Exhaust temperature heat management method and equipment

Abstract

The embodiment of the invention provides an exhaust temperature heat management method and equipment. The method includes the steps that the opening of an accelerator of an engine, the aftertreatmenttemperature of an SCR system, the rotating speed of the engine and the working manner of the engine are acquired; and when it is detected that the opening of the accelerator is smaller than or equal to a preset opening threshold value, the aftertreatment temperature is smaller than or equal to a preset temperature lower limiting value, the rotating speed of the engine is located within a preset rotating speed threshold value range value and the working manner of the engine is in a preset manner, an exhaust butterfly valve is controlled to hold breath in order to increase the exhaust temperature, it can still be guaranteed that the exhaust temperature is located in the temperature needed by aftertreatment when the vehicle speed is low, the accelerator is low, the engine returns to an idlingstate and the load of the engine is low, the temperature of an aftertreatment carrier is increased, a good oxidizing effect is achieved, nitrogen oxides in tail gas are effectively reduced, generation of carbon particles is reduced, and the DPF carbon deposition amount is reduced.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of engines, in particular to a method and equipment for thermal management of exhaust gas temperature. Background technique [0002] With the increasingly stringent national regulations and the improvement of vehicle emission levels, diesel engine drainage levels are gradually increasing, and the requirements for vehicle exhaust management capabilities are becoming more and more stringent. Improving the thermal management capabilities of engine exhaust can greatly reduce pollution in exhaust gas production of things. [0003] At present, in electronically controlled engines, thermal management generally uses the air intake throttle valve to hold the air, thereby reducing the amount of gas entering the cylinder to increase the exhaust temperature of the engine; when the exhaust temperature is increased, the after-treatment carrier is increased. problem, thereby promoting the reducing ab...

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Problems solved by technology

[0005] The embodiment of the present invention provides a thermal management method and equipment for exhaust gas temperature to overcome the problem that due to the slow vehicle speed and low throttle, the engine often returns to idle speed, the engine load is low, and the exhaust temperature is still low only through the air intake throttle valve. The problem

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