Abstract
In order to reduce the oil consumption, the vehicle in the process of in-situ shift should be quick enough, but the vibration and shock of the vehicle will be deteriorate. Then the effect of a novel semi-active hydraulic damping strut (HDS) on vehicle shock and vibration in the process of in-situ shift quickly in this study is analyzed. Firstly, the shift shock is analyzed from the driver system, and the powertrain mounting system (PMS) is regarded as the object to be optimized in this study. Then the 13 degree of freedoms (DOFs) vehicle dynamic model (VDM) with semi-active HDS is presented in this paper. The excitation force in the process of quick in-situ shift is identified, and the evaluation indexes (EIs) are reduced with semi-active HDS introduced. Finally, the experiments are carried out to validate the effect of the semi-active HDS on vehicle longitudinal vibration and shock in the process of quick in-situ shift, and the results show that the acceleration of the seat rail and steering wheel are reduced to a great extent. Different shift time is discussed and the results show that we can reduce the shift time to save the oil with semi-active HDS introduced.
Highlights
The control of the oil consumption in vehicles is significant for conserving energy and reducing emission
In order to evaluate the dynamic response of the vehicle in the process of in-situ shift, the following evaluation indexes are proposed: Shift time
(1) A novel semi-active hydraulic damping strut (HDS) is taken in the powertrain mounting system (PMS) to reduce the vehicle in-situ shift quickly based on the discussion of the shift shock from the vehicle driver system
Summary
The control of the oil consumption in vehicles is significant for conserving energy and reducing emission. In order to reduce engine fuel consumption, the engine start and in-situ shift process should be quick enough for traditional fuel vehicle. The vibration and shock of the vehicle will be deteriorate if the in-situ shift time is reduced. Reducing the in-situ shift time without destroy the vehicle noise, vibration and harshness (NVH) performance is essential and meaningful. There are two methods to reduce the shift shock and vibration: (1) take the optimal control algorithm to make the shift smoothly; (2) design and optimize the PMS. The compensation control or optimization control strategy often depends on the precision of the control system on transient conditions.[1]
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