阅读说明：本技术 一种高效egr引入混合系统 (High-efficient EGR introduces hybrid system ) 是由 赖钧明 吴世友 刘爽 赵伟 李达 于 2019-11-28 设计创作，主要内容包括：本发明是一种高效EGR引入混合系统。其控制逻辑为：整车工况输入ECU,ECU调整进气节气门和EGR阀开度,文丘里管传感器和进气温度压力传感器向ECU发送数据,计算EGR混合模型,ECU信号输入执行器,上滑块上下运动,调整预热器喉口通道。当需要高废气流引入时,通过减少预热器喉口通道,加强文丘里吸入效应,同时空气气流进一步加速撞击废气气流,保证混合均匀性。当需要低废气流引入时,通过增加预热器喉口通道,降低空气阻力,提高性能。该方法通过对混合器智能控制,实现EGR引入混合系统智能控制,实现进气阻力、EGR率及EGR混合均匀性的兼顾,有效提高机器热效率。同时功能模块化,接口简捷,互换性高,适配不同机器。(The invention relates to a high-efficiency EGR introduction mixing system. The control logic is as follows: the working condition of the whole vehicle is input into an ECU, the ECU adjusts the opening degree of an air inlet throttle valve and an EGR valve, a Venturi tube sensor and an air inlet temperature pressure sensor send data to the ECU, an EGR mixed model is calculated, ECU signals are input into an actuator, an upper sliding block moves up and down, and a throat opening channel of a preheater is adjusted. When high waste gas flow is required to be introduced, the venturi suction effect is enhanced by reducing the throat channel of the preheater, and meanwhile, the air flow is further accelerated to impact the waste gas flow, so that the mixing uniformity is ensured. When low exhaust gas flow is required to be introduced, the air resistance is reduced and the performance is improved by increasing the throat channel of the preheater. According to the method, the intelligent control of the mixer is realized, the intelligent control of the EGR introduced into a mixing system is realized, the consideration of air inlet resistance, EGR rate and EGR mixing uniformity is realized, and the heat efficiency of the machine is effectively improved. Meanwhile, the function is modularized, the interface is simple and convenient, the interchangeability is high, and the device is suitable for different machines.)

1. A high-efficiency EGR introduction hybrid system is characterized by comprising an EGR valve (1), a Wenquill pipe sensor (2), an air intake throttle valve (3), a mixer (4), an air intake temperature and pressure sensor (5) and an ECU (6); the EGR valve (1) is connected with the Wenquill pipe sensor (2); the venturi tube sensor (2) and the air intake throttle valve (3) are connected with the mixer (4); the mixer (4) is connected with an air inlet temperature and pressure sensor (5); and the ECU (6) is connected with the EGR valve (1), the Wenquill pipe sensor (2), the mixer (4) and the air inlet temperature and pressure sensor (5).

2. The high-efficiency EGR introduction hybrid system according to claim 1, characterized in that the mixer (4) comprises a front intake adapter (7), a rear intake adapter (8), an embedded intake preheater (9), an actuator (10), a conduit oil seal (11), a connecting pin (12) and an EGR exhaust conduit (13); wherein the front air inlet connecting pipe (7) and the rear air inlet connecting pipe (8) are combined into a pipeline; the embedded air inlet preheater (9) is arranged on the air inlet connecting pipe (7); the actuator (10) is arranged on the front air connecting pipe (7); the EGR waste gas guide pipe (13) is arranged on the rear intake connecting pipe (8); the embedded air inlet preheater (9) comprises a frame (14), a diaphragm type heating fin (15) and an upper sliding block (16); the membrane type heating fin (15) is elastic, the lower side of the membrane type heating fin is fixed on the frame (14) through a first mica sheet (17), and the upper book is fixed on the upper sliding block (16) through a second mica sheet (18); the conduit oil seal (11) is arranged on the air inlet connecting pipe (7) and sleeved on the upper sliding block (16); the connecting pin (12) connects the actuator (10) and the upper slide (16).

Technical Field

The invention belongs to the technical field of automobiles, and particularly relates to a high-efficiency EGR introduction hybrid system.

Background

The legislation is increasingly demanding on engine exhaust emissions, and NOx, as the main pollutant in vehicle exhaust emissions, is mainly controlled by EGR systems. Wherein for a multi-cylinder engine, the EGR rate of each cylinder is not uniform and the design requirement of the combustion system can not be met due to the limitation of the arrangement of the intake manifold. The market demand for power of the engine is increasing day by day, the engine displacement is further promoted, and higher EGR rate and EGR mixing efficiency are required. Meanwhile, the economical efficiency of the engine is improved by intelligently controlling the EGR hybrid system.

At present, the common technical scheme for solving the uniformity of each cylinder of EGR is to insert an EGR gas guide pipe into an air inlet connecting pipe, and the scheme has the defects that the gas of an inserted pipeline is not easy to diffuse, the introduced waste gas is mainly mixed at the air flow boundary, the concentration of the air flow center of the waste gas is very high, and the EGR mixing efficiency is low. In order to solve the problem that exhaust gas is agglomerated and is not suitable for diffusion, the existing patent mainly improves the guide pipe and gives priority to uniformly distributed round holes, the EGR guide pipe with the defects of the scheme has a complex structure and increases the EGR circulation resistance, and when the working condition of low rotating speed and large load is caused, the EGR rate is low, and the combustion performance in the cylinder is influenced.

Patent document (CN202900451U) discloses an EGR mixer for an EGR engine, wherein a throat is arranged in an inner cavity of the mixer, which is opposite to an exhaust gas inlet channel, the throat is a tubular throat with a thin middle part and thick two ends, and exhaust gas inlets are uniformly arranged on a pipe wall of the throat along an air inlet direction in an inclined manner. This application has utilized venturi structure's suction effect to improve the EGR rate, for solving EGR rate homogeneity, it uses equipartition round hole cast outer frame, forms the vortex, mixes in air current periphery. In order to form a vortex, the waste gas inlet hole structure is obliquely arranged, and the process is relatively complex. Meanwhile, the mixing structure lacks of a turbulent flow structure, mixing is only carried out at the periphery of the air flow, the air flow center is poor in mixing, and the EGR mixing capacity is poor.

Disclosure of Invention

The invention provides a high-efficiency EGR introduction mixing system, which solves the problems of low engine efficiency caused by uneven mixing of the existing EGR and high EGR circulation resistance and low EGR rate of an insertion scheme.

The patent technical scheme of the invention is described as follows by combining the attached drawings:

a high-efficiency EGR introduction hybrid system including an EGR valve 1, a venturi sensor 2, an intake throttle valve 3, a mixer 4, an intake temperature pressure sensor 5, and an ECU 6; the EGR valve 1 is connected with the Wenquill pipe sensor 2; the venturi tube sensor 2 and the air intake throttle valve 3 are connected with the mixer 4; the mixer 4 is connected with an air inlet temperature and pressure sensor 5; the ECU6 is connected to the EGR valve 1, the venturi sensor 2, the mixer 4, and the intake air temperature pressure sensor 5.

The mixer 4 comprises a front air inlet connecting pipe 7, a rear air inlet connecting pipe 8, an embedded air inlet preheater 9, an actuator 10, a guide pipe oil seal 11, a connecting pin 12 and an EGR waste gas guide pipe 13; wherein, the front air inlet connecting pipe 7 and the rear air inlet connecting pipe 8 are combined into a pipeline; the embedded air inlet preheater 9 is arranged on the air inlet connecting pipe 7; the actuator 10 is arranged on the front air inlet connecting pipe 7; the EGR waste gas conduit 13 is arranged on the rear air inlet connecting pipe 8; the embedded type air inlet preheater 9 comprises a frame 14, a diaphragm type heating fin 15 and an upper sliding block 16; the diaphragm type heating fin 15 has elasticity, the lower side of the diaphragm type heating fin is fixed on the frame 14 through a first mica sheet 17, and the upper side of the diaphragm type heating fin is fixed on the upper sliding block 16 through a second mica sheet 18; the conduit oil seal 11 is arranged on the front air inlet connecting pipe 7 and sleeved on the upper sliding block 16; the connecting pin 12 connects the actuator 10 and the upper slide 16.

The beneficial effects of the invention are as follows:

according to the method, the intelligent control of the mixer is realized, the intelligent control of the EGR introduced into a mixing system is realized, the consideration of air inlet resistance, EGR rate and EGR mixing uniformity is realized, and the heat efficiency of the machine is effectively improved. Meanwhile, the function is modularized, the interface is simple and convenient, the interchangeability is high, and the device is suitable for different machines.

Drawings

FIG. 1 is a schematic diagram of the operation of the present invention;

FIG. 2 is a schematic view of a mixer according to the present invention;

FIG. 3 is a schematic diagram of an embedded inlet preheater according to the present invention;

FIG. 4 is a system flow of the present invention;

1. an EGR valve; 2. a venturi tube sensor; 3. an intake throttle valve; 4. a mixer; 5. an intake air temperature pressure sensor; 6. an ECU; 7. an air inlet pipe; 8. a rear air inlet connecting pipe; 9. an embedded intake preheater; 10. an actuator; 11. conduit oil seal; 12. a connecting pin; 13. an EGR exhaust conduit 13; 14. a frame; 15. a diaphragm type heating fin; 16. an upper slide block assembly; 17. a first mica sheet; 18. a second mica sheet.

Detailed Description

Referring to fig. 1, a high efficiency EGR introduction hybrid system includes an EGR valve 1, a venturi sensor 2, an intake throttle valve 3, a mixer 4, an intake temperature and pressure sensor 5, an ECU6, and the like.

Wherein the EGR valve 1 is controlled by the ECU6, the primary function being to control exhaust gas flow. The venturi sensor 2 functions primarily to measure exhaust gas flow while sending data to the ECU 6. The intake throttle valve 3 is controlled by the ECU6, and its main function is to control the air flow rate. The mixer 4 is controlled by the ECU6 and its main function is to mix air and exhaust gases. The intake air temperature pressure sensor 5 mainly functions to measure the mixture air pressure temperature while sending data to the ECU 6. The ECU6 is an engine control unit and has the function of receiving signals of the venturi sensor 2 and the intake temperature and pressure sensor 5 and controlling the mixer 4 to work according to logic so as to ensure that the EGR rate meets the working condition requirement.

Referring to fig. 2 and 3, the mixer 4 is composed of a front intake pipe 7, a rear intake pipe 8, an embedded intake preheater 9, an actuator 10, a conduit oil seal 11, a connecting pin 12, and an EGR exhaust gas conduit 13. The front air inlet connecting pipe 7 and the rear air inlet connecting pipe 8 are combined into a pipeline, the embedded air inlet preheater 9 is installed on the front air inlet connecting pipe 7, the actuator 10 is installed on the front air inlet connecting pipe 7, and the EGR waste gas guide pipe 13 is installed on the rear air inlet connecting pipe 8. The embedded intake preheater 10 is composed of a frame 14, a diaphragm type heating fin 15 and an upper slide block 16. The diaphragm type heating fin 15 has certain elasticity, the lower side of the diaphragm type heating fin is fixed on the frame 14 through a first mica sheet 17, and the upper side of the diaphragm type heating fin is fixed on the upper sliding block 16 through a second mica sheet 18. The above structures are assembled to form the mixer 4. The conduit oil seal 11 is arranged on the front air inlet pipe 7 and sleeved on the upper sliding block 16 to realize the sealing function. The connecting pin 12 connects the actuator 10 and the upper slide 16, and the actuator 10 controls the upper slide 16. The air flows through the front air intake adapter 7 and through the air intake preheater 9, at this time, the air intake section is reduced due to the air intake preheater frame 14, the venturi effect is generated, the air speed is increased, the pressure is reduced, and the low-pressure area is generated at the rear end of the preheater. The EGR waste gas is led in through an EGR waste gas guide pipe 13, and at the moment, the EGR waste gas is effectively sucked due to the low-pressure adsorption effect at the rear end of the air inlet preheater 9, so that the EGR charging efficiency is improved. Meanwhile, air is disturbed and accelerated through the heating fins 15, and the waste gas is impacted to quickly break up the flow of the waste gas, so that the waste gas is mixed with the air in a large range, the EGR mixing efficiency is improved, and the uniformity of each cylinder is ensured.

Referring to fig. 4, the control logic is: the working condition of the whole vehicle is input into an ECU, the ECU adjusts the opening degree of an air inlet throttle valve and an EGR valve, a Venturi tube sensor and an air inlet temperature pressure sensor send data to the ECU, an EGR mixed model is calculated, ECU signals are input into an actuator, an upper sliding block moves up and down, and a throat opening channel of a preheater is adjusted. When high waste gas flow is required to be introduced, the venturi suction effect is enhanced by reducing the throat channel of the preheater, and meanwhile, the air flow is further accelerated to impact the waste gas flow, so that the mixing uniformity is ensured. When low exhaust gas flow is required to be introduced, the air resistance is reduced and the performance is improved by increasing the throat channel of the preheater.

According to the method, the intelligent control of the mixer is realized, the intelligent control of the EGR introduced into a mixing system is realized, the consideration of air inlet resistance, EGR rate and EGR mixing uniformity is realized, and the heat efficiency of the machine is effectively improved. Meanwhile, the function is modularized, the interface is simple and convenient, the interchangeability is high, and the device is suitable for different machines.