Water condensation monitoring system for monitoring water condensation in dilution channel and method for vehicle emission testing

Abstract

The present invention provides a water condensation monitoring device for monitoring water condensation in a dilution channel. The device is configured to be a system used for a vehicle emission test.The dilution channel has an inlet end and an outlet end. The water condensation monitoring device comprising a first temperature sensor, a humidity sensor and a computing device, wherein the first temperature sensor and the humidity sensor are positioned at the outlet end, and the computing device is configured to receive temperature from the first temperature sensor and humidity readings from the humidity sensor, and to calculate the dew point temperature of moisture within the dilution channel. In addition, the invention further provides a vehicle emission testing system comprising the device and a method for monitoring and controlling water condensation in a dilution channel. By means of the technical schemes, the situation of the water condensation in the dilution channel can be monitored, and the device, system and method are suitable for transformation and upgrading of a dilution system of an existing emission laboratory so as to meet the requirements of related laws and regulations of vehicle emission testing.

Description

technical field [0001] The invention relates to the technical field of vehicle emission testing, in particular to a water condensation monitoring device in a dilution channel, a vehicle emission testing system including the device and a method for monitoring and controlling water condensation in a dilution channel. Background technique [0002] Vehicles (such as gasoline vehicles) will emit a variety of harmful pollutants during use, such as solid suspended particles, carbon monoxide (CO), hydrocarbons (HC), nitrogen oxides (NO x )Wait. As the number of vehicles continues to increase, the problem of air pollution is becoming increasingly serious. In order to reduce the impact of vehicle emissions on the environment, national regulations require vehicles to undergo emission testing and calibration by professional institutions before they go on the market or during use. For example, in the process of vehicle research and development, in order to ensure the actual road emissi...

AI Technical Summary

Problems solved by technology

However, when the external environment and the dilution air are changing and uncontrollable, it is difficult to prevent the condensation of water in the dilution channel, and the condensation of water will dissolve the exhaust gas or take away the particles, which will interfere with the accurate measurement of pollutants

It is known that the chance of water condensation in the dilution channel can be reduced by generally adopting the insulation or heating of the overall dilution channel, but these solutions cannot confirm whether there is water condensation in the dilution channel during the test process, and cannot guarantee the accuracy of the test results sex, and higher cost

[0004] In addition, the current vehicle emission laboratory has not yet had a good engineering design to modify the dilution channel, which cannot meet the requirements of the latest regulations on water condensation monitoring

Therefore, in order to provide vehicle emission test conditions that meet the requirements of relevant regulations, it is necessary to solve the problem of monitoring and control of water condensation in the dilution channel in the vehicle emission test system

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