Method for evaluating heat insulation performance of vehicle exhaust pipe heat insulating layer

Abstract

The invention relates to a method for evaluating the heat insulation performance of a vehicle exhaust pipe heat insulating layer. The method includes the steps of: (1) wrapping the periphery of a vehicle exhaust pipe with a to-be-detected heat insulating layer, and making the vehicle to simulate actual working conditions to operate for a predetermined time; (2) in the simulation operation process, measuring the temperature at the site of 100+ / -5mm at the periphery of a vehicle exhaust pipe assembly and the temperature at the site of 200+ / -10mm at the periphery of the vehicle exhaust pipe assembly respectively to obtain T1 and T2; (3) reading the temperature T3 of a silencer inner sensor of the vehicle's exhaust system; and (4) evaluating the heat insulation performance of the to-be-detected heat insulating layer according to the temperature T1, T2 and T3. According to the method provided by the invention, the evaluation results about the heat insulation performance of different material heat insulating layers are consistent with the automobile industry standard. Therefore, the evaluation method provided by the invention is accurate, can be used for evaluating the heat insulation performance of vehicle exhaust pipe heat insulating layers made of different materials, and provides the basis for selection of vehicle exhaust pipe heat insulating layer materials.

Description

technical field [0001] The invention relates to a method for evaluating the thermal insulation performance of a vehicle exhaust pipe thermal insulation layer. Background technique [0002] Due to the high temperature of the exhaust gas in the exhaust pipe of the engine, the exhaust pipe needs to be insulated to reduce the external heat radiation of the exhaust pipe, and at the same time reduce the temperature drop of the exhaust pipe to ensure the post-treatment catalytic reaction temperature. [0003] In general design, in order to meet the design requirements, the exhaust pipe needs to be wrapped with a heat insulation layer, or a heat insulation board should be added, and a certain distance between other components and the exhaust pipe should be ensured, generally 100mm-200mm. At present, for the selection of insulation layer materials, thermal insulation materials such as mineral wool and centrifugal glass wool are generally selected according to industry habits, but no ...

AI Technical Summary

Problems solved by technology

At present, for the selection of insulation layer materials, thermal insulation materials such as mineral wool and centrifugal glass wool are generally selected according to industry habits, but no one has studied various insulation materials when they are applied to the insulation layer of vehicle exhaust pipes. The heat insulation performance of the vehicle exhaust pipe has caused the limitation of the material selection of the heat insulation layer of the vehicle.