Rail Pressure Sensor: Pinout and Signal Levels

Hi,

Since I haven't been able to find any reliable information (only half-knowledge from self-proclaimed experts on forums like MT, etc.) about this, I wanted to ask if anyone could provide me with information regarding the pinout and signal levels of Bosch rail pressure sensors.

I need this (adapted for a different purpose) to visualize the combustion process (cylinder pressure measurement).

thank you;

Hello,

Caution: Please check if the rail pressure sensor is fast enough for your needs.

http://rb-aa.bosch.com/boaasocs/index.jsp;jsessionid=4D6B2FAD6086EA2459D7F65E18E8E128.sundoro?ccat_id=274&prod_id=218

I think glow plugs with an integrated pressure sensor would be more suitable; there was a discussion about that some time ago.

Best regards, Rainer.

Hi Rainer,

Shouldn't the rail pressure sensor also be a piezoresistive sensor?

I initially considered using a Beru pressure sensor, but I would need to find one with the right specifications (cone shape, length), and I'm also concerned about the signal output. I'm not very familiar with visualizing data from a rail pressure sensor using an oscilloscope.

The link to the Bosch catalog is really cool, thanks! I didn't know that Bosch releases so much information about the products on the market .

One revolution at idle speed (800 RPM) takes approximately 75 milliseconds, which corresponds to 360 degrees.

With an injection angle of approximately 5 degrees, the injection duration is about 1 millisecond. Surely the sensor can handle that?
I'll get all the necessary resources, and then I'll let you know if it worked out .

Hey VW enthusiasts,

If this is still relevant...

The PSG (Pressure Sensor Module) outputs a voltage proportional to the cylinder pressure, with a linear characteristic curve, and is quite robust for sensor applications. It requires a stabilized 5V power supply and a ground connection to function properly. The rail pressure sensor operates in the same way. Only the models designed for 2000 bar require a 3.3V power supply.

I wouldn't use a common rail pressure sensor because its pressure range is unsuitable. Common rail pressure sensors typically measure from 0 bar to 1500 bar, 1800 bar, or even 2000 bar, depending on the specific model. However, for measuring combustion pressure, you only need a range of 0 bar to 200 bar, and perhaps up to 250 bar if you're really pushing the diesel engine. This means that with a common rail pressure sensor, you would only get a voltage change of at most around 500 mV, whereas with a dedicated pressure sensor (PSG), you get the full voltage range of almost 5 V. In both cases, you will need to build an adapter. However, with a common rail pressure sensor, there's also the added problem that the routing of the hoses changes the combustion chamber, which can distort the measurement. The only advantage of a common rail pressure sensor is its availability as a used part, making it cheaper.

Smoky greetings.
Peter.