Dual Stage Fuel injectors? 1

[TurboME]

Hi, I've been reading this board for awile but this is my first post.
I'm wondering if anyone here knows much about "dual stage" fuel injectors. I'm not talking about using two differnt sized injectors. I have been told that there are new large injectors that flow like a small injector at low rpm's inorder to give good idle and low end response and flow like a large injector at higher rpm's. I haven't been able to find much info on these. I did find one Japanese company, Power Enterprise, that seems to make a dual stage injector for the WRX but thats all I know. Does this type of injector actually exist and if so who makes them?

 

[turbocohen]

Here are the links to the patents:

http://patft.uspto.gov/netacgi/nph-...ht+AND+AN/siemens&RS=IN/wright+AND+AN/siemens

and

http://patft.uspto.gov/netacgi/nph-...&f=G&l=50&d=PALL&RefSrch=yes&Query=PN/6120005

and

http://patft.uspto.gov/netacgi/nph-...&f=G&l=50&d=PALL&RefSrch=yes&Query=PN/6128175

The key inventor operated a set of dual coil injectors for a period of years without problems. This allow a low cost saturated switch type ecu driver equipped engine to use a fuel injector with best of breed peak and hold performance with exceptional demonstrably superb voltage and temperature compensation.