Diesel engineexhaustingparticulatecatcher regeneration timejudgment method

Abstract

The invention provides a diesel engine exhausting particulate catcher regeneration time judgment method. The diesel engine exhausting particulate catcher regeneration time judgment method comprises the following steps that (1) the diesel engine series steady-state working condition is selected and the flow of exhaust gas passing through a DPF under various conditions is measured; (2) the before and after pressure drop correspondingto the flow of the exhaust gasunder the different conditions in a no-load state and a load limiting state of the DPF are confirmed; (3)according to the acquired pressure drop value corresponding to the loadlimiting state of the DPF, a DPF regenerationthresholdpressure drop picture is drawn, the drawn threshold pressure drop picture is amended and a final DPF regeneration threshold pressure drop picture is obtained; (4) the exhausting flow corresponding to the selected steady-state working condition of a diesel engine is firstly confirmed, the actually measured before and the after the pressure drop of the DPF is compared with the threshold pressure dropcorresponding to the flow in the threshold pressure drop picture; and (5) whether theactually measured before and the after pressure drop of the DPF is greater than the correspondingthreshold pressure drop or not is judged, and whether the current state of the DPF needs to be regenerated or not is further confirmed. According to the diesel engine exhausting particulate catcher regeneration time judgment method, the regeneration time can be accurately confirmed, and regeneration of the DPF is promoted in time.

Description

technical field [0001] The invention relates to the technical field of post-treatment of diesel exhaust gas, in particular to a method for judging the regeneration time of a diesel exhaust particle filter, and belongs to an innovative technology for judging the regeneration time of a diesel exhaust particle filter. Background technique [0002] There are three main types of exhaust particulate matter from diesel engines: carbon particles (Soot), surface-adsorbed organic soluble matter (Soluble organic fractions, SOF for short) particles, and sulfate particles. Diesel engine exhaust particles are mostly composed of Soot and SOF particles. Diesel Exhaust Particulate Filter (DPF) is a particulate filter installed in the exhaust pipeline of a diesel engine, which captures particulate matter in the exhaust to achieve the purpose of purifying the exhaust. When the diesel engine exhaust flows through the DPF, the particulates in the exhaust are captured by the DPF through intercep...

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Problems solved by technology

Starting regeneration too early will shorten the DPF regeneration cycle, resulting in an increase in the energy consumed by active regeneration, while regeneration too late will increase the heat generated by the combustion of soot during regeneration, increasing the risk of thermal damage to the DPF

Some related studies have proposed that a certain vehicle mileage or working time be used as the timing of DPF regeneration. Although this method is simple, low in cost, and relatively easy to implement, due to the complex and changeable working conditions of diesel engines in actual vehicle operation, these methods are adopted The accuracy of judging the timing of regeneration is not high

Some other studies proposed to use 5% increase in fuel consumption rate of the diesel engine as the determination condition for trap regeneration under the premise of maintaining the same engine speed and output torque. This method improved the accuracy of judging the timing of regeneration, but the engine fuel consumption rate and output Torque needs to be equipped with special testing equipment to measure, which is expensive and inconvenient to use, so the application of this method has certain limitations

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