Common rail pressure control method

A control method and technology of common rail pressure, applied in electrical control, engine control, fuel injection control, etc., can solve problems such as inability to eliminate hazards, dynamic control performance cannot be well satisfied, etc., and achieve the effect of eliminating the deterioration of dynamic performance

Active Publication Date: 2016-08-24
CHINA FAW LIMITED WUXI FUEL INJECTIONEQUIP RES INST +1
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  • Abstract
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Problems solved by technology

The disadvantage is that although this method alleviates the phenomenon of integral saturation, it cannot eliminate the harm caused by this phenomenon, and its dynamic control performance cannot be well satisfied when the vehicle operating conditions change and switch significantly.

Method used

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Embodiment Construction

[0048] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0049] figure 1 It is a schematic diagram of the high pressure common rail fuel system structure. In the figure, the fuel is sucked from the fuel tank 1 with the primary filter to the fine fuel filter 2, and part of the fuel is pressurized in the plunger chamber of the high-pressure fuel pump 3 to form high-pressure fuel, which flows from the outlet valve port of the fuel pump through the high-pressure fuel pipe and collects into the common rail. The pipe 5 provides a stable and continuous high-pressure fuel source for the high-pressure injection of the fuel injector 7, and the excess part flows back to the fuel tank 1 from the overflow valve on the fuel pump together with the oil returned from the fuel injector 7; the high-pressure fuel flows from the common rail pipe 5 through The high-pressure fuel pipe flows to the fuel injector 7 of each cylinder respecti...

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Abstract

The invention provides a common rail pressure control method, and particularly provides a novel common rail pressure control method of a fuel system, which aims at overcoming the defects of the existing common rail pressure control technique of the electrically-controlled diesel fuel system. The common rail pressure control method has the advantages that a fuzzy adaptive PID (proportion integration differentiation) control method is used to replace the common PID control method, so as to meet the requirement of control dynamic property of rail pressure under the complicated working condition; the change of the gain of PID can be uniformly arranged and jointly assessed according to the judgment of engine working conditions and common rail pressure change phase, so as to realize the high-precision rail pressure control effect; meanwhile, a common rail pressure PID integral separation method is used for fundamentally solving the integral windup, and eliminating the deterioration of common rail pressure control dynamic property caused by the integral windup.

Description

technical field [0001] The invention relates to a control method in an internal combustion engine, in particular to a control method for common rail pressure used in a fuel injection system of an internal combustion engine. Background technique [0002] With the increasingly severe energy crisis and continuous improvement of emission regulations, electronically controlled common rail technology has become an inevitable trend in the diesel engine industry, and its successful development is a revolutionary breakthrough in the automotive industry. Compared with the conventional diesel electronically controlled injection system, the two basic tasks of the common rail fuel system, pressure generation and fuel supply metering, are separated in time, position and function, and the pressure generation and fuel supply volume are basically realized with the fuel injection. The process is irrelevant, so that the fuel system has greater flexibility, and the fuel injection volume and fue...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/38
Inventor 顾欣施华传冯源龚笑舞高先进胡川王伏
Owner CHINA FAW LIMITED WUXI FUEL INJECTIONEQUIP RES INST
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