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Research on Braking Safety of Parallel Hybrid Electric Buses on Long Downhill based on Gradient and Speed Change Wuhan University of Technology
- Format:
- Book
- Conference/Event
- Author/Creator:
- Huang, Xin, author.
- Conference Name:
- SAE WCX Digital Summit (2021-04-13 : Live Online, Pennsylvania, United States)
- Language:
- English
- Physical Description:
- 1 online resource cm
- Place of Publication:
- Warrendale, PA SAE International 2021
- Summary:
- When the vehicle is driving on the mountain road section, it will often encounter the long downhill road section. In order to drive safely, the driver needs to take the braking measures to stabilize the speed. Due to the large mass of passenger car and the poor cooling effect of the drum brake, passenger car in the long downhill section are easy to cause brake thermal decay phenomenon, and then make the vehicle out of control, resulting in safety accidents. The braking methods of traditional fuel vehicles include friction braking, engine braking and retarder braking. For parallel type hybrid vehicles, in addition to the above braking methods, regenerative braking can also be used to convert the kinetic energy of the vehicle into electrical energy and store it in the battery. In this paper, a long downhill braking strategy of parallel type hybrid passenger car based on slope gradient is proposed to minimize the use of drum brakes and to use regenerative braking as much as possible to recover energy. By analyzing the relationship between braking efficiency of above braking methods and vehicle speed and vehicle dynamics model, the appropriate braking strategy under different slopes is determined. The temperature rise model of brake drum was established to analyze the temperature change of brake drum during the long downhill process. Then the model is simulated according to the ramp data of G22 Freeway. The results show that the passenger car brake drum's temperature decreases by 69.9 and reaches 193.1 after it goes down the chosen slope with the combined braking strategy. The brake thermal decay of the brake drum could be avoided and the brake safety could be ensured after using the combined braking strategy
- Notes:
- Vendor supplied data
- Publisher Number:
- 2021-01-0973
- Access Restriction:
- Restricted for use by site license
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