Tianjin University

Gequn Shu

Haiqiao Wei

Lei Zhou

Zongkuan Liu

Hua Tian

Peng Liu

Lijia Zhong

Lei Wang

Jianxiong Hua

Qiang Gao

Guobin Ma

Jiaying Pan

Lingfeng Shi

Guangdai Huang

Xiaoya Li

Xuan Wang

Zhigang Yu

Changwen Liu

Jiaqiang Che

An ammonia-rich combustion coupled dual-mode prechamber ammonia-fueled engine control system is provided, including an ammonia-fueled engine and an electronic control unit. The ammonia-fueled engine includes a combustion chamber, a dual-mode jet ignition device, and an ammonia injector. The dual-mode jet ignition device includes a prechamber, an air injector, and a fuel injector. When the engine operates, ammonia fuel is firstly injected into the combustion chamber by the ammonia injector to form a rich ammonia-air mixture with air in the combustion chamber. During a compression stroke of the engine, the rich ammonia-air mixture in the combustion chamber is entered into the prechamber through a jet hole. The air injector performs scavenging in the prechamber until a equivalence ratio of prechamber gas mixture is less than 1.0, and then the fuel injector injects fuel into the prechamber forming target mixture. Finally, the target mixture is ignited by the spark plug.

Ammonia-rich combustion coupled dual-mode prechamber ammonia-fueled engine control system

A multi-stage flame acceleration device and method for a gas-fuel engine are provided. The device includes a pressing piece, an upper chamber, a spark plug, a fuel ejector, a cooling device, and a flame acceleration nozzle. The spark plug and the fuel ejector are mounted in the upper chamber. The pressing piece is sleeved on an upper part of the upper chamber, and the device is wholly and fixedly connected to a cylinder head through a step groove of the upper chamber. A nozzle sealing ring, the flame acceleration nozzle, and a cylinder head sealing ring are mounted at a bottom of the upper chamber from top to bottom in sequence. Annular obstacles formed by annular plates are arranged in a chamber of the flame acceleration nozzle. In the method, a fuel is ejected in the chamber of the flame acceleration nozzle to obtain a homogeneous gas mixture.

Multi-stage flame acceleration device and method for gas-fuel engine

Disclosed is a multiple combustion mode engine with ammonia fuel including an cylinder head, a cylinder sleeve, a piston, a main combustion chamber, an inlet valve and an exhaust valve, and further including a jet ignition device arranged on the cylinder head and used for providing an ignition source for the main combustion chamber, and an ammonia injector used for providing ammonia/air mixture gas for the main combustion chamber. Also disclosed is a control method of the multiple combustion mode engine with ammonia fuel. The time sequence of ammonia injection of the main combustion chamber and jet flame generation of the pre-chamber is controlled, the mixed state of the fuel/air in the main combustion chamber before ignition can be controlled, and finally different combustion modes, i.e. a premixed combustion mode and a diffusion combustion mode, are formed in the main combustion chamber.

Multiple combustion mode engine with ammonia fuel and control method thereof

The present invention discloses a three-component mixed working fluid for an ICE waste heat recovery power cycle, wherein the three-component mixed working fluid consists of carbon dioxide, pentane and a refrigerant, the refrigerant is a high-performance environment-friendly refrigerant with GWP value which is lower than 1000 and ODP value which is 0, and the refrigerant is one selected from a group consisting of difluoromethane, fluoroethane and 1,1-difluoroethane; according to the selected refrigerants, the mass percentage of each component is as follow: the mass percentage of CO, pentane and difluoromethane are 30-70, 10-20, and 10-60; the mass percentage of CO, pentane and fluoroethane are 30-70/10-20/10-50; the mass percentage of CO, pentane and 1,1-difluoroethane are 10-70/10-30/10-60. The present invention has good environmental performance, safety performance and thermodynamic performance, and the thermal efficiency is higher than 12% of prior art; and the present invention further has good ability of synergistically recovering waste heat of engine coolant and gas, thus reaching 100% utilization rate of engine coolant, and more than 60% utilization rate of gas. The critical temperature of the three-component mixture is obviously higher than that of CO, the cooling conditions of the system are relaxed, and the conditions for the waste heat recovery system for vehicles are satisfied.

Three-component mixed working fluid for internal combustion engine waste heat recovery power cycle

An electromagnetic braking system and control method, with the system having a CCU, a braking cylinder, a push rod, an electromagnetic braking ring, an electromagnetic braking piston fixed to the push rod, a first shading plate and a second shading plate, a photoelectric sensor fixed near the push rod, and an electromagnetic braking control circuit, and the control method including following the steps: initial estimating of the braking distance (l) according to the current magnitude, electromagnetic force between the two electromagnetic coils and initial velocity (v) of the push rod, arranging a restoration distance (&#x394;l) between the top dead center and the piston after braking, installing two shading plates and the photoelectric sensor; and setting the distance between the two electromagnetic coils to when the starts braking.

Electromagnetic braking system and control method for rapid compression machine

Single expander device working with two working media in a two-stage organic Rankine cycle, which has a cylinder body, a rotor disposed inside the cylinder body and provided with a number of slip sheets in a radial direction of the cylinder body, and a rotary shaft fixedly connected to the center of the rotor, with the outer profile of the cylinder body defined by two mathematical equations.

Double-working-medium expander used for two-stage organic Rankine cycle

A multi-energy-form output energy tower for stepwise recovering waste heat of a gas engine, comprising an internal combustion engine (), wherein the present invention also comprises a steam Rankine cycle system () which is capable of heat exchanging with the high temperature exhaust exhausted from the IC engine () to make the steam turbine () do expansion work. An organic Rankine cycle system which is respectively heat exchanged with high temperature exhaust, jacket water and charge air which are exhausted from the IC engine (), and with condensation heat in the steam Rankine cycle system () to do expansion work; a lithium bromide refrigerator () which uses jacket waterpart of jacket water discharged from the IC engine () as a heat source of the absorption cooling system for heat exchange; and a hot water heat exchanger () connected with a high temperature exhaust of the IC engine () for heating domestic water. The energy tower of the present invention adopts multiple waste heat recovering methods and combines cooling, heating and power supplying methods, which improves comprehensive energy utilization efficiency of the system and achieves the effects of energy saving and emission reduction.

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Tianjin, China

Gequn Shu