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Questions tagged [automotive-engineering]

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1answer
10 views

CANbus simulator for win or linux [closed]

Im trying to learn how CANbus works and how you connect to CAN bus and sen amd get messages. Since we work with CAN at work I would really like to be able to "program" a network using CAN. However I ...
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1answer
50 views

Calculating the Braking Energy of a vehicle

you might find my question stupid. I am unfortunately not an engineer and didn't find the answer on google. I want to calculate the braking energy of a vehicle decelerating from v2 to v1 (km/h). ...
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Why is it recommended to place the new car tires on the rear axle? [migrated]

When buying a pair of new tires for a car, it is presumed they are better than the (worn) tires being replaced. Isn't steering better when you put them on the front? Why is it recommended to put the ...
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0answers
112 views

Vehicle Dynamics Problem: Cornering wheels must slide on the road

Can anyone see this geometric fact that cornering wheels must slide on the road? What I mean is that the tread within the contact patch of the rolling wheel, which is travelling along a curved/...
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For multi-pistons engine, what will happened if a car with one or more its piston failed?

Apologize if this one is just trivial for you. I have searched if someone have asked or discussed this topic. For a multi-pistons vehicle (engine), what will happen to the engine if one or more the ...
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0answers
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Horsepower And Torque Cross At 5,252 RPM. What if An Engine Never Reach the 5,252RPM?

There is a very nice explanation here how to derive the constant 5,252 in Power (HP) calculation from its torque. Very easy to be understood. Please watch. But the problem is, what if a car never ...
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2answers
34 views

Where the Water Have Gone from Engine from a Combustion Process (C8H18+12.5O2==>8CO2+9H2O)?

During studying engine's exhaust as I asked here, I have to go far. The thing I though is quite simple, the fact is complicated. Thence I knew that there is water produced in combustion process. The ...
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2answers
55 views

What is the Meaning of To Warm Up an Engine?

I have both car and motorbike. Just common car and motorbike. My car is Toyota 2005, and my motorbike is Honda 2016, I bough both brand new. Both them are fuel injection. Before them, I owned car and ...
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1answer
36 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 ...
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0answers
27 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 ...
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1answer
31 views

Why to compress the hydrogen + air mixture in Hydrogen ICE engines when combustion efficiency of hydrogen at 1 atm is already high?

ICE Engines are designed to burn the fuel and air mixtures at high pressures to increase the combustion efficiency. But hydrogen combustion efficiency is already high at 1 atm and at constant Volume ...
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2answers
92 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 ...
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1answer
36 views

Is it possible to replicate a motorcycle engine cylinder head?

Is it possible to create a mold of an aluminium motorcycle cylinder head so that you can create an exact replica with melted aluminium?
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0answers
32 views

Do any cars have hydraulic, but not power assisted, steering

As per the title, do any production cars use hydraulic linkages for steering instead of the usual rack and pinion setup? Would this have more drawbacks than benefits?
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3answers
49 views

How to actually control slip?

I'm trying to wrap my head around the question: "what is the optimal slip ratio and how do I go about controlling it?". I'm working on a control strategy for an electrical vehicle. The issue I'm ...
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0answers
25 views

Maintaining constant speed of a CVT engine during a slope

I am not sure if this question is related to this community. But nevertheless. I work on CVT engines, I had a new idea of modifying my controller during a slope or a gradient on the road so that the ...
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1answer
44 views

90 degree pivot steering system to allow vehicles to move sideways

Are there any restrictions that would not allow a steering system to cause a vehicle to be able to move sideways - at 90 degrees from the convention direction of travel?
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0answers
22 views

Best way to connect electric motor and differential in a tight space

I want to know, what the best way to connect an electric motor to a differential in a tight space. I first thought of a drive shaft, but the angle is to steep. The diff would be of a BMW E46 320d and ...
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0answers
30 views

Why are there no fully diesel electric cars?

Diesel electric locomotives seem popular, even these days. The UK's Type 45 destroyers have tried integrated electric propulsion, and I think that there are hybrid motor-generator cars that can ...
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0answers
45 views

Measurement of ICE torque

I'm seeking a precise description of engine torque. We talk about torque in terms of the twisting force that the piston exerts on the crankshaft with a radius equivalent of the rod throw. Assume ...
2
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1answer
101 views

How should the assignment to test software for a vehicle’s VCU be aproached?

As a graduation project, I was assigned to solve the following problem: How can the vehicle’s behaviour be simulated in the form of a testing programme, with which the VCU software can be fully ...
2
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3answers
63 views

Why not drive an air source heat pump domestic heating system with an auto engine?

Theses are my thoughts on the question. I can't find an answer to "why not?". It there something I am missing, or are auto manufacturers simply too focussed on cars only? The automotive industry has ...
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1answer
50 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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1answer
63 views

Why diametral pitch is not used in S.I units

Here in this book of Theory of machines by S.S. Rattan it is written that diametral pitch is not used in S I units. Why is that so?
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1answer
142 views

What are positive drive gears? [closed]

Gears are called positive gears and belt drives are called negative drives. Explain in detail.
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1answer
33 views

What are the challenges in building a 'sports car' frame and body?

Clearly if it were easy to produce attractive looking cars for cheap, there would be a lot more 'modern' and good looking cars on the road. While beauty certainly is in the eye of the beholder in ...
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1answer
46 views

Solidworks Motion capabilities

Is Solidworks Motion capable of finding the torque of the planet carrier (output) in a planetary gear set when in steady state? The sun and ring gears are both inputs and all gears are rotating at a ...
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2answers
87 views

Why do petrol engines have lower compression ratio than diesel engine?

Patrols have higher self-ignition temperature than diesel, but still, petrol engines have lower compression ratios than diesel engines. As the self-ignition temperature of petrol is shouldn't we be ...
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1answer
44 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
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3answers
119 views

Why do small displacement engines have higher RPM ranges?

So lets compare my dirt bike and my daily driver: My dirtbike is a single 350cc cylinder 4 stroke engine. It has a redline at 12.1k RPM. My daily driver is a six cylinder 3.6L V6. The redline on it ...
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1answer
29 views

Twin cylinder engine opposed cylinders

Hoping this is the best area to ask this, mostly in the DIY and hobby world I've seen 2 engines coupled together to make a twin engine some so this for the zen of doing, but others do it to align the ...
2
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0answers
59 views

Explosion in an open pipe

I have a design for a gasoline engine cylinder that is open at the top, closed at the bottom (a single pipe cylinder) that operates on opposed force (the pistons move lateral to the up-down direction ...
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0answers
8 views

Is the PCV valve open during high engine load

I was learning about PCV valve, when one of the online resources pointed out that the PCV valve will be closed during high engine load to prevent the lean-mixture (blow-by) in the crank case from ...
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0answers
19 views

Type of Material | Experience Based | Reactive to Moisture

https://www.youtube.com/watch?time_continue=21&v=b-A6Hs_1SME I play baseball for my school and this device (see link) has always intrigued me. I have done roughly 10 hours of research on trying ...
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2answers
60 views

Why don't car engine piston-rods (or similar parts) fail as often as other car parts?

Anyone who has owned a car has ultimately dealt with failure of a sensor (parking), or A/C failure, battery shutdown or a tyre puncture. Part breakdowns like these are pretty common, at least ...
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2answers
64 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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0answers
19 views

How to calculate slope/tilt from IMU

I have to calculate the slope/tilt from a 6 axis (3D Accelero, 3D Gyro) IMU. Are there open source libraries that help one do this or should I build it on my own? How do I get started? Is there an ...
2
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0answers
28 views

When is the Equal Pressure Point in a Typical ICE?

My question refers to a typical bog standard normally-aspirated 4-cylinder petrol/gasoline engine. Let's say it's a 2.0 litre engine (10:1 compression ratio, firing order 1-3-4-2) operating at 2000 ...
2
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2answers
103 views

Calculate maximum acceleration of a car from rest (optimum launch)

First disclaimer: I have a background in math, but I'm no expert in engineering or physics. This is the first question I've ever posted and I think it belongs here, but please let me know if belongs ...
3
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1answer
72 views

Efficiency and NOx emission of lean burn gas engines

I have a question regarding the efficiency of lean burn gas engines. Maybe it is just a confusion concerning the terminology of "thermal efficiency", "brake mean pressure", "brake thermal efficiency" ...
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0answers
143 views

Design torque calculation for an electric vehicle

We are building an electric vehicle. How is the required torque determined for our vehicle for a given total weight of the vehicle, highest vertical gradient and maximum acceleration? We need this ...
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1answer
24 views

Why are there rivets on the drum case of a band brake

Ive seen some images of band brakes and I notice there are usually two rivets (or screws) on the drum casing (encircled in the image below). What are the rivets riveted to? And why are they riveted? ...
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0answers
71 views

How to regulate torque/RPM on an IWD vehicle

Generally, I'm interested in simple (DIY) electric vehicle design problems. I saw some photos of electric vehicles as in the following pic: or also you could check this youtube video. The vehicle is ...
2
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2answers
104 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
53 views

Why are tires inflated?

My question is why are tires inflated? Wouldn't it just be better to make a rim out of a light but strong material, like fiber glass, then cover it with a thick coat of rubber, then it wouldn't pop if ...
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0answers
33 views

Could we use NE 555 Timer for industrial magnetic proximity switching circuit?

I actually need a magnetic proximity switching circuit such that In the case of water in fuel sensor, whenever the water level in water in fuel sensor increases the magnetic float shall move and come ...
2
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1answer
77 views

What are the limiting factors on diesel engine compression ratios?

Higher compression ratios in internal combustion engines generally improve the engine's fuel efficiency. But diesel engines don't seem to go above a ratio of 25 or so. What is the limiting factor for ...
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1answer
66 views

Distance of Pivot from the Rear axle

I am designing an NSAM crane. I have encountered the following issue when designing the vehicle: Generally the pivot(or the point about which the NSAM crane rotates) is in the center. But from two ...
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3answers
100 views

Why can't energy be entirely recovered from a moving car's rotating wheels?

I have a friend who isn't properly visualizing energy loss in a moving car. His idea: Cars that can run forever without being recharged - - > while the engine rotates the front wheels the move the ...
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4answers
141 views

What is the purpose of grid-like details on engine blocks?

It is common to find this kind of detailing and patterning on engine blocks and related parts. Older engine blocks display much more flatter and simple geometry and this kind of mold work must come ...