Google Groups no longer supports new Usenet posts or subscriptions. Historical content remains viewable.
Dismiss
tachograph speed pulses (simulator)
887 views
Skip to first unread message
Gazz
Oct 5, 2012, 7:15:33 PM10/5/12
to
Anyone on here service/calibrate tachographs? or have knowlage of them???
I am building a bus simulator cab, and am working on the dashboard,
I have an arduino board that communicates with the bus sim program, and i
have the outputs to work gauges and a rev counter that i used as a speedo,
basically i have a square wave output that varies according to the speed (if
i were to connect a speaker, i'd get a rising and falling tone as the speed
goes up and down... anyone who knows arduino's, it is the tone generator
function i'm using.
This worked the rev counter nicely, as it's basically pulsing to earth so
many time a minute to get the needle to show the apropriate speed.
But now i have got a proper tachograph and things are a little different it
seems.
The tacho is a VDO Kienzle 1318.27, 12 volt version.
I have the power and earth to it no problems,
the speed input i have been trying to get working on the B plug, terminals 1
and 2 are +ve and -ve, and 3 and 4 are pulse inputs, according to the little
diagram on the top of the unit, it seems to want a positive pulse on one
wire, whilst getting a negative pulse on the other, is this correct??
it shows on the diagram a '2159' pulse generator used on those connections.
i assume that is the 4 imp/m signal,
There is also pin 7 on the B plug, and pin 3 on the D plug that are labeled
V -imp, it seems that means speed impulse? is that an input or an output,
the 4 imp/4 signal is referenced as a distance signal,
what i'm wondering, is there a way to feed the tacho a simple varying pulse
to get it to work? or do i need to somehow convert my pulse output from the
arduino, into a 'double pulse inverted' signal that the 2159 generator
gives?
I am building a bus simulator cab, and am working on the dashboard,
I have an arduino board that communicates with the bus sim program, and i
have the outputs to work gauges and a rev counter that i used as a speedo,
basically i have a square wave output that varies according to the speed (if
i were to connect a speaker, i'd get a rising and falling tone as the speed
goes up and down... anyone who knows arduino's, it is the tone generator
function i'm using.
This worked the rev counter nicely, as it's basically pulsing to earth so
many time a minute to get the needle to show the apropriate speed.
But now i have got a proper tachograph and things are a little different it
seems.
The tacho is a VDO Kienzle 1318.27, 12 volt version.
I have the power and earth to it no problems,
the speed input i have been trying to get working on the B plug, terminals 1
and 2 are +ve and -ve, and 3 and 4 are pulse inputs, according to the little
diagram on the top of the unit, it seems to want a positive pulse on one
wire, whilst getting a negative pulse on the other, is this correct??
it shows on the diagram a '2159' pulse generator used on those connections.
i assume that is the 4 imp/m signal,
There is also pin 7 on the B plug, and pin 3 on the D plug that are labeled
V -imp, it seems that means speed impulse? is that an input or an output,
the 4 imp/4 signal is referenced as a distance signal,
what i'm wondering, is there a way to feed the tacho a simple varying pulse
to get it to work? or do i need to somehow convert my pulse output from the
arduino, into a 'double pulse inverted' signal that the 2159 generator
gives?
Peter Parry
Oct 6, 2012, 7:40:54 AM10/6/12
to
On Sat, 6 Oct 2012 00:15:33 +0100, "Gazz" <no...@m.ta> wrote:
>Anyone on here service/calibrate tachographs? or have knowlage of them???
You might find some useful information in
>Anyone on here service/calibrate tachographs? or have knowlage of them???
http://aftermarket.continental-corporation.com.au/files/YVAVGLJ4T8/TU00-1318-0200302.pdf
which is the full service manual for the 1318
also
www.bolec.com.au/411100-r4c.pdf
http://www.in-car.nl/AWS/doc/Impuls%206%20English.pdf
www.matt.pl/getfile.php?id=TWjs
kitaspyb
Oct 8, 2012, 5:41:18 AM10/8/12
to
power to the generator. B3 and B4 are the speed signal inputs. The
speedo of the tacho should work with just one but the tacho will pulse
when stationery, 0-30 kph every 8 secs, as part of regulation
diagnostics. The second signal prevents that happening. If you only have
a single speed signal then apply it to the tacho pin 3. Take a second
line from the same signal source and connect to the base terminal of a
MPS A13 transistor. Connect the transistor emitter to pin B2 and
collector to pin B4. Job done.
Pins B7 and D3 are speed output signals.
--
kitaspyb
Gazz
Oct 8, 2012, 5:15:31 PM10/8/12
to
> The 2159 impulse generator produces two signals. B1 and B2 provide the
> power to the generator. B3 and B4 are the speed signal inputs. The
> speedo of the tacho should work with just one but the tacho will pulse
> when stationery, 0-30 kph every 8 secs, as part of regulation
> diagnostics. The second signal prevents that happening. If you only have
> a single speed signal then apply it to the tacho pin 3. Take a second
> line from the same signal source and connect to the base terminal of a
> MPS A13 transistor. Connect the transistor emitter to pin B2 and
> collector to pin B4. Job done.
> Pins B7 and D3 are speed output signals.
Excelent, thanks for that,
> power to the generator. B3 and B4 are the speed signal inputs. The
> speedo of the tacho should work with just one but the tacho will pulse
> when stationery, 0-30 kph every 8 secs, as part of regulation
> diagnostics. The second signal prevents that happening. If you only have
> a single speed signal then apply it to the tacho pin 3. Take a second
> line from the same signal source and connect to the base terminal of a
> MPS A13 transistor. Connect the transistor emitter to pin B2 and
> collector to pin B4. Job done.
> Pins B7 and D3 are speed output signals.
yup, i've got the needle swing to 30 and back every half minute, which i
figured is due to it expecting an earthed speed signal on either B3 or B4
when stationary,
With a single speed signal, the needle waves around wildly upto 5kmh, at
about 4.3kmh the needle will go full scale, and at 5 it will come back, then
will read properly,
is that part of the 'dodgy speed signal detected' electronics? or do i have
another issue possibly,
The program that reads the simulators speed and puts out the speed pulses
reads 0 to 1250 pulses, (the bus simulator is written very realisticaly, the
speedo in the simulation/game gets it's reading from the rotation of the
virtual prop shaft... so altering the rear axle ratio or tyre size in the
code throws the speedo out, just like in real life)
But i have set the tacho's dip switches to all off, and am feeding it 10
pulses per kmh (the 0 to 1250 pulses, 0 being stationary, 1250 being 125
kmh... tho the buses in the simulator max out at 76kmh.. 1989 era german
buses with voith 3 speed boxes)
Anyway, i'll go and have a play with a transistor and see if it works,
Gazz
Oct 8, 2012, 6:52:55 PM10/8/12
to
Hmmmm,
Just tried the tranistor jobbie, i didnt have a MPS A13 in my parts bin,
but used a BC337, and it seems to work.... with B4 connected as desribed,
the needle doubles the speed shown, which i have read is proving the tacho
is getting the double pulses, however i still have the needle wobble below
5kmh,
Wonder if this could be a fault in the tacho,
i have had the drive motor's cover off, and cleaned the resistive track
under the output cog (drive motor unit operates as a servo i guess) the
resistance changes smoothly as i move the cog when it's back in place,
So i'm wondering if it's a circuit board fault, afaik the signal i'm feeding
it is smooth, as the speedo i drove before didnt show the needle wobble at
all,
Just tried the tranistor jobbie, i didnt have a MPS A13 in my parts bin,
but used a BC337, and it seems to work.... with B4 connected as desribed,
the needle doubles the speed shown, which i have read is proving the tacho
is getting the double pulses, however i still have the needle wobble below
5kmh,
Wonder if this could be a fault in the tacho,
i have had the drive motor's cover off, and cleaned the resistive track
under the output cog (drive motor unit operates as a servo i guess) the
resistance changes smoothly as i move the cog when it's back in place,
So i'm wondering if it's a circuit board fault, afaik the signal i'm feeding
it is smooth, as the speedo i drove before didnt show the needle wobble at
all,
kitaspyb
Oct 9, 2012, 12:05:12 PM10/9/12
to
The full scale travel will occur when the tacho is de-powered then
re-powered and receives a speed signal, hence it will FSD at that low
speed. The low speed fluctuation is caused by the low pulses being fed
to the tacho. The lowest calibration settings of the DIL switches, is
over 2000 pulses per km. Try setting the switches to 2 3 and 9 on with
all others off and see if that makes a difference. If you can get up to
2400 pulses per km setting the switches 1 4 6 7 9 & 10 on will give you
60kmph at 2400 ppkm
Let me know how you get on.
--
kitaspyb
Gazz
Oct 9, 2012, 8:40:46 PM10/9/12
to
> Hi
> The full scale travel will occur when the tacho is de-powered then
> re-powered and receives a speed signal, hence it will FSD at that low
> speed. The low speed fluctuation is caused by the low pulses being fed
> to the tacho. The lowest calibration settings of the DIL switches, is
> over 2000 pulses per km. Try setting the switches to 2 3 and 9 on with
> all others off and see if that makes a difference. If you can get up to
> 2400 pulses per km setting the switches 1 4 6 7 9 & 10 on will give you
> 60kmph at 2400 ppkm
> Let me know how you get on.
Not got on well :(
> The full scale travel will occur when the tacho is de-powered then
> re-powered and receives a speed signal, hence it will FSD at that low
> speed. The low speed fluctuation is caused by the low pulses being fed
> to the tacho. The lowest calibration settings of the DIL switches, is
> over 2000 pulses per km. Try setting the switches to 2 3 and 9 on with
> all others off and see if that makes a difference. If you can get up to
> 2400 pulses per km setting the switches 1 4 6 7 9 & 10 on will give you
> 60kmph at 2400 ppkm
> Let me know how you get on.
it seems that anytime i set switch 8, 9 or 10 to on, the needle drive jumps
to about midway, even with a zero speed input signal,
so i can't seem to get it to accept a higher pulse count yet, will have
another play tommorow, but wondering if something is screwed in the tacho
for it to act like it does with the top 3 dip switches set to on,
Gazz
Oct 12, 2012, 9:27:40 PM10/12/12
to
Thanks for all the help to try and get this thing working,
Unfortunately i've given up and cheated, as the old speedo unit worked
perfectly on the sim, i've given the tacho head a transplant,
basically i've gutted the head leaving just the backlight bulbs and warning
led's pcb's in place, then mounted the guts of the speedo on the back of the
tachograph face.
obviousely means i've lost the milometer function and the clock, BUT i don't
get the needle swinging to 30kmh every 30 seconds when the sim isnt running,
or the needle wobble and FSD upto 5kmh all the time,
When mounted in the dash, it looks like a proper tachograph, the speed
indicator needle moves properly and smoothly... and silently, i found the
tacho's servo motor needle drive a bit noisy.
Unfortunately i've given up and cheated, as the old speedo unit worked
perfectly on the sim, i've given the tacho head a transplant,
basically i've gutted the head leaving just the backlight bulbs and warning
led's pcb's in place, then mounted the guts of the speedo on the back of the
tachograph face.
obviousely means i've lost the milometer function and the clock, BUT i don't
get the needle swinging to 30kmh every 30 seconds when the sim isnt running,
or the needle wobble and FSD upto 5kmh all the time,
When mounted in the dash, it looks like a proper tachograph, the speed
indicator needle moves properly and smoothly... and silently, i found the
tacho's servo motor needle drive a bit noisy.
0 new messages