| Popis: |
We considered the possibility of calculating the temperature ranges of the fresh charge heating degree, which provides favorable conditions for the self-ignition of the combustible mixture in the diesel cylinder at the end of the compression process, as applied to the “cold”-start conditions. We developed a method to determine the degree of the fresh charge heating and the degree of its oxidizer (air oxygen) impoverishment. We studied that the influence of the degree of the intake air heating on the duration of the diesel engine starts at low ambient temperatures. We calculated that the degree of heating is 40–50 degrees for the ambient temperatures from −30 to +5 °C, which ensures the fluid temperature of 287–315 K at the end of the intake. It has been established that the duration of the diesel engine start is reduced intensively up to a certain value of the intake charge heating degree (a 40–60-degree temperature increase), and then, the influence of heating becomes less significant. Thus, at the ambient air temperature of −30 °C, a 60-degree air heating in the intake manifold allows us to reduce the time spent to start the diesel engine from 43 to 22 s. With a further increase in the degree of heating, this time varies slightly. |
