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Apparatus and method for operating a particle sensor

A particle sensor and equipment technology, applied in mechanical equipment, particle suspension analysis, instruments, etc.

Active Publication Date: 2022-07-08
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This improves measurement accuracy

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  • Apparatus and method for operating a particle sensor
  • Apparatus and method for operating a particle sensor
  • Apparatus and method for operating a particle sensor

Examples

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Embodiment Construction

[0022] figure 1 A device 100 for operating a particle sensor is shown schematically. The particle sensor is, for example, one of the mentioned particle sensors which operates according to the electrostatic measuring principle, which enables the real-time measurement of the particle concentration or particle mass in the exhaust gas flow by measuring the charging current.

[0023] The particle sensor includes at least one high voltage electrode 102 and at least one ground electrode 104 . An electric field E may be generated between at least one high voltage electrode 102 and at least one ground electrode 104 . At least one ground electrode 104 is grounded. Ground means, for example, the ground potential of an internal combustion engine that generates an exhaust gas flow or the ground potential of a motor vehicle with an internal combustion engine that generates an exhaust gas flow. The potential of at least one ground electrode 104 may also be higher than the ground potential...

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Abstract

A device (100) for operating a particle sensor comprising at least one high voltage electrode (102) and at least one ground electrode (104), wherein the device (100) has a processor (106), A measuring device (108) and a voltage supply unit (110), wherein an electric field (E) can be generated between the at least one high-voltage electrode (102) and the at least one ground electrode (104), the measuring device (108) 108) configured to measure a charge balance current (I) in the electric field (I) of the exhaust gas flow at least partially between the at least one high voltage electrode (102) and the at least one ground electrode (104). flow to the at least one high voltage electrode (102) and / or the at least one ground electrode (104) during the flow in the region of E); the processor (106) is configured to control the voltage supply unit (110) ) so as to pass the alternating voltage (U) between the at least one high voltage electrode (102) and the at least one ground electrode (104) for at least one time period during the measurement of the charge balancing current (I) to generate the electric field (E).

Description

technical field [0001] The present invention relates to an apparatus and a method for operating a particle sensor, in particular an electrostatic particle sensor. Background technique [0002] Particle sensors are used for the determination of the soot mass in exhaust pipes of internal combustion engines of motor vehicles, for example in order to monitor diesel particulate filters. Known particle sensors work according to the electrostatic measurement principle, which enables real-time measurement of particle concentration or particle mass by measuring the charging current. Such schemes are described in WO 2012089924 A1, US 20120312074 A1, US 20130219990 A1. These particle sensors include at least one high voltage electrode and at least one ground electrode. High voltage electrodes typically operate with a direct current high voltage, ie, a DC high voltage, which is at a high potential in the range of several thousand volts (kV). The ground electrode is grounded. An elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/06F02D41/14
CPCG01N2015/0046F02D41/1466G01N15/0656F01N2560/05F02D2041/281
Inventor S·延特F·罗尔夫林D·克雷布斯R·鲁萨诺夫I·黑伦A·蒂芬巴赫N·博德H·席滕黑尔姆
Owner ROBERT BOSCH GMBH