auto start stop technology

Start-stop technology in cars

Start-stop technology activation is based on certain driver inputs and operational circumstances. The engine needs to be at the right temperature for the catalytic converter to light up properly, for optimal lubrication, and for the smoothest restart possible. Due to disparities in the legislative framework, start/stop technology initially appeared in Europe. The New European Driving Cycle (NEDC) has an idle time of 25%. Comparatively, the United States Environmental Protection Agency (EPA) test only spends about 11% of its time idle.

When a manual-gearbox car has stopped completely, the gearbox is usually in neutral, and the clutch is released. Automatic transmission cars shut off when the automobile comes to a complete stop; the foot brake pedal must be depressed at that moment for the shutdown to occur. The engine won’t shut off if the car is first slowed manually using the automatic gearbox and then stopped completely using the handbrake. well in this article we’ll be discussing all questions related to the start-stop technology in cars.

auto start stop technology

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  • What is start-stop technology?
  • How does start-stop technology work?
  • what are the benefits of start-stop technology in cars?
  • What is the negative effect of start-strop technology?
  • What are instances when my Auto Stop may not occur and/or my Auto Start may occur?
  • Which car manufacturing companies apply the start-stop technology?

so, let’s begin!


What is start-stop technology?

In order to decrease the length of time the internal combustion engine is left running idle, a car’s start-stop Technology or stop-start system automatically shuts down and restarts the engine. This lowers fuel consumption and emissions. This is most helpful for cars that frequently stop in traffic jams or have to wait for long periods of time at traffic signals. As government fuel economy and pollution rules become more strict, start-stop technology may become more prevalent. This feature can be seen in hybrid electric vehicles, but it has also been seen in some non-hybrid electric vehicles. Gains in fuel efficiency for non-electric vehicles from this technology are normally in the range of 3–10%, and they could even reach 12%.

The start-stop system’s basic premise is that fuel consumption and emissions can be decreased if the engine is shut off for brief intervals, such as when waiting at traffic lights. The automatic start-stop technology contributes to fuel efficiency and environmental protection in this way. CO2 emissions can be decreased using this method by 3 to 8%. The advantages to the environment and increased efficiency have sped up the adoption of automated start systems across all vehicle classes. Automakers are also progressively integrating intelligent start-stop technologies into their lineups in response to the more strict EU restrictions on the pollutant emissions of motor vehicles.

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How does start-stop technology work?

  • The start-stop system recognizes when the automobile is stationary and uses sensors to make a number of different decisions about the vehicle’s operating mode.
  • The start-stop function shuts off the engine when the driver shifts the transmission into neutral when stopped at a stop sign.
    In some more current versions, if the speed drops below a particular point, the engine may even shut off.
  • All electrical consumers and helpers continue to receive electricity despite the engine, which serves as the main source of power for all systems, being turned off.
  • The vehicle’s battery provides for this. The engine is restarted by the automated start-stop system as soon as the clutch is engaged.
  • The automatic start-stop mechanism in cars with automatic or dual-clutch transmissions reacts to brake application alone. The engine will shut down automatically if the brakes are applied to bring the car to a stop while the driver’s foot is still on the pedal. The automated system restarts the engine when the brake is let off.

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what are the benefits of start-stop technology in cars?

This lessens pollutants: Even while your vehicle is still, it continues to emit hazardous carbon emissions when it is idling. Even if you might just be still for a short while, any drop in pollution is beneficial. If all vehicles adopted this technology, carbon emissions, which are increasingly a problem in many towns and cities, would be significantly reduced.

Quieter cars: Even if it won’t be much, start-stop technology will save fuel. It all adds up in the long run.

Fuel is saved: Because the engine won’t be running constantly when your car is still, the trip will be quieter and more serene.

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The price of replacement parts may be high: The Start-stop technology needs strong components. These parts can be more expensive, even though their lifespan shouldn’t be any shorter than that of those in a typical car.

Some individuals dislike the experience: The start-stop technology can feel uncomfortable to some people, and it can take some time for people to completely grasp how it operates and trust it.

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What are instances when my Auto Stop may not occur and/or my Auto Start may occur?

  • The motorist has let off the brake pedal.
    The vehicle has not yet achieved the minimum speed between Auto Stop incidents.
    The transmission or engine has not warmed up enough.
    The temperature of the ambient air is not within the necessary working range.
    The vehicle’s air conditioner or heater must be operational for the cabin to be cooled or heated.
    Out of DRIVE is selected on the transmission. Exception: Some automobiles permit the maintenance of an Auto Stop when in PARK.
    Charge up the vehicle’s battery.
    The battery of the car was recently unplugged.
  • The duration of the Auto Stop has exceeded the allotted time.
    The hood of the car is open.
    The motorist has depressed the gas pedal.
    To preserve optimal performance, some driving modes (such as 4 Lo or Track modes, if installed) may prevent Stop/Start.
    If the functionality included a Stop/Start disable option, you had already disabled it.
    To ensure maximum vehicle performance, other factors could prevent Auto Stop from occurring or cause Auto Start to occur.

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Which car manufacturing companies apply the start-stop technology?


As part of its Efficient Dynamics brand, BMW is integrating the technology across a number of its vehicles, including the MINI range, for 2008. BMW advanced the technology because the corporation was looking for ways to lower parasitic losses on engines. Robert Bosch GmbH created an improved starting, a conventional starter that can survive the increased number of engine starts in a stop-start car, therefore BMW chose to utilize it in place of an Integrated starting Generator (ISG).

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Ford said around the end of 2010 that its start-stop technology, which was previously utilized in its hybrid vehicles as well as a number of popular models in Europe, will be made available in North America beginning with the 2012 models, initially with 4-cylinder engines before spreading to V6s and V8s. All cars made by Ford will eventually have the system.

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Since 1999, Honda has used the start-stop technology on their IMA mild hybrid system in first-generation Insight cars sold in the domestic Japanese market, and more recently on the Civic Hybrid.

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Nissan’s micro-hybrid system is marketed under the S-Hybrid (stylized “S-HYBRID” in all caps) name. There is no need for a traction battery because the S-Hybrid system is entirely housed inside the engine compartment. An Energy Control (ECO) motor, which serves as both the alternator and starter motor for the gasoline engine, is a feature of cars with the S-Hybrid system. Instead of having an alternator that is always being operated, these vehicles include an auxiliary “sub-battery” that is housed in the engine compartment that powers the electric accessories when the gasoline engine has stopped. The ECO motor is powered as an alternator to retain a “sub-battery” charge when the driver releases the brakes or pulls off the throttle. besides being used to start the engine again.

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The i-Stop technology, which was developed by Mazda, determines which piston is in the ideal position to restart the engine the quickest. At this point, air and gasoline are present in the cylinder and prepared to be ignited. With the help of the starter motor, the spark plug ignites the mixture in this cylinder, driving the piston down, and resulting in an almost immediate engine restart time of 0.35 seconds.

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The Hyundai Accent/Verna, which was also recently revised for 2012, shares a new direct-injected four-cylinder 1.6 L engine with the Kia Rio and Rio5, but Hyundai did not mention this feature in their Accent line. In Israel, the Hyundai 1.4 manual has the ISG (Intelligent Stop & Go) technology.

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others include;

  • Jaguar
  • Kia
  • Citroën


Can the auto start-stop technology be turned off?

It is possible to temporarily disable Auto Start-Stop. Press the Auto Start-Stop Off button on your instrument cluster to turn the function off. You must deactivate it every time you start your car because this is not a permanent modification.

What is the downside to the start-stop engine feature?

The biggest drawback of a start-stop feature on a car is that you could have to pay more for a new car battery. You must be sure to replace it like for like even if you won’t necessarily need to do it more regularly.

What are the benefits of auto start-stop?

Start-Stop technology can produce fuel savings of up to 15%, depending on driving style. However, a variety of circumstances, including the area of use, affect the system’s efficacy. The automatic Start-Stop feature causes the engine to shut off at a stop during urban use.

What is Toyota’s stop-start technology?

When your car stops completely at a red light, the Toyota Start-stop technology will momentarily turn off your engine and put it into standby mode. The emission will go down and MPG will go up when the engine is turned off.

Does auto start-stop affect AC?

Modern air conditioning compressors, which are powered by electrical rather than the car’s engine’s mechanical drive, allow many Start-stop equipped cars to continue to circulate cool air for a brief period of time even when the engine is shut off.

How do I permanently turn off auto start-stop?

You can still disable this feature even though it cannot be turned off permanently. The “A Off” button next to your car’s gear shift can be used to pause or stop-start in a typical automobile.

Does auto start-stop have a battery?

Because these vehicles have higher demands than typical starter batteries, start-stop technology necessitates a battery with modern technology. Suitable battery technology is necessary for the electrical system architecture in modern vehicles to operate correctly and dependably.

Does the start-stop affect the battery?

When compared to their regular equivalents, vehicles with Start-stop systems require 5 to 10 times more engine starts. The battery of the car is under a lot of stress as a result.

What triggers auto start-stop?

When you let go of the brake pedal while driving normally, the engine will start up immediately. Before you let off the brake, the engine may automatically restart to maintain vehicle performance due to factors like the air conditioner, the battery charge, or other factors.

What causes auto Start-stop to fail?

It’s either too cold or too hot outside. Low battery power is present. The battery temperature is above or below what is ideal for operation. To maintain the interior climate and lessen fogging, the engine must be running.

That’s all for this article where the answers to the following questions were discussed;

  • What is start-stop technology?
  • How does start-stop technology work?
  • what are the benefits of start-stop technology in cars?
  • What is the negative effect of start-strop technology?
  • What are instances when my Auto Stop may not occur and/or my Auto Start may occur?
  • Which car manufacturing companies apply the start-stop technology?

hope it was helpful. if so, kindly share. Thanks for reading.