Questions tagged [car]

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4answers
52 views

How is it possible that it took until the 1950s or even longer before they started using car belts and neck-supported seats?

I've spent a large amount of my life thinking back on past times, both long ago and "recently", meaning ~1950s to me. A lot of things make sense, but some things just fundamentally baffle me. One of ...
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1answer
22 views

Emulate normally closed relay with 2 normally open relays

Good afternoon, I have recently ordered a normally closed relay to fix on my car's daylight-running lights. When the main lights come on the DLR should switch-off. Unfortunately amazon has delivered ...
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0answers
22 views

probability of a horrible airbag failure?

An airbag should save lifes. But occasionally it turns to hell for the unlucky people experiencing an airbag activation without a reason. How likely is about the probability that this happens (An ...
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1answer
43 views

Why HMMWV's lights aren't located at the edges?

Hummvee has front lights located far from edges, closer to each other. That makes it harder to see edges of the vehicle in the dark.
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2answers
65 views

How fast could a Mini Cooper go in a vacuum?

Lord Evulz just stole the Earth's atmosphere. Our hero must race his trusty old Mini - which he had already prepared to be airtight, to ensure the tires do not explode, with pre-packaged oxygen to ...
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1answer
36 views

What is the voltage at the ground electrode of a spark plug?

Since the voltage required to bridge the gap between the central electrode and the ground electrode of a spark plug can reach up to 40 000V and even more, my question is, how does the battery not die ...
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2answers
46 views

A few questions about cars

When I start the car, why do I hear the engine working when I'm not pressing the gas pedal? How exactly does the torque and power of the gears work? Torque = Radius * Force Power = Torque * Speed ...
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1answer
48 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
65 views

What wheel setup on a small, solar powered car, would have the least rolling friction?

We are attempting to design a solar car. The solar panel 4 1/2" x 13". I like to break these problems into their simplest form, in order to eliminate the least amount of possibilities. So, the goal ...
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2answers
79 views

What should be the material and thickness of front pillars to stop car (~1,847kg and ~262 km/h) without killing the driver?

"Tesla Model 3 owner died in a tragic accident with a semi truck. The Model 3 went under the truck’s trailer resulting “in the roof being sheared off as it passed underneath,” which is known as a “...
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2answers
64 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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3answers
985 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 ...
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1answer
86 views

Why vehicle horns are tuned to consonant intervals?

The primary purpose of a vehicle (car, locomotive, etc.) horn is to warn other traffic units that something potentially dangerous is about to happen. And so, others must pay attention to the signal. ...
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0answers
41 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
26 views

Sonomotors, Sion: Can this electric car really charge up to 30km only from its solar cells?

Maybe you have heard about Sonomotors and its futuristic electric car, the Sion. If not, here is the link to its website: https://sonomotors.com/ Anyway, the manufacturer claims that this car can ...
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0answers
23 views

Frequency domain analysis of steering system of a car

Can anyone share the equations involved, or some relevant theory material for frquency domain analysis of steering rack and pinion using bode plot?
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1answer
309 views

Can a rolling wheel create a side force without first rotating on a vertical axis at its contact patch? [closed]

There is something wrong with the way we describe how a cornering vehicle wheel creates a cornering force. I think a rolling wheel must first rotate on a vertical axis to then create the cornering ...
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1answer
75 views

Physics of Trailer Hitch Height

I'm modifying a lawn tractor to pull single axle trailers in a woodland environment. They are rear wheel drive, have enough power, but traction is our biggest issue even when using tractor/ATV ...
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2answers
189 views

Passing by a semi truck on a highway

So I’m driving down the highway in my sedan on a speed of lets say 60 mph. Why is it that my car sways just before it passes or it passes me? Almost always where the semis first tire is (closest to ...
3
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2answers
99 views

What is the percentage of direct workers in an automotive production plant compared to all the employees?

I am not asking for specific numbers of any production plant. I want to know the general direct worker/employee ratio of a plant. Example: if there are 1000 employees working usually 700 of them are ...
5
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1answer
326 views

Proccess of a 4-wheeled vehicle taking turn

I have observed that when a 4-wheeled vehicle takes a turn, one of it rear tire moves with more speed as compared to the other. For example A car is taking right turn, its right rear tire will be ...
2
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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,...
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2answers
69 views

Working out RPM from car engine's lb ft?

Using an old copy of an automobile magazine, these are the cars with hp and lb ft I am trying to work out the RPM for: 2007 Honda Accord 2.4 sedan, 2.4-liter 187hp 4-cylinder, 164 lb ft pulling power ...
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1answer
44 views

Wheel angle for turning

Given a car configuration with a length of L and width of W. If you can give the top left wheel an angle of A to turn A degree how do you derive the angle of top right wheel for turning . I know that ...
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2answers
155 views

How do hybrid cars achieve greater fuel efficiency?

In this question I’m comparing non-plug-in hybrid fuel/electric vehicles with fuel-only vehicles. Also, I’m not disputing that hybrid cars are more fuel efficient, I’m just trying to understand how. ...
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1answer
52 views

Similarities between OBD-II and VGA

I'm working on a project to make a Heads Up Display in my car. I need a way to present my project in front of my class, for I obviously cannot bring my car into the presenting room. My professor ...
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1answer
33 views

Why do I need to place car cabin filter according Air flow label

in most of car cabin filters (for example MANN filter) I see that I need to place it according the "Air flow" label? But why I need to do that? What will be wrong if I will put it in opposite side ...
2
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2answers
3k views

Friction clutch and the force required

I recently learned the basics of automotive clutches, more specifically friction clutches. Here is a simplified version of their operation explained to me (the car starts at rest): The engine and the ...
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1answer
952 views

What is Inlet-valve Mach index?

What is the meaning of this statement "In a reciprocating engine the flow of intake charge takes place through the intake valve opening which is varying during the induction operation. Also, the ...
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6answers
9k views

What limits the speed of a car?

From an engineering perspective, what limits the maximum speed you can reach with a regular car? I understand that some of the faster cars are for safety reasons limited to not run faster than say 250 ...
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1answer
25 views

What is the fraction of power transmitted to the generator in full-hybrid cars?

In full-hybrid cars like the Toyota Prius, usually both internal combustion engine (ICE) and electric motor produces mechanical power to the wheels at cruise. But some of the mechanical power produced ...
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1answer
56 views

how can i improve a current engine by redesigning internals such as pistons , …etc? [closed]

i am designing a new car and planning to use an existing engine, my field is aerospace engineering so i have a good knowledge in machine design and thermodynamics, at first where can i find the ...
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5answers
875 views

Why do electric cars claim “instant torque?”

I was at a well-known electric car company today and they claimed "instant torque." The quote was something like the following: Driving this car is very different from a gas-powered vehicle. For ...
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6answers
532 views

Does the speed of Heavy Vehicles make more potholes

Should Heavy Trucks drive more slowly on weak (bitumen) roads to reduce potholes in the road surface? I am discussing with a feasibility engineer what causes more potholes. He says it is simply the '...
4
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2answers
200 views

Six-Wheeled Mousetrap Car [Concept]

My classmates are making mousetrap cars to go 10 feet, and whoever goes the fastest wins. How a mousetrap car works is by attaching a lever arm to the snapper (the part of the mousetrap that shoots ...
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2answers
49 views

Equal power transmission in 4x4 vehicles?

If a 4x4 (true 4x4 not AWD) has 3 wheels slipping, does the one tire with traction receive all the torque available from the transmission? Is there typically a reduction in power transmission in 4x4 ...
3
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2answers
185 views

Why does “Google self-driving car”'s roof camera rotate?

I'm intrigued by this video in which the roof camera rotates continuously. One reason could be to capture 360 degrees around, but then again two cameras or more could do the same job capturing ...