Abstract
Due to the conventional vehicles produce a lot of pollution and fuel consumption in driving. So the purpose of this study was to effectively improve emission and energy consumption, and kept the original vehicles in the better performance. Although pure electric vehicle had the good performance and low pollution features, the vehicle was limited by the distance, and the batteries were very expensive comparing to the conventional vehicle. The hybrid vehicles could achieve energy-saving purposes, but the prices of vehicles and the replaced batteries were still expensive than conventional vehicles. Hydraulic hybrid vehicles engines need to be accelerated with other dynamic alternate during work. And as the hydraulic accumulators exhausted, the accumulator would return to traditional mode. In the meantime, the engines will take the advantage of dynamic brake and pump energy recycles, and therefore fuel consumption and energy recovery function could be reached. In this study applied the feed-back simulation to establish hydraulic hybrid vehicle and hybrid electric vehicle models, and the NEDC (New European Driving cycle) was applied and simulated in this energy state. The simulation results showed the hydraulic hybrid vehicles had 56.7% better fuel economy efficiency than hybrid electric vehicles, this was the tremendous contribution on this study.
Highlights
General speaking, conventional manual or automatic transmission allowed the engine speed within a certain range, and the final drive output speed and torque to meet the driver's needs
Hydraulic transmission (HST) was widely used in the machine tool industry, construction machinery, construction machinery, vehicles, air transport [1], and its advantages could be listed as following: (1) Drive smoothly: the hydraulic drive unit, since the hydraulic oil shrinkage was very small, under normal pressure could be treated as incompressible, which was relied on a continuous flow of hydraulic oil carried drive, and the tubing hydraulic cushioning device can be designed and set in so that the transmission buffer was stable
Was applied reciprocating plunger in a limited volume movement, so after the inhalation of low pressure hydraulic fluid through the piston, and compressed volume of high-pressure hydraulic oil would be discharged through the piston
Summary
Conventional manual or automatic transmission allowed the engine speed within a certain range, and the final drive output speed and torque to meet the driver's needs. The biggest drawback was the need to rely on the transmission to shift gear when the gearbox changes gear, the engine speed will obviously feel increased or decreased, and feeling frustrated by the shift time is generated at this moment. Stepless transmission (CVT) does not produce the shift feeling frustrated during a shift, so that passengers could ride more comfortable vehicles. (3) Carrying capacity: the hydraulic drive was easy to get a lot of power and torque. (4) Easy to implement variable speed: In hydraulic transmission, regulate the flow of liquid could achieve stepless speed range up to 2000:1, and access to a very low speed Hydraulic transmission (HST) was widely used in the machine tool industry, construction machinery, construction machinery, vehicles, air transport [1], and its advantages could be listed as following: (1) Drive smoothly: the hydraulic drive unit, since the hydraulic oil shrinkage was very small, under normal pressure could be treated as incompressible, which was relied on a continuous flow of hydraulic oil carried drive, and the tubing hydraulic cushioning device can be designed and set in so that the transmission buffer was stable. (2) Light, small size: hydraulic transmission compared with the mechanical, electrical and other transmission mode in which the output power at the same conditions, the volume and quality could be reduce, so the inertia was small and the transmission reaction would be quick. (3) Carrying capacity: the hydraulic drive was easy to get a lot of power and torque. (4) Easy to implement variable speed: In hydraulic transmission, regulate the flow of liquid could achieve stepless speed range up to 2000:1, and access to a very low speed
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