Method for detecting compression loss of cylinders of multi-cylinder combustion engine

A multi-cylinder internal combustion engine, compression loss technology, applied in the direction of internal combustion engine testing, electrical control, mechanical equipment, etc., can solve the problems of measurement convincingness, variation, etc.

Inactive Publication Date: 2019-04-19
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This temperature effect (also known as "warm roar") cannot be measured from the engine temperature or oil temperature and makes the test less convincing

Method used

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  • Method for detecting compression loss of cylinders of multi-cylinder combustion engine
  • Method for detecting compression loss of cylinders of multi-cylinder combustion engine
  • Method for detecting compression loss of cylinders of multi-cylinder combustion engine

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Embodiment Construction

[0038] exist figure 1 An internal combustion engine is shown schematically in FIG. 1 and is designated 100 , which is designed as a four-cylinder four-stroke engine.

[0039] The internal combustion engine 100 has four cylinders 111 , 112 , 113 , 114 which are movably sealed by pistons 121 , 122 , 123 , 124 respectively. The gas forces acting on the pistons 121 , 122 , 123 , 124 are transmitted to the crankshaft 110 .

[0040] Sensor wheel 130 is connected to crankshaft 110 in a rotationally fixed manner. In particular, markings are arranged equidistantly along the circumference of sensor wheel 130 . These marks can be sampled by means of a receiver 132 , eg a magnetic sensor, and a measurement signal 134 , eg a voltage signal, can be determined by a controller 140 .

[0041] From this measurement signal 134 the controller 140 can determine the point in time at which the marking passes the receiver 132 as the so-called tooth time. The segment time can be determined as the ...

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Abstract

The present invention relates to a method for detecting compression loss of cylinders (111, 112, 113, 114) of a multi-cylinder combustion engine (100), wherein in the case of injection deactivation ofthe internal combustion engine (100), each cylinder (111, 112, 113, 114) of the internal combustion engine (100) respectively determines an arc time, in the arc time, the crankshaft (110) of the internal combustion engine (100) surrounds the top dead center of the corresponding cylinder (111, 112, 113, 114) to go through a pre-given angle range, an running unevenness value is determined by the arc time for each cylinder (111, 112, 113, 114), evaluation parameters are determined by employing the running unevenness value for each cylinder (111, 112, 113, 114), and it is evaluated whether theevaluation parameters have compression loss or not. The present invention further relates to a computing unit, a computer program and a machine readable storage medium.

Description

technical field [0001] The invention relates to a method for detecting cylinder compression losses of a multi-cylinder internal combustion engine and to a computing unit and a computer program for carrying out the method. Background technique [0002] For the precise control of combustion in the cylinder of an internal combustion engine, besides the metered fuel quantity, other parameters such as in particular the compression pressure (the pressure in the cylinder interior which can be generated by the piston stroke) are also important. Therefore, disturbances in combustion such as uneven engine running or loss of power may also come from disturbances in compression. [0003] The so-called compression test is a factory diagnostic function which can check for compression deviations on individual cylinders. The compression test records the tooth timing of the crankshaft while the internal combustion engine is being dragged with the injection deactivated. When the teeth are e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M15/06F02D41/00G01M3/26
CPCF02D41/009G01M3/26G01M15/06F02B77/088F02D41/0087F02D41/123F02D41/1498F02D41/22F02D2200/1004F02D2200/101F02D2200/1012
Inventor M·施特格迈尔R·M·齐尔克S·泽科T·梅塔尔
Owner ROBERT BOSCH GMBH
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