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200 stop-start to be efficient BSG design

by David Zatz on

An optional stop-start system for the Chrysler 200 has been in the works for some time, and has been all but confirmed, partly by showing up on dealer  screens (though not yet available for orders).

2015 200
Allpar member “pat fromigh” confirmed earlier reports that Chrysler will likely be using a belt-starter generator (BSG) design, due to its efficiency and effectiveness. He wrote, “The Chrysler’s BSG is an improvement over [General Motors’] e-assist. Chrysler engineers have the electronic belt tensioner adjust for lower parasitic loss at highway speeds.”

He pointed to a Department of Energy presentation by Chrysler, which noted:

  • iDFSO is available down to 15 mph
  • BSG provides enabler for iDFSO [Deceleration Fuel Shut Off] from 15 mph to 0 mph
  •  Simulated ~2% fuel savings potential on FTP Combined
  • Addition of the BSG requires electronic belt tensioner to reduce tension during generation mode and increase during motoring mode

He then wrote, “Many industry observers are saying light hybrid systems such as the BSG will be the predominate choice in the future. It replaces the  alternator, battery, and starter with the tensioner, starter/generator, and a battery pack. This means less of a cost and weight penalty than a full hybrid, while improving fuel efficiency.”

Chrysler has been quietly working on both fully electric cars and, more seriously, hybrid-electric vehicles for years now, with a full minivan plug-in hybrid partnership with the U.S. Postal Service. CEO Sergio Marchionne has stated that the first Chrysler hybrid to be produced will be a minivan, around 2016, but the first stop-start systems with a BSG design should enter production in a few months. Fuel mileage savings will be minor, but the cost will also be much lower than a full hybrid system, without the need for massive batteries or heavy motors at the wheels.


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