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Method and device for diagnosing and calibrating faults in high-pressure common rail system

A high-pressure common rail system and fault technology, applied in the direction of measurement device, charging system, fuel injection device, etc., can solve the problems of rough compensation and neglect, and achieve the effect of configuration

Active Publication Date: 2011-09-14
WEICHAI POWER CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although this amount of compensation is a function of time as a variable, this function does not take into account other specific factors associated with the aging and wear of the engine's own actuating parts, so this compensation can only be a rough compensation

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  • Method and device for diagnosing and calibrating faults in high-pressure common rail system

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Embodiment Construction

[0033] Embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The flowchart and block diagrams in the Figures illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present invention. In this regard, each block in a flowchart or block diagram may represent a module, program segment, or portion of code that contains one or more logic devices for implementing the specified Executable instructions for a function. It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or they may sometimes be executed in the reverse order, depending upon the functionality involved. It should also be noted that each block of the ...

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Abstract

The invention relates to a method for diagnosing faults in a high-pressure common rail system of an engine, which comprises the following steps of: breaking at least one cylinder in an engine by adopting a cylinder separation technology; measuring the rail pressure in the high-pressure common rail system after cylinder breakage on the basis of a crankshaft rotating angle; filtering practical rail pressure measured in real time to form input rail pressure; sampling the input rail pressure at a predefined crankshaft rotating angle interval to form a sampling signal; selecting the sampling signal positioned in a rail pressure stable area of the high-pressure common rail system as a characteristic sampling point of rail pressure; filtering the characteristic sampling point to generate rail pressure obtained after cylinder breakage; solving a rail pressure difference value of the rail pressure obtained after cylinder breakage and factory rail pressure; and when the difference value is higher than a preset threshold value, judging that the high-pressure common rail system has a fault. The method also comprises the step of compensating oil spray amount and oil pumping amount which are associated with the rail pressure difference value into the factory oil spray amount and oil pumping amount if the high-pressure common rail system has the fault so as to calibrate the fault.

Description

technical field [0001] Embodiments of the present invention relate to the field of engines, and more particularly, to a method and apparatus for diagnosing and calibrating faults in a high pressure common rail system. Background technique [0002] The high pressure common rail system is an oil supply system for diesel engines. In the closed-loop system composed of high-pressure oil pump, real-time pressure sensor and electronic control unit, the system can completely separate the generation of injection pressure and the injection process from each other. It uses a high-pressure oil pump to deliver high-pressure fuel to the public fuel supply pipe, and uses a real-time pressure sensor to measure the pressure in the public fuel supply pipe to achieve precise control, so that the pressure in the public fuel supply pipe has nothing to do with the engine speed, thereby greatly reducing The degree to which the pressure in the common oil supply pipe of a small diesel engine varies...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M65/00
Inventor 孙少军佟德辉李大明刘兴义桑海浪徐文俊
Owner WEICHAI POWER CO LTD
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