Internal combustion engine exhaust temperature control device capable of achieving sectional pressure and temperature adjustment

Abstract

The invention relates to an internal combustion engine exhaust temperature control device capable of achieving sectional pressure and temperature adjustment. The internal combustion engine exhaust temperature control device is mainly composed of a temperature and pressure adjustor, a control unit and various electromagnetic valves. The temperature and pressure adjustor can be used for achieving sectional pressure and temperature adjustment so that a heat storage working medium can be basically kept near a preset target state, meanwhile, high temperature and high pressure are maintained in a state constant box, and the capability of heating low-temperature waste gas is achieved all the time. The heat storage working medium in the temperature and pressure adjustor can absorb and store heat of the high-temperature waste gas, after subsequent low-temperature waste gas passes through, heat can be transferred to the low-temperature waste gas again, and therefore control over the temperature of the waste gas is achieved. A control module controls a path of the waste gas according to a signal of a waste gas temperature sensor, when the temperature of the waste gas is in an efficient temperature window required by postprocessing, the waste gas directly flows into a postprocessor through a waste gas direct-through pipe, and when the temperature of the waste gas is not in the efficient temperature window required by postprocessing, the waste gas flows through the temperature and pressure adjustor to be subjected to temperature adjustment and then flows into the postprocessor.

Description

technical field [0001] The invention belongs to the field of recovery and utilization of residual energy of exhaust gas of internal combustion engines, and also belongs to the technical field of post-treatment of internal combustion engine emissions. Background technique [0002] With the increasingly stringent emission regulations, it is difficult for internal combustion engines to meet the emission requirements solely by in-engine purification technology, so exhaust after-treatment technology is particularly important for improving the emission level of internal combustion engines, but the existing after-treatment devices have stricter requirements on exhaust gas temperature , the post-treatment device has a high conversion efficiency only in a very narrow temperature window. However, the exhaust gas temperature of the internal combustion engine for vehicles fluctuates in a large range and is highly transient, which will lead to a poor treatment effect of the after-treatmen...

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Problems solved by technology

[0002] With the increasingly stringent emission regulations, it is difficult for internal combustion engines to meet emission requirements solely by in-engine purification technology, so exhaust after-treatment technology is particularly important for improving the emission level of internal combustion engines, but the existing after-treatment devices have stricter requirements on exhaust gas temperature , the post-treatment device has a higher conversion efficiency only in a very narrow temperature window, but the exhaust gas temperature of the internal combustion engine for vehicles fluctuates in a large range and is highly transient, which will lead to a poor treatment effect of the after-treatment device, so The purpose of the present invention is to control the temperature of the exhaust gas and control it within the high-efficiency temperature window required by the after-processor, which is of great significance for improving the emission level of the internal combustion engine

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