Automobile engine cooling system and its control method

Abstract

The invention discloses an automobile engine cooling system. The automobile engine cooling system comprises a cylinder block water jacket, a cylinder cover water jacket and a radiator, wherein a wateroutlet of the radiator is connected to a water inlet of the cylinder block water jacket and a water inlet end of an engine oil cooling branch through a water pump correspondingly, the water outlet ofthe cylinder block water jacket is connected to a water inlet of the cylinder cover water jacket, a water inlet end of an EGR cooling branch and a water inlet end of a supercharger cooling branch correspondingly, and a water outlet of the cylinder cover water jacket is connected to a return water port of the cylinder block water jacket and a water inlet end of a cooling liquid supplementing branch; a first water inlet is connected with a water outlet end of the EGR cooling branch, a second water inlet is connected with a water outlet end of the engine oil cooling branch, the first water outlet is connected with a water inlet of the water pump, and a second water outlet is connected with a water inlet of the radiator; the invention further provides a control method based on the automobileengine cooling system, the control method comprises four working modes of a shutdown mode, a warming mode, low-load operation and high-load operation. According to the system and the method, the timeof warming is greatly shortened, the control response time is short, and the water temperature is prevented from being greatly fluctuated.

Description

technical field [0001] The invention relates to the technical field of automobile cooling systems, in particular to an automobile engine cooling system and a control method thereof. Background technique [0002] Rapidly raising the engine water temperature to achieve rapid temperature rise of the cylinder block, cylinder head and engine oil not only helps to reduce engine friction and fuel consumption, but also helps reduce the risk of oil dilution. The traditional engine uses a thermostat to control the circulation loop, and the valves are linked by a mechanical structure, and only one cycle can be closed at the same time; and due to the physical properties of the paraffin inside the thermostat, the volume expansion after heating makes the thermostat fully open for a long time, even if An electric heating element is added inside the thermostat to promote the temperature rise of the paraffin, but the thermostat is still fully open for a long time, and it is impossible to qui...

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Problems solved by technology

[0003] Chinese patent CN105257383A discloses an engine cooling system. After the engine is cold-started, the thermostat turns off the large cycle but opens the small cycle when the temperature is low. The coolant in the engine is always in a circulating state, and the heat generated by the combustion chamber If it is taken away by the coolant, the temperature of the cylinder block and cylinder head will rise slowly; when the engine load changes suddenly, the thermostat cannot quickly switch between large and small cycles, which will easily cause large fluctuations in the engine water temperature, and even the water temperature exceeds the engine limit

In the patent CN105257383A, the coolant in the expansion tank and the warm air heat exchanger is always involved in the circulation during warm-up, which has an adverse effect on shortening the warm-up time

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