I always just sort of assumed they dump fuel either way, but it isn't something I've given much thought to. Today’s tip probably won’t help you save much on gas (unless it gets you to start doing a better job of anticipating driving conditions), but it will help to keep you safe while you’re coasting down the road. The results have demonstrated that fuel consumption can be reduced about 7.9% through the proposed approach when the vehicle coasts on the flat road.

Here, the revised algorithm is employed and constraint is introduced on the velocity which allows the vehicle velocity to go higher/lower than the cruising velocity rather than following the constant velocity. Because you must pay better attention to your driving, you must drive slower and you must leave more space between you and the car in front of you. Payman Shakouri, Andrzej Ordys, Paul Darnell, Peter Kavanagh, "Fuel Efficiency by Coasting in the Vehicle", International Journal of Vehicular Technology, vol. The engine idle speed is introduced as the set-point.

If I drive a constant 60 miles per hour I average 30 miles per gallon on the highway. Section 3 proposes a new approach for increasing the coasting duration.

If you're wanting to keep that energy for going up a subsequent slope, it's better to freewheel for the short time you're on the down slope, as the energy required for a similar amount of acceleration to get you as far up the hill coming up is going to be greater than what you used by idling for a short time. This content is created and maintained by a third party, and imported onto this page to help users provide their email addresses. The magnitudes of the impeller torque and throttle opening are acquired by the switching algorithm (see Figure 4). What do you need from a virtual open day? Slight downhill (just enought to keep car coasting in neutral at 70 km/h), Neutral: 0.1-0.2 litres/10km Figure 10 shows a histogram of data for two different journeys, called “Out_1a” & “Ret_1a”, with standard and revised (TC3) strategies.

Is it possible to get double flashed by a speed camera and not get a ticket? Some studies suggest that the old 55-mph limit saved fuel but cost us more in terms of lost work hours. FedEx does it, and the MythBusters proved it works: When city driving, make as many right turns as possible, even if it means going a few hundred yards out of the way. If the engine speed is retained low, the engine losses will be reduced and subsequently the tractive torque will be increased, enabling the vehicle to remain moving for longer duration while coasting.

Reduce the miles you drive by running all your errands in one trip. ), but they're inherently wasteful: They take the kinetic energy of a moving car—energy it took pricey gasoline to generate—and turn it into heat that's lost to the air. Parameters playing an important role in the performance of a torque converter are the speed ratio (), the torque ratio (), the efficiency ), and the capacity factor or -factor (), where is the impeller torque (converter input torque), is the impeller speed (converter input speed), is the turbine torque (converter output torque), and is the turbine speed (converter output speed).

Cost to repair scratch on my car?!!? Point is: At 80 km/h, it ‘cost’ 0.2 litres/10km to keep the engine revving without being connected to the wheels. – Besides requiring more of the brakes, coasting has little effect on the vehicle. This may seem counterintuitive, but that's what data are for—replacing good guesses with solid facts.


The lower engine friction causes fuel consumption to decrease (Figure 8(g)).
To settle the long-standing question of whether it's better to coast along in neutral or in gear, we tapped into the fuel injection harness on the engine, hooking up to an oscilloscope to capture the opening and closing of the injector. indicates the transmission input torque while the torque converter is unlocked. I don’t agree with the safety aspect much, however the real point to coasting in gear is that in a modern engined electronically injected car, when the wheels are turning the engine (i.e. Problems with getting the vehicle back into gear when over speeding, and problems with over revving should you choose the wrong gear.

Is it normal for the temp gauge to go past half way slightly ? 3. This does cause folks to group up behind me, but it is not serious. By neglecting distortion and damping effect of the rotating part, the engine speed () will be identical to the transmission input speed (). In order for the magnitude calculated by the controller to be used, the following two conditions must hold at the same time:(1)throttle signal is zero;(2)the vehicle speed is less than 15 km/h. If the incline is steep enough you will maintain or even gain speed, if not you will lose speed. Crunching the Numbers on Alternative Fuels, Is Fracking Safe? Distributed by Tribune Content Agency, LLC, © 2020 The Philadelphia Inquirer, LLC Terms of Use/Privacy Policy, Under the Hood: Renewing brake fluid every few years is important, Under the Hood: Simple gas cap tightening could resolve otherwise complicated issue, Under the Hood: Use warm, conditioned air to defrost your windows. Don't make separate outings. Any torque applied to the wheels brings them closer to skidding, therefore leaves less grip available for cornering, while engine braking in a non-all wheel drive vehicle places additional torque on some wheel and means that the non-driven wheels will generate sub-maximal braking force.

I do not recommend doing this all the time becsuse it can be hard on the transmission if not done properly.

I believe it’s called a series hybrid. Tell us a little about yourself to get started. Furthermore, even with no speed deviation, a fuel economy benefit is realized due to longer coast duration. If you coast in gear you will slow your car down at the expense of kinetic energy. A: This is fun stuff. Fuel efficiency has been widely researched in the literature from different aspects.

[13] propose Stop/Start Coasting, that is, the Bosch concept, in which the fuel injection is turned off during the coasting; however, the combustion engine must be decoupled from the powertrain by opening the clutch or shifting into neutral gear in order to avoid negative engine torque during coasting. This uses the momentum of the car to keep the engine running, rather than using up fuel; therefore, more fuel efficient to keep it in a gear. Driving without coasting: 19.5 mpg city/hwy On contrary to [3] which has stated that the greatest fuel efficiency could be achieved by fully locking-up the torque converter, in this paper it has been demonstrated through the simulation that the fuel efficiency can be increased by controlling the slip between the components of the torque converter, that is, the impeller and turbine, through the torque converter slip control when the vehicle is in the coast phase. Almost always. Carburetors weren't very smart when it came to deceleration. Or, you can just be in gear and then downshift to accelerate quickly. I’ve got a Manual 5 Speed Mazda Familia Break – Year 2001, 1500CC, Fuel Injected Engine of Course. Additionally, you’re vehicle will have much better handling if the car is in gear. My dad says that if you coast down a hill in a car it actually uses up more fuel than if you put it into top gear, let off the accelerator. Barrand and Bokar [1], Tarpinian et al.

real road profile, which is used to emulate a real-world driving condition. We’re thinking about when you were lifting couch cushions for spare change. Here's the surprise: There's no tradeoff between safety and fuel economy in this case. To engage neutral while moving forward in any acceleration or deceleration state is as simple as pushing forward on the shift stick. AS further maths mechanics vs probability and statistics. and denote the friction and pumping losses, respectively. Do you coast for economy? De Jager, D. Foster, and M. Steinbuch, “Velocity trajectory optimization in Hybrid Electric trucks,” in, A. Rousseau, S. Pagerit, and D. W. Gao, “Plug-in hybrid electric vehicle control strategy parameter optimization,”, D. Sinoquet, G. Rousseau, and Y. Milhau, “Design optimization and optimal control for hybrid vehicles,”, E. Hellström, M. Ivarsson, J. Åslund, and L. Nielsen, “Look-ahead control for heavy trucks to minimize trip time and fuel consumption,”, P. Kock, H.-J. In order to investigate the influence of the revised algorithm on the coasting duration along with fuel efficiency two scenarios based on the road condition are determined: flat road and inclined road. Transition may occur between the two states of the torque converter; locked and unlocked states. (As the graph above shows, the hit to fuel efficiency is roughly twice as severe in the higher range.) The reason putting the car in neutral is unsafe is now you don’t have the ability to “hit the gas” if for some reason you had to make an evasive move.  For example, as you’re coasting, something comes out in front of your car (another vehicle, an animal, a person, it doesn’t matter) and you need to get over into the other lane quickly.  If your car is in neutral, you’re going to slam on the gas expecting to quickly accelerate, only you’re not going to go any faster. Never coast through an intersection while making a turn (problems with regularity in driving habits). What do I need to add to this post to make people want to quote it?

In this way, the engine friction losses can decrease which causes fuel efficiency to be improved. Thereby, refueling the engine at lower vehicle speed provides further improvement on the coasting duration. I find this hard to believe, because if my car is going downhill for 60 miles at 60 mph in neutral it would only use one gallon.

In order to take into account the effect of rotating part on the vehicle dynamics, the moment of inertial of the wheels has to be lumped with the vehicle mass: where denotes the moment of inertia of a wheel, indicates the number of the wheels, the mass of the vehicle, and the wheel radius. Section 5 illustrates the simulation results for the coasting and investigates the potential of the fuel efficiency through the approach proposed in this paper. denotes the engine indicated torque.


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