Tuesday, May 17, 2011

CrazyEngineers Forum

CrazyEngineers Forum

Camless Engine: It would save fuel, run cleaner and more,,,

Posted: 17 May 2011 01:17 PM PDT

Good evening mates,

Most four-stroke piston engines today employ one or more camshafts to operate poppet valves. The lobes on the camshafts operate cam followers which in turn open the poppet valves. A camless (or, free valve engine) uses electromagnetic, hydraulic, or pneumatic actuators to open the poppet valves instead. Actuators can be used to both open and close the valves, or an actuator opens the valve while a spring closes it.

As a camshaft normally has only one lobe per valve, the valve duration and lift is fixed. The camshaft runs at half the engine speed. Although many modern engines use camshaft phasing, adjusting the lift and valve duration in a working engine is more difficult. Some manufacturers use systems with more than one cam lobe, but this is still a compromise as only a few profiles can be in operation at once. This is not the case with the camless engine, where lift and valve timing can be adjusted freely from valve to valve and from cycle to cycle. It also allows multiple lift events per cycle and, indeed, no events per cycle—switching off the cylinder entirely.

Camless engines are not without their problems though. Common problems include high power consumption, accuracy at high speed, temperature sensitivity, weight and packaging issues, high noise, high cost, and unsafe operation in case of electrical problems.

Source: Camless - Wikipedia, the free encyclopedia

In camless engines the method will simply be solenoids and sensors and some magnetic actuators (I don't have sufficient details).

However, there is a rumour saying that BMW will be the first to release it on its 3-series cars ;)

cheers,

Microchip vs. Atmel Microcontrollers

Posted: 17 May 2011 12:40 PM PDT

Hey everybody,

Was just wondering for those of you who do work with micro controllers, which company's controllers do you prefer to use? I have exclusively used the PIC controllers as it was what I learned on at school, but I see a lot of information on the web for people using the Atmel's.

Any comments would be great,

Thanks.

NEED OF POWER IC's

Posted: 17 May 2011 09:15 AM PDT

Hai I am doing a project in which I control an AC servo motor using micro controller. I need an interfacing IC between the both.. Also a generalized IC for an interfacing between 5 V dc microcontroller to the 230V 5A devices..

Zero Gravity - Right on earth. Stanford Capers in Micrograv

Posted: 17 May 2011 08:58 AM PDT

Quote:
Stanford researchers have completed the first successful tests in zero gravity of a protective shield concept for CubeSats – the tiny satellites that hitch rides on rockets sending larger satellites into orbit. The goal is to gather data on what happens when micrometeoroids slam into a satellite. Such impacts often knock out electronic equipment on satellites. The encounters are poorly understood, but the protective canopies could be a first step in eventually building "black boxes" for satellites similar to airplane flight recorders. Look what you can do with plastic sheeting and retractable tape-measure parts!
Endquote

YouTube - Zero Gravity Tests of Satellite Shield

Technical Videos from Thomson - The Linear Motion People

Posted: 17 May 2011 08:46 AM PDT

There are four interesting technical videos from Thomson here:
http://www.thomsonlinear.com/website...cal_videos.php

Help in my project portable car battery charger

Posted: 17 May 2011 08:44 AM PDT

hi ,,

I need help for my project (portable car battery charger)

I wont information about this project because i well write the report ......

Thanks

USB 3.0 Ten Times faster than USB 2

Posted: 17 May 2011 08:38 AM PDT

"The new USB 3.0 standard makes transmission significantly faster, reducing the time to download an HD movie from more than 9 hours with USB 1.0 and 13.9 minutes with USB 2.0 to 70 seconds with USB 3.0,"
Designfax, Tech for OEM Design Engineers

Spark Plugs are passe - Here come the Laser Igniter!

Posted: 17 May 2011 08:34 AM PDT

Lasers aim to spark revolution in internal combustion engines

Designfax, Tech for OEM Design Engineers

Decorative Concrete

Posted: 17 May 2011 08:15 AM PDT

How to Build a Gravity Retaining Wall

Posted: 17 May 2011 08:09 AM PDT

How to build concrete stairs the easy way

Posted: 17 May 2011 08:06 AM PDT

How To Build A Retaining Wall

Posted: 17 May 2011 08:03 AM PDT

House Paint Samples On Wall

Posted: 17 May 2011 07:55 AM PDT

Before you paint your home, Watch This Video

House Plumbing Design Problems

Posted: 17 May 2011 07:50 AM PDT

Tattoo Tales - Hybrid tattoo machine makes its design mark

Posted: 17 May 2011 07:48 AM PDT

For more than a century, the two-coil electrical tattoo gun has been the de facto standard in the industry, prized by artists for its direct vertical motion and the amount of variation it offers in needle pressure.
Designfax, Tech for OEM Design Engineers
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