Integrated urea solution sensor

Abstract

The invention provides an integrated urea solution sensor. A main body of the integrated urea solution sensor is a plastic tray, a liquid level sensor, a concentration sensor and a temperature sensorare arranged on the plastic tray, and a control unit is arranged below the plastic tray; the plastic tray is outwards provided with a liquid suction pipe joint, a water inlet pipe joint and a water outlet pipe joint; the plastic tray is connected with a heating pipe through a water inlet pipe connector, and the other end of the heating pipe is connected to a water outlet pipe connector. The liquidlevel sensor, the concentration sensor and the temperature sensor are connected to an automobile CAN bus through the control unit, so that the engine can monitor the liquid level height, concentration and temperature of a urea solution in the urea box in real time. According to the integrated urea solution sensor arranged at the bottom of the urea box through the hot melting welding process, thenumber of parts is small, the cost is low, the heating efficiency is high, the risk of sealing failure is avoided, the reliability is high, and crystallization can be avoided to the maximum extent.

Description

technical field [0001] The invention relates to an SCR urea solution injection system for the treatment of diesel vehicle tail gas of National VI, in particular to an integrated urea solution sensor. Background technique [0002] Most of the existing urea liquid level sensors are reed switch or magnetoresistive liquid level sensors, which are integrated with a suction pipe, a liquid return pipe, and an overflow pipe, which are fixed on the top of the urea tank and extend vertically downward to the urea tank The bottom, and the urea is heated by the engine cooling circulating hot water or electric heating. [0003] When the solution in the urea tank is continuously decreasing, because the outlet pipe, return pipe and overflow pipe of the suction pipe are fixed on the top of the urea tank, the urea solution at each nozzle is easy to crystallize due to the temperature drop, and the crystallized crystals are directly Blocking the orifice makes the urea solution unable to work n...

AI Technical Summary

Problems solved by technology

[0005] The sensor with this structure not only has the shortcomings of easy crystallization of urea solution and high failure rate of the sensing element, but also has the disadvantages of high cost of the sensing element, many parts, low assembly efficiency, and easy failure of the seal. There is a disadvantage that the energy consumption of the battery is too large, which will cause the battery to lose power

[0006] The notification number CN 104564258 A provides a tank liquid level sensor, which integrates a urea suction pipe, a urea return pipe and a hot water pipe, which are fixed on the top of the urea tank and heated by the engine cooling circulating hot water. Heat transfer and fitting fixation through thermal fins, this solution has the risk of seal failure due to loose connections

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