Method and device for operating delivery pump

A technology of conveying pump and electric conveying, applied in the direction of muffler device, exhaust device, electric control of exhaust gas treatment device, etc., can solve the problem of difficult evaluation of current signal, and achieve the effect of minimizing noise

Active Publication Date: 2018-12-11
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] For such mode of operation also known as acoustic function or NVH ( N oise- V ibration- H arshness, that is to say the avoidance of noise, vibrations and jerky running), it is problematic that the

Method used

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  • Method and device for operating delivery pump
  • Method and device for operating delivery pump
  • Method and device for operating delivery pump

Examples

Experimental program
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Example Embodiment

[0041] figure 1 The technical environment is shown as an example, in which the method according to the invention can be used. Here, the illustrations are limited to components necessary for explaining the present invention.

[0042] in figure 1 Exemplarily shows an internal combustion engine 1 configured as a diesel motor, which includes a motor cylinder 10 and an exhaust passage 30 in which an exhaust gas flow 20 is guided. The exhaust duct 30 has an exhaust gas purification device, which in the illustrated embodiment as a catalytically coated component, when arranged along the flow direction of the exhaust gas, first has an SCR catalyst 40 and Diesel Particulate Filter 50 (DPF). Before the SCR catalyst 40, an injection unit 70 is arranged on the exhaust passage 30, and the urea-water solution can be injected by the injection unit. The injection unit 70 and the metering unit 80 belong to a metering system 60 which can be controlled by the control unit 91. The functions of t...

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PUM

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Abstract

The invention relates to a method and a device, in particular a control unit, for operating an electric delivery pump designed as a reciprocating diaphragm pump or a reciprocating piston pump, whereinin order to carry out a transport stroke by partial control within a total period duration, during a control period, a solenoid coil of the delivery pump is loaded with control voltage over such a long pulse duration, so that armature impact of the delivery pump is effected in time interval after a control phase, and the moment of the armature impact is determined through evaluation of a currentcharacteristic curve of coil current flowing through the solenoid coil, wherein the duration of the time interval is predetermined and the end of the pulse duration is selected in such a way, so as tocomply with the time interval. As a result, a control scheme of the delivery pump is optimized in terms of delivery power and/or noise generation, the control scheme being used to avoid noise, vibration and unsteady operation.

Description

technical field [0001] The invention relates to a method for operating an electric delivery pump configured as a reciprocating diaphragm pump or as a reciprocating piston pump, wherein in order to carry out a delivery stroke by partial actuation within the total cycle duration, during the actuation phase, The solenoid coil of the delivery pump is supplied with an actuation voltage in the range of such a long pulse duration that in the time interval (Δt) after the actuation phase, the armature strike of the delivery pump takes place, and by The moment at which the armature strikes is determined by evaluating the current characteristic curve of the coil current flowing through the solenoid coil. [0002] Furthermore, the invention relates to a device, in particular a control unit, for carrying out the method according to the invention. Background technique [0003] In order to comply with current exhaust gas legislation, for example, the nitrogen oxide-reducing urea-water sol...

Claims

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Application Information

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IPC IPC(8): F04B49/06F01N3/20F01N9/00
CPCF01N3/2066F01N3/208F04B49/06F01N2610/144F01N2610/02H01F7/18F04B13/00F04B17/04Y02T10/12F01N3/10F01N9/00
Inventor R.约希C.拜尔J.马克坦德
Owner ROBERT BOSCH GMBH
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