Method of operating a diesel engine with a view to making it easier to regenerate a particle filter in the exhaust system
A particle filter and engine technology, applied in engine components, combustion engines, machines/engines, etc., can solve problems such as soot pressure drop increase, filter clogging, engine performance loss, etc.
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Embodiment 1
[0049] This example relates to results obtained on a tourist car equipped with a turbocharged direct injection diesel engine (TDI) with 5 cylinders and a capacity of 2460 cm 3 , producing a maximum power of 128kW and a maximum torque of 400Nm.
[0050] The car's exhaust line includes a diesel oxidation catalyst consisting of a platinum-containing 1.2-liter cordierite monolith (110 g / ft 3 (3.9g / dm 3 )) and alumina-based coating (washcoat) composition. A 2.9 liter silicon carbide FAP (200cpsi) is installed in the exhaust line downstream of the diesel oxidation catalyst. This FAP includes a dosage of 40 g / ft on its filter wall 3 (1.4g / dm 3 ) of platinum and alumina to disperse the Pt and make it adhere to the filter.
[0051] The tests were carried out by subjecting the car to a so-called "urban" drive cycle, during which the engine speed was limited to 1500 rpm, which resulted in an average gas temperature of 240°C at the FAP inlet. This drive cycle, which lasted a total o...
Embodiment 2
[0058] This example presents the results of tests performed using the same engine as Example 1, but mounted on an engine stand to determine the balance point, defined as the temperature at which temperature, the system is capable of burning soot at the same rate that the engine produces it. This equilibrium is determined by the temperature that should be applied to the FAP inlet to achieve its pressure drop stabilization.
[0059] The exhaust line of the system is in this case exclusively formed by the FAP described in Example 1. Two tests were carried out with this catalytic filter: the first with diesel fuel without FBC and the second with fuel with added FBC, namely 5 ppm by mass from the same colloidal dispersion as in Example 1 metal iron. A third experiment used the same FBC-supplemented fuel (using the same dispersion of 5 ppm mass of metallic iron), but with silicon carbide FAP without catalytic species.
[0060] The measurement of the equilibrium point was carried ...
Embodiment 3
[0067] This example provides measurements of soot regeneration kinetics at a fixed FAP inlet temperature.
[0068] Two tests were carried out with catalytic filters: the first test was with diesel fuel without FBC, the second test was with fuel added with FBC, namely 5 ppm mass of metallic iron from the same colloidal dispersion as in Example 1 . A third test used the same fuel (5ppm by weight of metallic iron added using the same dispersion), but with a silicon carbide filter without catalytic material.
[0069]Measurements of combustion dynamics were carried out in such a way that the filters were loaded for about 8 hours to reach a counterpressure of 94 mbar on the three systems, which corresponds to 16 g of soot. Loading is carried out as follows: apply an engine speed of 3000 rpm, a torque of 40 Nm, which should be at a filter inlet temperature of 200°C. The FAP was removed and weighed before and after the soot loading step to measure the amount of soot present in the f...
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