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Things to Come-Electric Impulse Charging

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    Things to Come-Electric Impulse Charging

    I came across a fascinating article in Issue 289 of AutoSpeed, that great on-line Australian car magazine. Go to: www.autospeed.com

    The article is entitled, Coming Tech Breakthroughs by Julian Edgar and deals with several advanced technologies in current development. I will focus on only one area detailing how electronically-controlled valves in the intake system produce a supercharging effect. Read the article for the rest of the developments discussed. You can purchase the entire issue containing the article for US $4.10.

    This section of the article, "Electric Impulse Charging" is based on material released by Siemans VDO.This technique is carried out through the installation of an electromagnetically-controlled valve in the intake manifold ahead of each cylinder. As the intake stroke starts, the valve is closed creating a vacuum in the cylinder. As the piston reaches BDC, just before compression begins, the valve opens and the pressure drop that has been created draws air in at the speed of sound. This violent intake of air bounces off the piston crown and creates a counter-wave that flows back toward the top of the cylinder.

    But, just before the high-pressure wave can escape through the open valve, the valve snaps closed, resulting in an increased volume of air in the cylinder providing a charging effect which becomes immediately available in the space of one power stroke. The key here is the ability of the valve to switch from open to closed in a few milliseconds due to the fact that it is electronically rather than mechanically controlled. According to the article, electric impulse charging can provide up to a 30% increase in torque at low RPM. For example, a 30% increase in torque for the 2.0L Protege engine would result in an increase from 135 to~175 lbs./ft.

    A further benefit of electric impulse charging is that it results in increased air pressure in the cylinder at the end of the power stroke which enhances the scavenging effect on the exhaust gases. This in turn reduces the residual gas which is carried over to the next working cycle thereby reducing both combustion chamber temperature and the tendency of the engine to detonate.

    Here is a photo from the article illustrating how such a system might look.
    Last edited by goldstar; 04-17-2006, 11:44 PM.
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