Device for improving low-temperature starting performance of SDPF and control method of device

Abstract

The invention belongs to the field of power machinery and engineering, and provides a device for improving the low-temperature starting performance of an SDPF on one hand. The device comprises an SDPF carrier, an actuator 2 and a controller 1. The actuator 2 is installed on the inlet side of the SDPF carrier, and the controller 1 is connected with the actuator 2. The actuator 2 comprises a valve plate 201 and a valve plate 202, and the controller 1 controls the opening degree of the valve plate 201 and the valve plate 202 to control the area of airflow entering the SDPF carrier so as to adjust the number of hole channels through which the SDPF carrier can pass. On the other hand, the invention provides a control method of the device for improving the low-temperature starting performance of the SDPF. The control method comprises the steps that S1, exhaust inlet parameters are obtained; S2, the appropriate exhaust heating power Kbest is calculated; S3, the optimal exhaust valve opening degree is obtained according to the optimal exhaust heating power Kbest; and S4, an exhaust valve is controlled through opening parameters of the exhaust valve. By means of the device and the method, the structure is simple, temperature rise control is flexible, and the temperature rise rate of different SDPF carriers can be increased.

Description

technical field [0001] The invention relates to the field of power machinery and engineering, in particular to a device for improving the low-temperature starting performance of SDPF and a control method thereof. Background technique [0002] Due to its good power and economy, diesel engines are widely used in transportation, agricultural machinery and construction machinery and other fields. However, diesel engines produce more particulate matter and nitrogen oxide (NOx) emissions, causing greater pollution to the atmospheric environment and a greater threat to the health of residents. [0003] Diesel particulate filter (DPF), which can trap particulate matter and prevent particulate matter from being emitted into the atmosphere. DPF will continue to accumulate particulate matter during use, which will increase the exhaust back pressure and affect the normal operation of the diesel engine. Therefore, the temperature of the particulate matter trapped in the DPF is generall...

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Problems solved by technology

However, due to the extremely low reaction efficiency of SCR catalysts at low temperatures, urea is generally not sprayed at low temperatures, resulting in extremely high NOx emissions at low temperatures

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