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Questions tagged [automotive-engineering]

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10 views

What is the rationale for a 6x6 truck chassis with 2 axles front vs. 6x6 chassis with 2 axles rear?

What is the rational for these two different 6x6 truck chassis arrangements? Is it merely a matter of intended distribution of weight across the chassis while in use? As in, two axles up front to ...
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1answer
23 views

Headlight auto-dimmer in newer cars

My RAM truck has a feature that intrigues me and I want to know how it works. In auto-dimmer mode, the truck will automatically put on low beams headlights when there is on-coming traffic at night, ...
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1answer
17 views

Max torque given in engine specification is indicated torque or brake torque?

I want to calculate brake torque from indicated torque for motorcycle.
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1answer
51 views

How don't dog clutches collide?

I'm learning about how dog clutches work particularly in sequential transmissions. I'm having a hard time understanding the principle which ensures dogs will always mesh correctly. I can easily ...
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1answer
30 views

Fastening rotating surfaces

This is probably very well explained but I'm lacking the terminology knowledge and that's keeping me from finding the information I need. I have a frame to which I need to attach a weight carrying ...
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0answers
45 views

How fast could a human pedal a car? [closed]

Suppose that we were to install bicycle pedals into a passenger car, say a civic coupe, in such a way that pedaling is as mechanically efficient as riding an ordinary bike. Further suppose that we ...
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3answers
48 views

Could an EV reverse to brake?

One of the benefits of electric cars is that many parts can be eliminated, simplifying the overall system. Could EVs eliminate brakes as well by slowing the car down using reverse torque from the ...
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1answer
33 views

What is the Source of the 10% Trailer Tongue Weight Recommendaton?

Throughout the trailer, hitch, and tow vehicle industry a recommendation of 10% tongue weight for a tow-behind trailer and 15% for a 5th wheel trailer seem universal. They have even been changed to 10%...
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0answers
31 views

What are the advantages of parallel pushrod configuration?

A topic that came up in a recent discussion was pushrod engines (specifically V2 configuration in a motorcycle) with four cams. After some googling, I was able to find an example in the Harley-...
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1answer
38 views

Why does a tractor not do wheelie with a lot of weight on the trolley?

Tractor carries more than his own weight on its trolley. The linkage between the tractor and the trolley is far away from the tractor. So, the whole weight of the trolley is on the back of the tractor....
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1answer
30 views

Inertial Forces while analysing forces on a Piston in a Slider - Crank Mechanism?

I get that we are analysing the Piston in a non-inertial frame of reference, but the point of my question is that according to D'Alembert's Principle, whenever an inertial force comes in the line of ...
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1answer
21 views

Can a car's Electronic Stability Control (ESC) operate using electromagnetic braking?

The Wikipedia article for ESC describes the process as using hydraulic anti-lock brakes. However, is it possible for electromagnetic braking to be used instead, with an electic motor/generator in ...
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1answer
29 views

Car's shock absorbers' damping ratio

I'm trying to find a suitable shock absorber for a small ATV with a specific value (to be determined later). But everywhere I look, no one seems to be giving the damping ratio of the shock absorbers. ...
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1answer
23 views

Efficiency of a fully-engaged friction clutch

I'm wondering whether there are any notable losses in a typical automobile clutch when fully engaged. Only losses that come to mind: material twisting with torque changes slipping due to imperfect ...
1
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1answer
17 views

Regarding rubber vibration properties

I read an article in a textbook which says stiffer rubber increases vibration damping and softer rubber increases vibration isolation. Can anyone explain this how? What is the difference between ...
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1answer
32 views

Regarding automotive engine mounts

How are automotive engine mounts tuned to behave differently for different frequencies, like they are soft for high frequency low amplitude vibrations and hard for low frequency high amplitude ...
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2answers
55 views

Why are tri-axle trailers with single wheels more stable than double wheels?

I'm revising for the UK LGV theory test. One of the questions goes something like this: Which axle configuration is most effective at preventing petrol tankers from rolling over? A. Tandem ...
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1answer
49 views

Get engine rpm using accelerometer

I'm studying the possibility to read an engine RPM by reading the vibrations of it. Basically an engine is "oscillating" on a car chassis on all 3 axes (X, Y, Z) but mostly on the Y one. When ignition ...
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1answer
26 views

Measuring Torque in a bicycle [closed]

How to measure torque in a bicycle? how much newtons will produce by the pedal of the cycle ?
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0answers
20 views

Calculation of reference vehicle speed using wheel speed sensors and longitudinal acceleration

I am curious why the speedometer in most passenger cars almost always uses the highest wheel speed, even if the rest of the wheels are stationary. Is this intended to be a safety feature of some sort? ...
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1answer
53 views

How can I connect F=ma to Drag=1/2*Cd*(rho)*V^2*A?

I previously posted a different question that was very vague. I have kept working on the problem, and now I have a different question. Please let me know if I should have just added it to the old ...
2
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1answer
71 views

Is it possible to move gear on a shaft in one moment and in the other allow it to rotate freely?

Before I describe the problem I would just like to say that I'm no engineer this is my hobby, all I know is from google or if someone told me or from books. Something obvious to you may not be obvious ...
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1answer
27 views

How does polygonal effect affect the effect of angular synchronization in car engines' timing train drive?

Is a regular roller train drive used in most car engine's timing chain drive? If so, wouldn't the polygonal effect affect the accuracy of strict angular synchronization between the camshafts and the ...
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1answer
33 views

Effect of Pressure on Combustion efficiency (of hydrogen) in excess air

Can somebody explain relation between combustion efficiency and pressure in lean mixtures using any kind of chart or mathematical equations? At first glance I thought, combustion efficiency increases ...
2
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0answers
29 views

Is there some temperature at which all “5w” oils should have about the same viscosity?

Is there some temperature at which all "5w" motor oils should have about the same viscosity? (5w-20, 5w-30, 5w-40, 5w-50, etc.) I am looking for SAE or ASTM wording or chart that says it straight ...
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2answers
43 views

Calculate engine oil pressure

How you would calculate engine oil pressure of an engine? I've noticed on my car I just got, it uses a pressure switch in the oil system to measure engine oil pressure it seems in my case the switch ...
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3answers
83 views

Will electroplating a ventilated brake rotor with copper improve its cooling capacity and maximum its lifespan?

Since copper is excellent at dissipating heat and does not rust, I am surprised that brake manufacturers do not electroplate cast iron/steel brake rotors with a thin layer of copper (~.5mm). There are ...
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1answer
82 views

Ackerman steering

I'm designing a steering mechanism following the Ackerman principle. I've met the condition that my steering arms' normal projections must cross in the middle of the rear axle however when I do a turn ...
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1answer
22 views

Is a starter relay needed to supply the current to the starter motor solenoid?

Considering the fact that the starter solenoid needs a maximum of 50 Amps initially (in order for the pinion gear to engage to the flywheel through the plunger and lever) and then some 8 Amps during ...
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1answer
28 views

Is starter motor running if I hold the ignition switch at the START position?

Suppose that the engine cranking has been successful but I keep holding the ignition switch at the START position instead of releasing the switch to go at the RUN position. Does this mean that the ...
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2answers
74 views

Bike wheel sizes

I was passing by a row of motorbikes and mopeds yesterday, and noticed they all have really small radius wheels compared to bicycles. Not all motorbikes are equal (some motorbikes are literally ...
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1answer
46 views

Car dc starter motor-starting resistor

Does a car starter motor use a starting resistor to limit the high starting current? What is the type of connection between field coil and armature? Series, parallel or mixed?
1
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1answer
34 views

Pacejka “Magic Formula” tire models origin of the name

It might be a little off topic but I'm trying to find source for why is that model called magic formula? I read that it's a simple function of commonplace functions, a data fitting. Is it simply an ...
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2answers
44 views

Pivoting trailer gate on multiple axes

I am currently trying to design a rear gate to retrofit to an existing caged trailer (similar to image 3), with the goal of having a system where the rear gate can pivot down (on its bottom edge) to ...
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1answer
42 views

Working of spider gear in differential axle wheel mechanism

What causes the spider gear to spin about it's own axis while the vehicle is taking a turn?
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1answer
49 views

What are the non-practical features of a sterling engine that cause the internal combustion engine to be used instead?

What are the non-practical features of a sterling engine that cause the internal combustion engine to be used instead (in a car)? (e.g. price, size, the power to weight ratio, etc.) Can you name any ...
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1answer
17 views

Calculate exhaust with expansion chamber muffler

I have a book with the formulas to calculate the length of engine exhaust pipe, but these formulas don't take into account the muffler. If I add an expansion chamber, how the calculated length change?
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0answers
22 views

PLEASE ANSWER Sterling vs Combustion Engine

This may be difficult to answer but, theoretically, if you had a car with a sterling engine that produces say approximately 300 horsepower how much of any specific heat source would need to be used if ...
0
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1answer
40 views

Calculate Rolling Resistance Experimentally

I am trying to calculate the exact rolling resistance ($F_{rr}$) of my car. The approach I am going with is a coastdown test at a low speed so no drag slows down the car. From there I am going to ...
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2answers
81 views

How can batteries in electric/hybrid cars charge at such a high rate?

If I were to look at "normal" batteries online, they often have charging C-rates of less than 1. However, with a car that uses regenerative braking, obviously such a low charging rate would not be ...
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2answers
54 views

How much power could a turbocharger generate?

I can find many figures online for the extra power generated when a turbo is fitted to an engine. However, I can't find any figures on how much energy the turbocharger turbine actually takes out of ...
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2answers
142 views

Why do 2-stroke engines burn more oil?

Of course, most 2-stroke engines require oil to be mixed with the fuel (I appreciate there are 2-stroke engines that don't require this). Therefore, it makes sense to me that oil will be burnt during ...
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2answers
86 views

4-stroke vs. 2-stroke rpm

Of course, this is not true for all engines (after all the pre-2014 F1 engines were 4-stroke and were rpm limited to 18,000 rpm). However, from my experience, 2-stroke engines tend to run at a higher ...
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3answers
976 views

Is it true that four-wheel drive is less efficient and if so, why?

I have heard many times that four-wheel drive is less efficient than two-wheel drive. Many car producers have a normal drive mode where only two wheels are powered, and turn the four-wheel drive on ...
0
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1answer
48 views

How do drag and downforce in a rear spoiler of a car vary with angle of attack?

I ran an two aerodynamic simulations, one for a spoiler angle of 0 deg and the other for the same spoiler declined at 30 deg. The results showed a considerable increase in downforce, but only a slight ...
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1answer
23 views

multi parts step files

first of all i am must say that i don't know much about cad systems . i am a software developer and i was given a task to make a webgl application that show some products in 3d . the product is ...
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0answers
28 views

Name of protocol used to communicate with Fuelling Station Dispensors

I am trying to figure out the actual (Range of ) communication protocols used to communicate with Fuel Dispensers at fuel retail outlets. I see them write 2-wire protocol which is not specific as ...
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0answers
54 views

12v relay to open and an close switch without sending power to switch

Sorry if this is elementary but here's what I need. I'm trying to power a relay via 12v DC (vehicle) to open a closed switch while the 12v power is sent to the relay. Essentially, when the blinkers ...
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0answers
38 views

Would an afterburner on a turbine drastically improve acceleration lag?

A little bit of context. My friends and I were watching the "Dark Knight Rises" and a discussion about the Batmobiles ensued. I, being a former ME student, said it was stupid that batman has a turbine ...
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1answer
44 views

Reverse vs Drive When Slipping Backwards

I was trying to drive up an icy hill with a front-wheel-drive car (2006 Honda Civic Hybrid) when the front tires lost traction and the car started to slide backwards. The car then easily spun sideways ...