Maximizing Coasting of 48V Vehicles with Cold-Storage Evaporator DENSO Corporation

Format:

Conference/Event

Author/Creator:

Özbek, Özbek, author.

Contributor:

Biglia, Matteo

Györög, Tibor

Inaba, Atsushi

Kohli, Vipul

Nishida, Shin

Nishikawa PhD, Michio

Conference Name:

CO2 Reduction for Transportation Systems Conference (2018-06-06 : Turin, Italy)

Language:

English

Physical Description:

1 online resource

Place of Publication:

Warrendale, PA SAE International 2018

Summary:

AbstractOne of the main features of 48V vehicles is the ability to coast at high speeds with the Internal Combustion Engine (ICE) off. This can be realized due to the high torque and power the 48V motor-generator provides which allows a quick and smooth re-cranking of the ICE. The coasting feature reduces the fuel consumption depending on frequency and duration of the coasting events. This depends in turn on driving pattern, driving style, State-of-Charge of the 48V and 12V batteries and the air-conditioning (A/C) system.In summer, if the A/C runs with a mechanical belt-driven compressor, the cabin inlet air temperature from the evaporator inevitably increases during each coasting event as the ICE turns off and cannot operate the compressor. If the evaporator temperature reaches a certain threshold at which the cabin comfort is noticeably affected, the ICE is re-cranked for resuming air-conditioning. This operation during vehicle deceleration and vehicle standstill is inefficient as fuel is consumed solely for operating the A/C. Therefore, it is beneficial for fuel consumption if the evaporator maintains low temperature for long time during coasting with ICE off. One way to overcome this is to use an electrical compressor independently operated from the powertrain. However, this is a cost intensive solution, due to higher cost of electrical compressors and increased capacity of the 48V battery required for the additional A/C supply. A more cost-effective solution is to use Phase-Change-Materials (PCM) with high thermal capacity and specified melting temperature optimized for this purpose.DENSO has developed an evaporator with modular concept to integrate PCM-filled tanks, referred to as cold-storage (CS-evaporator), which is specifically designed to maximize coasting duration of 48V vehicles. Tests show that a fuel consumption reduction of around 5% is possible at 30°C ambient temperature

Notes:

Vendor supplied data

Publisher Number:

2018-37-0023

Access Restriction:

Restricted for use by site license