Calibration method, device and equipment for pilot injection opening angle and storage medium

Abstract

The invention relates to the technical field of engine calibration, in particular to a calibration method and device for a pilot injection opening angle, equipment and a storage medium. The method is used for reasonably setting the pilot injection opening angle of an engine and improving the low-temperature starting performance of the engine and comprises the steps that after it is determined that the operation mode of the engine is a starting mode and a rail pressure instantaneous value is not smaller than a rail pressure threshold value, a corresponding cylinder interior working medium temperature instantaneous value is obtained based on a cylinder pressure instantaneous value collected by a cylinder pressure sensor; when it is determined that a crank angle instantaneous value collected by a crank sensor is located in a preset crank angle interval and a working medium temperature instantaneous value in a cylinder reaches a working medium temperature threshold value, the crank angle instantaneous value at the moment is determined as a pilot injection opening angle calibration value corresponding to the starting mode; in this way, the temperature of the working medium in the cylinder can be increased through heat released by the cold flame reaction, so that fuel oil rapidly reaches the spontaneous combustion temperature of the fuel oil to be ignited and combusted, the starting time of the engine is shortened, and the low-temperature starting performance of the engine is improved.

Description

technical field [0001] The present application relates to the technical field of engine calibration, and in particular, to a method, device, device and storage medium for calibrating a pre-injection opening angle. Background technique [0002] The low temperature starting ability of an engine is an important index to evaluate the performance of an engine. However, the pre-injection opening angle of the traditional engine is usually determined by empirical data. However, in the extreme low temperature environment, after the fuel is injected into the cylinder at the pre-injection opening angle determined based on the empirical data, due to the low temperature of the engine cylinder wall, it cannot be The expected effect of heating the fuel to form a mixture may even prolong the start-up time of the engine. Therefore, the reasonable setting of the pre-injection opening angle of the engine is of great significance to improve the low-temperature start-up capability of the engine....

AI Technical Summary

Problems solved by technology

However, the pre-injection opening angle of traditional engines is usually formulated using empirical data. However, in extremely low-temperature environments, after the fuel is injected into the cylinder at the pre-injection opening angle based on empirical data, the engine cylinder wall temperature is very low. The expected effect of heating the fuel to form a mixture may even prolong the starting time of the engine. Therefore, setting the opening angle of the engine's pre-injection reasonably is of great significance to improve the low-temperature starting ability of the engine.

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