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Noncontact-type EGR (Exhaust Gas Recirculation) valve position sensor

An exhaust gas recirculation valve, non-contact technology, applied in the field of sensors, can solve problems such as damage, sensor failure, frequent sliding of contacts, etc., and achieve the effects of prolonging working life, accurate and more stable output signals, and good linear output characteristics

Inactive Publication Date: 2012-03-21
HEFEI BANGLI ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the contact frequently slides, the sensor is easily invalidated and damaged due to wear, and the output linearity is difficult to control, the invention provides a non-contact exhaust gas recirculation valve position sensor with an improved structure

Method used

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  • Noncontact-type EGR (Exhaust Gas Recirculation) valve position sensor
  • Noncontact-type EGR (Exhaust Gas Recirculation) valve position sensor

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Embodiment

[0019] see figure 1 and figure 2 , The non-contact EGR valve position sensor includes a housing 1 , a circuit board 7 , a guide post 6 , a magnet block 5 , a Hall chip 2 , a terminal pin 3 and a rear cover 8 . The housing 1 is in the shape of a straw hat, and a guide post 6 is installed in the blind hole in the middle of the housing. The upper part of the guide post 6 is a square prism, and the lower part is a cylinder. . Two pull-back springs 4 are installed between the top surface of the quadrangular prism on the upper part of the guide post 6 and the bottom of the blind hole of the housing 1, and the magnet block 5 is embedded on one side of the quadrangular prism on the upper part of the guide post 6, corresponding to the Hall chip The surface of the magnet block 5 is an arc surface, which ensures that when the magnet block 5 moves, the sensing surface of the Hall chip 2 can obtain a linearly changing magnetic field; the length of the magnet block 5 is 12mm, and the di...

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Abstract

The invention relates to a noncontact-type EGR (Exhaust Gas Recirculation) valve position sensor. The sensor is provided with a hat-shaped shell, a guide pole is arranged in a blind hole in the middle of the shell, the other end of the guide pole extends outwards, a pull-back spring is arranged between the guide pole and the bottom of the blind hole of the shell, a magnet block is arranged on theupper lateral surface of the guide pole, a circular circuit board is sleeved at the lower part of the guide pole, and a hall chip is welded on the circuit board through conductor pins in a straight bar shape and arranged in the blind hole at the magnet block side of the shell. The invention is used for solving the problem of contact abrasion of the sensor and has greatly prolonged working servicelife, favorable linear transmission characteristics and more accurately and stably output signals. When a hall element axially moves along the lateral surface of the magnet block, and a linearly-variable magnetic field can present in a certain displacement range, is linearly converted by the hall chip and finally outputs a linearly-variable voltage. The invention achieves the linear output requirement of the EGR position sensor by utilizing the favorable linearity characteristic in the region.

Description

technical field [0001] The invention belongs to the technical field of sensors, in particular to a position sensor of an exhaust gas recirculation valve of an engine. Background technique [0002] Exhaust gas recirculation (EGR) systems are used to reduce emissions of nitrogen oxides (NOX) in engine exhaust. Nitrogen and oxygen can only react chemically under the conditions of high temperature and high pressure. The temperature and pressure in the combustion chamber of the engine meet the above conditions, especially during forced acceleration. The exhaust gas recirculation valve position sensor (hereinafter referred to as the EGR valve position sensor) is a key component in the recirculation system. Its main function is to accurately measure the EGR valve position so that the ECU can implement control to achieve the best engine EGR rate. When the engine is running under load, the EGR valve opens, allowing a small amount of exhaust gas to enter the intake manifold and enter...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01B7/00G01D3/028F02M25/07F02M26/48
CPCY02T10/121Y02T10/12
Inventor 方锡邦周守元周革
Owner HEFEI BANGLI ELECTRONICS
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