xcel
01-19-2009, 01:52 AM
Fuel efficient everything, HEV’s, PHEV’s, and BEV’s bested by a common device used in every vehicle on the road today? (cleanmpg.com/forums/showthread.php?p=181161)
http://www.cleanmpg.com/photos/data/501/BMW_1_Series_3-Door.jpgWayne Gerdes – CleanMPG (cleanmpg.com) – Jan. 19, 2009
2009 BMW 116d – 53.5 mpgUS combined on the NEDC. The device improves the 116d’s FE by upwards of 6% compared to a 116d without.
During our last hours at the 2009 North American International Auto Show in Detroit, we happened across the Denso display area. Along with any number of fuel efficient, safety and infotainment gear, a simple piece of HW grabbed our attention.
Although it did not have the flash of the latest 2010 Prius-III, Insight-II or Ford Focus BEV, this simple and completely understated piece of HW could possibly save more fuel than all the other vehicle’s and their specialized hardware combined.
What is this device that is on 99.97% of the vehicles we have driven? The gear reduction starter motor.
How a starter works
An automobiles starter is responsible for turning over the vehicles engine so it can start using its own power via combustion of fuel. The starter engagement mechanism itself is controlled by a solenoid which is responsible for engaging and disengaging the starter motor.
When you turn the key, a small amount of current from the battery engages the starter solenoid which in turn engages the starter motor with the engines flywheel. A large amount of current is then supplied to the starter motor itself that actually turns the flywheel which in turn rotates the engine to “start” the car.
After the engine has started, the same solenoid that engaged the starter motor disengages the starter motor from the engine.
The electric starter motor has been used in a similar fashion since Charles Kettering invented the first practical electric automobile starter in 1912.
What is new?
With vehicles at a standstill for as much as one-third of the time in urban areas, simply shutting down an idling engine stops the needless consumption of fuel while going nowhere. This can save upwards of 7-percent of the fuel an average automobile consumes on a daily basis.
Stop-start systems not only save fuel but also reduce GHG and SMOG forming tailpipe emissions in those same urban areas.
The ‘Idle-Stop System’ equipped on hybrid electric vehicles shuts off the engine when a vehicle stops at a traffic signal. In a non-hybrid automobile, you may only start and stop your automobile’s engine two or three times a day. An Idle-Stop equipped automobile may start and stop an engine tens to hundreds of times depending on the driving cycle encountered. This multiple dozens of starts would place extreme strain on an ordinary starter motor that starts the engine and thus a much more robust system was created.
What Denso did was to increase the useful life of the starter by tenfold, enabling it to reach a mean time between failure (MTBF) of 200,000 to 300,000 Start/Stop cycles. As a result, people can shut off their engine without any worries while temporarily stopped, instead of idling while stuck in traffic or waiting at a red light.
The future is now
Automobile manufacturers are always seeking more power from smaller and lighter starter motors and alternators and the simple Stop/Start gear reduction starter motors work perfectly as a stand alone product. Unfortunately, the Stop/Start starter motor does not get rid of the alternator.
The next advanced is an Integrated Starter Generator (ISG), a product which combines the starter motor and the alternator. An ISG can help to decelerate the vehicle by generating electric power via regenerative braking. The electric power generated charges the battery for the next start cycle of for other electrical ancillary loads thus reducing overall fuel consumption.
Another use is if a clutch disconnects the ISG and the A/C compressor from the engine during the idle stop, the ISG can drive an all-electric or belt driven mechanical A/C during an ICE-Off event similar to how the current Prius-II and HCH-II operates.
"Integrated Starter Generators [ISGs] are now being seen on a few vehicle models," said Marko Wowczyna, manager of Denso UK Aftermarket Sales. "In contrast with traditional technology, ISGs combine two components - the alternator and the starter - into one integrated system. This creates a 'stop-start' effect that operates by cutting the engine when the driver comes to a complete halt. The engine is switched back on when the driver releases the brake pedal. ISG technology can offer fuel savings, reduced noise pollution and lower emissions; but is a costly technology requiring additional components and reorganized engine design. This is a field currently being explored by Denso at OEM level that could ultimately filter through to aftermarket customers."
Denso is just one of many manufacturers producing advanced ISG’s. While the global share for idle-stop systems and hybrid-vehicle systems using electric motors for idle stop is currently only 1-percent, this will rise. While we are waiting for affordable HEVs, PHEVs and BEVs, this somewhat simple yet highly advanced piece of HW is already performing Start/Stop and Alternator functions on the European BMW118 and 116d’s, Smart Fortwo Micro-hybrid, Japanese Toyota Vitz and Estima and soon to include the European and Asian iQ.
Whether the goal is a future CAFÉ standard, reduction in GHG’s, Peak Oil or simple marketplace competition to place ever higher Fuel Economy capable automobiles on the showroom floor, Auto Start/Stop motor/generators are the real fuel savers and they have arrived none to soon.
http://www.cleanmpg.com/photos/data/501/BMW_1_Series_3-Door.jpgWayne Gerdes – CleanMPG (cleanmpg.com) – Jan. 19, 2009
2009 BMW 116d – 53.5 mpgUS combined on the NEDC. The device improves the 116d’s FE by upwards of 6% compared to a 116d without.
During our last hours at the 2009 North American International Auto Show in Detroit, we happened across the Denso display area. Along with any number of fuel efficient, safety and infotainment gear, a simple piece of HW grabbed our attention.
Although it did not have the flash of the latest 2010 Prius-III, Insight-II or Ford Focus BEV, this simple and completely understated piece of HW could possibly save more fuel than all the other vehicle’s and their specialized hardware combined.
What is this device that is on 99.97% of the vehicles we have driven? The gear reduction starter motor.
How a starter works
An automobiles starter is responsible for turning over the vehicles engine so it can start using its own power via combustion of fuel. The starter engagement mechanism itself is controlled by a solenoid which is responsible for engaging and disengaging the starter motor.
When you turn the key, a small amount of current from the battery engages the starter solenoid which in turn engages the starter motor with the engines flywheel. A large amount of current is then supplied to the starter motor itself that actually turns the flywheel which in turn rotates the engine to “start” the car.
After the engine has started, the same solenoid that engaged the starter motor disengages the starter motor from the engine.
The electric starter motor has been used in a similar fashion since Charles Kettering invented the first practical electric automobile starter in 1912.
What is new?
With vehicles at a standstill for as much as one-third of the time in urban areas, simply shutting down an idling engine stops the needless consumption of fuel while going nowhere. This can save upwards of 7-percent of the fuel an average automobile consumes on a daily basis.
Stop-start systems not only save fuel but also reduce GHG and SMOG forming tailpipe emissions in those same urban areas.
The ‘Idle-Stop System’ equipped on hybrid electric vehicles shuts off the engine when a vehicle stops at a traffic signal. In a non-hybrid automobile, you may only start and stop your automobile’s engine two or three times a day. An Idle-Stop equipped automobile may start and stop an engine tens to hundreds of times depending on the driving cycle encountered. This multiple dozens of starts would place extreme strain on an ordinary starter motor that starts the engine and thus a much more robust system was created.
What Denso did was to increase the useful life of the starter by tenfold, enabling it to reach a mean time between failure (MTBF) of 200,000 to 300,000 Start/Stop cycles. As a result, people can shut off their engine without any worries while temporarily stopped, instead of idling while stuck in traffic or waiting at a red light.
The future is now
Automobile manufacturers are always seeking more power from smaller and lighter starter motors and alternators and the simple Stop/Start gear reduction starter motors work perfectly as a stand alone product. Unfortunately, the Stop/Start starter motor does not get rid of the alternator.
The next advanced is an Integrated Starter Generator (ISG), a product which combines the starter motor and the alternator. An ISG can help to decelerate the vehicle by generating electric power via regenerative braking. The electric power generated charges the battery for the next start cycle of for other electrical ancillary loads thus reducing overall fuel consumption.
Another use is if a clutch disconnects the ISG and the A/C compressor from the engine during the idle stop, the ISG can drive an all-electric or belt driven mechanical A/C during an ICE-Off event similar to how the current Prius-II and HCH-II operates.
"Integrated Starter Generators [ISGs] are now being seen on a few vehicle models," said Marko Wowczyna, manager of Denso UK Aftermarket Sales. "In contrast with traditional technology, ISGs combine two components - the alternator and the starter - into one integrated system. This creates a 'stop-start' effect that operates by cutting the engine when the driver comes to a complete halt. The engine is switched back on when the driver releases the brake pedal. ISG technology can offer fuel savings, reduced noise pollution and lower emissions; but is a costly technology requiring additional components and reorganized engine design. This is a field currently being explored by Denso at OEM level that could ultimately filter through to aftermarket customers."
Denso is just one of many manufacturers producing advanced ISG’s. While the global share for idle-stop systems and hybrid-vehicle systems using electric motors for idle stop is currently only 1-percent, this will rise. While we are waiting for affordable HEVs, PHEVs and BEVs, this somewhat simple yet highly advanced piece of HW is already performing Start/Stop and Alternator functions on the European BMW118 and 116d’s, Smart Fortwo Micro-hybrid, Japanese Toyota Vitz and Estima and soon to include the European and Asian iQ.
Whether the goal is a future CAFÉ standard, reduction in GHG’s, Peak Oil or simple marketplace competition to place ever higher Fuel Economy capable automobiles on the showroom floor, Auto Start/Stop motor/generators are the real fuel savers and they have arrived none to soon.