Auxiliary device for low-pressure and low-temperature starting of diesel engine

Abstract

The invention discloses an auxiliary device for low-pressure and low-temperature starting of a diesel engine. The auxiliary device comprises a fuel heater, a lithium ion storage battery module, a starter, a water inflow / return valve, a water temperature sensor and a control unit; the fuel heater is provided with a water outlet pipeline; the water outlet pipeline is provided with the water temperature sensor and a first water inflow / return valve and connected with the water inlet of an engine oil pan water jacket; the water outlet of the engine oil pan water jacket is connected with a water return pipeline; the water return pipeline is provided with a second water inflow / return valve and a water pump; the control unit is connected with the water temperature sensor; the lithium ion storage battery module, the starter and a motor are connected in sequence. The auxiliary device realizes hot starting of the diesel engine under low pressure and low temperature conditions, reduces the abrasion of the diesel engine during starting and prolongs the service life of the diesel engine.

Description

technical field [0001] The invention relates to the field of auxiliary equipment for diesel engines, in particular to a low-pressure and low-temperature start-up auxiliary device for diesel engines. Background technique [0002] The low-temperature starting performance of a diesel engine is one of the important performance indicators of a diesel engine. It is not only related to the working efficiency of the whole machine, but also affects its emission indicators, fuel consumption and service life. Due to the influence of dual factors (low air pressure and low temperature), the starting performance of the diesel engine is even worse under the plateau environmental conditions. In addition to optimizing the design of the diesel engine itself, the most important thing to improve the low-pressure and low-temperature starting performance of the diesel engine is to adopt low-temperature starting auxiliary measures. The fuel heater is a combustion heating device that works indepen...

AI Technical Summary

Problems solved by technology

Due to the high altitude (low atmospheric pressure), low oxygen content in the plateau area, large temperature difference between day and night, and long cold season, the intake air temperature and flow of the diesel engine will drop at the same time, causing the temperature and pressure at the compression end of the diesel engine cylinder to drop, resulting in Mixed gas and combustion conditions do not meet the ignition and continued combustion requirements of diesel engines

In addition, as the ambient temperature decreases, the output power of the battery also decreases accordingly (at -30°C, the rated output power decreases by about 60%), resulting in a decrease in the power of the starting system of the diesel engine, making the starting speed of the diesel engine lower than that necessary for starting. The minimum speed of

Due to the above reasons, the diesel engine cannot be started or cannot be started smoothly under the conditions of plateau (low air pressure, low temperature)

At present, domestic and foreign researchers have not reported the research on the combination of fuel heater and lithium-ion battery module to assist diesel engine cold start in plateau (low pressure, low temperature) environment.

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