Hill-holder

Hill-holder is a name for the mechanism invented by Wagner Electric and manufactured by Bendix Brake Company in South Bend, Indiana. It is a device that holds the brake until the clutch is at the friction point, making it easier to start up hills from a stop in manual transmission automobiles. Hill-holder works by holding the brake in position while the driver sets-up and activates the first gear to move the car forward from a complete stop, without fear of roll-back.

It was first introduced in 1936 as an option for the Studebaker President. By 1937 the device, called "NoRoL" by Bendix, was available on Hudson, Nash and many other cars. Studebaker[1] and many other carmakers offered the device as either optional or standard equipment for many years. In modern usage, this driver-assistance system is also called hill-hold control (HHC), hill-start assist (HSA) or hill-start assist control (HAC).

Availability

As a trade name, it was introduced by Studebaker in the 1936 President. It was also promoted by Studebaker as an option in the 1939 model year. Later, the technology became available on a variety of modern automobiles, starting with the 2005-onwards Volkswagen Passat, 2011-onwards Volkswagen Jetta, and 2004-onwards Volkswagen Phaeton and Touareg. It is further available on the Subaru Forester,[2] Subaru Impreza and Subaru Legacy. The 2009 Dodge Challenger SRT8[3] also comes equipped with hill-holder.

Similar systems are or were in use by Alfa Romeo, Citroën, Fiat (including the new Fiat 500), BMW, Skoda Superb 2009, Lancia, Mercedes-Benz, Volkswagen, Lamborghini Aventador, Saab, smart ("Hill Start Assist"), Subaru, Cadillac ("NoRol") and Stutz ("Noback").

The mechanism was available in American car parts stores so that car owners could add to their vehicle to improve it from the late 1930s through the 1950s. But it required that the car have hydraulic brakes, so it could not be added to Ford Motor Company products before 1939. In 1949 it became available on factory-built Fords.

Cars with hill-holder feature:

MakeModelYearCommentReference
VinFastFadil
LUX A2.0
LUX SA2.0		2019[4]
[5]
[6]
SubaruOutback2003-2014above
SubaruImpreza2003above
SubaruLeone1984-1994above
SubaruLegacy1989-2015above
SubaruForesterJuly 2005above
SubaruVortex (XT)1985-2001above
DodgeChallenger SRT82009[3]
Alfa Romeo1592005[7]
Fiat500 Sport2011[8]
FordFiesta2012-Current[9]
ChevroletSonic2012[10][11]
HondaCR-Z2012Called "Hill Start Assist"[12]
HondaFit and Fit Hybrid2015 (NOT 2013)[13]
ChevroletSpark2013Called "Hill Start Assist"[14]
Mercedes-Benz SmartForTwo2011Called "Hill Start Assist"[15]
Mercedes-BenzGL3202008[16]
Mercedes-BenzM-Class2012[11]
MINICooperPart of Dynamic Stability Control[17]
ToyotaRAV4EV2012-2014Called "Hill-start assist control"[18]
VolkswagenPassat2012[19]
AudiA32012[11]
KiaKia_Soul2012+Called "Hill Start Assist" [11]
MazdaCX-3,5,72013+[20]
BMW5-Series2012Called "Drive-off assistant" [11]
MahindraE2O2013electric car[21]
Lada Vesta 2015 - current
BMW 3-Series 2007+ Called "Drive-off assistant" [22]

Operation

In layman’s terms, the modern hill-holder function works by using two sensors, in concert with the brake system on the vehicle. The first sensor measures the forward-facing incline (nose higher than tail) of the vehicle, while the second is a disengaging mechanism. The 1930s-1950s NoRoL used a ball bearing as a check valve in the hydraulic brake line; when the car was on an uphill incline, the ball rolled back and blocked the brake line - when the car was level or facing downhill, the ball rolled away, leaving the line free. The clutch linkage slightly dislodged the ball when the clutch was released, enabling the car to move away from a stop.

Manual transmission vehicles

When the driver stops the vehicle on an incline where the nose of the car is sufficiently higher than the rear of the car, the system is engaged when the driver's foot is depressing the brake pedal, and then the clutch pedal is fully depressed. Once set, the driver must keep the clutch pedal fully depressed but may remove the foot from the brake pedal. To disengage the system and move the car forward, the driver selects first gear, gently depresses the fuel pedal, and slowly releases the clutch pedal which at a point in its travel releases the braking system, allowing the car to proceed.

Usage

Hill-holder works best for those who are inexperienced with manual shift techniques, or in situations with heavy traffic in steep hilly conditions (as in San Francisco, or Duluth for example).

However the same technique can be accomplished by a driver through the use of the manual parking brake lever, coordinated with the brake, clutch, gear shift and accelerator. This is a standard technique in most countries where manual transmissions remain popular, for example the UK. Cars equipped with a parking brake pedal are not suited for this maneuver unless it is released by hand, for example in the Citroen XM.

gollark: You can muck with setmetatable and `__index` to do that, except it has the slight issue of making `pairs` not work as expected.
gollark: Alternatively, somehow put it in their environments.
gollark: On non-vararg ones, you can pass it as an argument after the other ones.
gollark: The `<boolean|string>` bit is a constraint then?
gollark: And rediS too.

References
  1. the Auto Editors of Consumer Guide. "HowStuffWorks "1939 Studebaker Champion Success"". Auto.howstuffworks.com. Retrieved 2011-01-22.
  2. "Subaru Drive Magazine: Summer 2002". Drive.subaru.com. Archived from the original on 2006-11-29. Retrieved 2011-01-22.
  3. "2009 Dodge Challenger SRT8". Driving Sports. 2009-07-15. Archived from the original on 2010-12-22. Retrieved 2011-01-22.
  4. Brochure Fadil
  5. Brochure A2.0
  6. Brochure SA2.0
  7. "Tenuta di strada: piacere di guida e sicurezza attiva". 2005-06-13. Retrieved 21 August 2018.
  8. "2012 FIAT 500 Long Term Road Test". September 26, 2011. Retrieved 22 November 2013.
  9. "Ford Fiesta Owner's Manual" (PDF). Retrieved 18 June 2016.
  10. Marc Carter (December 22, 2011). "REVIEW: 2012 Honda Fit is "Fit" for the City". Retrieved 22 November 2013.
  11. http://www.thecarconnection.com/news/1065989_2012-family-cars-with-hill-hold-assist. Retrieved 30 November 2013. Missing or empty |title= (help)
  12. http://owners.honda.com/vehicles/information/2013/CR-Z/features/Hill-Start-Assist. Retrieved 22 November 2013. Missing or empty |title= (help)
  13. https://web.archive.org/web/20131202234605/http://world.honda.com/news/2013/4130905New-Fit-and-Fit-Hybrid/. Archived from the original on 2 December 2013. Retrieved 22 November 2013. Missing or empty |title= (help)
  14. http://www.roadandtrack.com/car-reviews/first-drives/2013-chevrolet-spark. Retrieved 22 November 2013. Missing or empty |title= (help)
  15. https://web.archive.org/web/20140819102839/https://www2.smart.com/no/no/index/smart-fortwo/passion.html. Archived from November 2013 the original Check |url= value (help) on 2014-08-19. Missing or empty |title= (help)
  16. http://www.autotrader.com/dealers/dda/index.jsp?dealership_view_name=vincewhibbs&dealer_id=94097&car_id=352340625&address=. Retrieved 22 November 2013. Missing or empty |title= (help)
  17. "MINI Cooper Features". Retrieved 17 January 2017.
  18. "2014 Toyota RAV4EV Owners Manual, page 256" (PDF). Retrieved 25 May 2018.
  19. http://api.miniusa.com/top-feature-cooper-coupe-dynamic-stability.html. Retrieved 30 November 2013. Missing or empty |title= (help)
  20. http://www.cardinalewaymazdacorona.com/blog/mazda-mx-5-hill-hold-assist-feature/. Retrieved 30 November 2013. Missing or empty |title= (help)
  21. Mahindra Electric - Pioneers Of Electric Mobility In India
  22. "BMW 2007 Owner Manual" (PDF). BMW. 2006.
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