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Accidental control policy of multi-cylinder engine part air cylinder stopping

A multi-cylinder engine, random control technology, applied in the direction of engine control, machine/engine, mechanical equipment, etc., can solve the problems of the application range of cylinder deactivation technology and the limitation of fuel saving effect, achieve a wide range of applications, expand the scope of application, reduce cost effect

Inactive Publication Date: 2009-04-15
SAIC MOTOR
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  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

In this way, the application range and fuel saving effect of cylinder deactivation technology are limited.

Method used

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  • Accidental control policy of multi-cylinder engine part air cylinder stopping
  • Accidental control policy of multi-cylinder engine part air cylinder stopping

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Embodiment Construction

[0023] The present invention adopts the control strategy of randomly selecting cylinders to reduce the system vibration caused by cylinder deactivation, thus expanding the scope of applying cylinder deactivation technology from engines with 6 cylinders and above to 4-cylinder engines or even 3-cylinder engines. The number of deactivated cylinders, so that the number of working cylinders can even be reduced to 1 cylinder. This not only increases the types of engines that can apply cylinder deactivation technology, but also increases the fuel saving effect because the number of deactivated cylinders is no longer limited.

[0024] The specific way of the present invention is: under partial load working condition, in order to avoid the work of cylinder under low load, one or several cylinders are randomly determined as working cylinders by the control system, and the other cylinders are deactivated (i.e. cut off fuel supply and Stop the intake and exhaust), and use the resonance p...

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Abstract

The invention discloses a random control strategy of cylinder deactivation of part of cylinders of a multi-cylinder engine. One or a plurality of cylinders are selected as working cylinders under the working condition of partial load; the combination of the cylinder as the working cylinder is randomly determined by a control system which carries out monitoring to the vibration condition of the engine and a chassis and randomly determines another different cylinder combination as the working cylinder before the engine and the chassis of an automobile occur resonance. As the cylinder deactivation of the cylinders is irregular in different working cycle, the fluctuation of an output torque is aperiodic and can not excite periodic forced vibration of the system, therefore, the amplitude of vibration of the system is controlled, the number of the cylinder deactivation can be increased and is not limited by the number of the cylinder, even only one cylinder works, thus expanding the application range of the technology of cylinder deactivation and having more obvious oil-saving effect. The control strategy can be realized by a software method under the condition that the cut off of air and oil of each cylinder can be independently carried out.

Description

technical field [0001] The invention relates to a control strategy for an engine, in particular to a control strategy for deactivating some cylinders of a multi-cylinder engine. Background technique [0002] In the part-load condition of the engine, the specific fuel consumption of the engine, that is, the fuel consumption per unit power output, increases as the load decreases. Gasoline engines need to throttle the air intake after the load is reduced to reduce the intake pressure and flow, resulting in engine pumping loss. [0003] After adopting the deactivation technology of partial cylinders under partial load conditions, the load of cylinders that are not deactivated increases, which prevents the cylinders from working under low loads and improves the efficiency of the whole machine. In recent years, more and more cars have adopted cylinder deactivation technology. [0004] Several fulcrums are needed for the installation and fixing of the engine, and the car engine i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D29/02F02D17/00F02D13/02
Inventor 苏万华章健勇武涛杨嘉林
Owner SAIC MOTOR
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