TDI?

[dalek]

The Volkswagen (Well, I have seen one -- the one I have here -- in a Mercedes too, but...) TDI system, what do those wires that go to the pump control? I am just wondering how hard would it be to get one of those pumps working under MS.

[turboy]

Don't know about that, but I have some self study info about tdi diesel engines. If you're interested I can mail them to you.

Simon

Subject: TDI?


The Volkswagen TDI system, what do those wires that go to the pump control? I am just wondering how hard would it be to get one of those pumps working under MS.








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[dalek]

I would appreciate that a lot. Do you want me to pm my email or snail mail address?

[Guy_H]

Don't know about that, but I have some self study info about tdi diesel engines. If you're interested I can mail them to you.

Simon

Hi,
I'd be very interested too, especially any more info on the Bosch VE-EDC / VP37 pump as fitted to lots of Rover cars and the Land Rover 300tdi auto Discovery.

Has anyone done any data logging on one of these?

Cheers
Guy

[Guy_H]

This is the ECU pin wiring for a 300tdi auto Discovery if it's of any use

1 Fuel Quantity Solenoid
2 Fuel Quantity Solenoid
3 Fuel Cut Off Solenoid
4 Check Engine Warning Lamp
5 Needle Lift Sensor (signal)
6 EGR Solenoid
8 Glow Plug Relay
9 Aircon Active
10 Injector Timing Solenoid
11 Glow Plug Warning Light
12 Sensor Earth
13 Sensor Earth
14 Fuel Quantity Feedback Sensor (from ecu??)
16 ECU Positive Feed
17 ECU Positive Feed
18 ECU Gnd
19 ECU Gnd
21 Fuel Quantity Feedback Sensor (reference??)
25 Throttle Position Sensor Idle Switch
26 Brake Pedal Switch (1st)
27 Diagnostics (L Line)
29 Speed Sensor
31 Brake Pedal Switch (2nd)
33 Throttle Position Sensor Supply
35 Fuel Temperature Sensor
36 Inlet Air Temperature Sensor
37 Throttle Position Sensor Signal
38 Mass Airflow Sensor
39 Fuel Quantity Feedback Sensor (measured??)
42 Diagnostics (K Line)
44 Aircon Sense
45 Immobiliser Signal
47 Crank Sensor (signal)
50 Tachometer
51 Boost Pressure Sensor (+VE)
53 Coolant Temperature Sensor
54 Boost Pressure Sensor (signal)

[Guy_H]

Thanks for the info Olafu

The injected fuel quantity can be continually varied between zero and maximum. By means of an angle sensor (Hall short-circuiting-ring sensor, HDK), information on the angle of rotation of the actuator and therefore on the setting of the control collar with respect to the cutoff ports, is reported back to the ECU and used to calculate the correct fuel quantity as a function of engine speed.

I presume it will also be a function of load, signalled from the TPS, MAP (and MAF although I'm not sure on the latter)

As I understand it the solenoid control works as the governor would in a mechanical system.

I am struggling to find much about the HDK sensor other than it would seem to operate on an AC signal.
I am trying to track down a copy of the Bosch books

Injection timing device is partially similar system as in the mechanical controlled VE-pump: Pump's internal fuel pressure is proportional to the pump speed. Fuel-pressure-controlled hydraulic piston turns the timing ring under the cam plate. In EDC, electrical solenoid valve bleeds fuel out from on that piston. Fully opened valve results later later start of injection point, and fully closed valve (full pressure on the piston) will result earlier point of injection start.

So the injection timing signal is not a timed to any specific event more of a variable control (PWM) to adjust the base mechanical timing.

Injection advance will reported back to the ECU with inductive needle motion sensor.


together with info from the crank sensor


Has anyone got any papers or anything showing waveforms & timings etc or done any logging?

or any info from the Bosch technical books would be very much appreciated

Cheers
Guy

[Guy_H]

Ok some more info for anyone interested

http://www.htsuk.plus.com/BOSCH_VE_PUMPS.pdf

http://www.htsuk.plus.com/DIESEL_ENGINE_MANAGEMENT.pdf

http://www.google.co.uk/books?id=curvRz ... ngyQ3xSfzA

Need to dust off the 'scope now and start poking around