Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for operating sensor

A technology for operating sensors and sensors, applied in instruments, scientific instruments, material analysis by electromagnetic means, etc., can solve problems such as failure to reflect exhaust gas composition and exhaust gas extrusion

Active Publication Date: 2015-04-01
ROBERT BOSCH GMBH
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand it must also be ensured that the protective tube which usually surrounds such probes is also very hot and thus assumes the Leidenfrost effect
If these preconditions are not fulfilled, the evaporation of the water droplets will cause the water vapor to push the exhaust gas into the protective tube, which will cause the measurement signal of the probe to not reflect the exhaust gas composition

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for operating sensor
  • Method for operating sensor
  • Method for operating sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0028] The invention is explained below on the basis of a sensor designed as a broadband oxygen sensor. It should be emphasized here that the invention is not restricted thereto, but can also be applied to other probe types, probes or similar devices, in particular also in two-point probes, also known as mutation probes (Sprungsonden) and Among other sensors using ceramic materials.

[0029] In the case of sensors with ceramic or ceramic-like materials, there is a risk of thermal shocks of the type mentioned at the outset, since in ceramic or ceramic-like materials the structures are easily destroyed by the introduced mechanical stresses. Thus, for example, the longitudinal expansion of the material at different temperatures can lead to high mechanical stresses due to local temperature changes, which can lead to fractures or crack formation in the material.

[0030] figure 1 A sensor or gas sensor 100 for determining the concentration of a gas component in a gas mixture is s...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The method involves heating a gas sensor (100) at a target temperature (T2), which is greater than activation temperature and less than a thermal shock temperature, up to a dew point end. Temperature of the sensor is determined and controlled by direct temperature measurement or indirect temperature measurement by measuring internal resistance of the sensor and / or heat flow of the sensor. Monitoring of the temperature sensor is triggered by a start signal that is provided depending upon internal resistance of the sensor that is made of ceramic material. Independent claims are also included for the following: (1) a computer program for performing a method for operating a sensor for determining composition of exhaust gas in an internal combustion engine of a motor vehicle (2) a computer program product with a computer program for performing a method for operating a sensor for determining composition of exhaust gas in an internal combustion engine of a motor vehicle.

Description

technical field [0001] The invention relates to a method for operating a sensor, in particular a sensor made of a ceramic material. Background technique [0002] Sensors or detectors for determining physical features are used in various ways. For example, temperature, soot and gas sensors can be provided in the exhaust line of an internal combustion engine, said sensors enabling an effective purification of the exhaust gas in conjunction with a catalytic converter and a regulating device. [0003] In particular, a stoichiometric air-fuel ratio of λ=1 is set in the exhaust gas by means of a so-called oxygen sensor. Here, λ=1 represents a mass ratio of 14.7 kg of air to 1 kg of fuel. This mass ratio is required for complete combustion of the fuel. Here, λ is the quotient of the supplied air quantity and the theoretical air requirement. [0004] Sensors commonly used as oxygen sensors are based on the principle of an ionized oxygen concentration cell with a solid electrolyt...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/411
CPCG01N27/4067
Inventor S·博费尔特M·法伊A·科林R·哈曼
Owner ROBERT BOSCH GMBH