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Method for operating an internal combustion engine and internal combustion engine

A technology for internal combustion engines and three-way catalytic converters, applied to internal combustion piston engines, combustion engines, machines/engines, etc., can solve problems such as high HC emissions and CO emissions, inaccurate processing methods, and large lambda shifts

Active Publication Date: 2022-03-01
VITESCO TECH GERMANY GMBH
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  • Description
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Problems solved by technology

However, when the binary voltage is higher, the voltage change can cause a larger λ shift, and the accuracy of the λ value downstream of the three-way catalytic converter can no longer be ensured by the binary voltage value of the detector
This can lead to a higher shift in lambda towards the rich direction, which causes higher HC and CO emissions
Therefore, the known treatment has inaccuracies

Method used

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  • Method for operating an internal combustion engine and internal combustion engine

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Embodiment Construction

[0022] In the rich range of the lambda signal a threshold value of the lambda signal of 750 mV is given. If this threshold value is undershot, ie if 750 mV is undershot, the target value for lambda upstream of the catalytic converter is determined from the difference between the target value of this binary signal and the measured binary signal. If above this threshold of 750mV, pass the NO X Sensor NH 3 Target value and NO X The sensor's measured NH 3 The difference between the signals determines the lambda target value before the catalytic converter, the NH 3 The target value here is 10 ppm. If the measured NH 3 concentration higher than NH 3 Target value, then increase the λ target value before the three-way catalytic converter towards the lean direction. If said concentration is lower than NH 3 target value, then decrease the λ target value toward the rich direction.

[0023] Therefore, by NO X The combined measurement of the lambda value and the NH value by the s...

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Abstract

The invention relates to a method for operating an internal combustion engine and to an internal combustion engine. A three-way catalytic converter with lambda regulation is located in the exhaust gas line of the internal combustion engine, NO with integrated lambda detector X A sensor is arranged downstream of the three-way catalytic converter. by NO with an integrated lambda detector downstream of the three-way catalytic converter X sensor for lambda and NH 3 Combined measurement of the value to determine the lambda target value upstream of the three-way catalytic converter. In this way, the emission behavior of the three-way catalytic converter can be monitored and controlled particularly accurately.

Description

technical field [0001] The invention relates to a method for operating an internal combustion engine, the exhaust gas line of which is arranged with a three-way catalytic converter with lambda control. Background technique [0002] With regard to the emissions of internal combustion engines, increasingly stringent requirements are imposed. This also involves the use of regulated three-way catalytic converters, by means of which the CO and C m h n Oxidation and NO X restoration. The prerequisite for this is a constant stoichiometric fuel ratio (λ=1). Therefore, such a three-way catalytic converter is only used in vehicles with gasoline engines and lambda regulation. [0003] In this case, in addition to a lambda probe upstream of the three-way catalytic converter for lambda regulation, a lambda probe is also used downstream of the three-way catalytic converter in order to monitor the mode of operation of the catalytic converter. Therefore, in order to make NO X Emissio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N3/08F02D41/14F02D41/24
CPCF01N3/0842F02D41/1441F02D41/1454F02D41/146F02D41/1463F02D41/2474F01N2560/026F02D2041/1468F02D2250/36F01N3/101F01N2430/06F01N2560/021F01N2560/025Y02T10/12F01N2550/02
Inventor 张宏
Owner VITESCO TECH GERMANY GMBH
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