Mild hybrids (also known as power-assist hybrids, battery-assisted hybrid vehicles or BAHVs) are generally cars with an internal combustion engine equipped with an electric machine (one motor/generator in a parallel hybrid configuration) allowing the engine to be turned off whenever the car is coasting, braking, or stopped, and then quickly restarted once power is again required. Mild hybrids may employ regenerative braking and some level of power assist to the internal combustion engine (ICE), but mild hybrids do not have an electric-only mode of propulsion.[1][2][3]
The mild hybrid's electric motor provides greater efficiency through the use of a single device that is essentially an integrated starter/alternator sometimes known as a generator-motor unit. A typical mild-hybrid setup uses a belt-powered generator-motor unit driven off the engine to supply power to a small battery. The generator is also powered through regenerative braking, enabling power that would otherwise be dissipated as heat to be recaptured and recovered for use in powering the vehicle. The small power assist generated by mild-hybrid systems can help supplement the gas engine in low-speed situations or handle the demands of engine start/stop functionality. Vehicles equipped with a mild-hybrid system typically see anywhere from a 1–4 miles per gallon improvement in fuel economy relative to comparable models without the technology.[4]
Mild hybrids do not require the same level of battery power and do not achieve the same levels of fuel economy improvement as compared to full hybrid models. One example is the 2005-07 Chevrolet Silverado, Parallel Hybrid Truck (PHT) a full-size pickup truck with a single 7 kW 3-phase electric motor mounted in the bell-housing between the engine and a conventional 4L60E transmission. Chevrolet was able to get a 10% improvement on the Silverado's city fuel efficiency by shutting down and restarting the engine on demand, and the reduction of parasitic accessory loads. However the PHT had no power assist features or all-electric "electric vehicle" (EV) capability, and very limited regenerative braking features.[citation needed]
Compared with a full hybrid vehicle, mild hybrids may provide some of the benefits of the application of hybrid technologies, with less of the cost–weight penalty that is incurred by installing a full hybrid series-parallel drivetrain. Fuel savings would generally be lower than expected with use of a full hybrid design, as the design does not facilitate high levels of regenerative braking or necessarily promote the use of smaller, lighter, more efficient internal combustion engines.
Examples
General Motors
General Motors mild hybrids including the Parallel Hybrid Truck (PHT) and numerous cars and SUVs equipped with the BAS Hybrid system, often use a 36- to 48-volt system to supply the power needed for the startup motor, as well as a source of power to compensate for the increasing number of electronic accessories on modern vehicles.[5] GM's belt alternator starter (BAS) mild hybrid system uses a belt drive to start the internal combustion engine (ICE) through its motor–generator unit (MGU), then once started the engine drives the 14.5 kW motor-generator to charge the batteries. The BAS hybrid system also utilizes regenerative braking to replenish the system's 36 V battery and can provide moderate levels of power assist. According to the EPA, a 2009 Saturn Vue Greenline equipped with the BAS Hybrid system delivers a 27% improvement in combined fuel economy over the non-hybrid version (FWD 4cyl).[6]
Honda's Integrated Motor Assist directly attaches a brushless DC motor between the flywheel and transaxle, providing both assistance during acceleration and regeneration during coasting/braking. It has been produced in various voltages and power outputs, as dictated by the size and weight of the vehicle application. Models equipped with the Integrated Motor Assist include the Honda Insight (1999–2006, 2009–2014), Honda Jazz (2011– ) Honda Civic (2003–2015), Honda Accord (2005–2007), and CR-Z (2010–2016).
During the 2008 Olympic Games in Beijing in August, Chinese automobile manufacturer Chang'an Motors supplied a number of hybrid-drive cars as taxis for the athletes and spectators. The power electronics for the "mild hybrid" drive was supplied by Infineon.[7]
Toyota sold mild hybrid versions of the Toyota Crown executive sedan between 2001 and 2003 and the mid-size Crown Sedan between 2002 and 2008 in the Japanese domestic market.[8][9] These models combined a BAS hybrid system with the standard straight-6 petrol engines for increased fuel economy. Toyota now sells a full hybrid version of the Crown under their brand name Hybrid Synergy Drive.
MINI and BMW have start and stop, and some with regenerative braking, in all of their vehicles sold in Europe running 4-cylinder engines with manual transmissions.
Citroën proposes a stop and start system on its C2 and C3 models.[10] The concept-car C5 Airscape has an improved version of that, adding regenerative braking and traction assistance functionalities, and ultracapacitors for energy buffering.[11]
In 2004 VW brought two mild hybrid concept cars to Shanghai for the Challenge Bibendum.[12]
^"History of Toyota - 75 years - Crown vehicle lineage". Toyota. Retrieved 2022-01-27.
^. 23 October 2009. Archived from the original on 23 October 2009.
^. Citroen.com. Archived from the original on 2013-10-29. Retrieved 2017-01-01.
^. Citroen.com. Archived from the original on 2013-10-29. Retrieved 2017-01-01.
^"VW Brings Diesel Mild-Hybrid Concept to Shanghai". Green Car Congress. 2004-10-13. Retrieved 2017-01-01.
January 17, 2023
mild, hybrid, also, known, power, assist, hybrids, battery, assisted, hybrid, vehicles, bahvs, generally, cars, with, internal, combustion, engine, equipped, with, electric, machine, motor, generator, parallel, hybrid, configuration, allowing, engine, turned, . Mild hybrids also known as power assist hybrids battery assisted hybrid vehicles or BAHVs are generally cars with an internal combustion engine equipped with an electric machine one motor generator in a parallel hybrid configuration allowing the engine to be turned off whenever the car is coasting braking or stopped and then quickly restarted once power is again required Mild hybrids may employ regenerative braking and some level of power assist to the internal combustion engine ICE but mild hybrids do not have an electric only mode of propulsion 1 2 3 Contents 1 Overview 2 Advantages and disadvantages 3 Examples 3 1 General Motors 3 2 Honda 3 3 Others 4 See also 5 ReferencesOverview EditThis section does not cite any sources Please help improve this section by adding citations to reliable sources Unsourced material may be challenged and removed December 2016 Learn how and when to remove this template message The mild hybrid s electric motor provides greater efficiency through the use of a single device that is essentially an integrated starter alternator sometimes known as a generator motor unit A typical mild hybrid setup uses a belt powered generator motor unit driven off the engine to supply power to a small battery The generator is also powered through regenerative braking enabling power that would otherwise be dissipated as heat to be recaptured and recovered for use in powering the vehicle The small power assist generated by mild hybrid systems can help supplement the gas engine in low speed situations or handle the demands of engine start stop functionality Vehicles equipped with a mild hybrid system typically see anywhere from a 1 4 miles per gallon improvement in fuel economy relative to comparable models without the technology 4 Mild hybrids do not require the same level of battery power and do not achieve the same levels of fuel economy improvement as compared to full hybrid models One example is the 2005 07 Chevrolet Silverado Parallel Hybrid Truck PHT a full size pickup truck with a single 7 kW 3 phase electric motor mounted in the bell housing between the engine and a conventional 4L60E transmission Chevrolet was able to get a 10 improvement on the Silverado s city fuel efficiency by shutting down and restarting the engine on demand and the reduction of parasitic accessory loads However the PHT had no power assist features or all electric electric vehicle EV capability and very limited regenerative braking features citation needed Advantages and disadvantages EditThis section does not cite any sources Please help improve this section by adding citations to reliable sources Unsourced material may be challenged and removed October 2020 Learn how and when to remove this template message Compared with a full hybrid vehicle mild hybrids may provide some of the benefits of the application of hybrid technologies with less of the cost weight penalty that is incurred by installing a full hybrid series parallel drivetrain Fuel savings would generally be lower than expected with use of a full hybrid design as the design does not facilitate high levels of regenerative braking or necessarily promote the use of smaller lighter more efficient internal combustion engines Examples EditGeneral Motors Edit General Motors mild hybrids including the Parallel Hybrid Truck PHT and numerous cars and SUVs equipped with the BAS Hybrid system often use a 36 to 48 volt system to supply the power needed for the startup motor as well as a source of power to compensate for the increasing number of electronic accessories on modern vehicles 5 GM s belt alternator starter BAS mild hybrid system uses a belt drive to start the internal combustion engine ICE through its motor generator unit MGU then once started the engine drives the 14 5 kW motor generator to charge the batteries The BAS hybrid system also utilizes regenerative braking to replenish the system s 36 V battery and can provide moderate levels of power assist According to the EPA a 2009 Saturn Vue Greenline equipped with the BAS Hybrid system delivers a 27 improvement in combined fuel economy over the non hybrid version FWD 4cyl 6 Honda Edit This section does not cite any sources Please help improve this section by adding citations to reliable sources Unsourced material may be challenged and removed December 2016 Learn how and when to remove this template message Honda s Integrated Motor Assist directly attaches a brushless DC motor between the flywheel and transaxle providing both assistance during acceleration and regeneration during coasting braking It has been produced in various voltages and power outputs as dictated by the size and weight of the vehicle application Models equipped with the Integrated Motor Assist include the Honda Insight 1999 2006 2009 2014 Honda Jazz 2011 Honda Civic 2003 2015 Honda Accord 2005 2007 and CR Z 2010 2016 Others Edit Toyota Crown Sedan Super Deluxe Mild Hybrid During the 2008 Olympic Games in Beijing in August Chinese automobile manufacturer Chang an Motors supplied a number of hybrid drive cars as taxis for the athletes and spectators The power electronics for the mild hybrid drive was supplied by Infineon 7 Toyota sold mild hybrid versions of the Toyota Crown executive sedan between 2001 and 2003 and the mid size Crown Sedan between 2002 and 2008 in the Japanese domestic market 8 9 These models combined a BAS hybrid system with the standard straight 6 petrol engines for increased fuel economy Toyota now sells a full hybrid version of the Crown under their brand name Hybrid Synergy Drive MINI and BMW have start and stop and some with regenerative braking in all of their vehicles sold in Europe running 4 cylinder engines with manual transmissions Citroen proposes a stop and start system on its C2 and C3 models 10 The concept car C5 Airscape has an improved version of that adding regenerative braking and traction assistance functionalities and ultracapacitors for energy buffering 11 In 2004 VW brought two mild hybrid concept cars to Shanghai for the Challenge Bibendum 12 Suzuki have announced the Suzuki Baleno with integrated SHVS technology in 2016 on the new Suzuki HEARTECT platform Suzuki has had experience with this mild hybrid technology in their Suzuki Ciaz See also EditBAS hybrid eAssist Integrated Motor Assist Micro HEVReferences Edit Pilot Project MOVELE An initiative of the IDAE in favour of energy efficiency in transport PDF Archived from the original PDF on 2009 05 30 Retrieved 2013 08 09 Sam Abuelsamid 2009 04 03 What is a mild hybrid AutoblogGreen Retrieved 2010 03 22 Maruti Suzuki Ciaz Hybrid SHVS working All you need to know Indian Car News 2015 08 25 Retrieved 2017 01 01 https x engineer org mild hybrid electric vehicles mhev types MIT Industry Consortium on Advanced Automotive Electrical Electronic Components and Systems 17 September 2004 Archived from the original on 17 September 2004 Compare Cars Side by Side Fueleconomy gov Retrieved 2017 01 01 News Electronics EETimes Eetimes eu Retrieved 2017 01 01 History of Toyota 75 years Crown vehicle lineage Toyota Retrieved 2022 01 27 The Widespread Introduction of the TOYOTA Mild Hybrid Cars HEV May Promote an Earlier Introduction of 42V Cars 23 October 2009 Archived from the original on 23 October 2009 Citroen com the International website of Citroen Citroen com Archived from the original on 2013 10 29 Retrieved 2017 01 01 Citroen com the International website of Citroen Citroen com Archived from the original on 2013 10 29 Retrieved 2017 01 01 VW Brings Diesel Mild Hybrid Concept to Shanghai Green Car Congress 2004 10 13 Retrieved 2017 01 01 Retrieved from https en wikipedia org w index php title Mild hybrid amp oldid 1120465419, wikipedia, wiki, book, books, library,
