Experimental study of electric vehicle gearbox efficiency

Břoušek, Josef; Zvolský, Tomáš

doi:10.1051/matecconf/201823402004

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…The overall efficiency of an EV involves the efficiency of the battery, the power converter and the output of the electric motor, and the efficiency of the gearbox [21,22]. Figure 1 demonstrates the overall efficiency of the EV propulsion system and the efficiency equation is expressed in Equation (4).…”

Section: Overall Efficiencymentioning

confidence: 99%

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Optimizing Energy Harvesting: A Gain-Scheduled Braking System for Electric Vehicles with Enhanced State of Charge and Efficiency

et al. 2023

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Recycling braking energy is crucial in increasing the overall energy efficiency of an electric vehicle. Regenerative braking system (RBS) technology makes a significant contribution, but it is quite challenging to design an optimal braking force distribution while ensuring vehicle stability and battery health. In this study, a parallel-distribution braking system that transfers as much energy as possible from the wheel to the battery was investigated. An integrated braking force distribution with gain-scheduling super-twisting sliding mode control (GSTSMC) was proposed to capture the maximum kinetic energy during braking and convert it into electrical energy. Parallel friction and regenerative braking ratios dominate the design of the braking component, which is based on the speed of the vehicle. A GSTSMC was implemented and incorporated into the vehicle dynamics model developed in the ADVISOR environment. Simulation was utilized to rigorously validate the efficacy of the proposed control strategy, ensuring its potential to perform optimally in practical applications. Consideration was given to the vehicle’s slip ratio on dry asphalt to maintain vehicle stability. Simulation results were used to validate the performance of the proposed design in terms of the state of charge (SOC), transmitted energy, motor efficiency, battery temperature, and slip ratio. Based on the results, the proposed control strategy is capable of increasing the SOC value to 54%, overall efficiency to 25.98%, energy transmitted to 14.27%, and energy loss to 87 kJ while considering the vehicle’s speed-tracking ability, battery temperature, and stability.

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Section: Overall Efficiencymentioning

confidence: 99%

“…Figure 1 demonstrates the overall efficiency of the EV propulsion system and the efficiency equation is expressed in Equation (4). Individual components of the EV propulsion system's efficiency [22].…”

Section: Overall Efficiencymentioning

confidence: 99%

Optimizing Energy Harvesting: A Gain-Scheduled Braking System for Electric Vehicles with Enhanced State of Charge and Efficiency

et al. 2023

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“…This difference is mainly due to the low efficiency of diesel technology, which has significant heat losses that should be dissipated to the environment by radiators. Although in Chapter 4 the dynamic model of the gearbox was not considered due to its complexity, the gearbox efficiency for electric drivetrains ranges between 90% to 98% [28]. On the other hand, the electric LHD presents much greater energy efficiency, higher than 80%, if the power converter and motor efficiencies are combined.…”

Section: Evaluation Of Electric Lhd Modelmentioning

confidence: 99%

Electro-Mechanical Modeling and Evaluation of Electric Load Haul Dump Based on Field Measurements

et al. 2023

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In underground mining, conventional loader equipment uses diesel as a power source, implying different drawbacks, such as combustion gases, low visibility, worker’s health problems, and high ventilation requirements. Thus, hybrid and electric loaders are being developed by the main industry suppliers who prefer clean technology. In this study, we analyzed the performance of an electro-mechanical powertrain through a dynamic model of underground-loader equipment using field data. This electric LHD model was compared to a diesel loader under the same operational conditions. For the case study, the results showed that the proposed electro-mechanical model, considering 14 tons of capacity, consumed 86.8 kWh, representing 60.5% less energy than the diesel loader with similar speed and torque characteristics. Thus, the proposed methodology is a valuable tool for operators, process engineers, and decision-makers, allowing an energy-efficiency evaluation for electric LHD adoption, based on the current operational data available for conventional equipment.

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“…Based on typical BLDC motor efficiency range of 85% to 90% [4], η M = 85%  η T ≡ Mechanical Transmission System efficiency. Considering a typical Transmission efficiencies range of 86% to 98% [5], η T = 92%.  η G ≡ DC generator efficiency.…”

Section: Ls Motor (Options 1 and 2) Required Input Power Vs The Bldc Motor To Maintain The Same Outputmentioning

confidence: 99%

For Propulsion Applications It Is Possible to Utilize Both the Torque Output of the Rotor and the Reactional Torque Acting on the Stator of the Driving Electric Motor by Linearizing the Stator

Abunaieb¹

2021

EPE

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This paper presents a novel idea of utilizing the reactional torque of the conventional electric motor as a linear output for propulsion in addition to the conventional torque output of the rotor. The idea is demonstrated by a theoretical proposal of linearizing the stator of one of the most used motors in Electrical Vehicles and Hybrid Vehicles. The proposed Linear Stator Motor is a simple modification without involving any functional change of the conventional motor. Though theoretical, the indicated possible input energy saving of more than 75% as compared to the conventional motor is no surprise, as by linearizing the stator, an almost equal linear propulsion output is added to the conventional rotor output. In addition to this remarkable saving in input energy, the proposed Linear Stator Motor that suits all types of vehicles, can maintain propulsion without the need for a mechanical transmission system. Also, in the case of watercraft and aircraft vehicles, no external mechanical propulsion drive system is required. It is just an internal force that can push the vehicle forward, backward, or laterally, while the conventional rotor output can be utilized for energy recovery by driving a DC generator.

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Experimental study of electric vehicle gearbox efficiency

Cited by 7 publications

References 9 publications

Optimizing Energy Harvesting: A Gain-Scheduled Braking System for Electric Vehicles with Enhanced State of Charge and Efficiency

Optimizing Energy Harvesting: A Gain-Scheduled Braking System for Electric Vehicles with Enhanced State of Charge and Efficiency

Electro-Mechanical Modeling and Evaluation of Electric Load Haul Dump Based on Field Measurements

For Propulsion Applications It Is Possible to Utilize Both the Torque Output of the Rotor and the Reactional Torque Acting on the Stator of the Driving Electric Motor by Linearizing the Stator

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