Cooling control system of diesel engine, and method thereof

Abstract

The invention discloses a cooling control system of a diesel engine, and a method thereof, wherein two high-low temperature heat exchangers are arranged; a sea water pump adjusts total yield of cooled water through frequency control; flow adjusting valves are respectively arranged at sea water inlets of two high-low temperature heat exchangers to adjust supply quantity of sea water; a high-low temperature heat exchanger provides cooled water to an intercooler; pressurized air is cooled to lower than 60 degrees through the intercooler; the other one high-low temperature heat exchanger is divided into two paths which are respectively used for cooling a machine body and feeding water for a lubricating oil cooler; in the system, an air outlet of the intercooler is provided with a temperature sensor; a temperature sensor is arranged on the machine body; a temperature sensor is arranged at an oil outlet of the lubricating oil cooler; and water outlets of two high-low temperature heat exchangers are respectively provided with temperature sensors. According to the invention, temperature at each point is detected, and is compared with set temperature, and flow at various inlets is controlled through a frequency converter and the flow adjusting valve by using a flow adjusting formula and a control model.

Description

technical field [0001] The invention belongs to the technical field of mechatronics, and relates to a diesel engine cooling control system and method for intelligently collecting and distributing the diesel engine body, intake air and lubricating oil. Background technique [0002] The thermal state of the diesel engine is not only an important basis for the design of the diesel engine, but also an important factor in the design of the cooling system of the ship's engine room. The heat of diesel fuel combustion is partially converted into effective work (about 40%), and the rest is taken away by cooling medium (about 30%), exhaust gas (about 30%), etc. Valves, cylinder walls, cylinder liners, pistons and cylinder heads that are in direct contact with high-temperature gases will experience rapid temperature rises. However, the temperature range for parts to work reliably is limited. Insufficient cooling will lead to a decrease in the inflation coefficient, abnormal combustion...

AI Technical Summary

Problems solved by technology

Although thermostat valves and other measures are adopted to ensure the outlet water temperature, under small and medium loads, the amount of cooling water is too large, and the diesel engine is prone to overcooling problems.

On the one hand, excessive cooling takes away too much heat from the combustion of the diesel engine, resulting in a decrease in output power and an increase in fuel consumption; on the other hand, it leads to an increase in the power consumption of the water pump and an increase in the loss power of the auxiliary system

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