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Broad domain oxygen sensor controller of vehicular gaseous propellant engine

A gas fuel and oxygen sensor technology, applied in engine control, fuel injection control, electrical control, etc., can solve the problems of the internal structure and implementation method of the controller that are not explained, and there are no public reports, so as to improve economy and emissions , to achieve the effect of feedback control, stable and reliable work

Inactive Publication Date: 2010-06-09
BEIJING JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the book does not explain the internal structure and implementation of the controller.
In foreign countries, although there are practical products, there is no public report on its design

Method used

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  • Broad domain oxygen sensor controller of vehicular gaseous propellant engine
  • Broad domain oxygen sensor controller of vehicular gaseous propellant engine
  • Broad domain oxygen sensor controller of vehicular gaseous propellant engine

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] The oxygen sensor used in the present invention is NTK's wide-area oxygen sensor L1H1, which can also be called a linear oxygen sensor. The wide-area oxygen sensor will output a sensor feedback voltage Vs, and this Vs signal may be higher or lower than the voltage signal V ref . When the exhaust gas is rich, Vs>V ref , the feedback control circuit at the back end will generate a unidirectional pump current Ip, and the Ip in this direction can pump the free oxygen in the exhaust pipe into the reference chamber. Lean exhaust gas Vsref , the control circuit at its rear end generates a pump current Ip in the opposite direction, which will pump free oxygen in the reference chamber out into the exhaust pipe. So that the sensor feedback voltage Vs feedback signal returns to V ref near (450mV). Rely on the pump current to achieve this balance, or rely on the pump c...

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Abstract

The invention discloses a controller for a wide-band oxygen sensor for a vehicular gas fuel engine, which comprises a power supply module (3), a heating module (4) and a control module consisting of asignal amplification module (5), a signal determination module (6), a feedback control module (7) and an output amplification module (8). The controller receives and amplifies feedback voltage (Vs) of the oxygen sensor, and outputs VsAf1 and VsAf2; the VsAf1 generates V1 and Vju through the signal determination module; the VsAf2 and the Vju generate V2 through the feedback control module and output Vout via amplification. Pump current (IP) in different directions is generated through determining whether air-fuel ratio is 1 or not and enabling two sides with the air-fuel ratio in 1 to be provided with voltage signals in different directions. Signals of the wide-band oxygen sensor change in the range between 0 and 5V after passing through a back end processor, and output signals and the air-fuel ratio are in a perfect linear relation. The engine can implement the closed-loop control during the transitional working condition.

Description

technical field [0001] The invention relates to the structure and design of a controller of a wide-area oxygen sensor applied to a gas fuel engine for automobiles. Background technique [0002] Today's automobile industry has been developing rapidly. Since the 1980s, the average annual growth rate of the world's motor vehicle ownership is about 3%. A large number of automobiles have brought convenience to life, but also brought many negative effects, the most prominent of which is the exhaust pollution of automobiles. In today's increasingly serious air pollution, motor vehicle emissions have become the fastest growing source of air pollution. In many cities, automobile exhaust pollution has become the main source of air pollutants. In order to control automobile exhaust emissions, automobiles have developed from traditional carburetors to electronic injection systems, using air-fuel ratio closed-loop feedback control systems with oxygen sensors and three-way catalytic re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02D41/14
Inventor 张欣郭林福刘建华何涛
Owner BEIJING JIAOTONG UNIV
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