CN211975218U

CN211975218U - Temperature-controllable exhaust gas recirculation device for internal combustion engine

Info

Publication number: CN211975218U
Application number: CN202020362288.8U
Authority: CN
Inventors: 李朝阳; 陆静安; 任红云; 吴志明; 张永涛; 吴昊
Original assignee: Shanghai Diesel Engine Co Ltd
Current assignee: Shanghai New Power Automotive Technology Co ltd
Priority date: 2020-03-20
Filing date: 2020-03-20
Publication date: 2020-11-20
Anticipated expiration: 2030-03-20

Abstract

The utility model discloses a temperature controllable internal combustion engine exhaust gas recirculation device, one end of an EGR outlet pipe (1) is communicated with one end of an EGR inlet pipe (2) through a cooler (6), the other end of the EGR outlet pipe is communicated with an inlet valve of an engine, and the other end of the EGR inlet pipe is communicated with an exhaust valve of the engine; the EGR bypass pipe (3) is communicated between the EGR outlet pipe and the EGR inlet pipe, a bypass pipe valve (4) is arranged in the EGR bypass pipe, and the bypass pipe valve is an electric control valve with controllable opening degree; the temperature sensor (5) is arranged at the downwind position of the communication position of the EGR outlet pipe and the EGR bypass pipe, and the bypass pipe valve is controlled by the temperature sensor through the control module. The device controls the air outlet of the EGR to be at a proper temperature point, so that the EGR can better match the actual requirement of the operation of the engine, the phenomena of water vapor condensation, even freezing and the like under a low-temperature environment are reduced, and the running performance of the engine is improved.

Description

Temperature-controllable exhaust gas recirculation device for internal combustion engine

Technical Field

The utility model relates to an internal-combustion engine exhaust gas recirculation device especially relates to a temperature controllable internal-combustion engine exhaust gas recirculation device.

Background

With the continuous development of internal combustion engine technology, Exhaust Gas recirculation technology, namely EGR technology (English abbreviation of Exhaust Gas Re-circulation, hereinafter referred to as EGR), is widely applied, especially EGR is applied to a gasoline engine to correspondingly increase air intake, and the increase of EGR rate can reduce the throttling loss of the gasoline engine under the working condition of medium and low load and reduce the fuel consumption rate of the gasoline engine.

The temperature of giving vent to anger has certain requirement in the EGR technique, and the too high EGR of temperature is given vent to anger and enter into the engine after, can increase the emission and the detonation risk of pollutant, and if the EGR is given vent to anger the low temperature, then can appear the phenomenon that steam condenses even freeze in EGR, then easily leads to engine combustion failure and trouble to take place, can't realize EGR and improve the effect of engine performance, consequently give vent to anger the temperature control of EGR in proper range then be the important a ring that promotes EGR technological effect. The existing temperature control mode is usually realized by controlling the cooling temperature of a cooling device, the reaction speed of the control mode is slow, the control process is complex, and the control effect of the EGR outlet gas temperature is poor.

Disclosure of Invention

An object of the utility model is to provide a temperature controllable internal-combustion engine exhaust gas recirculation device, the device is through adjusting the proportion that directly enters into gas in the EGR outlet duct by the EGR intake pipe to control EGR's giving vent to anger on suitable temperature point, so that EGR matches the actual requirement of engine function better, reduce the emergence of phenomenons such as steam condensation even freezing under the low temperature environment, promote the running performance of engine.

In order to realize the technical purpose, the utility model adopts the following technical scheme:

a temperature-controllable internal combustion engine waste gas recirculation device comprises an EGR (exhaust gas recirculation) outlet pipe, an EGR inlet pipe and a cooler, wherein one end of the EGR outlet pipe is communicated with one end of the EGR inlet pipe through the cooler, the other end of the EGR outlet pipe is communicated with an inlet valve of an engine, and the other end of the EGR inlet pipe is communicated with an exhaust valve of the engine; the device also comprises an EGR bypass pipe, wherein the EGR bypass pipe is communicated between the EGR outlet pipe and the EGR inlet pipe, a bypass pipe valve is arranged in the EGR bypass pipe, and the bypass pipe valve is an electric control valve with controllable opening degree; the device also comprises a temperature sensor, wherein the temperature sensor is arranged at the downwind position at the communication position of the EGR gas outlet pipe and the EGR bypass pipe; the device also comprises a control module, wherein the bypass pipe valve and the temperature sensor are electrically communicated with the control module, and the bypass pipe valve is controlled by the temperature sensor through the control module.

Further, the bypass pipe valve is a thermostat valve, and the control module is a thermostat.

The utility model discloses an in the device, temperature sensor real-time supervision EGR temperature of giving vent to anger, in control module, according to the operation conditions of engine and confirm a best EGR temperature of giving vent to anger to and obtain the current EGR temperature of giving vent to anger from temperature sensor, control module makes the contrast with two temperatures, then the aperture of control accent big or turn down the bypass valve, thereby adjust by the EGR intake pipe directly enter into the proportion of gas in the EGR outlet duct, realized giving vent to anger the control of temperature to EGR. The device of this embodiment is through controlling EGR's giving vent to anger on suitable temperature point position to make EGR match the actual requirement of engine operation better, reduce the emergence of the phenomenon such as steam condensation even freeze under the low temperature environment, promote the running performance of engine.

Drawings

Fig. 1 is the structure schematic diagram of the temperature controllable internal combustion engine exhaust gas recirculation device of the present invention, in which arrow a is the engine intake direction and arrow B is the engine exhaust direction.

In the figure: the system comprises a 1-EGR gas outlet pipe, a 2-EGR gas inlet pipe, a 3-EGR bypass pipe, a 4-bypass pipe valve, a 5-temperature sensor, a 6-cooler and a 7-coolant loop.

Detailed Description

The invention will be further described with reference to the following drawings and specific embodiments:

referring to fig. 1, a temperature-controllable exhaust gas recirculation device for an internal combustion engine comprises an EGR outlet pipe 1, an EGR inlet pipe 2, an EGR bypass pipe 3, a bypass pipe valve 4, a temperature sensor 5 and a cooler 6, wherein one end of the EGR outlet pipe 1 is communicated with one end of the EGR inlet pipe 2 through the cooler 6, a coolant loop 7 is arranged on one side of the cooler 6, the coolant loop 7 is connected with an external cooling device, the other end of the EGR outlet pipe 1 is communicated with an inlet valve of the engine, and the other end of the EGR inlet pipe 2 is communicated with an exhaust valve of the engine; the EGR bypass pipe 3 is communicated between the EGR outlet pipe 1 and the EGR inlet pipe 2, a bypass pipe valve 4 is arranged in the EGR bypass pipe 3, the bypass pipe valve 4 is an electric control valve with controllable opening degree, and the temperature sensor 5 is arranged at the downwind position at the communication position of the EGR outlet pipe 1 and the EGR bypass pipe 3; the device further comprises a control module (not shown in the figure), the bypass pipe valve 4 and the temperature sensor 5 are both electrically communicated with the control module, and the bypass pipe valve 4 is controlled by the temperature sensor 5 through the control module. More specifically, the bypass valve 4 is a thermostat valve and the control module is a thermostat.

Under the normal working state, the exhaust gas discharged by the engine enters the cooler 6 through the EGR gas inlet pipe 2, and the cooled gas returns to the engine through the EGR gas outlet pipe 1 to participate in work. The proportion of gas directly entering the EGR outlet pipe 1 from the EGR inlet pipe 2 through the EGR bypass pipe 3 can be adjusted by adjusting the opening degree of the bypass pipe valve 4, so that when the opening degree of the bypass pipe valve 4 is increased, more high-temperature gas which is not cooled by the cooler 6 in the EGR inlet pipe 2 directly enters the EGR outlet pipe 1, the temperature of gas entering the engine from the EGR outlet pipe 1 is improved, namely, the EGR gas outlet temperature is increased, when the opening degree of the bypass pipe valve 4 is reduced, more gas in the EGR inlet pipe 2 enters the EGR outlet pipe 1 after being cooled by the cooler 6, and the EGR gas outlet temperature is reduced. The temperature sensor 5 monitors the temperature of the gas entering the engine from the EGR outlet pipe 1 in real time, i.e., EGR gas outlet temperature, in which an optimum EGR gas outlet temperature is determined based on the operating conditions of the engine, on the one hand, and the current EGR gas outlet temperature is obtained from the temperature sensor 5 on the other hand, then comparing the two temperatures, if the current EGR outlet temperature is higher than the optimal EGR outlet temperature, the control module controls to reduce the opening degree of the bypass pipe valve 4, thereby increasing the proportion of gas in the EGR that is cooled by the cooler 6, thereby reducing the EGR gas temperature, if the current EGR outlet temperature is lower than the optimal EGR outlet temperature, the control module controls and increases the opening degree of the bypass pipe valve 4, therefore, the proportion of gas directly entering the EGR outlet pipe 1 from the EGR inlet pipe 2 is improved, and the EGR outlet temperature is improved. By the working process, the device of the embodiment realizes the control of the EGR outlet gas temperature. The device of the embodiment adjusts the proportion of the engine exhaust entering the EGR bypass pipe 3 and the cooler 6 by adjusting the opening degree of the bypass pipe valve 4 in the EGR bypass pipe 3, thereby controlling the EGR outlet gas to be at a proper temperature point, enabling the EGR to better match the actual requirement of the engine operation, reducing the occurrence of phenomena of vapor condensation, even freezing and the like under a low-temperature environment, and improving the running performance of the engine.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and should not be taken as limiting the scope of the present invention, therefore, any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims

1. A temperature-controllable internal combustion engine waste gas recirculation device comprises an EGR (exhaust gas recirculation) outlet pipe (1), an EGR inlet pipe (2) and a cooler (6), wherein one end of the EGR outlet pipe (1) is communicated with one end of the EGR inlet pipe (2) through the cooler (6), the other end of the EGR outlet pipe (1) is communicated with an inlet valve of an engine, and the other end of the EGR inlet pipe (2) is communicated with an exhaust valve of the engine;

the method is characterized in that: the device also comprises an EGR bypass pipe (3), wherein the EGR bypass pipe (3) is communicated between the EGR air outlet pipe (1) and the EGR air inlet pipe (2), a bypass pipe valve (4) is arranged in the EGR bypass pipe (3), and the bypass pipe valve (4) is an electric control valve with controllable opening degree; the device also comprises a temperature sensor (5), wherein the temperature sensor (5) is arranged at the downwind position at the communication position of the EGR gas outlet pipe (1) and the EGR bypass pipe (3); the device also comprises a control module, the bypass pipe valve (4) and the temperature sensor (5) are electrically communicated with the control module, and the bypass pipe valve (4) is controlled by the temperature sensor (5) through the control module.

2. The temperature-controllable exhaust gas recirculation apparatus for an internal combustion engine according to claim 1, wherein: the bypass pipe valve (4) is a thermostat valve, and the control module is a thermostat.