Questions tagged [automotive-engineering]

Filter by
Sorted by
Tagged with
2
votes
3answers
319 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 ...
0
votes
0answers
35 views

DIY Car -> engine help required [closed]

Hi I am not really a car guy or an engineer but I have a little project of building my Dune Buggy and I am currently checking at the engine part of my project and I am a little lost. At first I ...
1
vote
3answers
607 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 ...
1
vote
3answers
80 views

Do gears affect top speed?

Do more gears affect the top speed/acceleration of the car in any way? I know the gears won't increase hp since more gears would increase RPM but would decrease torque.
2
votes
1answer
59 views

Cross-drive steering transmission forward movement

The following is a diagram of a cross drive steering transmission component. The labels are in German, but my following explanations will be in English. (from https://de.wikipedia.org/wiki/Datei:...
1
vote
3answers
220 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 ...
1
vote
1answer
44 views

Trajectory of the center of mass of a vehicle

The problem is to find the trajectory of the center of mass of a car when it is rotating and translating (after an off center collision, for instance) What i know as input is the trajectory of the ...
0
votes
2answers
52 views

Is the overall weight of an engine always based on it's engine size?

While there are many factors that contribute to a vehicle's overall weight, one thing I'm concerned about is the weight of an engine. Does a larger engine mean it's always heavier, or do the number of ...
0
votes
0answers
55 views

Why is pressure in a common rail fuel system so much higher than in an air compressor or supercharger?

Superchargers in cars are bulky, expensive, consume considerable amount of engine's power and yet they generate only about 6-9 psi boost. On the other hand, modern common rail diesel engines inject ...
1
vote
1answer
53 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?
1
vote
1answer
70 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 ...
1
vote
2answers
60 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 ...
16
votes
3answers
5k views

Why do heavy trucks use air brakes?

I was having a discussion today, which led to the question why do heavy trucks still use air brakes? To my knowledge, it has been used for at least 40 years (I remember that as a kid), and ...
1
vote
2answers
39 views

car steering to enter the parking lot [duplicate]

I would like to understand if a "typical" car could be able to turn in this space at the entrance to the underground garage. How can I set up my calculation? I have a 2.5 meter mouth at the ...
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 ...
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 ...
0
votes
3answers
112 views

How can I achieve better MPG?

My car is a Citroen Xsara coupe 2000. I am little tight financially at this point and I try to save money from everywhere I can... I was wondering what is the ideal speed for my car to achieve the ...
1
vote
3answers
141 views

What affects a car's overall top speed?

I've always wanted to know how a car's top speed could be determined. Usually, I thought it was horsepower and aerodynamic drag. I learned that weight can affect top speed, but I've recently found out ...
0
votes
1answer
293 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 ...
1
vote
2answers
952 views

What does the torque curve of an engine mean?

I have been trying to understand the torque curve and power curve of an engine. From what I have read and understood I know that the torque curve and power curve is has a peak at a particular RPMs(RPM ...
2
votes
2answers
2k views

How to Understand the Relation of Compression Ratio and the Octane Number?

In my country are sold gas with different octane number (RON: Research Octane Number): 88, 90, 92, 95, 97, 98, and the latest is 100. RON-88 is still sold since still many old cars, motor bike, and ...
4
votes
3answers
137 views

Improving ac efficiency in car

I live in Oklahoma. HOT in summer. I drive a small car. Honda Fit. Seems to me, a smaller cabin would cool faster than a larger one. If I "made my car cabin smaller," would the ac work ...
6
votes
1answer
309 views

Questions regarding Cornering Stiffness for RC Car

I am a bachelor's level student tasked with modeling the vehicle dynamics of an RC Car that will be made to drive autonomously. I lack prior experience or particularly specific education with vehicle ...
2
votes
1answer
60 views

How to control a mechanical part using a button(on/off) on a motorcycle?

I don't know how to correctly write the question. I have no background knowledge of electronics engineering. I was wondering for instance, How to open and close the Motorcycle Stand using the On/Off ...
0
votes
3answers
51 views

How do you optimize an engine for a farm tractor?

How is the engine of a tractor different from a car? So far, all I know, is, that a tractor has a rather high torque $ M $ and a car engine has rather high power $ P $. But physically, they are quite ...
5
votes
1answer
126 views

dSPACE compiler linker error -- fscanf undefined

I'm dealing with a somewhat intractable problem. We're running dSPACE 7.4 (RTI 1006) on MATLAB 2011a, which I understand uses the dSPACE DS1006 C Compiler v. 2.2. When I try to compile one of our ...
4
votes
1answer
187 views

Anti-Squat Force Transmission

I’m trying to understand how anti-squat works in motorcycles and how the geometry plays a major role. I don’t understand, however, the reason why the force from the tires that is transmitted to the ...
0
votes
2answers
55 views

Combining torque of IC engine and electric motor

I currently have a 6hp IC engine which I plan on using to drive the rear axle of a go-kart. I want to increase the torque delivered to the shaft by adding an electric motor in a sort of parallel ...
2
votes
1answer
48 views

Does rev hang in automobile engine depend on the engine load? What are the factors that affect rev hang in automobiles?

I know that rev hangs are intentionally introduced to modern vehicles that operate on electronic throttle bodies, by programming the ecu to close the throttle valve slowly (in gasoline engines) even ...
2
votes
4answers
185 views

Are stuffing boxes still relevant?

Three problems: Internal friction due to stuffing materials. - Why does it not matter? If it does then there must be some limits like rpm etc. Not entirely leak proof. - Why are we supposed to keep ...
0
votes
1answer
44 views

Why does my engine accelerate so slowly in rev at neutral?

Mustang EcoBoost - Turbo 4cyl - 2.3L 310hp 350ftlb 4.7 sec 0-60mph on 3600lbs car When revving in neutral at WOT it takes like 0.9 seconds to go from 1200rpm to 5000rpm The physics don't seem right. ...
1
vote
1answer
52 views

What is the max speed and duty cycle of an air conditioner's magnetic clutch?

I am considering using an automobile ac compressor to control the resistance of an exercise machine by engaging and disengaging the magnetic clutch to let it slip. The max torque should be about 500 ...
1
vote
0answers
24 views

Gear Oil HP 85w-140 vs HP-140

I have a 4 Stroke scooter 150cc (SYM JET-14). Manufacturer recommends 85w-140 gear oil. The price difference between 85w-140 and single grade 140 is tremendous. Given that in my country and during ...
1
vote
1answer
49 views

Can I hook up pressurized hydrogen to a gas piston engine and have it work as is?

I am looking to try some type of hydrogen conversion to get better gas mileage but also want to work on something new to burn some extra time. I was mainly looking to see if I could power the entire ...
1
vote
1answer
49 views

Why is the torque of an ICE low at low rpms?

Let us consider a basic 4-stroke single cylinder, direct port fuel injected naturally aspirated engine which is given a constant throttle. Now, why does it produce very low torque at low rpms, meaning ...
1
vote
1answer
42 views

Why is longitidunal force of tyre calculated negative in SIMULINK?

With the help of the Vehicle Dynamics Blockset of SIMULINK, it is easy to obtain longitidunal force (tractive force) of tyre by some of inputs. You can see one of examples below. In this simulation, ...
1
vote
0answers
35 views

Power calculations for starter motor designing [closed]

Let's consider an IC engine standard type motorcycle. What is the power needed from the starter motor to start it's engine? Please make all the calculations by taking suitable assumptions like the ...
1
vote
1answer
101 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, ...
1
vote
1answer
103 views
1
vote
0answers
21 views

Is it possible to Plot Damping Characteristic of a Gas Strut using Universal Tensile Machine(UTM)?

My aim is to use UTM to plot a Force vs Displacement plot which would demonstrate the damping characteristic of the gas strut. There is one existing research related to what I'm trying to achieve ...
1
vote
0answers
37 views

Any books or websites that anyone would recommend [closed]

I am a secondary/high school student to look into to help with mechanical engineering. I would like to do this for enrichment and as preparation for doing it at university. As well as this I am really ...
3
votes
1answer
32 views

How is rack and pinion steering configured for different wheel/axle spacing?

The rack and pinion is supposed to turn each of the front wheels differently, such that lines orthogonal to the wheels will intersect in line with the rear axle: Which components of the rack and ...
1
vote
0answers
35 views

What are some obstacles/issues you face while working in industry? [closed]

As part of a project incubator program at my university, I am trying to understand current specific issues, cumbersome processes, and obstacles facing engineering projects in industry. By pinpointing ...
1
vote
1answer
61 views

Which material index should be maximized for a component in a Car's manual type HVAC?

I was doing a case study on the plastic used in cars for controlling the AC in a manual type system which actually snapped in mine it just rotates according to the knob position in the dashboard, ...
1
vote
0answers
15 views

FEA Simulation of CHASSIS [closed]

What are the most accurate methods in static state for simulation of chassis wrt 4 cases: lateral bending, torsion, head on collision and a zero turn. The problem arises when it comes to applying the ...
5
votes
4answers
1k views

How can I add roof-mounted solar panels to a van without making it unstable at highway speeds?

We have an extended Chevy express with a 24" high-top, on which we intend to install roof-mounted PV. I'm really concerned with how to properly install the panels. We've selected six 100 W Renogy ...
4
votes
3answers
157 views

How does my automatic car shift without complete temporary loss of acceleration

When my car shifts gears, the car's acceleration never goes to 0. I feel that there is constant torque to the wheels throughout the entire shift. How is this possible during a gear change? ...
1
vote
0answers
31 views

what is the torque difference in single plate clutch disks and multidisk clutches? [closed]

I have a review question that I am not sure about the answer. The question goes like this: "In comparison to single plate clutches, multidisk clutches are associated to which of the below notions?...
2
votes
1answer
63 views

Suspension for a 135kg velomobile

I'm designing a four-wheel velomobile as a small city bike with good weather protection. The top speed in the city is about 25km/h (7m/s). The total weight of the velomobile is 35-45kg, and I expect ...
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)...

1
2 3 4 5
8