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Hybrid System Heat Management that Contributes to High Performance for New NSX

Article of Honda R&D Technical Review Vol.28 No.2


A hybrid system with three motors was developed to realize the high power train system power and vehicle dynamic performance that are the vehicle concepts of the new NSX. Efforts were made to enhance the cooling performance in order to simultaneously reduce the size and increase the power of each hybrid system component. To achieve high cooling performance compared to that of the conventional hybrid system, the direct drive motor is directly cooled by the engine cooling water, an oil cooler has been added to the Twin Motor Unit, the size of the dedicated radiator for the Power Drive Unit has been increased, and the Intelligent Power Unit uses an air conditioner cooperative battery cooling system.
As a result, thermal feasibility of the hybrid system during high-load driving was achieved. The power train system, which consists of the engine and three motor systems, achieved the high power of 427 kW. In addition, the motor assist of the hybrid system compensated the turbo lag, which is an issue for supercharged engines, enabling rapid response acceleration. Furthermore, the longitudinal and lateral driving force allocation control performed by the hybrid system realized a good balance between cornering performance and high-speed stability.


(1) Toyoshima, H.: 3-motor HEV Powertrain for super sport, Internationaler Motorenkongress 2016, p. 23-30, (2016)
(2) Fukuda, K., Mitani, M., Matsuzawa, Y., Kawata, M., Uetake, J.: Development of Battery System for the New NSX, EVTeC & APE Japan, 20169074, (2016)
(3) Tamura, S., Yoshinari, T.: Development of Electric Drive system for New Model Super Sports Hybrid Vehicle, SAE Technical Paper, 2016-01-1685, (2016)

Author (organization or company)

Koichi TAKAHASHI(Automobile R&D Center)、Keisuke URUSHIHARA(Automobile R&D Center)

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