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Development of a Parallel Hybrid System for RWD Vehicles

Journal Article
ISSN: 1946-3936, e-ISSN: 1946-3944
Published April 12, 2011 by SAE International in United States
Development of a Parallel Hybrid System for RWD Vehicles
Citation: Hayasaki, K., Abe, T., Tanishima, K., and Chujo, K., "Development of a Parallel Hybrid System for RWD Vehicles," SAE Int. J. Engines 4(1):1071-1087, 2011,
Language: English


In December 2006, Nissan announced its Nissan Green Program 2010 (NGP 2010), a mid-term environmental action plan that includes initiatives to reduce vehicle emissions. In line with this plan, the company intends to introduce a new and original hybrid system in fiscal year 2010. Specifically, this system-called the “Infiniti Direct Response Hybrid”-is a one-motor, two-clutch parallel hybrid system that eliminates the need for a torque converter. It will be featured in the 2012 Infiniti M35 Hybrid and provides the following advantages.
  1. 1
    Significant improvement in fuel economy even in Highway driving
  2. 2
    Better response and a more direct feeling
  3. 3
    Lightweight and low cost
This one-motor, two-clutch system without torque converter possesses a simple but highly capable architecture that is new to the passenger vehicle segment. The successful development of this system hinged on breakthroughs in the following areas.
  1. 1
    High speed control of switching between charging/discharging
  2. 2
    Immediate and high-output power assist
  3. 3
    Smoothness at engine start
Nissan has developed the following proprietary technologies to realize the development of this system.
  • High-output and high-speed lithium-ion battery
  • Innovative high-speed and precise motor control
This paper provides an outline and description of this new one-motor, two-clutch parallel hybrid system as well as the key breakthrough technologies that made it possible.