A particle sensor and its manufacturing method

Abstract

The invention belongs to the technical field related to exhaust gas purification, and discloses a particle sensor and a manufacturing method thereof. The particle sensor includes a connected body structure and a reference circuit; The test capacitance and the pair capacitance, the test capacitance, the pair capacitance and the reference circuit form a bridge circuit; wherein, the ratio of the test capacitance to the pair capacitance is 0.1-10. The present invention changes the working mode in real time by adding pair capacitance and a reference circuit, offsets the voltage phase difference between the test circuit and the reference circuit during the test process, and amplifies the output signal of the difference voltage to achieve the particle concentration in the environment to be tested for real-time detection purposes.

Description

technical field [0001] The invention belongs to the technical field related to exhaust gas purification, and more specifically relates to a particle sensor and a manufacturing method thereof. Background technique [0002] As the number of motor vehicles increases year by year, the problem of environmental pollution caused by exhaust emissions has become increasingly serious, and the laws and regulations restricting exhaust emissions of motor vehicles have become more and more stringent. The main components of motor vehicle exhaust are particulate matter (PM), NO X , HC, CO, etc. Particles account for most of the exhaust gas quality. If these particles are directly discharged into the air, they will cause great harm to the human body and the environment. Particles with a particle size of less than 10 μm can pass through the human nasal cavity and mucous membranes directly. Enter the human body; particles with a particle size of less than 1 μm can enter the alveoli of the hum...

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Problems solved by technology

[0011] Aiming at the above defects or improvement needs of the prior art, the present invention provides a particle sensor and its manufacturing method. The particle sensor solves the problem of capacitive particle sensor response by adding capacitance and reference circuit to change the working mode in real time. The signal is limited by the volume (electrode area) and structure, and the existing technical problems in the detection process of the existing particle sensor are that it cannot detect continuously, requires a long start-up and regeneration time, has a long detection cycle, and cannot detect in real time

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