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Soot sensor arrangement

A sensor and sensor circuit technology, applied in measuring devices, exhaust devices, instruments, etc., can solve problems such as high cost, high impedance measurement accuracy, and reduced solder resistance

Active Publication Date: 2021-06-25
DELPHI TECH IP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Additionally, there are currently high impedance measurement accuracy issues caused by flux residues in such circuits
When operating at high ambient temperature (85°C to 125°C), the solder resistance will be greatly reduced, which can lead to >15% measurement error
To remove flux residues, PCBs need to be cleaned with special chemicals and formulations and are very expensive - currently about $3 per board to clean

Method used

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Examples

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Embodiment Construction

[0034] current technology

[0035] figure 1 A known PM sensor and associated circuit (thus showing the interface with the PM controller) are shown. The PM sensor 1 includes a sensor resistor 2 (RSENSOR), typically in parallel with the sensor resistor 2, and this transmits a PM sensor signal (B4) via a sensor to input via unit 7 Microprocessor / controller.

[0036] Conventionally, the PM sensor is pulled up (e.g., 35V) to be used for soot accumulation and resistance measurement via terminal 12. The terminal 12 is thus connected to the VBOOST / SENSOR power supply unit 6, and the VBOOST / SENSOR power supply unit 6 is coupled to the microprocessor 11 for controlling the operation of the sensor 2. Additionally, the terminal 12 is connected to the sensor signal buffer unit 7 to process the signal from the terminal 12 for input (for sensor resistor measurement purposes) to the microprocessor.

[0037] The sensor also includes an RTD resistor 4 (R RTD) that is connected to the microp...

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Abstract

A particulate matter (PM) sensor circuit arrangement including a PM sensor; said sensor including integral therewith: a PM sensor resistor; an RTD resistor and a heater resistor, said PM sensor including four terminal pins, of which: a) a first terminal pin being connected to one terminal of said PM sensor resistor; b) a second terminal pin being connected to one terminal side of said RTD resistor; c) a third terminal pin being connected to one terminal of a heater resistor; d) a fourth common terminal pin being connected to the respective opposite terminals of said PM, RTD and heater resistors to said first, second and third terminal pins; characterized wherein said fourth common pin is operationally connectable or connected to a boost or voltage supply, and wherein said first pin is connected to a low side line.

Description

Technical field [0001] The present invention relates to a particulate matter (PM) sensor typically used in automotive applications to determine the accumulated soot level, and more particularly to its associated circuit. Background technique [0002] PM (Particulate) sensors are typically used in diesel vehicles for measuring PM emissions in the exhaust system (after the diesel particulate filter). Typically, these devices include a sensor resistor, and the soot deposition thereon changes the resistivity of the sensor resistor, so that the cumulative smoke can be determined; the associated circuit is used to measure the resistivity. These soot sensors typically include a heating element / resistor, which can be used to burn into dust in the regenerative cycle. [0003] Therefore, these soot sensors therefore use the "resistivity" method to measure the PM level accumulated on the sensor. Typically, the PM sensor has at least 4 terminals (pin output (PINS OUT). These terminals conn...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/14G01N15/06
CPCG01N15/0656F02D41/1466G01N15/0606G01N2015/0046F01N2560/05F02D41/1494F01N2560/20G01N27/045
Inventor 万建彬
Owner DELPHI TECH IP LTD