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Method and apparatus for on-line measuring vehicle petrol engine exhaust recirculating rate

A technology of exhaust gas recirculation rate and gasoline engine, which is applied in the direction of measuring device, engine test, machine/structural component test, etc. It can solve the problems of inability to realize EGR rate closed-loop control, lack of EGR rate, combustion instability, etc.

Inactive Publication Date: 2005-02-23
ZHEJIANG UNIV
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Problems solved by technology

However, if the EGR rate is too high, it will lead to unstable combustion, and if it is too small, the effect of reducing emissions cannot be achieved.
Due to the lack of means to measure the EGR rate online in real time, the closed-loop control of the EGR rate cannot be realized

Method used

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  • Method and apparatus for on-line measuring vehicle petrol engine exhaust recirculating rate
  • Method and apparatus for on-line measuring vehicle petrol engine exhaust recirculating rate
  • Method and apparatus for on-line measuring vehicle petrol engine exhaust recirculating rate

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Embodiment Construction

[0066] refer to figure 1 , the measuring device specially designed for implementing the above measuring method is to connect a sequentially connected resistor R1, R2 and power supply E at the junction of the spark plug 1 and the distributor 2 of the gasoline engine cylinder of the vehicle, and connect it in parallel with the spark plug 1; The connection of R1 and R2 is connected with an isolation circuit 3, a filter circuit 4, an amplifier circuit 5, and a single-chip microcomputer 6, in which a DC bias voltage of 200--500V is positively applied between the electrodes of the spark plug 1, after isolation and filtering , After being amplified, it is sent to the single chip microcomputer for sampling and recording. The sampling frequency is 10KHz. The EGR rate of the test engine is controlled by a linear proportional valve driven by a stepping motor, and its opening is determined by the PWM output of the microcontroller. Under the condition that other conditions remain unchang...

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Abstract

A method for on-line measuring waste gas recirculation ratio of vehicle gasoline engine includes executing DC bias voltage forward direction in between spark plug and electrode to change ion directional movement to be ion current; sending it to monolithic computer for sampling and recording after isolating, filtering and amplifying; measuring out waste gas recirculation ratio based on linear coorelation of recirculation ratio to peak value and peak value area. A device for realizing the method is also disclosed by the present invention.

Description

technical field [0001] The invention relates to a method and device for measuring the exhaust gas recirculation rate of a gasoline engine for vehicles Background technique [0002] With the increase of vehicles and the intensification of environmental pollution, the requirements for engine emissions are becoming increasingly stringent. my country is about to adopt Euro II and Euro III standards. These stringent standards mean that emissions must be reduced from the engine itself. Combined with three-way catalytic conversion and other methods, exhaust gas recirculation, or EGR (Exhaust Gas Recirculation), introduces part of the exhaust gas into the combustion chamber after cooling, which can not only reduce HC and CO emissions, but also reduce NO x emission. However, if the EGR rate is too high, it will lead to unstable combustion, and if it is too small, the effect of reducing emissions cannot be achieved. Due to the lack of means to measure the EGR rate online in real t...

Claims

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Application Information

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IPC IPC(8): G01M15/00
Inventor 许沧粟
Owner ZHEJIANG UNIV
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