High/low-temperature cooling system of dual-cycle engine

Abstract

The invention discloses a high / low-temperature cooling system of a dual-cycle engine. The system comprises high-temperature and low-temperature water circulating cooling systems. The high-temperaturesystem is selectively opened or closed through a temperature adjuster and an electromagnetic valve to switch the flowing direction of cooling water according to engine loads so as to realize quick machine warming and reduction of the oil consumption. A cylinder cover and a cylinder block water jacket are maintained in serial connection in the cold starting phase of an engine, so that twice heatingis performed in one cycle of the cooling water to accelerate heating of the cooling water to the greatest extent. In the machine warming and high-temperature phase with higher engine temperature, thecylinder cover and the cylinder block water jacket are maintained in parallel connection to increase the water flow of the engine to the greatest extent; and respective water flows of a cylinder block and the cylinder cover can be controlled to achieve optimal temperature so as to reduce the knocking and the oil consumption. The low-temperature cycle system adopts an electronic water pump and a common water storage kettle; and a throttling hole is formed between the water storage kettle and the low-temperature system, so that the arrangement space and cost are reduced, the influence on the low-temperature system by the high-temperature system is reduced as far as possible, the intake temperature and the intake efficiency of the engine are effectively guaranteed, the dynamic property of the engine is exerted, and the knocking is prevented.

Description

technical field [0001] The invention belongs to the technical field of automobile engines, and in particular relates to an engine high and low temperature cooling system. Background technique [0002] Engine warm-up refers to the process in which the temperature of the engine body rises from low temperature to normal operating temperature. When the engine is cold started, due to the low temperature of the intake system and the cylinder, it is difficult for gasoline to evaporate completely, resulting in incomplete combustion and a large amount of C and H emissions; at the same time, due to the difficulty of fuel evaporation and poor combustion conditions, additional fuel consumption is increased . In addition, during the warm-up process, the temperature of the cooling water is low, and the heat taken away by the water from the engine increases, which increases the heat loss. When the engine starts cold, the temperature is low, the internal moving parts of the engine have gr...

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Problems solved by technology

[0003] For the traditional supercharged engine, it uses an air-cooled system, because the pipeline is too long, there is a delay, and it will be affected by the speed of the vehicle, so it cannot maintain the best cooling effect under any working conditions

Moreover, the supercharger cooler responsible for cooling the supercharger bearings is arranged in a high-temperature system. After the engine is stopped, the main water pump of the engine is not running, which may easily cause insufficient cooling of the bearings.

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