Hybrid Synergy Drive

Hybrid Synergy Drive logo

Hybrid Synergy Drive (HSD), also known as Toyota Hybrid System II, is the brand name of Toyota Motor Corporation for the hybrid car drive train technology used in vehicles with the Toyota and Lexus marques. First introduced on the Prius, the technology is an option on several other Toyota and Lexus vehicles and has been adapted for the electric drive system of the hydrogen-powered Mirai, and for a plug-in hybrid version of the Prius. Previously, Toyota also licensed its HSD technology to Nissan for use in its Nissan Altima Hybrid. Its parts supplier Aisin offers similar hybrid transmissions to other car companies.

HSD technology produces a full hybrid vehicle which allows the car to run on the electric motor only, as opposed to most other brand hybrids which cannot and are considered mild hybrids. The HSD also combines an electric drive and a planetary gearset which performs similarly to a continuously variable transmission. The Synergy Drive is a drive-by-wire system with no direct mechanical connection between the engine and the engine controls: both the gas pedal/accelerator and the gearshift lever in an HSD car merely send electrical signals to a control computer.

Lexus Hybrid Drive logo

HSD is a refinement of the original Toyota Hybrid System (THS) used in the 1997 to 2003 Toyota Prius. The second generation system first appeared on the redesigned Prius in 2004. The name was changed in anticipation of its use in vehicles outside the Toyota brand (Lexus; the HSD-derived systems used in Lexus vehicles have been termed Lexus Hybrid Drive), was implemented in the 2006 Camry and Highlander, and would eventually be implemented in the 2010 "third generation" Prius, and the 2012 Prius c. The Toyota Hybrid System is designed for increased power and efficiency, and also improved "scalability" (adaptability to larger as well as smaller vehicles), wherein the ICE/MG1 and the MG2 have separate reduction paths, and are combined in a "compound" gear which is connected to the final reduction gear train and differential;[1] it was introduced on all-wheel drive and rear-wheel drive Lexus models.[2][3] By May 2007 Toyota had sold one million hybrids worldwide; two million by the end of August 2009; and passed the 5 million mark in March 2013.[4][5] As of September 2014, more than 7 million Lexus and Toyota hybrids had been sold worldwide.[6] The United States accounted for 38% of TMC global hybrid sales as of March 2013.[5]

  1. ^ Vasilash, Gary (February 2005). "A Lexus Like No Other But Like The Rest:Introducing The RX 400h". Automotive Design and Production. Archived from the original on 2006-10-17. Retrieved 2010-07-12.
  2. ^ "Lexus GS450h – Road Tests". CAR Magazine. Archived from the original on 2011-07-26. Retrieved 2010-07-13.
  3. ^ Vasilash, Gary (July 2006). "The Lexus LS 600H L: Not Just Another Production Car". Automotive Design and Production. Archived from the original on 2007-06-17. Retrieved 2010-04-12.
  4. ^ "News Releases > Worldwide Sales of TMC Hybrids Top 2 Million Units". TOYOTA. 2009-09-04. Archived from the original on 2018-03-16. Retrieved 2009-12-03.
  5. ^ a b Toyota Press Room (2013-04-17). "Toyota cumulative global hybrid sales pass 5M, nearly 2M in US". Green Car Congress. Retrieved 2013-04-17.
  6. ^ John Voelcker (2014-10-03). "Toyota Racks Up 7 Million Hybrids Sold Since 1997". Green Car Reports. Retrieved 2014-10-03.