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Method and measuring device for determining the mass flow rate of fresh air

A mass flow and fresh air technology, applied in the field of computer programs, can solve problems such as increased fuel consumption and increased operating costs, and achieve the effect of improved regulation

Active Publication Date: 2022-03-01
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Throttling unnecessarily increases fuel consumption and thus increases operating costs

Method used

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  • Method and measuring device for determining the mass flow rate of fresh air

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Embodiment Construction

[0021] exist figure 1 A self-igniting internal combustion engine 2 , in the exemplary embodiment a diesel engine of a motor vehicle, is schematically shown in FIG. The self-igniting internal combustion engine 2 usually has a plurality of cylinders, however in which figure 1 Only one cylinder is shown with reference numeral 4 in .

[0022] Combustion chamber 6 of cylinder 4 can be connected to intake manifold 12 via intake valve 8 .

[0023] In this embodiment, the amount of air flowing in the intake duct 12 passes through an air filter 18 that separates particles from the incoming air.

[0024] In the present exemplary embodiment, diesel is injected into cylinder 4 via injector 10 during operation of self-igniting internal combustion engine 2 . The hot combustion exhaust gases then exit the combustion chamber 6 through the exhaust valve 26 into the exhaust pipe 28 . A catalytic converter 30 is arranged in this exhaust pipe.

[0025] The self-igniting internal combustion e...

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Abstract

The invention provides a method for determining the fresh air mass flow for regulating the exhaust gas circulation in the intake tract (12) of a self-igniting internal combustion engine (2), the method having the following steps A pressure sensor ( 22 ) arranged downstream of the flow resistance in the direction of flow (S) acquires a measured pressure drop over the flow resistance and uses the measured pressure drop to determine the fresh air mass flow. A measuring device and a computer program are also subjects of the invention.

Description

technical field [0001] The invention relates to a method, a measuring device and a computer program for determining the fresh air mass flow. Background technique [0002] External exhaust gas recirculation (AGR) is the main measure used to reduce nitrogen oxide (NOx) emissions from diesel engines. However, if too much exhaust gas is reintroduced, soot emissions increase dramatically. [0003] Exhaust gas regulations are increasingly tightened worldwide, so that low tolerance regulation of the exhaust gas recirculation is required over the entire fleet and over the entire life of the vehicle. For this purpose, it is known to use a hot film air flow meter (HFM) for the fresh air supply of the internal combustion engine and thereby measure the intake fresh air quantity. Adjusting this fresh air quantity by opening and closing the exhaust gas recirculation valve allows a targeted reduction of nitrogen oxide emissions without an impermissible increase in soot emissions. [000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D21/08
CPCF02D41/18F02D2200/0402F02D2200/0406F02D2200/703
Inventor R.胡克T.布莱勒
Owner ROBERT BOSCH GMBH