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：US20220261655A1

公开(公告)日：2022-08-18

申请号：US17674762

申请日：2022-02-17

Applicant: Tianjin University

Inventor： Haifeng LIU ,  Xiaoteng ZHANG ,  Can WANG ,  Mingfa YAO

IPC: G06N3/08 ,  G06N3/04 ,  G06K9/62 ,  G01M15/10

Abstract: A real-time prediction method for an engine emission is provided, including: acquiring multiple known historical test data samples for engine emission, dividing the samples into a training set and a test set to train multiple neural network (NN), calculating mean square errors (MSEs) output by each of the NNs with the different numbers of hidden layer nodes to determine a topological structure of the NNs, optimizing initial weights and initial thresholds for each of the NNs with a mind evolutionary algorithm (MEA), and establishing a real-time engine emission prediction system with an Adaboost algorithm. The present disclosure overcomes problems that the existing engine emission data acquisition method is time-consuming and labor-consuming, restricted by environmental factors, expensive in instrument cost and undesirable in transient emission measurement performance; and only by simply measuring a rotational speed a torque, a power, a rail pressure, an air-fuel ratio, an oil consumption, an exhaust gas recirculation (EGR) rate and a start of injection (SOI) in operation of the engine, the present disclosure can accurately predict the transient nitrogen oxide (NOx) emission, total hydro carbon (THC) emission and carbon monoxide (CO) emission of the engine in real time.

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：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.