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Questions tagged [automotive-engineering]

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

If I were to look at "normal" batteries online, they often have charging C-rates of much less than 1. However, with an electric car that uses regenerative braking, obviously such a low charging rate ...
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1answer
19 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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97 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
46 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
965 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
24 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
34 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
35 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
35 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 ...
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2answers
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Over torquing two different materials

What happens when you over torque a joint comprising of two different materials ? Will the corresponding material wear make the joint leak proof ?
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1answer
25 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, ...
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0answers
16 views

Planetary Gearset for Power steering

I am trying to create a power steering system for a go-kart project. In order to switch off between remote control and human control, I plan on implementing a power steering system with a planetary ...
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2answers
41 views

Material for car mounted fire extinguisher bracket

Don't try this at home. I am taking personal responsibility for what happens in my car. Hi all, I recently purchased a fire extinguisher for my car (it weighs 1.5 lbs or 0.68 kg). I browsed the ...
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1answer
24 views

Camera and light frequency rate

I recently became curious why some lights flicker in some videos, and I read some explanation about it, and I still have some questions. 1. Does every light have to have a frequency? can it have an ...
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2answers
174 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 ...
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1answer
53 views

Must MSA (Measurement System Analysis) be re-performed after annual instrument calibration?

I'm working in an automotive company that must follow IATF (International Automotive Task Force) requirements. I administrate a test-bench that performs RF (radio frequency) tests using an ...
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1answer
72 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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2answers
39 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
57 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
159 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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1answer
48 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
37 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
94 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
37 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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3answers
50 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
30 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
53 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
25 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
34 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
50 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 ...
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1answer
124 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 ...
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3answers
81 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
54 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
89 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
281 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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2answers
50 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
52 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
149 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
48 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 ...
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3answers
131 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
55 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 ...
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0answers
60 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
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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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2answers
65 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
67 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
23 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 ...
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0answers
29 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 ...
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2answers
168 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 ...