Wideband dual-polarized slot-coupled microstrip array for synthetic aperture radar application

et al. 2013

AMR

A starting experiment has been conducted to investigate the effect of ignition timing on the starting characteristics for linear engine designed by the research group independently. The fuel injection pulse and ignition timing are controlled by the electronic control unit (ECU) which is developed based on the piston displacement. The combustion characteristics of the engine in starting process are studied based on the cylinder pressure measured by the transient pressure sensor. The result shows that the best ignition timing for linear engine starting is 2.4mm~2.8mm when the fuel injection pulse is 5.4ms and this best region of ignition timing is also meet the requirement of the combustion in the next several cycles.

Section: Introductionmentioning

confidence: 99%

Effect of Ignition Timing on the Starting Characteristics for Linear Engine

et al. 2013

AMR

“…Linear engine-alternator system is one of the solutions of hybrid electric vehicles [1], which has received more and more concerns because of its unique features, including optimized combustion due to variable compression ratio, high load efficiency and possible multi-fuel operation etc [2][3][4][5][6][7]. Among all of the characteristics, the greatest one is elimination of the crankshaft mechanism.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ignition Timing and Excess Air Ratio on Combustion Characteristic of Linear Engine

Sun

et al. 2013

AMR

Based on the linear engine prototype designed by the studying team, the combustion characteristic of the linear engine in certain revolution is investigated experimentally. The effect of ignition timing and excess air ratio on combustion characteristic of the linear engine is studied based on cycle-by-cycle control technique. The result shows that the ignition timing has effect on the combustion characteristic of linear engines in certain revolution. Advancing the ignition timing from 1.0mm BTDC (before the top dead center) to 3.0mm BTDC, the peak cylinder pressure increases, the interval between peak cylinder pressure timing and the top dead center reduces, the IMEP (indicated mean effective pressure) is down, the instantaneous heat release rises and the total heat release decreases. The excess air ratio has apparently effect on combustion characteristic of linear engines in certain revolution. Reducing the excess air ratio from 1.45 to 1.35, the peak cylinder pressure increases, the peak cylinder pressure timing is closer to the top dead center, the instantaneous heat release and the total heat release are larger.

Section: Introductionmentioning

confidence: 99%

Research on the Starting Characteristics of the Linear Engine System Using the Eccentric-Slider Starting System

et al. 2013

AMM

A unique linear engine system is designed independently using eccentric-slider starting system which has been simulated and optimized. Based on the linear engine prototype, the no-load experiment and normal starting experiment are conducted in order to validate the practicality of the eccentric-slider starting system and research the starting characteristics of the linear engine system. The results show that the linear engine can operate smoothly with the starting system under the control logic based on piston displacement and engine frequency. Meanwhile the top cylinder pressure is 1.0MPa in compression process and the engine speed increase continuously with the peak combustion cylinder pressure above 2.0MPa in the normal starting experiment.