Questions tagged [automotive-engineering]

76 questions with no upvoted or accepted answers
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6
votes
1answer
310 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 ...
5
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1answer
127 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 ...
3
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0answers
26 views

Problem in the inverse kinematic model of a car like vehicle?

I'm a electrical engineering student and i am building a simulation of a car like vehicle . As I understand it: The input for the forward kinematic model are the control variables and the output is ...
3
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0answers
42 views

Can You Identify This Deep Groove Ball Baring Bearing and/or Give an SKF Equivalent?

I am changing out my motorcycle engine bearings from the Chinese CJB brand to a high quality brand like SKF (Explorer range). I am still waiting on a heat gun in order to remove the bearings from the ...
3
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0answers
50 views

Sector determination of a nonlinearity and passivity

This a not a homework or any similar task. Regarding determine the determination of static nonlinearity, I know that one can draw two lines that contains the nonlinearity part. For instance for three ...
2
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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
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0answers
37 views

Can someone please explain what a PT1 filter is in simple terms?

The context here is for determining how driveability filters are calibrated since most of them use pt1 filters to filter the torque demand.
2
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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 ...
2
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0answers
28 views

High articulation joints

Looking for advice or suggestions for high articulation joints (>57°) for an automotive halfshaft. Peak operating conditions are in the ballpark of ~1000RPM, ~300ft-lb torque. I've considered u-...
2
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0answers
32 views

When calculating a car's suspension caster, after turning the steering wheel 20 degrees, why multiply by 1.5?

To calculate caster of one side of a vehicle, the steering wheel is turned 20 degrees to the left, and the camber is obtained; this represents the 'in' value of the front right tire. Then the steering ...
2
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0answers
20 views

Determining the threshold condition of an ABS brake system

In an ABS system there are sensors on each of the wheels which determine the angular velocity in order to pulse the brake of an individual wheel which registers a diverging reading indicating brake ...
2
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0answers
487 views

how to calculate required torque and rpm to through a 160 gram cricket ball horizontally at 160km/h velocity?

I am going to design a bowling machine. In this design, I'm going to use two motors that are being placed vertically and their shaft are attached with two horizontal identical wheels with a space of ...
2
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0answers
131 views

What is the rationale for a 6x6 truck chassis with 2 axles front vs. 6x6 chassis with 2 axles rear?

What is the rational for these two different 6x6 truck chassis arrangements? Is it merely a matter of intended distribution of weight across the chassis while in use? As in, two axles up front to ...
2
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0answers
31 views

Is there some temperature at which all "5w" oils should have about the same viscosity?

Is there some temperature at which all "5w" motor oils should have about the same viscosity? (5w-20, 5w-30, 5w-40, 5w-50, etc.) I am looking for SAE or ASTM wording or chart that says it straight ...
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 ...
2
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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 ...
2
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0answers
64 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 ...
2
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0answers
44 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 ...
2
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0answers
64 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 ...
2
votes
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 ...
2
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0answers
70 views

Mechanical engineering, Please help me finding the torque and answering other doubts too

Below I attached two BLDC motor commonly used for skate boards, I am confused with the calculation of stall torque for these two motors,What i need to know, What is the maximum weight lifting ...
2
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0answers
65 views

How does oxygen pump works?

In NOx sensors there are oxygen pumps that pump the oxygen out of the chamber. My question is, the oxygen is obviously pumped through the Zirconia zeolite, but how does it get released from at other ...
2
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0answers
153 views

How big does hail need to be to damage auto body panels?

I am trying to determine under what conditions falling hail will dent automobile panels. For example, is it determined by the size of the hail, the speed of impact, force, energy, etc.? I know there ...
2
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0answers
512 views

Calculating engine pressure from measureable quantities

How can I calculate the engine pressure in units of Bars by using torque, the cylinder volume, motor efficiency, and the gear reduction ratio? My values are as follows: ...
1
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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
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
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0answers
52 views

What are some techniques for improving stabilization given a mechanical time constant?

Problem: I have a self-stabilizing system that utilizes an intertial measurement unit (IMU) attached to the hull of a vessel. The system self stabilizes by performing matrix rotations based on the ...
1
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0answers
46 views

Ride Comfort Estimation using Accelerometers

I've been trying to find established/novel methods for calculating ride comfort using accelerometers and recently I came across this paper which uses ISO 2631 standard to get an objective measure of ...
1
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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 ...
1
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0answers
25 views

Finding force distribution using accelerometer data

The team I'm currently working for is trying to compare bushings with different durometer ratings in the front suspension using single axis(z) accelerometer data during curb impacts. The current ...
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
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
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0answers
28 views

Is it practical to increase engine efficiency by preheating petrol from engine heat waste ? is it applied in any automobile?

I found some article related to preheating the fuel to increase fuel efficiency, but I rarely see such implementation, I assume that it's less effective compared to others But is it really possible ...
1
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0answers
47 views

Is sitting on a double-decker bus's upper deck more hazardous than sitting on its lower deck?

Many people online allege feeling more 'wobbly' or 'unstable' while seated on the upper deck, than on the lower, and that in an accident, sitters on upper floors are more likely to be ejected out ...
1
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0answers
14 views

How can I learn the standards(EN,ANSI,ISO) which is related to "roller hemming method in automotive industry"?

There is a method using in automotive industry which is called roller hemming. I have a project about this method but before beginning the project I need to learn the standards(EN,ANSI or ISO) which ...
1
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0answers
185 views

Electronic Pressure Control, EPC

In short, the question is: How the EPC affects an automatic transmission? I'm planning to build an automatic transmission controller module, TCM for 4F27E Ford transmission. So far I haven't found an ...
1
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1answer
103 views

Max torque given in engine specification is indicated torque or brake torque?

I want to calculate brake torque from indicated torque for motorcycle.
1
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3answers
221 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
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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
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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 ...
1
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0answers
445 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 ...
1
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0answers
46 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 ...
1
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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
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0answers
115 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 these ...
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0answers
24 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 ...
1
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0answers
59 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 ...
1
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0answers
414 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 ...
1
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0answers
69 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 ...
1
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0answers
118 views

Why is longitudinal slip necessary for car to be able to move?

Suppose, the wheels of a car were to be replaced with solid concrete wheels, which do not deform,flex, etc. Would the car not be able to accelerate, take corners, etc ? I do not understand why is it ...