A device for improving the accuracy of sensor measurement

Abstract

The invention discloses a device for improving the measurement accuracy of a sensor. The device comprises a shell of a catalysis silencer, wherein a catalysis unit is arranged in the shell, a sensor is arranged on the upper wall of the shell at one side of the catalysis unit, an air outlet channel is formed in the side wall of the shell below the sensor, a zone defined by the catalysis unit, the air outlet channel and the sensor jointly in a surrounding manner forms a gas containing cavity in the shell, a turbulent flow baffle which is opposite to the air outlet end of the catalysis unit and is of an arc-shaped spherical structure is arranged in the gas containing cavity, the bottom end of the turbulent flow baffle is connected with one end, positioned in the shell, of the air outlet channel and is close to the catalysis unit, and the turbulent flow baffle extends to the side wall of the shell in an inclined upward manner from the air outlet channel; the turbulent flow baffle divides the gas containing cavity into a gas return cavity and a thermal insulation cavity. The device disclosed by the invention has the advantage that the sensor measurement accuracy and working efficiency of an SCR are improved.

Description

technical field [0001] The invention relates to the technical field of power machinery, more specifically, it relates to a device for improving the measurement accuracy of a sensor. Background technique [0002] The existing diesel engine SCR injection system determines the injection amount of urea through the sensing results of front and rear temperature sensors and NOx sensors. The components included in the catalytic muffler reaction process of the system are as follows according to the gas flow direction: catalytic muffler inlet - front temperature sensor - catalytic unit - rear temperature sensor, NOx sensor - catalytic muffler outlet. During the reaction process, the front and rear temperature sensors control the injection amount of urea by measuring the temperature of the exhaust gas, and the NOx sensor measures whether the NOx content of the reacted gas reaches the standard. In the current device, the sensor is located on the housing of the catalytic converter, and ...

AI Technical Summary

Problems solved by technology

The existing SCR injection system for diesel engines has the following disadvantages: 1. The gas is directed downward at the gas outlet, and the gas flow rate is too fast, resulting in less gas that can be sensed by the sensor, inaccurate measurement data, and reduced SCR working efficiency; 2. After The temperature of the gas after the reaction is high, resulting in a higher temperature of the catalyst housing

Images