Engine

Abstract

The invention provides an engine which comprises an engine combustion system, a cooling system and a water spraying system. The water spraying system is formed by sequentially connecting a water sprayer, a water pressure sensor, a solenoid valve, a water pump, a filter water tank, a water level sensor and a water injector through water pipes. The water spraying system further comprises a control system. The control system forms a closed-loop control loop through the water pressure sensor, the water level sensor, the solenoid valve, the water pump and an electronic control unit. According to feedback of the water pressure sensor, the water pumping pressure of the water pump is controlled through the electronic control unit, and therefore the water spraying pressure is changed; and the opening angle of the solenoid valve is controlled through the electronic control unit to control the water spraying amount. According to the engine, water enters a combustion chamber along with fresh air through the water spraying system, the in-cylinder combustion condition is improved, and the functions of reducing the temperature in the combustion chamber and restraining knocking are achieved.

Description

technical field [0001] The invention relates to the technical field of automobile safety equipment, in particular to a water spray system applied to a high compression ratio in-cylinder direct injection engine. Background technique [0002] Future gasoline engines need to provide users with high torque, high power and low cost products while meeting increasingly stringent fuel consumption and emission regulations. Improving the compression ratio, small supercharging combined with direct injection in the cylinder can improve the thermal efficiency of the engine and improve fuel economy. However, with the increase of the compression ratio and supercharging, the high temperature in the cylinder will cause knocking and even Super-knock will also make engine components run under extreme conditions, affecting the durability of components, thereby inhibiting the improvement of engine thermal efficiency. [0003] In order to suppress the knock caused by high compression ratio, smal...

AI Technical Summary

Problems solved by technology

Improving the compression ratio, small supercharging combined with direct injection in the cylinder can improve the thermal efficiency of the engine and improve fuel economy. However, with the increase of the compression ratio and supercharging, the high temperature in the cylinder will cause knocking and even Super-knock will also cause engine components to operate under extreme conditions, affecting the durability of components, thereby inhibiting the improvement of engine thermal efficiency

[0003] In order to suppress the knock caused by high compression ratio, small supercharging and direct injection in cylinder, waste recirculation (EGR) system, variable compression ratio, Miller cycle and water injection technology can be adopted, but EGR technology, engine parts The change is large, and with the increase of EGR concentration, the oxygen concentration in the cylinder mixture decreases, which makes it difficult to ignite the cylinder mixture; the application cost of variable compression ratio is high, and the number of motion pairs increases, so that the friction work Increased height; the Miller cycle will affect the tumble flow of the intake air, and the return flow of the intake air will increase the difficulty of supercharger control; compared with other technologies, the water spray technology has the advantages of simple control and strong practicability in working conditions

Patent CN201110234776.6 proposes a water injection system for the engine intake pipe, which can control the amount of water mixed in the engine combustion chamber. The intake pipe is far away from the combustion chamber, and it is easy to form water droplets and does not solve the hidden danger of freezing in extremely cold ambient temperatures. method, and the quality of spray water cannot be guaranteed

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