Development of An Intelligent Thermal Management System for BYD DM-i Hybrid Engine BYD Auto Industry Company Limited

Format:

Book

Conference/Event

Author/Creator:

lu, Guoxiang, author.

Contributor:

Gong, Zewen

Rong, Yulong

Wang, Bo

Yang, Dongsheng

Conference Name:

SAE Powertrains, Fuels & Lubricants Digital Summit (2021-09-28 : Live Online, Pennsylvania, United States)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2021

Summary:

BYD recently introduced its new DM-i (Dual Mode Intelligent) hybrid platform with a new dedicated 1.5NA high-efficient engine, which has a peak brake thermal efficiency of 43%. This platform is electric-driven primarily and the engine only starts on demand. This requires that once started, the engine can reach its best working temperature as quick as possible. To achieve this target, BYD designed a new intelligent thermal management system. This system adopted an advanced split cooling strategy to control the flow ratio between the cylinder block and head, which was realized by a combination of one electric thermostat and one traditional wax thermostat. An electric water pump was used to actively control the coolant flow rate of the system. Together with intelligent control of the thermal needs under all working conditions, the new thermal management system realized the following benefits: faster engine warm-up, better fuel economy and emissions reduction.1D simulation was used to optimize the flow ratio between cylinder block and head. By analyzing the flow and velocity distribution, temperature level and pressure drop of each component in the HT (High Temperature) loop and LT (Low Temperature) loop, the cooling performance of this new thermal management system was evaluated and optimized. 3D simulation was used to optimize the flow channel design. Good flow and velocity distribution without flow dead zones and local boiling area of the cooling system was ensured. Finally, the performance of the thermal management cooling system was validated on the engine test bench and the coolant temperature map was calibrated with multi-object optimization

Notes:

Vendor supplied data

Publisher Number:

2021-01-1153

Access Restriction:

Restricted for use by site license