Abstract A three-motor hybrid system suitable for a super sports car was developed. This system features high power, light weight and high response, and has high cooling performance for high-load operation such as circuit driving. The power plant drives the rear wheels using the combination of a midship-mounted V6 twin-turbo engine, the direct drive motor of a hybrid system mounted directly on the engine, and a 9-speed dual-clutch transmission (DCT). The front wheels are driven by a twin-motor unit (TMU), and the size and weight of the Intelligent Power Unit (IPU) that supplies electric power to the TMU has been reduced to enable mounting behind the seats inside the cabin. In addition, the IPU uses air-conditioner cooperative cooling to enhance the cooling performance. As a result, assist is performed even during high-load operation. By utilizing this system, driving force can be distributed properly to the wheels on both sides of front and the axles of back and front to maximize acceleration and cornering performance during all situations. As a result, direct vehicle behavior according to driver's intention is realized. Electric drive (E-Drive) system has achieved following: • High-response powertrain and high acceleration performance are achieved by E-Drive system • Improvement of cornering performance by drive force distribution using three motors • High power output continuation for circuit driving by high cooling performance 1. Introduction A hybrid system for a super sports car was developed to realize high dynamic performance. The combination of this electric drive (EDrive) system and a V6 twin-turbo engine enables to obtain the same acceleration performance as a V10 engine. In addition, the direct response of an electric system and traction force allocation achieves high cornering performance. This paper describes the details of the system of this hybrid system. 2. System Overview 2.1. System Concept Figure 1 shows the system concept. This system was developed with the vehicle concepts of Direct & Linear “Thrust” and “On the Rails Cornering” to realize the vehicle behavior intended by the driver while delivering high performance. The E-Drive system uses three motors to enhance cornering performance by torque vectoring and front/rear traction force allocation. In addition, direct acceleration response is achieved by a constant assist according to the accelerator position (AP) utilizing the twin-motor unit (TMU) and compensating lack of low speed torque of the turbocharged engine with the direct drive motor and the high-power battery. These techniques are realized by making full use of the advantages of an electric motor such as high torque in low speed area and instant response. Figure 1. System conceptDevelopment of Electric Drive System for New Model Super Sports Hybrid Vehicle2016-01-1685 Published 04/05/2016 Sayaka Tamura and Tsutomu Yoshinari Honda R&D Co., Ltd. CITATION: Tamura, S. and Yoshinari, T., "Development of Electric Drive System for New Model Super Sports Hybrid Vehicle," SAE Technical Paper 2016-01-1685, 2016, doi:10.4271/2016-01-1685. Copyright © 2016 SAE International2.2. System Configuration and Specification Figure 2 shows the E-Drive hardware configuration. The power plant is mounted vertically midship, and the V6 twin-turbo engine was newly developed for this super sports car. The direct drive motor is mounted directly on the engine crankshaft. The rotor of this motor is coupled directly with the flywheel, and power is transmitted via a 9-speed dual-clutch transmission (DCT) to drive the rear wheels. Figure 3 shows this layout. The front wheels are driven by the TMU. The TMU consists of two independent motors, planetary gear sets and a brake. It can freely allocate the right/left torque in any speed region. The Power Drive Unit (PDU) that drives these three motors is located in the center of the cabin. The Intelligent Power Unit (IPU) includes a