Cylinder deactivation gas circuit control method of diesel engine

Abstract

The invention belongs to the technical field of diesel engine electronic control strategy development and particularly provides a cylinder deactivation gas circuit control method of a diesel engine. The cylinder deactivation gas circuit control method of the diesel engine comprises the steps that the current work condition state information of an engine is collected; according to the current work condition state information of the engine, whether the engine is in partial load operation state at present or not is judged; if the engine is in the partial load operation state at present, a cylinder deactivation permission instruction is sent; according to the current work condition state information of the engine, the number of cylinders needing deactivation is calculated, and a cylinder deactivation execution instruction is sent; according to the received cylinder deactivation permission instruction, the cylinder deactivation execution instruction and the number of the cylinders needing deactivation, a corresponding number of air cylinders are sequentially closed. The cylinder deactivation gas circuit control method of the diesel engine can save oil for the whole vehicle and guarantees that the torque is kept balanced before and after cylinder deactivation.

Description

technical field [0001] The invention belongs to the technical field of diesel engine electronic control strategy development, in particular to a diesel engine cylinder deactivation air circuit control method. Background technique [0002] At present, due to the requirements for energy saving and environmental protection of diesel engines and the exhaust temperature requirements of diesel engines, the cylinder deactivation strategy of diesel engines is widely used. [0003] The commonly used implementation methods for diesel engine cylinder deactivation are: fuel cut-off method, valve stop machine, introducing exhaust gas into the cylinder to form internal circulation, and using asymmetric exhaust structure to deactivate cylinders, etc. Among them, the fuel cut-off method is purely electronic. It is easy to implement, but it is restricted by factors such as exhaust temperature management, air-fuel ratio and EGR rate requirements, and fuel-saving effects; the valve stop machin...

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Problems solved by technology

[0003] The commonly used implementation methods for diesel engine cylinder deactivation are: fuel cut-off method, valve stop machine, introducing exhaust gas into the cylinder to form internal circulation, and using asymmetric exhaust structure to deactivate cylinders, etc. Among them, the fuel cut-off method is purely electronic. It is easy to implement, but it is restricted by factors such as exhaust temperature management, air-fuel ratio and EGR rate requirements, and fuel-saving effects; the valve stop machine shuts off the cylinder valves that are not working and cuts off fuel at the same time. In recent years, many companies have introduced related valve control systems. , the fuel-saving effect is good, the throttling loss is reduced, and the exhaust temperature will not decrease after the engine cylinder is stopped, but the structure is relatively complicated

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