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Hybrid Power for Mobile Systems
Published in Yatish T. Shah, Hybrid Power, 2021
Mild hybrid is a vehicle that cannot be driven solely on its electric motor, because the electric motor does not have enough power to propel the vehicle on its own. Mild hybrids include only some of the features found in hybrid technology, and usually achieve limited fuel consumption savings, up to 15 percent in urban driving and 8–10 percent overall cycle. A mild hybrid is essentially a conventional vehicle with oversize starter motor, allowing the engine to be turned off whenever the car is coasting, braking, or stopped; also the car can restart quickly and efficiently. The motor is often mounted between the engine and transmission, taking the place of the torque converter, and is used to supply additional propulsion energy when accelerating. Accessories can continue to run on electrical power while the gasoline engine is off, and as in other hybrid designs, the motor is used for regenerative braking to recapture energy. As compared to full hybrids, mild hybrids have smaller batteries and a smaller, weaker motor/generator, which allows manufacturers to reduce cost and weight.
Hybrid Electric Vehicles
Published in Richard E. Neapolitan, Kwang Hee Nam, AC Motor Control and Electrical Vehicle Applications, 2018
Richard E. Neapolitan, Kwang Hee Nam
ii) Mild Hybrid: An electric motor is incorporated in the drive train, but the ICE is a dominant power source. Mild hybrid systems provide important HEV features such as idle off, regenerative braking, and power assisting. Drive motor often replaces torque converter in conventional automatic transmission. However, the engine power split is imperfect and the efficiency gain is about 30%–50%. Honda ‘Civic Hybrid’ and Hyundai ‘Sonata Hybrid’ are typical mild hybrid vehicles.
Hybrid Electric Vehicles
Published in Kwang Hee Nam, and Electric Vehicle Applications, 2017
Mild Hybrid: An electric motor is incorporated in the power-train, but the ICE plays a dominant role. Mild hybrid systems offer major HEV functions such as idle off, regenerative braking, and power assisting. However, the engine power split is imperfect and fuel efficiency gain is about 50%−60%. Honda “Civic Hybrid” is a typical mild hybrid vehicle.
A novel state energy spatialization regenerative braking control strategy based on Q- learning algorithm for a super-mild hybrid electric vehicle
Published in International Journal of Green Energy, 2021
yanli yin, Liufeng Zhang, Sen Zhan, Yongjuan Ma, Shenpeng Ma
This paper adopts the regenerative braking energy optimization control strategy and researches on a super-mild hybrid electric vehicle (Frendo et al. 2020 ; Wu, Widanage, and Yang et al. 2020). In the regenerative braking control strategy, the battery state of charge (SOC) balance is vital for improving the fuel economy. Recently, most scholars maintain the battery balance through the SOC penalty function. Sen, Datong, and Yuping (2016) adopted the S-shaped penalty function to maintain the SOC balance, which is fitted by the quadric curve and quadric curve function. Xinyou and Dongye (2012) introduced PI penalty coefficients to control the range of SOC fluctuation. The literature (Renzong, Jiankun, and Yuankai et al. 2020; Teng, Wang, and Chenglang 2018) introduced a penalty function that takes the deviation between the actual and target SOC value as the constraint. Yonggang, Jun, and Datong et al. (2018) introduced the SOC correction factor into the objective function to make the actual SOC fluctuate within a small range. The above literature maintain the battery balance by the SOC penalty function in the time domain, which only realizes the instantaneous balance but ignores the global balance. In this paper, the state energy spatialization method is proposed to realize the global balance of battery energy.