Influencing Factors of Electric Vehicle Economy Based on Continuously Variable Transmission

Fu, Bi; Zhu, Taiping; Liu, Jingang; Zhao, Yiming; Chen, Jianwen

doi:10.1007/s12239-022-0065-3

Cited by 4 publications

(4 citation statements)

References 19 publications

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“…The effectiveness of the control strategy for power matching of the tractor largely depends on the efficiency of transmission of the HMT. The load and efficiency of transmission of cars with CVT are relatively stable, and thus only the fuel consumption of the engine needs to be considered when developing control strategies for them [18][19][20]. By contrast, the efficiency of HMTs is significantly affected by fluctuating tractor loads.…”

Section: Introductionmentioning

confidence: 99%

Energy and Fuel Consumption of a New Concept of Hydro-Mechanical Tractor Transmission

et al. 2023

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Tractors equipped with hydro-mechanical transmissions (HMTs) typically deliver excellent fuel-saving performance but are expensive. To improve the fuel economy of cheaper tractors, the authors of this study have designed an HMT for a tractor that uses a simple, single planetary gear to merge the power and analyze its consumption of energy and fuel. First, we introduce the principle of transmission of the HMT and formulate a model to calculate its speed, torque, and efficiency. Second, we analyze the parasitic power of the HMT and simulate its characteristics of efficiency. Finally, we compare the efficiency of transmission and fuel consumption of HMTs with a single planetary gear and Simpson planetary gears. The results showed that parasitic power was obtained when the displacement of the variable pump was negative and the maximum ratio of hydrostatic power in each range was 45–46%. The highest efficiency of the proposed HMT in ranges RL (low range) and RH (high range) were 87% and 89%, respectively. It has a simpler structure than the HMT with Simpson planetary gears and consumes lower amounts of energy and fuel. These attributes make it suitable for use as a transmission system for large- and medium-power tractors with a continuously variable transmission.

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Section: Introductionmentioning

confidence: 99%

Energy and Fuel Consumption of a New Concept of Hydro-Mechanical Tractor Transmission

et al. 2023

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“…Additionally, by altering the transmission of an off-road heavy-duty vehicle, its efficiency can be increased. It is hypothesized that a CVT can be replaced by highly effective electric motors [17,[38][39][40][41][42][43][44][45][46][47], thus achieving similar transmission effectiveness while reducing the number of parts that cause mechanical losses. In this study, a power-splitting method for a series-hybrid system is investigated.…”

Section: Introductionmentioning

confidence: 99%

Application and Efficiency of a Series-Hybrid Drive for Agricultural Use Based on a Modified Version of the World Harmonized Transient Cycle

et al. 2023

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Off-road vehicles and transportation are vital for agricultural economics, yet the transition to green energies is challenging. To make this transition easier, a tool that enables the testing of heavy-duty off-road vehicles in various scenarios was created. Based on the methods of the World Harmonized Transient Cycle (WHTC), a new Hybrid Operational Cycle (HOC) that reflects the features of agricultural work was created and applied in a graphical model simulation. This was a newly developed methodology. The cycle and the model were based on gathered research data. A numerical model of a medium-power tractor with an internal combustion engine and a series-hybrid setup was created, and simulations were performed in Matlab and AVL Cruise. Both diesel and hybrid vehicles were compared in terms of their power production, fuel consumption, and efficiency in fieldwork and transportation scenarios. The results showed that a series-hybrid transmission can achieve an efficiency similar to that of a tractor with a continuously variable transmission (CVT), but because it uses an electric powertrain, it still provides the opportunity to exploit energy regeneration during transportation and under low-load conditions. The designed model may also be used to develop control algorithms for hybrid drives and improve their efficiency.

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“…The control system based on a fuzzy logic controller (FLC) detects the driver's intention according to the speed and gas pedal position signals. Fu proposed a continuous variable transmission (CVT) configuration based on an electric oil pump (EOP) for electric vehicles and constructed a dynamic model of electric vehicles equipped with CVT [9]. Liu et al designed a kind of two-speed AMT without a clutch and synchronizer, established the shift dynamics model and the shift-motor model, and controlled the motor and shift time, which reduced the power consumption [10].…”

Section: Introductionmentioning

confidence: 99%

Assessing the Dynamic Performance and Energy Efficiency of Pure Electric Car with Optimal Gear Shifting

Zhao,

Zhou,

Yue

et al. 2023

Energies

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Traditional pure electric cars generally adopt single-speed transmission for cost consideration. However, with the renewal and iteration of technology, small electric cars are all developed in the direction of power performance and environmental protection. Gear shifting makes it possible for the motor to work in a more efficient range, which possibly improves the performance of the entire powertrain. In this paper, a small electric car is designed, its power parameters are matched, and the energy-saving space and effect brought by adding multiple-gear shifting transmissions are discussed. To begin, the power-matching design was carried out, and then the transmission ratio was determined by particle swarm optimization. Finally, the power performance and fuel economy of this designed car equipped with different types of transmissions were analyzed and compared through simulation experiments. The results show that the electric car equipped with two-speed transmission has improvements in most important indicators, among which the acceleration time of 0 to 100 km/h is decreased by 17.7%, and the power consumption is reduced by 1.8%. To sum up, the feasibility of applying multiple-gear shifting to small electric cars is verified, and the experimental results provide a valuable reference for the development of electric cars.

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Influencing Factors of Electric Vehicle Economy Based on Continuously Variable Transmission

Cited by 4 publications

References 19 publications

Energy and Fuel Consumption of a New Concept of Hydro-Mechanical Tractor Transmission

Energy and Fuel Consumption of a New Concept of Hydro-Mechanical Tractor Transmission

Application and Efficiency of a Series-Hybrid Drive for Agricultural Use Based on a Modified Version of the World Harmonized Transient Cycle

Assessing the Dynamic Performance and Energy Efficiency of Pure Electric Car with Optimal Gear Shifting

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