Cylinder cover with multi-loop cooling

Abstract

The invention provides a cylinder cover with multi-loop cooling. The cylinder cover comprises a partial air inlet pipeline, a cylinder cover body, a partial exhaust pipeline, an air inlet pipeline cooling water jacket, a cylinder cover lower cooling water jacket, a cylinder cover upper cooling water jacket and an exhaust pipeline cooling water jacket; the partial air inlet pipeline, the cylinder cover body and the partial exhaust pipeline are in an integrated structure; and a communicated water cavity is formed in the integrated structure. According to different running states of an engine, switching of a cooling loop is carried out as follows: when the engine is in the processes of starting and warming up, switching to the cooling loop is carried out, cooling liquid is heated by utilizingheat of gas and exhaust gas in an engine cylinder, so as to improve the starting process, shorten the warming-up time, reduce the fuel consumption and harmful exhaust emission when the engine is started and warmed up; and when the engine is in the process of high speed and heavy load working conditions, switching to the cooling loop is carried out, the temperatures of nose bridge areas of an intake valve and an exhaust valve of the cylinder cover is reduced, the reliability of weak parts of the cylinder cover is improved, the exhaust temperature of the exhaust pipeline is reduced, and an exhaust aftertreatment device is protected advantageously.

Description

technical field [0001] The invention belongs to the field of engines, in particular to a multi-circuit cooling cylinder head. Background technique [0002] During the cold start and warm-up process of the diesel engine, due to the increase of incomplete combustion and misfire cycle, a large amount of white smoke appears, which leads to the increase of HC emission; Higher, the mixture becomes richer, resulting in higher overall emissions from cold engine start than hot engine start; in the stable stage of cold start, because the fuel consumption is much greater than that of hot engine start, the NOx emission is also higher than that of hot engine start. According to the test calculation of the US Federal Test Regulation FTP-75, after the engine is started, about 80% of the HC and CO emissions of a gasoline engine equipped with a three-way catalytic converter are produced during the cold start stage. Therefore, it is necessary to effectively control the cold start emission of...

AI Technical Summary

Problems solved by technology

[0003] In view of this, the present invention aims to propose a multi-circuit cooling cylinder head to solve the problem of excessive harmful gas emissions during cold start and warm-up of the engine, high exhaust temperature at high speed and heavy load, and problems with the nose bridges of the intake and exhaust valves of the cylinder head. High temperature in the zone, stress concentration, prone to failure

Images