Abstract
In recent decades, several types of hybrid vehicles have been developed in order to improve the fuel economy and to reduce the pollution. Hybrid electric vehicles (HEV) have shown a significant improvement in fuel efficiency for small and medium-sized passenger vehicles and SUVs. HEV has several limitations when applied to heavy vehicles; one is that larger vehicles demand more power, which requires significantly larger battery capacities. As an alternative solution, hydraulic hybrid technology has been found effective for heavy duty vehicle because of its high power density. The mechanical batteries used in hydraulic hybrid vehicles (HHV) can be charged and discharged remarkably faster than chemical batteries. This feature is essential for heavy vehicle hybridization. One of the main problems that should be solved for the successful commercialization of HHV is the excessive noise and vibration involving with the hydraulic systems. This study focuses on using magnetorheological (MR) technology to reduce the noise and vibration transmissibility from the hydraulic system to the vehicle body. In order to study the noise and vibration of HHV, a hydraulic hybrid subsystem in parallel design is analyzed. This research shows that the MR elements play an important role in reducing the transmitted noise and vibration to the vehicle body. Additionally, locations and orientations of the isolation system also affect the efficiency of the noise and vibration mitigation. In simulations, a skyhook control algorithm is used to achieve the highest possible effectiveness of the MR isolation system.
Highlights
Hybrid vehicles combine more than one source of energy for propulsion to achieve higher fuel efficiency and lower pollution
That the low force transmissibility occurs at both P/M and engine mounts proves the best compromise in vibration isolation from the hydraulic subsystem and the engine to the chassis
The nature of vibration problem involving with hydraulic hybrid vehicles was studied
Summary
Hybrid vehicles combine more than one source of energy for propulsion to achieve higher fuel efficiency and lower pollution. Various configurations exist for gasoline-electric hybrid vehicles, and the two main ones are series and parallel designs [16]. Hydraulic hybrid technology is suitable for heavy vehicles such as shuttle buses, refuse trucks, and delivery trucks where high power is needed to propel the vehicle and a large amount of energy is available for harvesting from braking. The hydraulic flow from HP-A back to LP-A makes the P/M work as a motor to transform the hydraulic energy to rotational motion at the wheels In this process, the engine only contributes to the vehicle propulsion when most of the stored hydraulic energy is used. The hydraulic energy is transformed into rotary motion by the second P/M This second P/M is connected to the high and low pressured accumulators. In a series HHV the engine can potentially operate at its optimal condition and/or be turned off leading to better fuel economy and less pollution
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