A method for operating a conveying and proportioning system

A technology of conveying pump and metering unit, which is applied in the field of computer programs and computer program products with program codes, and can solve the problems of limiting system working efficiency, uneven medium, inaccurate input parameters, etc.

Inactive Publication Date: 2014-02-12
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Thus, for example, uneven and / or partially incomplete thawing of the medium can occur, so that inaccuracies can arise during dosing
Furthermore due to the occurrence of gas or vapor inclusions in the defrosting process pump system, said inclusions affect the functionality of said system
In addition, non-uniform heating within the delivery and dosing system leads to inaccuracies of the various input variables for the temperature model and pressure model and thus makes them unavailable or only limitedly usable for other system controls.
Incorrect model calculations can lead to erroneous system responses and in some cases can significantly limit system productivity

Method used

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  • A method for operating a conveying and proportioning system
  • A method for operating a conveying and proportioning system
  • A method for operating a conveying and proportioning system

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Embodiment Construction

[0025] exist figure 1 The delivery and metering system for the reducing agent of the SCR catalyst system shown in , serves as an exemplary system suitable for carrying out the method according to the invention. The invention is not limited to this system. Rather, the flushing method according to the invention can also be used in other delivery and metering systems with a separate return path. For example, pump systems with return lines with distribution valves instead of return pumps are also suitable. figure 1 The pump system of the conveying and dosing system in includes a conveying module 1 and a return module 2 . The delivery module 1 here comprises a basic delivery pump 10 which is designed as a reciprocating piston pump 10 with a reciprocating magnet 11 , a spring 12 , a diaphragm 13 and a reciprocating piston 14 . Furthermore, a suction valve 15 and a discharge valve 16 are located in the delivery module 1 . The return pump 20 in the return module 2 is basically des...

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Abstract

In a method for operating a conveying and proportioning system, the system for conveying a liquid medium from a tank (3) and proportioning the medium via a pressure line (4) by means of at least one proportioning unit (7) is provided. The system comprises at least one feed pump (10) and at least one device for returning the medium, in particular a return pump (20) and / or a distribution valve for a return line. Furthermore, at least one heating device for heating the system is provided. The method is distinguished by the fact that after and / or during a heating of the system by at least one heating device, especially after thawing the medium in the conveying and proportioning system, a purge within the conveying and proportioning system is performed, by the means of conveying the medium from the tank (3) through activation of the feed pump (10) when the proportioning unit (7) is closed and activating the device (20) for returning the medium.

Description

technical field [0001] The invention relates to a method for operating a conveying and metering system which is provided for conveying a fluid medium from a storage tank and metering the medium by means of at least one metering unit via a pressure line. The system comprises a delivery path with at least one delivery pump and a return path with at least one device for returning the medium. In addition, at least one device for heating the delivery and metering system is provided. Furthermore, the invention relates to a computer program and a computer program product with program code, which are suitable for carrying out the method. Background technique [0002] A method and a device are disclosed, in particular in a motor vehicle, for operating an internal combustion engine, in the exhaust region of which an SCR (Selective Catalytic Reduction) catalyst is arranged, which reduces the nitrogen oxides contained in the exhaust gas of the internal combustion engine (NO X ) inter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/10F04B49/00
CPCF01N3/208F01N2610/105F01N3/10F04B49/00F01N2610/1493F01N2610/02F04B23/02F04B13/00F04B49/02F04B53/08Y02T10/24F01N3/2066F01N2610/1473F01N2610/144Y02T10/12
Inventor J.布劳恩T.J.C.C.苏亚雷斯
Owner ROBERT BOSCH GMBH
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