To investigate the dynamic characteristics and damping theory of the passive hydraulic engine mount （PHEM）, numerical prediction is performed through lumped parameter model. System parameters, including volume compl...To investigate the dynamic characteristics and damping theory of the passive hydraulic engine mount （PHEM）, numerical prediction is performed through lumped parameter model. System parameters, including volume compliance of the decoupler chamber, effective piston area, fluid inertia and resistance of inertia track and direct-decoupler, are identified by means of experiments and finite element method （FEM）. Dynamic behaviors are tested with elastomer test system for purpose of validating PHEM. With incorporation of inertia track and direct-decoupler, PHEM behaves effective and efficient vibration isolation in range of both low and high frequencies. The comparison of the numerical results with the experimental observations shows that the present PHEM achieves fairly good performance for the engine vibration isolation.展开更多
A speed control analysis for an in-line gasoline fueled internal combustion(IC)engine is presented for the purpose of alleviation of high frequency oscillations in engine revolutions.A dynamic cylinder-by-cylinder mod...A speed control analysis for an in-line gasoline fueled internal combustion(IC)engine is presented for the purpose of alleviation of high frequency oscillations in engine revolutions.A dynamic cylinder-by-cylinder model is proposed,base on slider-crank mechanism,which is extended to develop a digital governor providing a high fidelity estimation of rotary speed oscillation for hybrid vehicle engines.A modified PID controller that P and I gain is placed in feedback path is also described for hybrid electric vehicle(HEV)engine speed regulation,By comparison between measured and estimated signals,it is demonstrated that a good agreement has been achieved and the governor behaves an excellent damping speed ripple.展开更多
基金National Hi-tech Research Development Program of China(863 Program,No.2001AA505000-11)
文摘To investigate the dynamic characteristics and damping theory of the passive hydraulic engine mount （PHEM）, numerical prediction is performed through lumped parameter model. System parameters, including volume compliance of the decoupler chamber, effective piston area, fluid inertia and resistance of inertia track and direct-decoupler, are identified by means of experiments and finite element method （FEM）. Dynamic behaviors are tested with elastomer test system for purpose of validating PHEM. With incorporation of inertia track and direct-decoupler, PHEM behaves effective and efficient vibration isolation in range of both low and high frequencies. The comparison of the numerical results with the experimental observations shows that the present PHEM achieves fairly good performance for the engine vibration isolation.
基金supported by National Hi-tech Research and Development Program of China(863 Program,No.2001AA501211).
文摘A speed control analysis for an in-line gasoline fueled internal combustion(IC)engine is presented for the purpose of alleviation of high frequency oscillations in engine revolutions.A dynamic cylinder-by-cylinder model is proposed,base on slider-crank mechanism,which is extended to develop a digital governor providing a high fidelity estimation of rotary speed oscillation for hybrid vehicle engines.A modified PID controller that P and I gain is placed in feedback path is also described for hybrid electric vehicle(HEV)engine speed regulation,By comparison between measured and estimated signals,it is demonstrated that a good agreement has been achieved and the governor behaves an excellent damping speed ripple.
