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.
CN1584540AInactive Publication Date: 2005-02-23ZHEJIANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
ZHEJIANG UNIV
Publication Date
2005-02-23
Estimated Expiration
Not applicable · inactive patent

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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.
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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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