Engine cooling system and temperature control method of cooling liquid thereof

Abstract

The invention discloses an engine cooling system and a temperature control method of cooling liquid thereof. The engine cooling system comprises a heat radiator, a water pump, a circulating water jacket, an electronic thermostat, a cooling fan, a cooling liquid temperature sensor and an engine control unit, wherein the control unit determines the cooling liquid target temperature of an engine under the current operation working condition according to acquired signals, such as engine rotating speed, load, speed, air inlet temperature, and the like and ensures that the engine works under the optimal cooling liquid temperature condition by controlling the heating time of the electronic thermostat and the high and low speed running of the cooling fan.

Description

technical field [0001] The invention belongs to the field of automobile engine cooling systems, and in particular relates to an engine cooling system and a cooling liquid temperature control method. Background technique [0002] The traditional engine cooling system controls the temperature of the engine coolant through the mechanical thermostat. Before the coolant reaches a certain temperature, the mechanical thermostat is closed, cutting off the passage to the radiator (big cycle), and from the engine outlet to the bypass (HVAC) The channels of water pipes, electronic throttle heating water pipes, CNG pressure reducer heating water pipes, etc.) are opened, and the coolant flows directly back to the engine without cooling (small cycle); the mechanical thermostat opens at a certain temperature (such as 88°C), The mixed coolant cooled by the radiator (large circulation) and uncooled (small circulation) enters the engine to control the temperature of the engine coolant. If th...

AI Technical Summary

Problems solved by technology

The traditional engine coolant temperature control system cannot make the engine work under the optimum temperature conditions in all working conditions

At the same time, since there is only one coolant target temperature control, in order to meet the requirements of the entire engine operating condition, the coolant target temperature will be set relatively low (such as 90°C), which will cause the cooling fan to be turned on frequently, increasing power consumption and Noise affects vehicle fuel consumption and vehicle comfort

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