Partial flow equivalently-dynamic diluting and sampling system for diesel engine exhaust particles and control method

A sampling system and diesel engine technology, applied in the field of dynamic dilution sampling system and control, can solve the problems of high price and difficult to meet domestic demand, and achieve the effect of convenient operation, low cost of testing and maintenance, and stable flow state

CN103018079BInactive Publication Date: 2015-06-10JILIN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2015-06-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a partial flow equivalently-dynamic diluting and sampling system for diesel engine exhaust particles and a control method, belonging to the technical field of engine emission tests. The partial flow equivalently-dynamic diluting and sampling system is used for splitting the flow of engine exhaust with a constant ratio and introducing the engine exhaust in a diluting air duct by virtue of a flow-splitting and diluting pipeline with closed-loop feedback control, mixing the engine exhaust with clean air to form uniform diluted exhaust gas, introducing the diluted exhaust gas with a constant ratio in a sampling channel filter paper retainer by virtue of a particle sampling pipeline with closed-loop feedback control, collecting the exhaust particles by sampling filter paper placed in the retainer, and then detecting the emission level and the constituents of the diesel engine particles; the partial flow equivalently-dynamic diluting and sampling system can realize two-way transmission for data by an upper computer and a lower computer via an RS232 serial port communication protocol and a customized data format; and compared with the existing test system for diesel engine exhaust particles, the system has no need of a mass flow meter and an exhaust concentration analyser, and has the advantages of being high in control accuracy and low in test and maintenance costs.
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Description

technical field

[0001] The invention belongs to the technical field of engine emission testing, and relates to a dynamic dilution sampling system and a control method such as partial flow of diesel engine exhaust particles. The system adopts a split dilution method with a dynamic probe and partial sampling, and controls the split flow rate flowing through the split dilution pipeline and the particle sampling pipeline through a designed closed-loop feedback control system, so that the split ratio is always equal to the sampling probe and the exhaust pipe (or Dilution air duct) cross-sectional area ratio to achieve isokinetic sampling. Exhaust particulates are collected by the sampling filter paper placed in the filter paper holder, and then the particulate emission level and its composition of the diesel engine can be tested. Background technique

[0002] To carry out research on diesel engine exhaust particulates, a particulate dilution sampling system that complies with in...

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Embodiment Construction

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings.

[0026] The working principle of the present invention is as follows:

[0027] The electronic control unit 20 (lower computer) is powered on and starts to work, and after the serial port of the upper computer 21 is correctly configured, the upper and lower computers can realize bidirectional data transmission through the RS232 serial port communication protocol and a self-defined data format. The PIT interrupt service routine pre-stored in the electronic control unit 20 is responsible for collecting the signals of the temperature sensor 19, the opening degree of the proportional valve I15, the opening degree of the proportional valve II16, the micro-pressure difference sensor I17, and the micro-pressure difference sensor II18 every 10 ms. And transmit the collected data to the upper computer 21 every 1s for the user to monitor the state of the system. Simulta...