Questions tagged [automotive-engineering]

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13
votes
4answers
21k views

How much clearance does a car need when turning a corner?

I am contemplating buying a new car. However, the approach to the underground garage in my apartment has a 90 degree frustrating turn. Given the dimensions of the approach and car, what is the max ...
9
votes
9answers
6k views

How can "mpg" be high under low engine load?

Let's say a car at 60 mph requires roughly 20 hp to maintain its speed (i.e., to overcome rolling resistance and drag). If this car makes 240 hp and gets about 34 mpg (not too unrealistic), how is it ...
9
votes
2answers
248 views

Why does reducing the amount of emissions control improve the fuel economy of a car?

In addition to power and performance, one of the reasons VW cheated their emissions results was to improve the fuel economy of their cars. Why exactly does this happen? I'm familiar with cars and how ...
4
votes
3answers
329 views

What causes Rolling Resistance?

I am currently reading “Fundamentals Of Vehicle Dynamics” by Thomas D. Gillespie. The author mentions how the asymmetric pressure distribution across the length of the contact patch of a tire while ...
3
votes
3answers
1k views

How to design a vacuum climbing robot

I'm trying to design a mobile robot which has to climb over flat 60° inclined wet glass surfaces. I was thinking to use a large vacuum system composed by a large fan connected to a brushless motor. ...
1
vote
2answers
36 views

Is stroboscope a useful device to control the translational vibrations?

There is few material on net related to stroboscope applications. since it is an optical device, it is best used to control the vibrations of rotary devices like turbine blades electromotors etc. but ...
53
votes
9answers
21k views

Why do cars have mirrors for rear view rather than cameras?

Despite having so much technological advancement, I wonder why cars still uses mirrors (right and left side of the driver) for the rear view. These mirrors can be easily replaced by cameras and ...
14
votes
3answers
4k views

What happens when you put the wrong type of fuel in an internal combustion engine?

What happens to the working of petrol engine when it is emptied and filled with diesel or to a diesel engine emptied and filled with petrol? Will the engine be able to operate and, if not, why not?
3
votes
2answers
1k views

Is the reliability of automotive sensor technology impeding the success of self driving car?

The reality is that sci-fi KITT is almost here. Recently I read articles Delphi car driving itself across the country as well as Tesla cars will be self-driving this summer. As of 2013 four states (...
0
votes
1answer
1k views

Car Suspension Force Equations

So I have found this equation: $F_\mathrm{suspension} = Kx + F_\mathrm{damper}V_\mathrm{contact}$ Where: $K$ = spring stiffness $x$ = the contact depth of spring(also known as spring compression) $...
9
votes
5answers
455 views

Why is "regular" gasoline standard instead of something more knock-resistant?

The standard light petroleum distillate for vehicle engines, "regular gasoline," is (or is equivalent to) some mix of heptane (C7) and octane (C8). Higher proportions of C8 are more knock-resistant, ...
6
votes
2answers
884 views

Remote start on a car with manual transmission

I'm making a remote starter for a car using a Raspberry Pi. The problem is that the car has a manual transmission. The driver needs to remember to place the gear shift in neutral when parking, ...
5
votes
4answers
4k views

How to simulate car acceleration

I am a high school physics student and I've been trying to simulate the acceleration of a car as it fully accelerates from rest, but I'm finding it's much harder than I thought. Here was my first ...
2
votes
2answers
548 views

How to calculate the steering ratios on multiple axle vehicles?

I'm building a model of a long vehicle with 6 axles and I want to be able to steer it. How do I calculate the amount each axle should steer to minimise dragging of some wheels round sideways as it ...
2
votes
4answers
2k views

How does Hysteresis in tires helps create friction?

I am currently reading “Fundamentals Of Vehicle Dynamics” by Thomas D. Gillespie. The author states how tires generate the required frictional forces for movement by 2 methods : 1)Hysteresis 2)...
0
votes
1answer
67 views

Find optimal configuration for Stirling Engine

I'm trying to figure out the theoretical calculations for a Stirling Engine system so I can determine optimal piston size, optimal piston displacement and number of pistons. I want to calculate which ...
6
votes
2answers
5k views

Does having 2 engines together increase anything?

If I have a vehicle (V1) with one 100 kW engine and an identical vehicle (V2) with 2 of these 100 kW engines, will this mean that V2 will have double the torque of V1 and double the top speed of V1? ...
5
votes
1answer
853 views

How do I calculate rolling resistance for tire on pavement?

First condition assuming perfect rolling, no slip, from what I understand is that the rolling resistance coefficient can be calculated as the displacement arm of the normal force the tire "feels", in ...
4
votes
3answers
3k views

Reason of Using exactly 5 Wheel Studs per Wheel

So today when I was taking a taxi and looked at the vehicles, I observed that the majority of the light vehicles (i.e. 16-person minibus/ 4-6 person cars) use 5 (or less frequently, 6) wheels studs ...
4
votes
3answers
7k views

How can I determine the power generated by a regenerative braking system?

If I have an electric vehicle on an incline (m=17,300 kg) I want to figure out how much energy it would generate by regenerative braking. I've used $a= g \cdot \sin({\theta}) $ and $f=m\cdot a$. <...
3
votes
4answers
5k views

What is the axis of rotation of a turning car?

I was wondering while parking my car, what is the axis of rotation/pivot of a turning car? Does it differ when it is turning frontwards of backwards? Is it different for a 4x4?
2
votes
1answer
58 views

What standards exist regarding diagnostic systems in automotive engineering?

I'm designing a diagnostic system that simulates an environment and user input for a dummy vehicle. All possible critical situations are simulated in order to find out whether any errors are triggered,...
2
votes
0answers
131 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 ...
2
votes
2answers
345 views

Engineering formula to relate engine displacement and power

I am currently rating two motorcycles to decide which one to buy. The criteria which is most important to me is the power-to-weight ratio. Now, I want to calculate the power of the motorcycle by ...
1
vote
1answer
1k views

Pacejka Formula - natural values

For my racing game I am using a simplified Pacejka Magical Formula: $\mu_{lateral} = \mu_{0} * \mu_{1} * D * \sin(C * \arctan(B * x - E * (B * x - \arctan(B * x))))$ Where: $\mu_{lateral}$ is ...
1
vote
3answers
72 views

Does the engine size affect torque and RPM?

I'm a bit curious about how exactly the torque and RPM could be determined from an engine. One website states that bigger displacement engines develop more torque while smaller ones spin faster, which ...
1
vote
2answers
847 views

Does the turbo-compressor increase the efficiency of car engine?

Once the turbo is on, more air can participate to the combustion, which also requires more fuel. Then, it's clear that the turbo can give more power (at the price of more consumption). Question 1: ...
1
vote
1answer
220 views

How to calculate the output power of engine exhaust

Apologize if probably this is duplicate question. But I have tried to search if someone have asked such this question. I have a Honda engine, GX200, 196cc, with it's gross power is 6.5HP. I would ...
1
vote
2answers
96 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 ...
0
votes
1answer
124 views

What signals are expected on the connectors for this 12V Volkswagen Scirroco wiper motor circuit

EDIT: added a picture of a very similar unit. I picked up a used VW rear? wiper motor that I want to use for a simple motion experiment. Having no idea how to power the thing I popped open the case ...
-1
votes
1answer
32 views

What is the minimum frictional force required for a vehicle to operate smoothly, retain traction, and prevent any skids?

I am not looking for a specific number of course. I know that it may perhaps vary with different vehicles. However, I'm trying to figure out how to theoretically calculate the minimum necessary ...