Urea solution metering injector and control method thereof
A solution and urea technology, which is applied to the electronic control of exhaust gas treatment devices, noise reduction devices, exhaust devices, etc., can solve the problems of difficult flow of urea solution, fluctuation of urea solution pressure amplitude, etc., so as to improve control accuracy and prevent device rupture. , the effect of reducing pressure fluctuations
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[0022] The present invention will be further described below in conjunction with the drawings and specific implementations of the specification.
[0023] Such as figure 1 As shown, a urea solution metering and spraying device includes a pump 5, a urea tank 1, a stepping motor 13, and a nozzle 9. It is characterized in that the outlet of the urea tank 1 sequentially passes through a pre-filter 2, a first variable volume The part 3 and the first check valve 4 are connected to the inlet end of the pump 5, and the output end of the pump 5 is sequentially connected to the nozzle 9 through the second check valve 6, the second variable volume part 7 and the filter 8 A stepping motor 13 is connected to the pump 5; a pressure valve 11 is provided between the filter 8 and the nozzle 9; a sensor 10 is provided between the nozzle 9 and the filter 8. The stepping motor 13 is connected to a control unit 12, and the control unit 12 is connected to the sensor 10 and the nozzle 9. The control un...
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