Assessment of an electrical coolant pump on a heavy‑duty diesel engine

摘要

Hybridization of the drive train in commercial vehicles is a key solution toward meeting the strict future requirementsto reduce carbon dioxide emissions within the European Union. In order to decrease fleet consumption a large numberof different hybrid systems are already available in series in the passenger car sector. Due to the cheap and powerful48 volt hybrid components and the lower hazard potential compared to high voltage, future commercial vehicles couldalso benefit from the 48V technology and contribute to lower fleet fuel consumption. Therefore, a complete 48V mildhybrid system was built on the diesel engine test bench as part of a research project. This paper highlights the utilizationof a powerful 48V-motor to propel the coolant pump on a diesel engine of the 13-L commercial vehicle class. Three differentdrive variants of the coolant pump were implemented and measured on the diesel engine test bench. MATLAB®/Simulink®-simulations were conducted to assess the possible fuel savings in three different driving cycles. This paperprovides a summary and interpretation of the measurement and simulation results. The simulation studies predict adecrease of fuel consumption of up to 0.94%. Furthermore, the additional advantages of electrified coolant pumpsbased on 48V are discussed.