Air pressure type urea metering injection system with two urea pressure containers
A technology of pressure vessel and injection system, which is applied in the direction of exhaust treatment, exhaust device, machine/engine, etc., can solve the problem of high energy consumption of the battery, reduce the pressure wave in the pipe, improve the accuracy and stability of measurement, and eliminate adverse effects
Inactive Publication Date: 2014-08-27
SOUTHWEST JIAOTONG UNIV
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[0003] In order to solve the problem of high energy consumption of the battery in the prior art and the shortcomings in the design of the pneumatic urea injection metering device, the present invention provides a new structure SCR urea injection system using a gas pressure source
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[0014] The present invention will be further described below in conjunction with drawings and embodiments.
[0015] The invention is a urea injection system using a gas pressure source, wherein the gas pressure source can be a high-pressure gas storage bottle, or an air compressor and a gas storage tank, and the working principles of the two methods are similar. Now take the implementation of an air compressor and an air storage tank as an example.
[0016] The air storage tank 2 is inflated by a small air compressor through the compressed air inlet. As a gas pressure source for vehicles, the working pressure is generally 0.8-1.0MPa. 17 is urea pressure vessel 1, and the urea pressure vessel 1 volume that present embodiment selects is 1L, and gas pressure source and urea pressure vessel and relevant valve system constitute urea pump. The air intake solenoid valve 30 of the urea pressure vessel I is in the closed state, the connection switch solenoid valve 19 of the urea pres...
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The invention discloses an air pressure type urea metering injection system with two urea pressure containers. The system is provided with the first urea pressure container and the second urea pressure container, wherein the first urea pressure container and the second urea pressure container are respectively connected with a compressed air source to be used as a urea supply device, and the second urea pressure container is used for achieving the urea injection function. The first urea pressure container and the second urea pressure container are provided with electromagnetic valves respectively, connected with the compressed air source and provided with emptying electromagnetic valves. The first urea pressure container is connected with the second urea pressure container through the electromagnetic valves. The first urea pressure container is connected with the urea supply device. The second urea pressure container is connected with a urea injection mechanism. A controller is electrically connected with the electromagnetic valves and controls on-off of the electromagnetic valves, and constant air pressure is generated through adjustment of an air inlet electromagnetic valve and an air exhaust electromagnetic valve to be used for pressurizing a urea solution. According to the air pressure type urea metering injection system, due to the fact that the pressure of a urea nozzle inlet is constant, the internal tube pressure wave caused by pulse injection of the urea solution is remarkably reduced, and metering accuracy and stability of the injection amount of the urea solution are improved.
Description
technical field [0001] The present invention relates to a urea injection system for post-treatment of diesel engine exhaust, which belongs to the exhaust gas purification system of internal combustion engines; more specifically, it relates to a urea solution that uses a gas pressure source as power to inject urea solution to the exhaust system of a diesel engine to reduce Selective Catalytic Reduction SCR System for Diesel Engine NOx Emissions. Background technique [0002] In order to realize urea injection, the existing SCR urea injection system basically adopts two injection methods: air-assisted and non-air-assisted. Its working principle is to use a DC electric pump to pressurize the urea solution. The electric pump needs to be powered by the battery in both on-road and off-road vehicle and marine applications, requiring a lot of battery power. Recently proposed pneumatic urea injection systems such as CN102032029A patent, CN102242658A patent, and CN101975103A patent ...
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IPC IPC(8): F01N3/20F01N3/28F01N9/00
CPCY02T10/47Y02T10/40
Inventor 胡广地
Owner SOUTHWEST JIAOTONG UNIV
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