An Overview of a Hybrid Electric Vehicle (HEV) Transmission

 Average 4.5 out of 5

A module containing a lab, PowerPoint presentation, and modified syllabus which all relate to Toyota's continously variable HEV transmission. This resource was developed through seed funding from the CAAT.


This module consists of a lab, PowerPoint presentation, and modified syllabus which all relate to Toyota's continuously variable HEV transmission. All materials were developed under a seed grant from the CAAT. The PowerPoint discusses: 

  1. The use of a dry dampener in place of a torque converter.
  2. The various roles and controls of each motor in the transmission.
  3. Structure and efficiency of motor magnets by angle orientation.
  4. Speed sensor operation through magnets and coils.
  5. Power flow through the internal combustion engine, electric motors, batteries, transmission, and invertor under various driving conditions.

The lab is intended to familiarize technicians with common service point locations and procedures on a Prius Hybrid (2003-2011) such as coolant bleed and fill (engine and inverter), transmission fluid drain and fill, high voltage wiring, auxiliary battery and precautions, and activating Inspection Mode. For educators looking to modify current courses, the syllabus has highlighted fields where the HEV transmission was incorporated into an automotive transmissions and transaxles course at Lewis and Clark Community College.

This material is based upon work supported by the National Science Foundation under
Grant No. 1003032. 

Any opinions, findings, and conclusions or recommendations expressed in this material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation.

Electric Machines and Power Electronics
HEV/EV System Technologies (HEV, EV, and Plug-in HEV)
Product Lifecycle:
Post-production: Service, Reuse, and Recycling
Resource Type:
Lab Activity
Lewis and Clark Community College
Author & Title:
Christopher E. Reynolds Sr. - Automotive Technology Instructor
Date Developed:
Monday, December 17, 2012
CVT,Fluids,MG1,MG2,Service,Toyota Prius,Transmission
Education Level:
Undergrad Students (13-14)