November 11, 2002
Vehicles May Become Much More Efficient

The MIT Technology Review has an article entitled "Why Not a 40-MPG SUV?". It reviews a number of promising technologies that could make the standard internal combustion engine vehicle much more efficient. For example, electromechanical actuators could replace standard camshafts for controlling valve opening:

But the ultimate move toward optimization throws the camshaft away. Instead, electromechanical actuators would provide software-driven control for each valve (see “The Camless Engine,” below). By providing full control over the timing, lift, and duration of each valve motion, such a camless engine optimizes power delivery with the least possible fuel at every engine-rotation speed. The payoff is huge: a camless engine could improve fuel economy by 10 to 18 percent while also increasing engine torque by 15 to 20 percent at low speeds for faster acceleration.

The problem is that to prevent excessive wear and minimize engine noise and vibration, valves must decelerate before landing. A camshaft, though relatively inefficient, does this quite well, thanks to its ovoid shape, which produces a corresponding acceleration and deceleration in the valve motion. Actuators are different; they slam up and down, on and off.

The way to make actuators as gentle as camshafts involves a combination of hardware and software, and many companies are working on the problem.

It is surprising just how much more refinement can be done to the design of the internal combustion engine.

Share |      Randall Parker, 2002 November 11 07:58 PM  Energy Transportation

Thierry Dejaegere said at October 27, 2003 2:05 PM:

I'm also working on the subject. If you would like to see how I worked it out you can look at my site (

with kind regards

Justin Geer said at September 9, 2004 11:10 AM:

This camless engine technology solves camless engine problems by using a hardware based device to work with existing camless engine software to create an unsurpassed robust system control. Thank you for your support. Justin Geer

mayur belokar said at September 19, 2005 11:12 PM:

respected sir
we are the final yrs student of of maharastra.
we are working on computer in textile as a project.
we need more information on it .
so sir kindly help us .
thanking u
mayur belokar

Justin Geer said at November 24, 2005 7:28 PM:

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