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A Thermal Dilution Sampling System for Exhaust Particles of In-Cylinder Direct Injection Gasoline Engine

An in-cylinder direct injection and sampling system technology, applied in sampling devices, preparation of test samples, etc., can solve problems such as poor dilution ratio control accuracy and inability to control dilution temperature.

Inactive Publication Date: 2017-08-25
JILIN UNIV
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Problems solved by technology

[0004] In order to overcome the deficiencies of the prior art that can only be manually adjusted, the dilution ratio control accuracy is poor, and the dilution temperature cannot be controlled, the present invention provides a thermal dilution sampling system for exhaust particles of direct injection gasoline engines in cylinders

Method used

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  • A Thermal Dilution Sampling System for Exhaust Particles of In-Cylinder Direct Injection Gasoline Engine
  • A Thermal Dilution Sampling System for Exhaust Particles of In-Cylinder Direct Injection Gasoline Engine
  • A Thermal Dilution Sampling System for Exhaust Particles of In-Cylinder Direct Injection Gasoline Engine

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Embodiment Construction

[0032] The embodiment of the present invention will be described in detail by taking the overall dilution ratio of 200:1, the dilution temperature of the primary thermodilution system at 200°C, the evaporation temperature of the volatile particle removal system at 300°C, and the sampling before the turbine as examples.

[0033] The electronic control unit of the present invention adopts the 9S12XDP512 model single-chip microcomputer as the core chip. When working, the system is powered on first, and the single-chip microcomputer then performs internal module initialization, including PWM initialization, ATD initialization, I / 0 initialization, PIT initialization, SCI initialization, and phase lock. Ring initialization, etc., and then enter the main loop function. The main loop function includes AD conversion function, temperature PID controller function, opening PID controller function, and opening control function. In addition, every time the microcontroller receives an SCI rece...

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Abstract

An in-cylinder direct-injection gasoline engine exhaust particulate thermal dilution sampling system belongs to the technical field of engine emission testing. It consists of a split multi-point sampling unit, a primary thermal dilution unit, a volatile particle removal unit, a secondary dilution cooling unit, and an electronic control unit. and other modules. The split multi-point sampling unit performs split sampling on different sampling points of the engine; the first-stage thermal dilution unit performs first-stage thermal dilution on the sample gas with controllable process temperature; the volatile particle removal unit uses a heater to remove volatile and semi-volatile particles from the sample gas. The secondary dilution and cooling unit uses the secondary dilution and cooling that can accurately control the dilution ratio of the sample gas; the electronic control unit monitors and controls the working status of the entire system in real time; compared with the existing technology, the system It has the advantages of multi-point sampling, controllable dilution temperature, high control precision of total dilution ratio, and avoids volatile and semi-volatile components from affecting test accuracy and test repeatability.

Description

technical field [0001] The invention belongs to the technical field of engine emission testing, and relates to an in-cylinder direct-injection gasoline engine exhaust particle thermal dilution sampling system. Background technique [0002] Due to the fact that the number of gasoline engines is much larger than that of diesel engines, and that the in-cylinder direct-injection gasoline engine, which is the main development direction of gasoline engines in the future, has high particulate emissions, many researches have been carried out at home and abroad on the particulate matter emissions of in-cylinder direct-injection gasoline engines, and emission regulations have also been implemented. Clear restrictions have been made on particulate matter emissions from in-cylinder direct-injection gasoline engines. [0003] Research and testing in this area first require a dedicated particle sampling system that meets the requirements of emission regulations. The most important parame...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/24G01N1/38
Inventor 麻斌董伟孙耀于秀敏孙平何玲姜麟麟钱丁超徐长建
Owner JILIN UNIV
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