Controlling analog signals from car engine fuel pressure sensor

Other Hardware General Electronics
1

Hey mates!

I am working on a project to boost a bit my engine perfomance.

To do this, I need to "hack" or "edit" the analog signal from the fuel pressure sensor on the engine. Basically, when sensor returns 0,5v or less there is 0 bar of pressure, and when it reachs 4,5v there is 1500 bar of pressure.

Now I have finished the board that fakes and modifies the signal from sensor to ECU and improves engine response, and it works quite well.

The next step is to make a button switch for switching between "ECO/Normal" mode and "Sport", and I want to use Arduino for switching, but also I want to show some data on the car dashboard screen via OBD-II.

This is what mechanic manual says:
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I will use Solid State Relays for swtiching between two modes. I thing it will be faster and they will not create back high peaks that can damage sensors or ECU.

My next question is: Do the SSR's do some voltage load when they are active? If so, what alernative can I use for fast switching, low loads, and can be safe for electronics?

Thanks in advance mates! :wink:

elearn.PNG

2

qopsinonstudios:
I will use Solid State Relays for swtiching between two modes. I thing it will be faster and they will not create back high peaks that can damage sensors or ECU.

My next question is: Do the SSR's do some voltage load when they are active? If so, what alternative can I use for fast switching, low loads, and can be safe for electronics?

Sorry, but you clearly do not understand what a "solid state relay" actually is. :astonished: In short, you wish to "fake" the sensor reading. You do understand the risk in doing this; that if your Arduino program crashes, that it may generate a completely erroneous output which could cause engine malfunction or actual damage. :roll_eyes:

OK, what you need to know is the impedance of the ECU input to which this sensor connects, in order to choose a switching device and the circuitry to actually generate your "fake" input.

3

I can’t see how changing fuel pressure or faking its signal will give you more power - if you up fuel flow, the lambda will sense the mixture is rich and the ECU will trim back the fuel trim value and shorten the time an injector is open, overcoming the rich mixture .

4

hammy:
I can’t see how changing fuel pressure or faking its signal will give you more power - if you up fuel flow, the lambda will sense the mixture is rich and the ECU will trim back the fuel trim value and shorten the time an injector is open, overcoming the rich mixture .

Yep. The ECU isn't going to be happy with this.