Device for simulating the evolution process of an internal combustion engine exhaust particle flow for reducing automotive emissions

A device for simulating the evolution process of an internal combustion engine exhaust particle flow for reducing automotive emissions, which is characterized by comprising:

• an exhaust source, used to produce high temperature exhaust gas;
• an exhaust channel, comprising a plurality of sections of cylindrical tubes of predetermined length, and the plurality of sections of cylindrical tubes with specified length that are fixedly connected;
• wherein one end of the exhaust channel is close to the exhaust source, and the other end thereof is away from the exhaust source;
• a soluble organic compound generator, used to generate soluble organic compounds;
• wherein the soluble organic compound generator comprises a fuel injector, an injector control unit, an injector adapter, and a tapered tube;
• a lower surface of the injector adapter is welded with a small end of the tapered tube concentrically, and a nozzle of the fuel injector is located in the center of the tapered tube;
• a large end of the tapered tube is welded to the end of the exhaust channel that is close to the exhaust source through a cylindrical tube, and with a first distance from the top of the exhaust channel;
• the oil in the fuel injector is a mixed liquid formed by a lubricating oil and gasoline or diesel according to a certain proportion;
• a carbon particle generator, used to generate carbon particles;
• the carbon particle generator comprises a smoke chamber, an ultrasonic atomizer, a mixing motor, a support plate, a jet vacuum pump, and a high-pressure nitrogen gas bottle;
• wherein the ultrasonic atomizer is arranged in the bottom of the smoke chamber;
• a rotating shaft of the mixing motor is supported by the support plate;
• the support plate is arranged above the level of the smoke chamber;
• a hole is arranged on the cover of the smoke chamber and is connected to a suction port at the lower part of the jet vacuum pump;
• an inlet of the jet vacuum pump is connected to the high-pressure nitrogen gas bottle;
• an outlet of the jet vacuum pump is connected to the end of the exhaust channel close to the exhaust source through a metal transfer pipe, which has a second distance from the top of the exhaust channel;
• the heat source is placed under the smoke chamber and used to heat the smoke chamber;
• an outer wall of the metal transfer pipe is wrapped with a heating cable, and the heating cable is peripherally wrapped with insulating asbestos;
• a probe connected to a thermocouple of a temperature controller is arranged at the end of the heating cable for monitoring the temperature at the end of the metal transfer pipe;
• a sampling hole and a temperature measurement point are arranged at the downstream port position of each section of the cylindrical tube of the exhaust channel;
• and the sampling hole and the temperature measuring point are used for sampling and temperature measurement of particles along the way;
• a laser extinction test system, comprising a quartz glass tube connected to the end of the exhaust channel, and a probe for collecting a scattered light;
• the system is used to compare the light intensity before and after the laser crosses through the exhaust gas, and calculate the soot volume fraction Cv in an exhaust pipe according to the following formula below:
• C
• v
• =
• α
• ⁢
• λ
• 6
• ⁢
• π
• ⁢
• ⁢
• LK
• ⁡
• (
• χ
• )
• ⁢
• ln
• ⁡
• (
• I
• I
• 0
• )
• wherein, α is the correction coefficient;
• λ is a wavelength of the laser;
• L is the optical path length;
• χ0 the complex refractive index of soot;
• K(χ) is the function of a complex refractive index
• K
• ⁡
• (
• χ
• )
• =
• Im
• ⁡
• (
• m
• 2
• -
• 1
• m
• 2
• +
• 2
• )
• ;
• I0 is the intensity of an incident light;
• I is the intensity of an output light;
• a feedback control system, which is used to compare the concentration of soot in the exhaust pipe with a preset threshold, and generate a control signal according to the comparison result, and feed the control signal back to a nitrogen control unit of the nitrogen source and the injector control unit so as to change the gas supply pressure of the nitrogen source and the pulse width of the fuel injector.