Control device and control method for throttle valve assisted DPF regeneration temperature increase

Abstract

The invention relates to a control device and a control method for throttle valve assisted DPF regeneration temperature increase. An air inlet throttle valve is arranged at the front end of an air inlet manifold, an engine is connected with the back end of the air inlet manifold, an engine pedestal is connected with the engine, an exhaust manifold is connected with the tail end of the engine, a catalytic oxidation device is connected with the exhaust manifold through an exhaust pipe, the back end of the catalytic oxidation device is connected with a particulate catcher, and an EGR valve is arranged between the exhaust pipe and an air inlet pipe of the engine. During DPF active generation, the exhaust temperature is increased by controlling the opening of the throttle valve. The method is simple, the exhaust temperature during DPF active generation is increased on the premise that the performance parameters of a diesel engine system are not changed, and the opening of the air inlet throttle valve is controlled stably and reliably.

Description

technical field [0001] The invention relates to a control device and control method for a throttle valve to assist DPF regeneration and temperature raising [0002] The invention belongs to the technical field of diesel exhaust particle pollution control. Background technique [0003] In the diesel engine equipped with DPF post-treatment; it is necessary to regularly carry out active regeneration control on the DPF system to oxidize the carbon particles trapped in the DPF carrier; the active regeneration process is through diesel engine measures: make the exhaust temperature before DOC reach about 300 °C , and then use an external heat source to release heat through the catalytic oxidation of DOC, so that the temperature of the exhaust gas entering the DPF reaches about 600 ° C; the particles are oxidized to achieve regeneration. The oxidation condition of DOC to the external heat source is 300°C. By adjusting the fuel injection timing of the diesel engine and multiple post...

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Problems solved by technology

If the opening of the air intake throttle valve is too small, the amount of intake air will be seriously insufficient, which will lead to the deterioration of combustion in the cylinder of the diesel engine, a substantial increase in the fuel consumption rate, and poor stability. In severe cases, it will even cause the diesel engine to stall; If the temperature is too high, the exhaust temperature will not increase significantly, and the oxidation efficiency of DOC to HC will decrease during active regeneration, which will easily cause secondary pollution of HC emissions; therefore, considering the fuel consumption rate of diesel engines and meeting the exhaust temperature during active regeneration Under the premise of the oxygen content in the exhaust and the exhaust gas, the opening of the intake throttle valve needs to be selected within a reasonable range

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