EGR valve with heating water cavity and heating method

Abstract

The invention discloses an EGR valve with a heating water cavity and relates to EGR valves. The technical problem that an existing EGR valve is likely to be frozen in severe cold regions is mainly solved. The EGR valve with the heating water cavity comprises a valve body, and further comprises a shell wrapping the valve body. The heating water cavity is formed in a clearance between the valve bodyand the shell, and a water inlet and a water outlet communicating with the heating water cavity are formed in the shell. The invention further discloses a heating method of the EGR valve with the heating water cavity. According to the EGR valve with the heating water cavity and the heating method, cooling water of an engine is introduced into the heating water cavity, the cooling water is circulated between the heating water cavity and the engine to heat the valve body, and the problem that the EGR valve is frozen in the severe cold regions can be effectively solved.

Description

technical field [0001] The invention relates to an EGR valve, more specifically, it relates to an EGR valve with a heating water cavity and a heating method. Background technique [0002] EGR (Exhaust Gas Recirculation System) technology is one of the main technologies of engine development, that is, a small part of exhaust gas generated by the engine is sent back to the cylinder to participate in combustion. The main component of exhaust gas, CO2, can slow down the combustion speed in the cylinder and reduce the temperature, not only improves engine reliability, but also reduces the formation of nitrogen oxides. And on ignition engines, the knock boundary can also be widened, and the ignition advance angle can be appropriately increased to reduce specific gas / fuel consumption and improve economy. [0003] The EGR valve is an important main component of the EGR system. At present, there are mainly bridge EGR valves and CAN valves on the market. They play a key role in preci...

AI Technical Summary

Problems solved by technology

[0003] The EGR valve is an important main component of the EGR system. At present, there are mainly bridge EGR valves and CAN valves on the market. They play a key role in precisely controlling the EGR rate. Too high or too low an EGR rate will have adverse effects on the engine. , When the EGR rate is too low, the engine cylinder and exhaust temperature are high, which will shorten the service life of the engine. When the EGR rate is too high, the engine is prone to misfire and poor operation

[0004] Since EGR exhaust gas contains water vapor, in severe cold regions (temperature ≤ 0°C), when the engine is running under a small load condition with EGR rate, due to the small exhaust gas flow rate, less heat and faster heat dissipation, the moisture in the exhaust gas is easily combined with EGR The valve is frozen together, so that the EGR valve is not controlled by command; when the engine stops working, the residual moisture on and around the EGR valve and the valve freeze, and the engine is run again, and the EGR valve is not controlled

Images