Questions tagged [automotive-engineering]
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503 questions
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Negative drag coefficient of the main airfoil in a multi-element configuration in CFD SU2
I get this strange result where the Cd on the mainplane of a Rear Wing of F1 is negative. However the Cd of the entire configuration (mainplane+flap) remains positive. Is there any possible physical ...
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How thick should aluminium plate be to support a person of upto 100 kg as a door step support into an RV?
I wish to fit a proprietary external slide-out step to my motorhome/RV. The issue I have is that I need to fabricate a U shaped box to fit outside under the existing internal GRP step to do this. A ...
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An easy to remove mechanism to RC control steering on a 2012 Ford Fusion
I have a 2012 Ford Fusion that I purchased on Facebook market place as a project. I intend to only use it on the parking lot near my house which is almost always empty.
I would like to add the ...
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aero thermofluids Bernoulli equation
Oil of relative density 0.8 flows at a volumetric flow rate of 0.216m3/s through a falling pipe which tapers gradually in the direction of flow. At point A in the pipe the diameter is 600mm and the ...
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What exactly does the clutch do?
So I am learning how to drive and from a few videos on youtube, I know that pressing the clutch disconnects the engine and gears from the wheels.
Now the question is:
I had pressed the clutch and the ...
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Is it true that some cabover trucks are designed to allow the cab to detach in a crash to protect the driver?
On a YouTube video showing crash tests between trucks and bollards where the cab tumbled over top of the bollard and continued for quite a distance a comment claimed that:
the cab braking [sic] of [...
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Calculate thermal efficiency of turbo vs NA engine using Otto cycle
Otto cycle
1. Naturally Aspirated Engine
We’ll use the following values:
T1=300K
T2=754K
T3=1754K
T4=698K
e=1- (T4-T1)/(T3-T2) =60.2%
2. Turbocharged Engine
For the turbocharged engine, we’ll use:
...
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How to compare acceleration of two cars with different power curves but same peak power?
If we have two engines with same max power, but with different power curve, how to define which car will accelerate faster? Assumptions is both cars have same mass, aero and tyre drag, neglect ...
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Spiral CNC Milling Toolpath for a Complex Shape
I working in the domain of Single Point Incremental Forming (SPIF) and am relatively new to the CNC milling. I am trying to fabricate a Car Hood (screenshot enclosed) by generate a spiral CNC milling ...
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Air-cooled diesel engine of 15 hp for car
Are air cooled single cylinder diesel engines of around 15 HP recommended to build basic (low technology) four-seater cars & light cargo vehicles?
If so, are there any detailed engine designs ...
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Automated transmission system clutch engagement
Can someone explain on which factors the clutch engagement and also disengagement depend in AMT? And how to understand the synchronization of speeds of Input shaft, Main shaft, Layshaft, and outshaft?
...
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Is there a way to calculate the equivalent constant engine torque from the torque graph other than using the empiric way?
I have some online car and moto transmission calculators and comparators that simulate the acceleration times etc.
After many years of trying to find a replacement for max power to characterize the ...
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What cars had this cooling system?
I wonder if a system that first heats up the engine, for a moment does nothing, and only then cools the engine, would be more efficient.
Furthermore, I wonder if such system could be as simple as ...
user50793
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How to calculate the Exhaust flow rate of a 950hp 410Ci motor?
Max Rpm is 9000,
Exhaust port diameter 37.846mm ,
4 into 1, 1 7/8"-2"-3.5" stepped header.
1.205kg/m³ air density
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Rotation Axis Transformation in High RPM Application
I am currently working on designing a go kart powered by a lawnmower engine. From my research, it is a large hassle to turn the engine on its side to have the shaft in the correct axis. Instead, I ...
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How to calculate clearance volume in internal combustion engine of a tractor?
To begin with, a tractor engine is provided to identify and calculate the terminologies associated with it. The bore diameter and stroke length is given as 15.84 cm and 8 cm respectively. Having ...
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Motor torque required to move a trolley
This is a real situation.
The trolley is mounted with a rack underneath it and multiple steel wheels on a steel track. The trolley is driven by the rack and pinion mechanism from a geared motor.
The ...
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What are factors affecting diesel engine speed?
In a diesel engine, what determines its speed? I want to learn the main factors.
For example, I think one factor is the amount of injected fuel, another factor is the torque demand.
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Determine reading on gauge that doesn't have enough tick marks
Is there a way to determine what the reading is on this voltage gauge using graphics and math? For example, in a computer program, could I draw a circle and then plot evenly-spaced tick marks (between ...
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Which position on a vehicle is least effected by the steering?
I am looking to position a paint sprayer for longitudinal lines on the roads. The plant I have is three wheeled the single wheel is at the front and dual at the back. It has the options to have the ...
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T-GDI vs NA Petrol Cruising characteristics
I am interested in the real world applicability of vehicles' real world cruising RPMs. Consider two cars' Power Curves:
1.5L MPFI NA Petrol ~ 30hp @ 2000rpm @ 6th gear ~ 1150kg kerb wt ~ runs at ...
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Why Volumetric efficiency is not considered as a performance parameter in case of 2 stroke engines
This mentioned in almost all standard books that for two stroke we use scavenging efficiency and trapping efficiency, but does not mention the reason, why volumetric efficiency is not used.
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Would placing sand bags on top of a car's strut housing reduce the jarring impact felt when the car hits a pothole?
I live in an urban area where many of the streets have pot holes and some of these streets have some very large and deep potholes. I have been wondering lately if it would be worth the effort to try ...
user33377
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Autonomous vehicle lateral control
I am working on a control system for autonomous vehicles, i am using a kinematic bicycle model simulated on matlab simulink and the formula i used for the steering angle is given in the figures below ...
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How would you handle the rebalancing of a bearing cage?
I am a intern who was tasked with finding the correct amount to mill off (in an angle) of a bearing cage (basically an annulus with gaps in it to hold the balls or rollers) to bring it back into ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
user33377
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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....
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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.
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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 ...
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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 ...
