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Stop-start: Chrysler design

by David Zatz on

The stop-start system of the 2015 Jeep Cherokee, which helped boost combined mileage ratings of some models by 2 mpg, was developed by Chrysler itself, according to a company spokesman. “Chrysler Group powertrain engineering did all the integration and controls for this system.” The components are, since Chrysler has not made starters for some years, purchased from multiple suppliers.

While a belt starter-generator (BSG) stop-start setup is reportedly still being developed, since it is seen as the most efficient system, it remains in the future. The BSG setup was referenced in both public and private Chrysler materials.

The Jeep Cherokee uses an enhanced-starter system, whose main components are:

  • A stronger, 220-amp alternator
  • An absorbent glass mat (AGM) high-durability battery
  • A modified starter with hardened gears, reinforced castings,  higher-power motor, longer life brushes, and higher-precision bearings and shaft
  • An oversized Denso starter solenoid
  • An special relay and voltage stabilizing module that prevent voltage dips during cranking
  • A Bosch battery sensor which predicts voltage and capacity, also measuring alternator output and battery temperature
  • Special programming in the car computer

The future likely holds the belt-driven starter-generator (BSG) system, which apparently is still under development, being implemented on different cars or replacing the current setup.

Fuel mileage is a key concern for auto manufacturers partly because some customers consider it to be a key decision factor, partly because they do not want to be disregarded during the next fuel-price runup, and largely because of increasing corporate average fuel economy standards coupled with an increase in sales of larger crossovers and trucks.

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