公开(公告)号：US20210123388A1

公开(公告)日：2021-04-29

申请号：US17078360

申请日：2020-10-23

Applicant: Tianjin University

Inventor： Haifeng LIU ,  Can WANG ,  Mingchao LIU ,  Mingfa YAO ,  Zunqing ZHENG ,  Hu WANG

IPC: F02D41/00 ,  F02M35/10 ,  F02M35/024 ,  F02M35/104 ,  F01N11/00 ,  F01N3/10 ,  F02D41/14 ,  F02C3/02

Abstract: The present disclosure discloses an intake oxygen concentration control system suitable for an engine with lean NOx trapping technology. The system adopts an exhaust turbocharging device to provide a pressure difference for an oxygen-enriched membrane to generate oxygen-rich and oxygen-deficient gases, and controls the intake oxygen concentration of different cylinders by adjusting the opening of flow control valves to match lean and rich combustion cycles of a lean NOx trapping system. In a lean combustion cycle, all four cylinders are filled with an oxygen-rich gas, which can make the combustion more complete and improve the thermal efficiency and fuel economy. In a rich combustion cycle, one of the four cylinders is filled with an oxygen-deficient gas, and the other three cylinders are filled with air or an oxygen-rich gas with a low concentration, so that less fuel is required to create a reducing atmosphere to realize the release and reduction of NOx in a lean NOx trapping device, thereby reducing the fuel consumption and ensuring the output power of the other three cylinders.

公开(公告)号：US20210332302A1

公开(公告)日：2021-10-28

申请号：US16322116

申请日：2018-03-28

Applicant: Tianjin University

Inventor： Haifeng LIU ,  Guixiang MA ,  Junsheng MA ,  Mingfa YAO ,  Zunqing ZHENG ,  Hu WANG

IPC: C10L1/02 ,  C10L1/08 ,  C10L10/12

Abstract: The present invention a mixed fuel suitable for diesel engines, which consists of the following components by volume percentage: 35% to 37.5% of diesel, 35% to 37.5% of ethanol and 25% to 30% of PODE, wherein the diesel is petroleum diesel having a cetane number not less than 48; the purity of the ethanol by mass percentage is not less than 99.5%; and, the PODE is a mixture of two fuels shown by molecular formulae CH3O(CH2O)3CH3 and CH3O(CH2O)4CH3. The use of this fuel is advantageous for emission reduction.

公开(公告)号：US20150377197A1

公开(公告)日：2015-12-31

申请号：US14235081

申请日：2013-09-17

Applicant: TIANJIN UNIVERSITY

Inventor： Mingfa YAO ,  Yongzhi LI ,  Zunqing ZHENG ,  Laihui TONG ,  Xiangyu ZHANG

IPC: F02M51/06

CPC classification number: F02M51/0603 ,  F02D19/0694 ,  F02M21/0248 ,  F02M43/04 ,  F02M45/086 ,  F02M2200/46 ,  F02M2200/703 ,  Y02T10/36

Abstract: The invention discloses a dual-channel piezoelectric injector, including a dual-channel injector body, its bottom in turn is connected with an upper intermediate, a lower intermediate and a dual-channel needle valve body. At the top of the dual-channel injector body there are two tubing interfaces, and each tubing interface has a tubing fuel duct. There are two laminated piezoelectric actuators and two spray fuel ducts connected to two tubing fuel ducts respectively inside the dual-channel injector body. The upper intermediate and lower intermediate connected with each other to form the middle connection body. From top to bottom of the middle connection body, there is an external control fuel duct, an external spray fuel duct, an internal control fuel duct and internal fuel spray duct. Inside the double-channel needle valve body, there is the sleeve structure of the needle valve hole, at the bottom of double-channel needle valve body there is an internal fuel spray nozzle connecting the internal casing hole which is outside the body, and an external fuel spray nozzle connecting to the external casing hole which is outside the body. Through the two laminated type piezoelectric actuators, control is realized for the pressure difference between the fuel pressure of the fuel control cavity and the fuel pressure of the inner pressure chamber or outer pressure chamber. So it is also realized to control the open or close state of the internal or external needle valve, in turn to control the injection action of the internal fuel spray nozzle or external fuel spray nozzle. The present invention has a simple structure and a low manufacturing cost.

Abstract translation: 本发明公开了一种双通道压电注射器，包括双通道注射器主体，其底部依次与上中间体，下中间体和双通道针阀体连接。 在双通道喷射器主体的顶部有两个油管接口，每个油管接口都有管道燃油管道。 两个层压压电致动器和两个喷射燃料管道分别连接到双通道喷射器主体内的两个燃油管道。 上部中间和下部中间相互连接形成中间连接体。 从中间连接体的顶部到底部，有外部控制燃料管道，外部喷射燃料管道，内部控制燃料管道和内部燃料喷射管道。 在双通道针阀体内部，有针阀孔的套筒结构，在双通道针阀体的底部有一个内部燃料喷嘴，连接机体外部的内壳孔， 外部燃料喷嘴连接到外部外壳外壳孔。 通过这两个层压型压电致动器，实现燃料控制腔的燃料压力与内部压力室或外部压力室的燃料压力之间的压力差的控制。 因此，也可以实现控制内部或外部针阀的打开或关闭状态，从而控制内部燃料喷嘴或外部燃料喷嘴的喷射动作。 本发明的结构简单，制造成本低。

公开(公告)号：US20210277842A1

公开(公告)日：2021-09-09

申请号：US16346538

申请日：2018-03-29

Applicant: Tianjin University

Inventor： Haifeng LIU ,  Junsheng MA ,  Guixiang MA ,  Zihan HE ,  Mingfa YAO ,  Zunqing ZHENG ,  Hu WANG

IPC: F02D41/06 ,  F02D41/00 ,  F02N19/04

Abstract: The present invention discloses a cold start operation device and control method for a diesel engine in a plateau region under a low ambient temperature, allowing a starter to drive a piston to compress the low-temperature air, by using the heated air as the fresh inlet air to introduce it into the cylinder, so that the in-cylinder temperature at the compressing TDC is increased to obtain the ignition temperature, and finally achieving the cold start of diesel engines in plateau regions. The present invention avoids complicated preheating devices, and has simple structure and reliable performance, can achieve effective cold start in different low ambient temperature environments.

公开(公告)号：US20210095604A1

公开(公告)日：2021-04-01

申请号：US16301721

申请日：2018-03-23

Applicant: TIANJIN UNIVERSITY

Inventor： Mingfa YAO ,  Yang WANG ,  Hu WANG ,  Haifeng LIU ,  Zunqing ZHENG ,  Shan MI

IPC: F02D15/02 ,  F02B75/04 ,  F02M35/10 ,  F02M31/20 ,  F02D41/38 ,  F02B75/02 ,  F02D13/02

Abstract: The present invention discloses a control method of variable stroke engine for reforming high-octane fuel under the FCE mode, the ECU connected to the engine controls the amount of fuel injected from the flexible cylinder injector to the flexible cylinder and controls the switch state of inlet valve and exhaust valve of the flexible cylinder, so that the flexible cylinder can be switched between two-stroke mode and four-stroke mode according to the actual engine operating conditions; when the engine is at a small load and needs to promote combustion stability, the flexible cylinder injector injects a rich fuel with equivalence ratio greater than 1 into the flexible cylinder, the flexible cylinder is at two-stroke mode; when the engine is at a large load and needs sufficient power output, the flexible cylinder injector injects a conventional fuel into the flexible cylinder, said flexible cylinder is at four-stroke mode.