharger, the boost pressure continues to rise , the variable cross-section turbocharger will also be damaged due to overspeed due to excessive boost pressure

[0006]Currently, it takes a certain amount of time for the overboost diagnosis and stuck diagnosis of the variable geometry turbocharged engine, that is, a certain fault delay is set in order to falsely report the fault. During this period, the engine or turbocharger may be damaged due to load or speed exceeding the limit value.

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