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Hub AI
BAS hybrid AI simulator
(@BAS hybrid_simulator)
Hub AI
BAS hybrid AI simulator
(@BAS hybrid_simulator)
BAS hybrid
BAS (belted alternator starter) is a category of automotive parallel hybrid technology that uses an electric motor to contribute power to the internal combustion engine's crankshaft via a serpentine belt. By mounting this motor generator unit in the conventional location traditionally used for the standard automotive alternator, it permits a low-cost method of adding mild hybrid capabilities such as start-stop, power assist, and mild levels of regenerative braking. BAS systems differ from other mild hybrid systems as they are not run off the vehicle's crankshaft.
In June 2001, Toyota introduced a BAS hybrid system under the Toyota Hybrid System-Mild (THS-M) brand name. It operates similarly to other mild hybrids with a start-stop system, in that it shuts down the engine as the vehicle comes to a stop and instantly restarts it when the brake pedal is released.
THS-M is capable of modest power assist during launch acceleration and similarly modest levels of "blended" regenerative braking during deceleration. A 36-volt lead–acid battery (housed in the vehicle's trunk and operating in a 42-volt electrical system) is used to operate a permanent magnet motor/generator unit mounted to the engine in a similar fashion to a conventional alternator. Then, through a high-tension drive belt, the motor/generator unit is capable of starting or assisting the engine. A conventional 12-volt battery and starter motor are retained and used whenever the engine is cold as during initial start-up.
Although unable to operate in pure all-electric EV mode, THS-M improves city and highway fuel efficiency over non-hybrid versions. According to Toyota, the system provides a 15% increase in fuel economy. The system is designed to be simple and easily adaptable across a wide range of vehicles, with no significant modifications required to the vehicle chassis to accommodate the system. This allows THS-M vehicles to be produced on the same assembly line as non-hybrid versions, producing substantial cost savings and allowing production to be adjusted more easily.
The first production model equipped with THS-M was the eleventh generation Toyota Crown Royal Saloon Mild Hybrid, introduced in August 2001, combining the system with a 3.0 L 2JZ-FSE straight-six engine. It was followed in October 2002 by the Toyota Crown Sedan Super Deluxe Mild Hybrid, which combines the system with a 2.0 L 1G-FE engine.
General Motors introduced a BAS hybrid system in the 2007 Saturn Vue Green Line. The BAS is in the 2008–2009 Chevrolet Malibu Hybrid. It operates on the same principle as Toyota's THS-M using a 36-volt electrical system (at 42–45 volts).
According to the EPA, the 2009 Saturn Vue BAS hybrid garners an improvement of 32% city (19>25mpg) and 24% highway (26>32mpg) making the combined economy improvement 27% (22>28mpg) over the base 4-cylinder FWD version. The system is reasonably simple and inexpensive, making BAS equipped vehicles some of the least expensive hybrids available.
Vehicles with the BAS system use a conventional 4T45-E automatic transmission which has been modified to include a more efficient final-drive ratio and includes an electrically driven pump to provide pressure in auto-stop mode. The air conditioning compressor continues to be operated through a belt-driven pulley, but for fuel economy improvement it can be disabled in auto-stop mode if the "ECO" A/C mode has been selected by the operator.
BAS hybrid
BAS (belted alternator starter) is a category of automotive parallel hybrid technology that uses an electric motor to contribute power to the internal combustion engine's crankshaft via a serpentine belt. By mounting this motor generator unit in the conventional location traditionally used for the standard automotive alternator, it permits a low-cost method of adding mild hybrid capabilities such as start-stop, power assist, and mild levels of regenerative braking. BAS systems differ from other mild hybrid systems as they are not run off the vehicle's crankshaft.
In June 2001, Toyota introduced a BAS hybrid system under the Toyota Hybrid System-Mild (THS-M) brand name. It operates similarly to other mild hybrids with a start-stop system, in that it shuts down the engine as the vehicle comes to a stop and instantly restarts it when the brake pedal is released.
THS-M is capable of modest power assist during launch acceleration and similarly modest levels of "blended" regenerative braking during deceleration. A 36-volt lead–acid battery (housed in the vehicle's trunk and operating in a 42-volt electrical system) is used to operate a permanent magnet motor/generator unit mounted to the engine in a similar fashion to a conventional alternator. Then, through a high-tension drive belt, the motor/generator unit is capable of starting or assisting the engine. A conventional 12-volt battery and starter motor are retained and used whenever the engine is cold as during initial start-up.
Although unable to operate in pure all-electric EV mode, THS-M improves city and highway fuel efficiency over non-hybrid versions. According to Toyota, the system provides a 15% increase in fuel economy. The system is designed to be simple and easily adaptable across a wide range of vehicles, with no significant modifications required to the vehicle chassis to accommodate the system. This allows THS-M vehicles to be produced on the same assembly line as non-hybrid versions, producing substantial cost savings and allowing production to be adjusted more easily.
The first production model equipped with THS-M was the eleventh generation Toyota Crown Royal Saloon Mild Hybrid, introduced in August 2001, combining the system with a 3.0 L 2JZ-FSE straight-six engine. It was followed in October 2002 by the Toyota Crown Sedan Super Deluxe Mild Hybrid, which combines the system with a 2.0 L 1G-FE engine.
General Motors introduced a BAS hybrid system in the 2007 Saturn Vue Green Line. The BAS is in the 2008–2009 Chevrolet Malibu Hybrid. It operates on the same principle as Toyota's THS-M using a 36-volt electrical system (at 42–45 volts).
According to the EPA, the 2009 Saturn Vue BAS hybrid garners an improvement of 32% city (19>25mpg) and 24% highway (26>32mpg) making the combined economy improvement 27% (22>28mpg) over the base 4-cylinder FWD version. The system is reasonably simple and inexpensive, making BAS equipped vehicles some of the least expensive hybrids available.
Vehicles with the BAS system use a conventional 4T45-E automatic transmission which has been modified to include a more efficient final-drive ratio and includes an electrically driven pump to provide pressure in auto-stop mode. The air conditioning compressor continues to be operated through a belt-driven pulley, but for fuel economy improvement it can be disabled in auto-stop mode if the "ECO" A/C mode has been selected by the operator.