Questions tagged [automotive-engineering]

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Why do turning cars travel along a circular path?

I see it explained as each rolling wheel experiences a centripetal force in the direction toward a turn center (axis or rotation) as in Fig 1 below. This is the definition of circular motion. But what ...
Matt Zusy's user avatar
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42 views

Electric motors and Internal Combustion Engines compared

I know that Internal Combustion engines are rated in terms of peak power developed, while electric motors are generally specified in terms of continuous power output. Is there a good way to determine ...
Slartibartfast's user avatar
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2 answers
120 views

How to Convert a manual steering system into autonomous steering system, the should have the ability to steer in both manual and autonomous mode

What kind of actuator might be used to covert a manual steering system to Autonomous steering system. Currently, I am having a small buggy with manually steering, containing a steering ratio of 4:1. I ...
Geetika Yadav's user avatar
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1 answer
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Are all autonomus vehicles (self driving cars) electric vehicles (EV) or are some also internal combustion engines (ICE)?

Are all autonomous vehicles (self driving cars) electric vehicles (EV) or some are also internal combustion engines (ICE)? I was having a discussion with my friend and he was insisting that all ...
DSP_CS's user avatar
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2 answers
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Is there any special coating or paint that will strongly bond to an automobile tire's tread and can be driven on?

I would like to know if there is any special coating or special paint that can be applied to the tread of an automobile tire, strongly bonding to it, and which is strong enough and durable enough to ...
user57467's user avatar
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Are double universal (Cardan) joints exactly constant velocity?

Some double universal joints use a centering joint to ensure that the angle of the input and output are equal to maintain a constant velocity through the joint. From what I can tell, this centering ...
Ryan's user avatar
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Is there a way to add a DIY knock sensor to an engine?

I have a Rotax 914, a type of aircraft engine which is basically a 1980s turbocharged carbureted 4-cylinder boxer. There is no knock sensor, but considering the absolute devastation that detonation ...
Kenn Sebesta's user avatar
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How can a slipper assist clutch on a motorcycle provide a friction zone?

Most modern motorbikes come with a slip and assist clutch - this is typically provided by a mechanism of ramps that will force the clutch plates apart when the engine drives the wheel under hard ...
rep_movsd's user avatar
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What specification describes best a bulldozer "strength"?

Bulldozers are tracked-type tractors designed to push soil and heavy objects. In a typical specification sheet, the following are listed: Flywheel power (hp or kW) Gross power (hp or kW) Engine ...
Triceratops's user avatar
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Minimum number of cylinders of Opposed Piston 2 stroke Diesel Engine

Would fewer than 3 cylinders work? Would 2 cylinder and even a single cylinder cause too much non-overlapping time between intakes so that the centrifugal impeller of the super/turbocharger starts to ...
Meatball Princess's user avatar
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How much can you modify a car without affecting safety systems? (Airbags, Crumple zones)

I have a silly little idea for a car involving moving the engine to the back (FF or FR, into a RR). I know it sounds silly, but silly ideas are just how I seem to run. I simply don't see the fun in ...
Katy's user avatar
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Power and energy usage monitoring for Vechical Control Unit (VCU)

I'm working on a project for an EV (electric vehicle) and I'm working on the VCU. I think the task that was given to me is to get all the data from a transformer or a DAQ (Data acquisition system) and ...
JOE BOB's user avatar
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2 answers
58 views

Automated steering system for crash testing vehicles

To test crash barriers, we crash cars into them at a specific speed and angle. The car must hit a designated impact point within plus or minus X inches. I'm wondering if it is possible to build a ...
Hasan Iqbal's user avatar
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1 answer
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Alternatives of rubber sealant cement for finalizing patch-plug repair on car tyre?

I am doing a patch-plug repair for a 2mm puncture injury on my car tire: I have two questions: 1.) The minimum I got at local stores (in India) is a 6mm patch-plug. Do I need to drill/cut the injury ...
Akay's user avatar
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Energy comparison of gas and electric automobiles

I'm trying to work out some comparisons of gas and electric automobiles, and am running into something that doesn't seem right to me. Let me explain: Let's say a typical electric car has a range of ...
Dave Tweed's user avatar
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Bolt tensile load through an "intermediary"?

Following up on this question, does it change anything if the bolted arm is an intermediate arm (e.g. some sort of mating interface like below)? That is, the arm receiving the load is connected to the ...
TechieJ's user avatar
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How to clean out base oil entirely

I've got a fluid line filled with base oil (Lubricant Oil). Would running detergent through it clean the line? I was thinking of running normal detergent water through it. I'd like to use the same ...
John Snow's user avatar
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2 answers
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Failing engine A-Mount (bad design by the automotive manufacturer?)

I currently own a Tata Nexon Petrol car (in India) where I have seen (on facebook, Telegram, WhatsApp owner groups and youtube) that the A-Mount on the engine has suffered multiple failures for some ...
Akay's user avatar
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3 answers
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Any real heat engines based on the Carnot cycle? (or an equally efficient cycle)

Most practical heat engines are based on ideal cycles whose processes are different from the Carnot cycle (eg; constant pressure or constant volume heat addition instead of isothermal). I understand ...
aurora-s's user avatar
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1 answer
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How to model a driver's appropriate braking for deceleration, and throttle for acceleration for a car moving on a straight road?

A project team within my company is stuck on a conundrum and have asked me for some insights. They want to develop a driver model (mathematical or drawn) where input is the car's velocity profile, and ...
Balaji Harihar's user avatar
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2 answers
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Flywheel power vs. Gross power in bulldozers

In product specifications of bulldozers, the manufacturers give several figures for the engine power, such as flywheel power, net power - Net SAE J1349/ISO 9249, ISO 14396 power, and Gross SAE J1995 ...
Triceratops's user avatar
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2 answers
65 views

Why do some car's A-engine-mounts have bolts vs studs vs both?

I have come across engine mounts of various cars and am just curious primarily related to the "A" engine mounts where some manufacturers use only BOLTS, while some use only STUDS and some ...
Akay's user avatar
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What are parameters are to be considered while selecting Battery Management System?

what are factors to be considered while selecting bms? Does the BMS required change with cell chemistry and cell geometry? if yes, how does it depend. and also How do we determine the placement and no....
Yetukuri Revanth's user avatar
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I want to simulate Motor output WRT throttle

I don't have any idea on how to get started. Can you mention required relations and concepts to get started.
Yetukuri Revanth's user avatar
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Steel to aluminum structural equivalent

I am trying to build an aluminum trailer on an airbag suspension. The plans are for a steel frame and we are looking to construct it out of aluminum to save weight due to towing limitations. Not sure ...
Raymond's user avatar
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1 answer
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Functioning of compression rings

I have just completed a university course in tribology, but have a question that pertains to real-life applications. For pistons in combustion engines, the rings seal the combustion chamber from the ...
Erik's user avatar
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1 answer
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3-way differential

I am interested in finding a way to facilitate constant 6-wheel drive utilising a centre differential that splits the torque from the gearbox between the 3 axles while allowing them to vary in ...
Kevin Headlam's user avatar
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3 answers
85 views

Why engine oils form emulsions?

Oil and water should not get mixed/emulsified according to the rule that similar dilutes similar. What is the reason that they form an emulsion in crankcases when there is water ingress?
Larsa se eidaklaxtarsa's user avatar
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5 answers
319 views

Why did the Mythbuster's dimple car get better fuel economy?

I'm trying to understand why the Mythbuster's dimple car gets better fuel economy - if it actually would as I'm not I understand that a golf ball functions by creating turbulent air flow and via the ...
Grant Curell's user avatar
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Modeling Horsepower as a function of engine speed and throttle position in an ICE

I'm a grass roots motorsports guy who is into road racing. I'm doing some precision tuning on the horsepower levels on my car to meet specifics of our rule sets. I have lots of logged data of ...
Ben Grambau's user avatar
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Why does a car generator employs an alternator (i.e. AC) when power supply is provided by a battery (i.e. DC)?

An alternator generates AC current, whereas batteries (as far as I know) provide/are charged with DC current. So I'm wondering, how is this apparent mismatch explained? Do car manufacturers employ a ...
temporary_pigeon's user avatar
1 vote
1 answer
299 views

How can I control my vehicle’s electric power steering system?

I’m trying to add lane keeping assist and adaptive cruise control to my 2017 Chevrolet Camaro, with the ultimate aim of using Comma.ai’s openpilot (or some other fork) to make my car drive itself. ...
Anthony Napodano's user avatar
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1 answer
32 views

Diesel vs petrol NOx / PM?

I am interested in the comparison of NOx and particulate matte (PM) for modern (Euro 6) diesel engines vs petrol engines? Are the exhaust products produced by both equally carcinogenic?
user707264's user avatar
1 vote
2 answers
143 views

How does 2nd gear create more thrust than 1st gear?

Let’s analyze a vehicle parallel to velocity and forces applying on it. The 1st gear has a maximum velocity value after which you can’t accelerate more. It means that thrust force on wheels generated ...
Jawel7's user avatar
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10 votes
7 answers
9k views

Why are bulldozers so slow?

Tracked-type tractors and bulldozers are very slow engineering vehicles. Their top speed is less than 15 km/h and when pushing it is even lower (< 5 km/h). For example: the Caterpillar D9's top ...
Triceratops's user avatar
-1 votes
1 answer
134 views

How does the hydraulic valve system work in excavators?

There are many types of valves used in excavators. Two are important: the main valve and the pilot valve. Is the pilot valve is controlled by the operator and the main valve is controlled by the pilot ...
Prerna 's user avatar
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1 answer
95 views

NOx emissions in diesel engines

What are the specific challenges and potential solutions for reducing NOx emissions in diesel engines without sacrificing fuel efficiency, considering the trade-offs between various aftertreatment ...
Todd Takala's user avatar
1 vote
2 answers
164 views

How many pistons are used in Excavator Engine and how they coupled with pumps?

As I am examining the components of a Caterpillar 323D hydraulic excavator, I would like to inquire about the specifics of its diesel engine. Can you provide information on the number of pistons and ...
Prerna 's user avatar
0 votes
0 answers
95 views

Find transfer function of a drive pulley where the output is a spring force

I have the following system and have deduced the equations of motion to be and with the substitutions for the spring forces we get I understand how to find the transfer function of any single ...
Sonite's user avatar
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1 vote
2 answers
63 views

Half bidirectional transmission shaft gear box solve

I'm wondering how to accomplish some kind of gear box that would reverse only the direction of one side of the two shafts on it, like in the picture below.
Electropepper's user avatar
2 votes
2 answers
50 views

Two Definitions of Kinematic Viscosity and it's Importance in Engine Oils

I have come across two definitions of kinematic viscosity and I am wondering about their relationship and significance in engine oils. One definition describes kinematic viscosity as momentum ...
MechaTrex's user avatar
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0 votes
2 answers
58 views

Where do I find mechanism for paper flipping and refeeding in printers?

I've started out in engineering and can't seem to find the mechanism in printers that flip and refeed the paper back for printing. There are a few engineering YouTube videos that show machine ...
Dan.is.Asking's user avatar
0 votes
1 answer
60 views

For an ICE, how can torque to the left of peak torque rpm be lower?

This is my understanding of how a torque-rpm graph is produced. Start the engine and go to wide open throttle, there is no load and this is basically the right end point of torque-rpm graph with the ...
Shuheng Zheng's user avatar
1 vote
1 answer
35 views

How to remove ground detections of an ultrasonic sensor place in the front bumper of car? [closed]

I am working on a project to fuse the sensor information of 4 ultrasonic sensors place on the front of a car in the bumpers. The detections from the sensor would be generated not only from the ...
Mehul Acha's user avatar
2 votes
1 answer
108 views

Why does a newer car have a bigger engine and produce less power?

I was looking at two cars that friends have, and I was comparing the specs, and don't understand what is going on. One is a 2017 7 seater Citroën C4, which has a 1.2L 3-cylinder petrol engine, ...
Corvus's user avatar
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3 votes
2 answers
229 views

Why excavators use Hydraulic motors for rolling or moving forward instead of diesel engine?

I am currently studying How excavators work? and came to know that "In excavators diesel engine is used to drive the hydraulic pump. The high pressure fluid from hydraulic pump is used to run the ...
mech_duck's user avatar
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0 answers
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Is it possible to connect 3 rear drive Tesla motors on a single axle using their differential's?

Each Tesla motor that is sold comes attached with an inverter, open differential and a gear reduction. The image on the right of my drawing shows more clearly my preferred most recent setup with a ...
Emmanuel Moreno's user avatar
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0 answers
22 views

Calculating fuel mixture from injector pulses

I have a simulation of a fuel injection system and the result is a set of pulses that operate the injectors. I know how long the pulses are in milliseconds and I know how much fuel is emitted from a ...
user150402's user avatar
1 vote
4 answers
107 views

How Does the Suspension Work with a Rigid Differential?

This is a basic question, but if a car's wheels are rotated by the drive shaft through the differential, which is a rigid piece of metal with gearing inside, how does the suspension system allow the ...
itisyeetimetoday's user avatar
-1 votes
3 answers
117 views

Combusting engine braking: is part throttle more effective than no throttle?

A counterintuitive question. An engine when in overrun generates a braking torque. This is generally considered to be because the engine is working as an air pump past a closed throttle. However that ...
J Collins's user avatar

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