Belt Alternator Starters: BAS or BS?
www.hybridcars.com
What is all the recent hype about belt hybrids? Is it going to shatter the world of hybrids? Hardly. The belt system, Belt Alternator Starter (BAS), planned for the Saturn VUE Hybrid and other hybrids, is the least a carmaker can do, and still claim the hybrid badge. It's the answer when cost is the major decision factor. As others have said about this approach, you get what you pay for.
The concept is to replace the belt driven alternator with an electric motor that serve as a generator and a motor. Thus when the engine is running the motor, the generator will charge the battery. When the engine needs to be started, the motor then applies its torque via the accessory belt, and cranks the engine instead of using the starter motor.
In this scheme, the motor/generator can be made larger than a standard starter motor so more torque can be generated when in the motoring mode. This allows for quicker starts of the engine, and makes the start/stop operation possible. Stopping the engine while vehicle is at idle is a means to conserve fuel. The disadvantage to this type of system is that you notice the engine starting and stopping. The control system for this technology so far has been somewhat crude in comparison to the full hybrid engine startups and for some people it could be annoying.
The belt is a short-term solution to get 2% to 5% increase in fuel economy and it mostly affects the city mileage with hardly any effect on the highway mileage. On extremely small vehicles, the belt alternator starter might nudge a vehicle into the mild hybrid category. Otherwise, consumers should know that dealers describing vehicles with this technology as hybrids are full of BAS.
Source: http://www.hybridcars.com/belt-alternator-starters.html
Also See: http://forums.gminsidenews.com/showthread.php?t=8333&highlight=2007+malibu+hybrid
www.hybridcars.com
What is all the recent hype about belt hybrids? Is it going to shatter the world of hybrids? Hardly. The belt system, Belt Alternator Starter (BAS), planned for the Saturn VUE Hybrid and other hybrids, is the least a carmaker can do, and still claim the hybrid badge. It's the answer when cost is the major decision factor. As others have said about this approach, you get what you pay for.
The concept is to replace the belt driven alternator with an electric motor that serve as a generator and a motor. Thus when the engine is running the motor, the generator will charge the battery. When the engine needs to be started, the motor then applies its torque via the accessory belt, and cranks the engine instead of using the starter motor.
In this scheme, the motor/generator can be made larger than a standard starter motor so more torque can be generated when in the motoring mode. This allows for quicker starts of the engine, and makes the start/stop operation possible. Stopping the engine while vehicle is at idle is a means to conserve fuel. The disadvantage to this type of system is that you notice the engine starting and stopping. The control system for this technology so far has been somewhat crude in comparison to the full hybrid engine startups and for some people it could be annoying.
The belt is a short-term solution to get 2% to 5% increase in fuel economy and it mostly affects the city mileage with hardly any effect on the highway mileage. On extremely small vehicles, the belt alternator starter might nudge a vehicle into the mild hybrid category. Otherwise, consumers should know that dealers describing vehicles with this technology as hybrids are full of BAS.
Source: http://www.hybridcars.com/belt-alternator-starters.html
Also See: http://forums.gminsidenews.com/showthread.php?t=8333&highlight=2007+malibu+hybrid
