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Balancing the excess air ratio between the different combustion chambers of an internal combustion engine by running roughness

A technology of excess air coefficient and combustion chamber, applied in electrical control, mechanical equipment, engine control, etc., can solve the problem of reducing the quality of exhaust gas cleaning

Active Publication Date: 2016-02-17
ROBERT BOSCH GMBH
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  • Abstract
  • Description
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Problems solved by technology

In the driving cycles specified by the different regulations, this equalization must be achieved quickly, since unequal excess air coefficients can reduce the quality of exhaust gas cleaning

Method used

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  • Balancing the excess air ratio between the different combustion chambers of an internal combustion engine by running roughness
  • Balancing the excess air ratio between the different combustion chambers of an internal combustion engine by running roughness
  • Balancing the excess air ratio between the different combustion chambers of an internal combustion engine by running roughness

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no. 1 example

[0031] Reference below figure 2 A first exemplary embodiment of the method aspect of the invention will be described with reference to an application to a five-cylinder internal combustion engine designed as an Otto engine. The method consists of three stages:

[0032] In a first phase, substantially all cylinders of the five-cylinder internal combustion engine are each operated with a first predetermined air-fuel mixture. This first air-fuel mixture has, for example, lambda in equilibrium operation Z =1 excess air ratio, so all cylinders operate with this excess air ratio.

[0033] figure 2 The adjustment (Vertrimmmung) of the excess air ratio in the second phase is shown, in which the individual excess air ratio λ for all cylinders Z1...Z5 In a predetermined manner with the global excess air ratio λ of the internal combustion engine Motor = 1.0 Offset (Amount Adjustment). In this example three cylinders Z 1 ,Z 3 and Z 5 In each case, the operation was performed wi...

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Abstract

The excess air coefficients between the different combustion chambers of the internal combustion engine are balanced by operating irregularities. That is, a method for identifying and / or balancing the difference in the air-fuel ratio unique to the combustion chamber between multiple combustion chambers of an internal combustion engine, especially an Otto engine, by analyzing the unique operating instability characteristics of the combustion chamber to determine the difference, that is, In a first phase the combustion chambers are operated with a predefinable first air-fuel mixture; in a second phase at least two of the combustion chambers are operated with a second air-fuel mixture diluted with respect to the first air-fuel mixture, at least one of which additionally combusts The chamber is operated with a third air-fuel mixture that is enriched relative to the first air-fuel mixture; in the third phase, the rough running characteristics of the combustion chambers operating with the diluted second air-fuel mixture are compared with each other and / or in at least one The diluted second air-fuel mixture in the combustion chamber is changed such that the difference between the diluted second air-fuel mixtures of the plurality of combustion chambers does not exceed a threshold value.

Description

technical field [0001] The invention relates to a method according to the preamble of claim 1 . Furthermore, the invention relates to a controller according to the preamble of claim 7 as well as a computer program according to the preamble of claim 9 and a computer program product according to the preamble of claim 10 . Background technique [0002] These objects are respectively disclosed by the document DE 10 2006 026 390 A1. This document shows an electronic control unit for controlling an internal combustion engine in a motor vehicle, which has an electronic control unit with units for ascertaining the running roughness and for correcting the injection quantity. In order to equalize the excess air ratio, ie the composition of the fuel-air-mixture of the combustion chamber, the device is used to determine cylinder-individual correction values. [0003] Cylinder-specific different excess air ratios can arise due to metering tolerances of the injection valves and cylinder...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/14F02D41/00
CPCF02D41/0085F02D41/1498
Inventor A·科林W·蒂贝尔M·沙伊特A·鲁普陈路
Owner ROBERT BOSCH GMBH
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