Calculation method of DPF regeneration compensation value based on fuel consumption

Abstract

The invention discloses a calculation method of DPF regeneration compensation value based on fuel consumption, and is applied to engine cold starting working condition. The compensation value calculation method comprises the following steps of performing searching in a starting torque pulse table through the water temperature of an engine and the rotating speed of the engine, so as to obtain break-out torque coefficients; through the break-out torque coefficients and atmospheric pressure value, performing searching in a break-out correction factor pulse table to obtain correction factors; multiplying the fuel consumption with correction factors to obtain the fuel consumption under the starting condition; and performing integration based on running time through the fuel consumption under the starting condition according to the time required by that the engine is under the starting state to obtain the fuel consumption under the starting condition. According to the compensation value calculation method disclosed by the invention, the temperature, the rotating speed, the break-out torque coefficient and the correction factors of the engine during cold starting are sufficiently considered, so that DPF regeneration compensation value under the cold starting working condition based on the fuel consumption can be accurately calculated.

Description

technical field [0001] The present invention relates to the field of engine testing, in particular to a control optimization for regenerating DPF (Diesel Particulate Filter) based on fuel consumption algorithm in engine aftertreatment, which is carried out according to engine state, atmospheric pressure, and ambient temperature. Calculation method of DPF regeneration compensation value based on fuel consumption. Background technique [0002] Such as figure 1 As shown, the current general after-processing DPF is calculated based on fuel consumption to trigger regeneration as follows: [0003] Use the "total fuel consumption" obtained by integrating the "fuel consumption rate A" based on the running time to subtract the "last regeneration fuel consumption B" to obtain the "fuel consumption C based on the current regeneration condition", use " Based on the comparison between the fuel consumption C" under the current regeneration condition and the "maximum fuel consumption D (...

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Problems solved by technology

[0005] 1. In the cold start condition of plateau or alpine region, due to the difficulty of starting, the common practice is to increase the fuel injection amount at low temperature, and the combustion situation at low temperature is poor, and a large amount of soot will be generated, resulting in DPF at low temperature. In the case of starting, the carbon accumulation is very serious

The existing technology does not consider this situation, which leads to the inability to accurately judge the timing of active regeneration, and in severe cases, it will cause the DPF to burn out

[0006] 2. From the perspective of emission regulations, it is impossible to accurately judge the timing of active regeneration, which will bring the risk of excessive emission

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