Rail pressure control method under rail pressure sensor failure mode

A rail pressure sensor, failure mode technology, applied in electrical control, engine control, fuel injection control and other directions, can solve the problems of inability to achieve flexible control, emission and power performance deterioration, and achieve the effect of improving power performance and high-precision adjustment

Active Publication Date: 2019-10-29
CHINA FIRST AUTOMOBILE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the conditions used at the working point should be consistent with the set working point, and flexible control of the rail pressure in the failure mode cannot be realized, and the engine will work under inappropriate rail pressure for a period of time during the control process, causing emissions and deterioration of dynamic performance

Method used

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  • Rail pressure control method under rail pressure sensor failure mode
  • Rail pressure control method under rail pressure sensor failure mode
  • Rail pressure control method under rail pressure sensor failure mode

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with specific drawings and embodiments.

[0037] figure 1 A structural diagram of a fuel system implementing the present invention is shown. The fuel delivery pump 5 delivers fuel from the fuel tank 1 to the high-pressure pump 7, and the flow regulating valve 6 controls the fuel flow into the high-pressure pump 7. The fuel is pressurized by the high-pressure pump 7 and stored in the high-pressure rail pipe 10, and the fuel injector 12 passes through the high-pressure fuel pipe. Connect with the high pressure rail pipe 10. The pressure regulating valve 11 reduces the pressure in the high-pressure rail pipe 10 by releasing high-pressure fuel into the oil return pipe 8 , and the return oil in the oil return pipe 8 finally returns to the fuel tank 1 .

[0038] In addition, the system also includes a control unit 2, which controls the flow regulating valve 6, the pressure regulating valve 11 and the fuel ...

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Abstract

The invention provides a rail pressure control method under rail pressure sensor failure modes. Under the linear-drifting failure mode of rail pressure sensors, the rail pressure is controlled by correcting the sensors, and under the nonlinear-drifting failure mode of the rail pressure sensors, the rail pressure is controlled through pressure regulating valves. After the rail pressure control method is applied, when rail pressure sensor failures occur, all-working-condition large-range and high-precision adjustment of common-rail pressure can still be achieved, the performance of an engine is basically approximate to the performance before the failures occur, and the dynamic property, fuel economy and discharging performance of a system under the rail pressure sensor failure modes are improved.

Description

technical field [0001] The invention relates to the field of internal combustion engine control, in particular to a rail pressure control strategy of an electronic pressure limiting valve common rail system. Background technique [0002] The rapid development of electronically controlled common rail technology for diesel engines has greatly improved the power performance and emissions of diesel engines. In order to meet more stringent emission regulations, higher requirements are put forward for the rail pressure control of the high-pressure common rail system, especially the rail pressure control under the failure state of the rail pressure sensor and the fuel inlet metering valve. [0003] At present, mechanical pressure limiting valves are commonly used to realize failure mode rail pressure control and ultra-high pressure safety protection. The principle is to determine the values ​​of structural parameters such as the diameter of the throttle hole and spring stiffness o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/22
CPCF02D41/222F02D2041/223Y02T10/40
Inventor 林涛高先进龚笑舞徐剑飞马二林
Owner CHINA FIRST AUTOMOBILE
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