Particulate matter sensor and measurement method thereof

Abstract

The invention relates to the technical field of tail gas emission control of vehicles, and discloses a particulate matter sensor. The particulate matter sensor is provided with a conductive shell, a cylindrical protective piece and a high-voltage electrode which is arranged in the conductive shell and is insulated from the conductive shell, wherein the conductive shell is grounded; the high-voltage electrode is connected with a high-voltage power supply; one end of the conductive shell is connected with one end of the protective piece in a sealed mode; and a tail gas inlet and a tail gas outlet are formed in the protective piece. A measurement method for the particulate matter sensor comprises the following steps of: grounding the conductive shell; applying high voltage onto the high-voltage electrode; allowing gas to be detected to flow through the clearance between the high-voltage electrode and the conductive shell, wherein particulate matters in the gas to be detected are ionized or polarized into conductors through the high-voltage electrode, and other matters in the gas to be detected are not ionized or polarized into the conductors; measuring leakage current, capacitance or resistance values between the high-voltage electrode and the conductive shell; and acquiring the concentration of the particulate matters in the gas to be detected according to a functional relation. The particulate matter sensor and the measurement method thereof are high in measurement accuracy; and the particulate matter sensor has long service life.

Description

technical field [0001] The invention relates to the technical field of vehicle exhaust emission control, in particular to a particle sensor and a measurement method thereof. Background technique [0002] Diesel vehicles in energy saving and CO 2 There are certain advantages in terms of emission reduction. At the same time, the particulate matter emitted by diesel vehicle exhaust has an impact on the human body and the environment. 80% of particulate emissions are below PM2.5, and large particles are formed by agglomeration of small particles. my country is now strengthening the detection of PM2.5 in preparation for the formulation of stricter emission regulations. At present, European and American countries have widely used particle filters (DPF) on diesel vehicles to remove most of the particles in the exhaust gas. Reliable regeneration and failure monitoring of the DPF system requires on-board diagnostics (OBD). [0003] The OBD emission regulations at home and abroad...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is: in order to overcome the shortcomings of low measurement accuracy and short service life of the particle sensor in the prior art, the present invention provides a particle sensor and its measurement method. The particle sensor has good sealing effect and long service life , high-voltage electrode measurement, high measurement accuracy

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