Automobile urea concentration detection system and method based on ultrasonic waves

Abstract

The invention provides an automobile urea concentration detection system and method based on ultrasonic waves. The system comprises a urea solution tank which is used for the preparation, detection and storage of a urea solution; a urea particle filling machine which is used for filling urea particles into the urea solution tank; a purified water filling machine which is used for filling purifiedwater into the urea solution tank; a urea solution filling machine which is used for filling a urea solution with a preset concentration into the urea solution tank; a temperature adjustable box in which the urea solution tank is arranged; and an ultrasonic sensor which comprises an ultrasonic transmitter and an ultrasonic receiver, wherein the ultrasonic transmitter and the ultrasonic receiver are oppositely installed on the inner side wall of the urea solution tank. The ultrasonic sensor is adopted to detect urea solution concentrations, the detection mode is simple and convenient, the ureasolution concentrations at different temperatures can be effectively detected, and the system has the advantages of high accuracy of urea solution concentration detection data, simple and convenient detection mode, good real-time performance and the like.

Description

technical field [0001] The invention relates to the field of urea concentration detection, in particular to an ultrasonic-based automobile urea concentration detection system and detection method. Background technique [0002] At present, automobiles, as the main means of transportation on the road, have been fully popularized in every family life, and correspondingly, it is necessary to prevent automobile exhaust pollution. Carbon dioxide (CO2), sulfide SOx (SO and SO2), nitrogen oxides NOx (NO and NO2), and chlorofluorocarbons in automobile exhaust make atmospheric environmental problems such as greenhouse effect, ozone layer destruction and acid rain more serious; CO, NOx, SOx, unburned hydrocarbons HC, particulate matter PM and odorous gases in the tail gas pollute the air, which is very harmful to humans, animals and plants. [0003] The exhaust emissions of diesel vehicles must meet the new national emission standards. In the automobile manufacturing industry, it is n...

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Problems solved by technology

[0004] 1. At present, the concentration of urea tank solution in most diesel vehicles is still detected by the traditional method. It is obtained by calculating the ratio of the solvent mass to the solution mass. Each test needs to know the mass of the initial solvent and solute. Statistics are very inconvenient, and the real-time performance of data detection is poor. ;

[0005] 2. The temperature of the urea tank changes greatly under different operating conditions of the car, which will cause the concentration of the urea tank solution to change accordingly. The concentration of the urea solution obtained by the traditional detection method is inaccurate, which will cause the exhaust emission to fail to meet the standard

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