555 EFI competition

[steve ravet]

generalmotors at exterminator.net wrote:
> 
> Dear fellow car lovers,
> 
> We spend too much money on PCMs. We have a project going to design a new cheaper generation of EFI using a single 555 timer circuit. For our 4 cyl cars we trigger the 555 from cyl one spark. The 555 controls all four injectors and the amount of fuel injected is controlled by a variable resistor that doubles as a choke for cold starting.
> 
> We use a heated oxygen sensor and have a simple circuit that makes variations to the 555 pulse width based on the oxygen sensor voltage.
> 
> Because we are trying to save money, we have not employed an engineer to do anymore work on this project and wondered if the DIY_EFI group could come to our aid to complete the design?
> 
> Your help would be most welcome in this low cost project. If we get any really good ideas then we will award a prize of your choice.

I don't know how to build an EFI circuit using only a 555 chip, but I do
have a plan for building a CPU using only diodes if anyone is
interested.

--steve


-- 
Steve Ravet
steve.ravet at arm.com
ARM,Inc.
www.arm.com
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