Diesel engine cold start control system and method

Abstract

The invention discloses a diesel engine cold start control system and method. The system comprises a high-pressure gas holder, a detector, a storage device, and a controller; the high-pressure gas holder connected with an intake pip is capable of filling the intake pipe with gas; the detector is used for detecting diesel engine water temperature, ambient temperature and atmospheric pressure; the storage device is used for pre-storing a diesel engine water temperature set value, an ambient temperature set value and an atmospheric pressure set value. The controller is used for receiving a cold start signal; when judging the measured diesel engine water temperature, ambient temperature and atmospheric pressure are lower than the corresponding set values; the controller outputs a signal of opening the high-pressure gas holder, a signal of closing an outlet of an intercooler and a signal of opening an exhaust throttle valve under a preset opening; when judging cold start is finished, the controller outputs a signal of closing the high-pressure gas holder, a signal of opening the outlet of the intercooler and a signal of fully opening of the exhaust throttle valve. When the diesel engine is cold-started in a cold plateau area, the high-pressure gas holder is used to supply gas; intake for cold start of the diesel engine is increased, so that the rate of successfully cold-starting the diesel engine in the cold plateau area is increased.

Description

technical field [0001] The invention relates to the technical field of diesel engines, in particular to a cold start control system and method for diesel engines. Background technique [0002] The diesel engine inhales pure air during the intake stroke. When the compression stroke is near the end, the diesel is injected into the cylinder through the fuel injector and mixed with the compressed high-temperature air to form a combustible mixture. Due to the high compression ratio of the diesel engine, at the end of the compression stroke, the air pressure in the cylinder can reach 3.5-4.5MPa, and the temperature can reach 750-1000K at the same time, which is much higher than the self-ignition temperature of diesel. [0003] However, in the alpine region, as the altitude rises, the temperature drops and the air density drops, which leads to the low pressure and temperature at the compression end of the diesel engine at the starting speed, making it very difficult to start the di...

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Problems solved by technology

[0003] However, in the alpine region, as the altitude rises, the temperature drops and the air density drops, which leads to the low pressure and temperature at the compression end of the diesel engine at the starting speed, making it very difficult to start the diesel engine cold, resulting in a lot of energy waste and vehicle damage.

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