Mercedes Mullins
The auto stop-start feature in cars is designed to improve fuel efficiency by shutting off the engine when the vehicle is idling or at a stoplight, and then automatically restarting when the driver lifts off the brake or presses the accelerator. This technology has been available since the 1990s, but its effectiveness in saving fuel has been debated. While there is no definitive answer to how much fuel is saved, studies have shown improvements in fuel economy ranging from 2.9% to 26.4% depending on various factors such as drive cycles, idle time, and weather conditions. Some car manufacturers, such as Mazda, have also introduced technologies to ensure efficient and quick engine restart, addressing concerns about the strain on starter motors. Overall, while the auto stop-start feature may have varying levels of fuel savings, it is designed to reduce idle time and fuel consumption, with potential environmental benefits through reduced emissions.
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What You'll Learn
Auto stop-start reduces idle time and fuel use
The automatic start/stop function shuts off the engine when your car is idling, cutting fuel use and eliminating idle emissions. Auto stop-start reduces idle time and fuel consumption by temporarily turning off the engine when the vehicle comes to a halt and automatically restarting it when the brake is released or the accelerator is pressed.
The amount of fuel saved by using a start-stop system varies depending on the amount of idle time during a journey. A Transport Energy Emission Research study found that Australian passenger vehicles idle for about 20% of the time they are running, indicating that the fuel saved by using a start-stop system could be significant.
Experiments have been conducted to determine the fuel economy effects of using the auto stop-start feature. Four vehicles were tested with and without the feature under three test cycles: the Federal Test Procedure (FTP) city fuel economy test, the US06 high acceleration aggressive driving schedule, and the EPA New York City Cycle (NYCC). The results showed that the fuel economy improvement varied significantly between drive cycles, with the largest improvements being 7.27% for the FTP and 26.4% for the NYCC.
In addition to reducing fuel consumption, auto stop-start can also help to reduce emissions. By eliminating idle emissions, auto stop-start can help to improve air quality and reduce the environmental impact of vehicles.
While auto stop-start can provide fuel savings and emissions reductions, there are also some potential drawbacks. Some people find the start-stop function annoying, and there may be additional maintenance costs associated with the system. Additionally, manually stopping and starting your car in traffic can damage the engine if it is not designed for start-stop functionality.
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The longer you sit, the more fuel you save
The automatic start/stop function on a car shuts off the engine when the vehicle is idling, such as at a stoplight, and turns it back on when you release the brake or press the accelerator. The longer the engine is off, the more fuel you save.
This technology has been around since the 1990s, but it's becoming more common on new cars. It's designed to improve fuel economy and reduce emissions. The amount of fuel saved depends on how much time is spent sitting idle in traffic. A Transport Energy Emission Research study found that Australian passenger vehicles idle for about 20% of the time they are running.
One test of a Mini Cooper found that with the automatic stop-start feature turned on, fuel economy improved from 30.0 to 30.9 mpg, a savings of 2.9%. With the air conditioning off, savings shot up to 9.5% at 33.2 mpg. Another test of four vehicles found fuel economy improvements of 7.27% and 26.4% for the Federal Test Procedure (FTP) city fuel economy test and the EPA New York City Cycle (NYCC), respectively.
Some drivers find the start-stop system annoying, and some question whether it saves enough fuel to be worth the cost. However, it's important to note that constantly stopping and starting your engine can damage its parts, and auto manufacturers have designed engines with this in mind.
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Start-stop systems are now available on non-hybrids
The start-stop system is a technology that improves fuel efficiency by shutting off the engine when the vehicle is idling or at rest, such as at a stoplight, and automatically restarting when the driver lifts off the brake or presses the accelerator. This technology was originally developed for hybrid electric vehicles, but is now available on a range of conventional vehicles without hybrid powertrains.
The system works by automatically shutting off the engine when the vehicle is idling, thereby reducing fuel consumption and eliminating idle emissions. The engine then restarts automatically when the driver lifts off the brake or presses the accelerator. The basic logic behind the system is that if a vehicle is idling, it is wasting fuel.
The start-stop system was first introduced in the 1980s by Volkswagen, and has since been adopted by other manufacturers including Toyota, Mazda, Ford, General Motors, Honda, Jeep, BMW, Mercedes-Benz, Mitsubishi, and Porsche. In 2015, almost every major automaker offered models with start-stop idle control. Experts predict that this technology will become even more prevalent, with over half of all vehicles sold in the US expected to be factory-equipped with start-stop systems.
The reported fuel economy improvements for non-hybrid vehicles with start-stop systems range from 3% to 12%, with some estimates as high as 26.4% depending on the drive cycle. In addition to improved fuel efficiency, start-stop systems can also improve air quality and reduce pollution by cutting down on emissions from idling vehicles.
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Fuel savings depend on idle time during a journey
The automatic start/stop function in cars improves fuel economy by shutting off the engine when the vehicle is idling. The function then restarts the engine when the driver lifts off the brake or puts in the clutch to select 1st gear. This technology is designed to handle the repeated starting and stopping of the engine.
The effectiveness of the start-stop system in saving fuel depends on the amount of idle time during a journey. An experiment conducted on four vehicles under three test cycles showed that the fuel economy improvement varied significantly between drive cycles, depending on the amount and percentage of idle time during the test. The largest fuel economy improvements were 7.27% and 26.4% for the FTP and NYCC, respectively.
The start-stop system can lead to modest fuel savings, such as a 2.9% improvement, with fuel economy climbing from 30.0 to 30.9 mpg. However, turning off the system and using the air conditioning can result in even higher savings of up to 9.5%, with fuel economy increasing to 33.2 mpg.
Additionally, the system can help protect the car engine by reducing idle time. Idling increases overall engine wear and causes the car to operate for longer than necessary. By turning off the engine instead of idling, drivers can also reduce hazardous pollution and improve air quality.
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Auto start-stop improves fuel economy in heavy traffic
With increasingly stringent regulations mandating the improvement of vehicle fuel economy, automotive manufacturers are under pressure to develop and implement technologies that improve overall system efficiency. One such technology is the auto start-stop feature.
The auto start-stop feature reduces idle time and fuel use by temporarily shutting off the engine when the vehicle comes to a stop and automatically restarting it when the brake is released or the accelerator is pressed. The basic logic is hard to argue with: why burn gasoline when your car is idling?
The fuel economy improvements of the start-stop function were found to be between 7.27% and 26.4% in fuel use during testing, according to the Society of Automotive Engineers (SAE). The improvement varies depending on driving conditions. For instance, if you’re constantly on the highway and the engine never shuts off, the fuel savings will be much lower. However, if you’re doing a lot of city driving with frequent idling, there is a legitimate reduction in fuel use with start-stop technology.
The start-stop system is especially beneficial for people who live in areas with heavy traffic and long wait times. The longer you sit, the more you save. For example, if your car usually manages 20 mpg in the city, it could earn 22 or 23 mpg if it had a start-stop system.
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Frequently asked questions
The auto stop-start feature shuts off the engine when your car is idling or at a standstill, cutting fuel use and eliminating idle emissions.
The auto stop-start feature automatically shuts off the engine when the vehicle is at rest, such as at a stoplight. The engine restarts when the driver lifts off the brake or engages the clutch to select 1st gear.
The amount of fuel saved by the auto stop-start feature varies depending on driving conditions and idle time. In certain test cycles, fuel economy improvements of up to 7.27% and 26.4% were observed. In real-world usage, the savings can be more modest, ranging from 2.9% to 9.5%.
The auto stop-start feature is commonly found in hybrid vehicles but has recently been introduced in vehicles with conventional gasoline engines. It is also available in some mild hybrid vehicles, which use a small electric motor to assist the gas engine.
Some drivers find the auto stop-start feature annoying due to the calibration of the system. There may also be concerns about additional maintenance costs and potential strain on the starter motor, battery, and engine. However, automakers have considered these factors, and modern starter motors are designed to handle the repeated starting and stopping of the engine.
