Engine Dead in Reverse and on Stop but They Start It Again in Nuetral Position Ford 150

Some are almost unnoticeable, others make the motorcar shudder each fourth dimension they activate—only offset-end systems are hither to stay.

First rolled out in Europe and Asia, where crowded city driving requires cars to spend more fourth dimension at a standstill, they switch off the engine when the car's non moving.

When the driver starts to lift a foot off the brake pedal, they quickly restart the engine in time for the machine to motility away from a stoplight or traffic jam.

DON'T MISS: Outset-stop systems to soar in number over adjacent decade

Most such systems already keep the car's accessories—lights, wipers, sound organization, climate control—operating every bit standard.

That limits the amount of time the engine can remain off, by and large to a period betwixt 45 and 90 seconds.

But in stop-and-get traffic, that's often enough to relieve significant amounts of fuel.

Ford Motorcar Start-Stop fact sheet

Starting time-cease systems were slower to come up to the U.South., in part because they didn't provide much advantage even in the EPA's city-driving test wheel.

Several years ago, Mazda's Robert Davis suggested that the advantage might corporeality to 0.1 mpg on the EPA urban center wheel, an improvement that could be accomplished at less cost using dissimilar technologies.

Simply the main question most car buyers have about new start-stop systems is: won't they vesture out my car's starter motor?

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The reply is no.

For an explanation of why, we reached out to a source in the auto industry who's had a great deal of experience with these systems.

This person asked that we proceed him anonymous for a variety of reasons, among them that his current employer hadn't approved his comments.

2013 Ram 1500 - engine first-stop system

"Automotive engineers don't employ 'traditional' starter motors in these situations," he explained. "The starter used for kickoff-stop systems combines several technologies."

What follows is his caption of those technologies, lightly edited by Dark-green Car Reports for clarity and style.

(1) The gear ratio from the starter-drive pinion to the flywheel ring gear is optimized to make the starter's motor plow more slowly. This can be done without materially changing the design of the manual or flywheel at all on existing designs.

WE EXPLAIN: How Practise Yous Make Showtime-Stop Systems More Pleasant For Drivers? (May 2014)

Crucially, this reduces starter-motor speed (in RPM), since 90 per centum of starter-motor brush vesture occurs non during cranking, but during the declension-down subsequently the start has finished. If a higher-torque motor can spin more slowly, its coast-down time is shorter, increasing its longevity.

Pushbutton start

(two) The limerick of the carbon and copper brushes on a start-stop motor differs from its traditional counterparts to increase longevity without accelerating the wear on the commutator.

(3) Rather than rely on oil-impregnated bushings for the rotating assemblies, start-stop starters mostly use needle bearings.

(4) The solenoid on start-stop starters decouples the mechanical activity of engaging the bulldoze pinion into the flywheel from the electrical action of stopping and starting the motor.

This allows for a defended design to turn ability on and off to the motor, optimizing contact design and wear, against contacts that take to be integrated as part of a spring-loaded plunger.

This also reduces the electrical load requires to turn the engine, so that at that place is enough current available for accessories/lighting to operate during the beginning consequence.

(v) Finally, beginning-stop motors are integrated with other technologies that place when each cylinder of the engine volition attain top-dead center.

READ THIS: 2016 Cadillac Start-Stop Systems To Use Ultracapacitors To Augment Batteries (Sep 2015)

That lets the fuel injectors pulse and burn during the center of a complete rotation of the crank, against having to await for a complete revolution that lets the showtime cylinder reach that position to start the fuel-spark timing sequence.

And in that location yous have it: the total technical caption of why you lot don't need to worry about starter motors wearing out prematurely due to start-stop systems.

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Source: https://www.greencarreports.com/news/1109687_dont-start-stop-systems-wear-out-your-cars-starter