Diesel engine cooling system for construction machinery and control method of diesel engine cooling system

Abstract

The invention discloses a diesel engine cooling system for construction machinery and a control method of the diesel engine cooling system. The cooling system comprises coolers, a cooling water incoming pipe and a cooling water outgoing pipe, wherein the cooling water incoming pipe is connected with water inlets of the coolers, and the cooling water outgoing pipe is connected with water outlets of the coolers; the cooling system further comprises a heat accumulator and an electric control adjusting valve; two ends of the heat accumulator are connected with the cooling water incoming pipe and the cooling water outgoing pipe respectively and are in parallel connection with the coolers; the electric control adjusting valve is arranged on a branch of the heat accumulator. The cooling system responds in a timely, reliable and controlled manner, and a diesel engine has no overheating risks; a refrigerant can be heated by the heat accumulator when the diesel engine is started, so that the diesel engine is warmed quickly, and cold machine running abrasion is reduced.

Description

technical field [0001] The invention relates to the technical field of engineering machinery, in particular to a diesel engine cooling system for engineering machinery and a control method thereof. Background technique [0002] When the diesel engine is running at part load, especially at low and medium speed part load, the heat load is low, and the surface temperature of the parts in the cylinder is in a low state. At this time, the throttling control device of the coolant circulation works to maintain a certain coolant temperature. [0003] When the diesel engine is fueled to increase the output, it takes a certain time to respond to the increase of the return water temperature and the sensitivity of the sensor action, the opening of the water circulation throttle valve will have a lagging response. However, the radiator cooling fan is coupled with the diesel engine shaft through a hydraulic clutch, and the heat transfer process from the ambient air to the radiator wall, ...

AI Technical Summary

Problems solved by technology

However, it leads to: the heat transfer temperature difference of the radiator is reduced, and more heat transfer units are required, which means that the energy consumption of the cooling fan increases and the consumption of materials; the average heat dissipation of the diesel engine increases, the thermal efficiency decreases, and the fuel consumption increases; due to the large heat dissipation The number of units is designed, when the speed response of the diesel engine increases, the throttle valve will reduce the opening again, and the cooling power of the fan will be wasted

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