Electromagnetic Engine Valves


Electromagnetic Variable Valve Timing (EVVT) opens a new frontier for improving internal combustion engines.  Scrapping the traditional timing belt and camshaft and exerting full computer control of valve timing, one gets better mileage, better performance, and lower emissionsMechanical VVT gets part way there, while EVVT does considerably better, competing with diesel efficiency, getting the most out of hybrid vehicles, and helping to turn HCCI from a laboratory dream into a real possibility.  Hydrogen fuel cells may be the solution for a more distant future, but between now and 2020, EVVT holds the key to significant improvements in both automotive-scale and small engines.

Why isn’t EVVT already in the marketplace?  It’s been a dream since the first patent over 50 years ago, but it’s hard to do right.  The business of Magnesense is solving the tough problems of cost, speed, complexity, and reliability, allowing the technology to move forward.



Small Engines

Auto Engines



Business Summary

About Us


Small Engines

Magnesense has developed an electromagnetic valve actuator for small engines, including:

  • a magnetic rocker that latches the valve open or closed

  • an inexpensive Digital Signal Processor (DSP) controller

  • fast-running fixed-point soft landing control software

  • sensorless servo control (with armature position and velocity computed from drive signal PWM and current)

The electronics and controls are applicable to both rockers and linear solenoid actuators.  We design actuators of both types.  We can develop an actuator and system to meet a customer's needs. 

We built the actuator solid model shown above and fit it to an existing engine with very little retooling.

Automotive Engines

We have designed and bench-tested automotive-scale valve actuators, seeking improvements in performance, economy, and low retooling.  Small-engine control innovations (see on the left) are applicable at automotive scale, while some structural innovations apply specifically to linear dual-acting solenoids of automotive or smaller scale. Demonstrated innovations include:

  • sensorless soft-landing servo control (see on the left)
  • a "flat lamination" armature design that combines mechanical strength with low eddy current losses
  • an inexpensive push-pull spring, on top, leaving the valve return spring and cylinder head un-retooled, the same as a cam engine
  • inexpensive DSP control 
  • fast fixed-point control software 
  • “one coil” design halves the driver electronics (a patented approach under study)

Magnesense LLC  Gorham,ME (207) 839-8637

©2009 Joseph Seale