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Method and device for detecting auto-ignitions in a spark ignition internal combustion engine

An internal combustion engine, spontaneous technology, applied in the direction of measuring devices, internal combustion piston engines, combustion engines, etc., capable of solving problems such as destruction, piston damage, melting of parts, etc.

Active Publication Date: 2017-08-01
VTESCO TECH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The high thermal load of the combustion chamber can lead to damage or even complete destruction of the piston, or to the melting of the electrodes of the spark plug or (in any case) the components of the highly loaded outlet valve

Method used

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  • Method and device for detecting auto-ignitions in a spark ignition internal combustion engine
  • Method and device for detecting auto-ignitions in a spark ignition internal combustion engine
  • Method and device for detecting auto-ignitions in a spark ignition internal combustion engine

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Embodiment Construction

[0027] Internal combustion engine BKM ( figure 1 ) includes: intake port 1, engine block 2, cylinder head 3 and exhaust port 4. The intake duct 1 preferably comprises a throttle valve 11 and further comprises an intake duct 13 which leads via an inlet duct to the cylinder Zyl(x) and into the engine block 2 . The engine block 2 comprises a crankshaft 21 coupled via a connecting rod 25 to a piston 24 of a cylinder Zyl(x). Cylinder Zyl(x) and piston 24 delimit a combustion chamber 27 . exist figure 1 In , only a single cylinder Zyl(x) is shown for the sake of clarity, whereas the internal combustion engine BKM has at least 2 cylinders, preferably 3, 4, 5, 6 or 8 cylinders.

[0028] The cylinder head 3 comprises a valve drive with an inlet valve 30 , an outlet valve 31 and a corresponding valve drive (not shown in detail). The cylinder head 3 further includes a spark plug 35 and an injection valve 34 . Alternatively, as in figure 1 The injection valve 34 can also be arranged...

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Abstract

In a spark ignition internal combustion engine having a plurality of cylinders (Zyl (x)), successive segment time periods which are assigned to the individual cylinders(Zyl (x)) and which the crankshaft requires during the working strokes of the cylinders (Zyl (x)) in order to run through predefined angle ranges are measured, and subsequently irregular running values (LU_Zyl (x)) are determined from the segment time periods. In a predefined load / rotational speed range of the internal combustion engine, the irregular running values (LU_Zyl (x)) of all the cylinders (Zyl (x)) are compared with a predefined threshold value (LU_Zyl_SW), and suspected auto-ignition for a cylinder (Zyl (x)) is detected if the irregular running value (LU_Zyl (x-1)) of a cylinder (Zyl (x-1)) located before the cylinder (Zyl (x)) in terms of the timing of the ignition sequence undershoots the threshold value (LU_Zyl_SW). The supply of fuel to the cylinder (Zyl (x)) suspected of having auto-ignition is interrupted for a predefined number of cycles (z), and the influence of the interruption of fuel into the cylinder (Zyl (x)) on the irregular running values (LU_Zyl (x-1)) of the cylinder (Zyl (x-1)) during the cycles (z) is detected. The suspected auto-ignition of the cylinder (Zyl (x)) is either confirmed or rejected as a function of the irregular running values (LU_Zyl (x-1)) occurring at the cylinder (Zyl (x-1)).

Description

technical field [0001] The invention relates to a method and a device for detecting spontaneous ignition in an internal combustion engine with applied ignition. Background technique [0002] In modern highly charged Otto-cycle internal combustion engines (Otto-Brennkraftmaschinen), premature ignition and spontaneous ignition are increasingly common with increasing charge and peak pressure. These phenomena mainly occur at high loads over the entire engine speed range and are distinguished by uncontrolled spontaneous ignition of the fuel-air mixture in the combustion chamber immediately before spark ignition by means of a spark plug. The result is uncontrolled ignition and combustion with extremely high peak pressures, very high combustion temperatures, high pressure amplitudes and consequently destructive effects. [0003] However, premature ignition usually occurs as a random independent event due to hot residual particles remaining in the combustion chamber and disappears ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/14F02D35/02
CPCF02D35/02F02D41/0087F02D41/1498G01L23/225F02B37/183Y02T10/12F02D9/10F02D41/22F02D41/26F02D41/3005F02D2200/021
Inventor A.加尔胡贝尔D.比尔M.基贝格尔
Owner VTESCO TECH GMBH