Digital Library on Green Mobility


Drivetrain Technology

Inventor/Assignee: Takeo Aizawa, Taiichi Onoyama | Current Assignee: Nissan Motor Co Ltd


Introduction: Drivetrain is the assembly of all the components involved in the transmission of the power from the engine of the vehicle to its wheels. The elements of the drivetrain perform the following functions:

  1. Remain stationary even with the engine running

  2. Achieve the transition from a stationary to a mobile state

  3. Convert torque and rotational speed

  4. Provide for forward and reverse motion

  5. Compensate for wheel-speed variations in curves

  6. Ensure that the power unit remains within a range on the operating curve

  7. Commensurate with minimum fuel consumption and exhaust emissions

Process: The function of the drivetrain is to couple the engine that produces the power to the driving wheels that use this mechanical power to rotate the axle. This connection involves physically linking the two components, which may be at opposite ends of the vehicle and so requiring a long propeller shaft or drive shaft. The operating speed of the engine and wheels are also different and must be matched by the correct gear ratio. As the vehicle speed changes, the ideal engine speed must remain approximately constant for efficient operation and so this gearbox ratio must also be changed, either manually, automatically or by an automatic continuous variation.

An electric vehicle drivetrain comprises:

  • Hybrid motor assembly comprising an AC motor and a DC motor;
  • Power stage is configured to deliver a predetermined amount of the electrical energy to the AC and DC motors, and
  • Microprocessor-based control system configured to control the drivetrain.

AC-DC converters (rectifiers), DC-DC converters, and DC-AC converters (inverters) are the three types of power converters found in powertrain electrification systems used in vehicle propulsion systems (inverters).

Commercialization: Audi, BMW, Hyundai, Kia, Tesla

Use Cases: Automobile industry (Passenger cars, Electric trucks, Commercial vehicles - Light/Heavy)

Patent: US7053566B2

Theme: Vehicle Technology | Subtheme: Electric vehicles


A Review on Drive Train Technologies for Passenger Electric Vehicles

Automotive Drivetrain Technology Market by Vehicle Type and Technology Type : Global Opportunity Analysis and Industry Forecast, 2019-2030

Related Documents



This book comprehensively deals in fundamentals, theory and design of conventional vehicles wi... Read More

Research Papers/Articles


In the modern power sector it is important to gain optimal scheduling to solve profit based un... Read More


World Electric Vehicle Journal

Published Year: 2007


The World Electric Vehicle Journal is the first peer-reviewed international scientific journal... Read More