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Arrangement for detecting the cylinder assignment of an internal combustion engine

A cylinder and branch technology, applied in the field of circuit analysis, can solve problems such as difficulties and influences, and achieve high robustness

Inactive Publication Date: 2011-06-15
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] However, it is difficult and partly impossible to implement the cylinder assignment by means of the derived signal with the known method, such as that described in DE 40 28 545 A1, since the decoupled secondary signal is also affected by the ignition coil The effect of the primary circuit

Method used

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  • Arrangement for detecting the cylinder assignment of an internal combustion engine
  • Arrangement for detecting the cylinder assignment of an internal combustion engine
  • Arrangement for detecting the cylinder assignment of an internal combustion engine

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Embodiment Construction

[0021] Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] figure 1 The secondary voltage profiles of the two spark plugs 16 and 17 are shown on the left, the first spark plug 16 in the uncompressed cylinder and the second spark plug 17 in the compressed cylinder. The upper curve A corresponds to the secondary voltage at the first spark plug 16 and the lower curve B corresponds to the secondary voltage at the second spark plug 17 . It is clear that both voltages (ideally) rise symmetrically with respect to the neutral line when developing the ignition voltage of the two spark plugs, until a breakdown occurs on one of the two spark plugs, which means at the uncompressed The first spark plug 16 on the cylinder, and the voltage there has a constant level of about 1 kV, ie the separation voltage.

[0023] This results in a potential jump of the secondary winding 1 which leads to a balancing proces...

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Abstract

The invention relates to an evaluation circuit for detecting the cylinder assignment of an internal combustion engine using a signal which is capacitively output at the ignition coil (1) with respect to a particular first potential for cylinder assignment, having a peak value stage which is preferably low-pass-limited, receives the signal capacitively output at the ignition coil with respect to the particular first potential or a first evaluation signal (A1') derived therefrom, stores a positive peak value of the received signal in order to generate a second evaluation signal (INT_ PK_ POS) and stores a negative peak value of the received signal in order to generate a third evaluation signal (INT_ PK_ NEG).

Description

technical field [0001] The invention relates to an evaluation circuit for checking the cylinder distribution of an internal combustion engine according to the preamble of claim 1 . Background technique [0002] The state of the art for signal analysis of ignition coils, in particular 2×2 ignition coils, is the implementation of various capacitive interception concepts at such double spark coils. In the case of a double spark coil, the two ends of the secondary winding are each connected to a spark plug. After disconnection of the charging current on the primary side, the voltage at the two spark plugs rises almost symmetrically with respect to the neutral line, one voltage rises towards a positive voltage and the other towards a negative voltage. The spark plug located in the cylinder in the exhaust stroke has a lower breakdown voltage than the other spark plug in the compression stroke due to the lower combustion chamber pressure. If only the first spark plug breaks down,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02P15/08
CPCF02D2041/0092F02P15/08F02D41/009F02P17/00F02P2017/006F02D2250/14
Inventor G・马莱布赖因L・普特曼J・赖特H・科利
Owner ROBERT BOSCH GMBH
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