Tianjin University

Yang Wang

Mingfa Yao

Hu Wang

Haifeng Liu

Zunqing Zheng

Lixia Wei

Tao Zhu

Xiao Wei Zhang

Fang He

Zhong Zhang

Shuaiqing Xu

Shan Mi

Qian Xiong

Guorui Jia

Qingyun Tian

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.

Control method of variable stroke engine for reforming high-octane fuel under the flexible cylinder engine (FCE) mode

The present invention discloses a novel engine controlled by combustion reaction path, which cylinders comprise working cylinders and reforming cylinders. According to the operational condition of engine, the engine is used for compressing, heating and reforming the fuel injected from the reforming cylinder injector; by controlling the reaction boundary conditions between fuel and air, the reforming cylinder can exhaust partial intermediate products or oxidation products of the different oxidation stages; the products are then mixes with the inlet air in the pre-mixing chamber and then is introduced into the working cylinder. Under operating in different working conditions, the engine can discharge the mixed gas with different activities under different oxidation stages by regulating the corresponding boundary conditions of the reforming reaction of the reforming cylinder, and can achieve concentration stratification and activity stratification of the mixed gas in the working cylinder by using the fuel injected from the working cylinder injectors, and can effectively achieve high effectiveness and broaden the scope of clean combustion by changing the combustion reaction path. The present invention just adopts simple oxidation reaction post-treatment device, and then the emission of the engine can meet the requirement of EuroVI emission regulation.

Engine controlled by combustion reaction path and regulating method thereof

The present invention discloses a novel low-temperature fuel reforming unit based on combined external reformer of an engine, comprising an engine cylinder and an external low-temperature fuel reformer; the external low-temperature fuel reformer is winded with a heater strip and is provided with a first temperature controlled meter, the inlet of the external low-temperature fuel reformer is connected with a air inlet pipe and a fuel sample injection pipe, and a flow meter is arranged on the air inlet pipe; the fuel sample injection pipe is connected with a fuel injection pump and a fuel vaporization tank which is provided with a second temperature controlled meter; the outlet of the external low-temperature fuel reformer is connected with the engine inlet pipe via a reforming gas pipe; and the reformed low-temperature products enter into the engine inlet pipe via the reforming gas pipe for combining with the fresh air again to form a uniform hybrid gas, and the hybrid gas is introduced into the engine cylinder and performing combined combustion with the fuel in the cylinder to achieve activity and concentration stratification of hybrid gas. Since the above process does not need adding catalyst, the engine of the present invention can be operated more efficient and energy-saving.

Low-temperature fuel reforming unit based on combined external reformer of an engine

A common rail electronic control injection system which uses a DME or a low-viscosity fuel similar with DME to inject into a combustion engine, includes a fuel container, a common rail tube, a high-pressure tube, an electronic control injector, an electronic control unit, a high-pressure pump, a working medium case, a reversing component, and a pressure convertor, wherein the pressure convertor includes at least two working components, each working component is divided into a fuel chamber and a working medium chamber by an dividing element, the dividing element can freely deform or move between the fuel chamber and the working medium chamber by pressure effect. The invention avoids the sealing and abrasion problem in the plunger matching portions which is caused by the low-viscosity fuel so as to greatly improve the lifetime and reliability of system.

Electronic control common rail DME injection system

Growing community of inventors

Tianjin, China

Yang Wang