Converting railpressure sensor signal

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Converting railpressure sensor signal

Postby Martinjensen » Tue Dec 17, 2013 12:44 pm

Having a Corolla Verso 2,2D4D 2AD-FTV in for a complaint for extented crank time.
I am measuring the signal for the railpressure sensor, for viewing rail pressure build up.
Is there a method to convert the voltage signal from the railpressure sensor into pressure, using custom probes or maby math channels?
So i dont have to calculate it myself, but let the great Pico software do the math for me :-)
The scaling for the sensor is: 1Volt = 0 Bar and for every 160mv you have 100bar
It could be great to make a custom set up for both Bosch, Delphi and Denso railpressure sensors

Regards Martin Jensen
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Re: Converting railpressure sensor signal

Postby Robski » Tue Dec 17, 2013 4:33 pm

yes there is a method, whats the max reading (pressure) & at what voltage ? (you already have the base line)
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Re: Converting railpressure sensor signal

Postby Martinjensen » Tue Dec 17, 2013 8:55 pm

The sensor is a 5Volt sensor, and if we say that the maximum voltage output is 4,5Volt the pressure is 2187,50bar
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Re: Converting railpressure sensor signal

Postby KimAndersen » Tue Dec 17, 2013 9:40 pm

Hi

Just be aware of if you choose to make different custom probes for different rail pressure transducer, that you have the right specification for that particular sensor. I would say that you need OEM specification from the factory that are manufacturing those pressure transducer.

I reckon that your Toyota Verso are equipped with a denso rail pressure transducer ?

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Re: Converting railpressure sensor signal

Postby Robski » Tue Dec 17, 2013 10:11 pm

Martinjensen wrote:The sensor is a 5Volt sensor, and if we say that the maximum voltage output is 4,5Volt the pressure is 2187,50bar
Martin

is that factory information & exact ?
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Re: Converting railpressure sensor signal

Postby Martinjensen » Wed Dec 18, 2013 8:33 am

It's a Denso system capable of delivering 1800 Bar.
I am fully aware of the pitfalls of chosing the wrong scaling for the sensor.
But i think it would be neet to let the program do the math for me.

Regards Martin
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Re: Converting railpressure sensor signal

Postby Robski » Wed Dec 18, 2013 8:42 am

PM me your email address & I'll create you a probe, can you compare it against live data from your scan tool & give me feedback ?
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Re: Converting railpressure sensor signal

Postby Martinjensen » Wed Dec 18, 2013 9:44 am

PM Sent. :-)
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Re: Converting railpressure sensor signal

Postby Robski » Wed Dec 18, 2013 1:55 pm

email sent :wink:
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Re: Converting railpressure sensor signal

Postby smokey08 » Sun Dec 22, 2013 8:04 pm

I find this a very intresting topic. As in also into tuning i have had a look at how the ecus calculate rail pressure. I dont have any toyota denso information but i have extracted some information out of a peugeot dv6ted4 file (bosch edc16c34). I also checked a volvo file which uses same engine and values are identical.

Values are:
0 bar = 498.53mv
1800 bar = 4550.34mv

These are the only 2 values the ecu uses so it must be a straight linearisation between these 2 values.
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