278 replies to this topic

[Bjørge]

You can only have a single time constant with one capacitor, as Tc is fixed due to using a fixed capacitor and fixed (very low due to wiring) resistor.


Could you draw a quick schematic of how to achieve what your saying with a single capacitor. Thanks

 

 

All conventional electronic knowledge points to T = RC. T, the time constant, is the time taken to charge the cap to 63.2%., and it takes roughly 5T periods to consider it almost fully charged

 

 

With a single capacitor , in a fixed circuit, the time constant cannot be changed, and the time constant remains the same for both  rising  (charging) and falling(discharging) voltages

 

It might be that charging and discharging resistance is different, like e.g. smoothing caps in a power supply. They are charged to voltage in a few msecs, but may hold quite a high voltage for minutes...

 

Ths may actually mean that you have different time constants.

[fixitsan]

 

It might be that charging and discharging resistance is different, like e.g. smoothing caps in a power supply. They are charged to voltage in a few msecs, but may hold quite a high voltage for minutes...

 

Ths may actually mean that you have different time constants.

 

 

Nope, they charge in mS because they are hooked up to the supply. The don't discharge (except via internal resistance) because the load has been disconnected.

 

Charging and discharging time constant is, as far as I'm aware, identical for all capacitor types

 

Isn't it included in basic grade physics any more ?

http://www.learnabou...y/dc_ccts43.php

[JBX]

Diodes in reversed polarity in serial with var resistors, one common cap.

 

And an opamp to bufferize the tps signal.

[fixitsan]

Diodes in reversed polarity in serial with var resistors, one common cap.
 
And an opamp to bufferize the tps signal.

Got a schematic ?

[fixitsan]

Got a schematic ?

I dont undestand how this would keep the tps output in sync with the position of the throttle valve butterfly, especially with rapidly changing throttle

[frits44]

If you change the idle screw remember to adjust the TPS position so it runs through the correct range

 

question,

 

What is the right number or value for the TPS sensor in your display ??

 

I read that people adjust the TPS sensor sometimes on 14, or even 17.

 

I now have in my diag mode d1 15 up to 97, it was 16 and I adjusted it on 15 at 1200 rpm

 

And why do people use a higher number or value.

 

 

Greetings, Frits from Holland 

[adamg]

Something around 15 up to approx 98 is the aim. The tps feeds the throttle opening to the ecu for fuel injection and possibly also ignition advance?

[frits44]

Something around 15 up to approx 98 is the aim. The tps feeds the throttle opening to the ecu for fuel injection and possibly also ignition advance?

 

adamg ok, I understand that

 

but why do people adjust these numbers to maybe 14 to start or 17 on the TPS sensor  

 

THANKS

 

Greetings, Frits from holland

[fixitsan]

I would adjust it to the best running position Frits.

 

Particularly around the 2000-3000rpm area.

 

The TPS tells the ECU the position of the throttle valve, which is important when the ECU changes modes between light load 'CO' mode and closed loop, lambda sensor controlled mode. There appears to be blending between modes, but the feedback from the TPS is always being considered.

 

Basically, try it at 14 and try it at 17, take it for a run and pay attention to the whole rev range. If you don't get 100 at maximum throttle then fueling at the top end may be affected

[adamg]

I am not aware that anyone has suggested that 14 is better or worse than 17. You can adjust the low revs fuel with the CO settings as you know, so there is no need to fool the ecu using the TPS range. You just don't want the range outside the recommendations, eg the max being 89 as you would be limiting the top end.

[fixitsan]

You just don't want the range outside the recommendations, eg the max being 89 as you would be limiting the top end.

 

I agree here, but then I don't know how much of top end fueling is controlled by the TPS and how much is controlled by the intake pressure sensor. ...But now that I think of it, the pressure sensor output for a wide open throttle will probably be identical to a throttle at 98% at lower revs, so TPS control might well be the important thing at top end revs

[frits44]

adamg and fixitsan Thanks for the answers,

 

I was wondering if adjusting the  TPS sensor changes things on your bike.

I leave it this way, TPS sensor goes from 15 to 97.

My bike still runs great.

 

Again THANKS 

 

Greetings, Frits from Holland

[adamg]

I haven't tried fiddling with the TPS, Frits. The bike is with HM Racing today to have a PC3 fuelling map done. I'll let you know where in the rev range my bike required more/less fuel over standard.

[arthurbikemad]

I haven't tried fiddling with the TPS, Frits. The bike is with HM Racing today to have a PC3 fuelling map done. I'll let you know where in the rev range my bike required more/less fuel over standard.

 

 

Phone flipped the vid, cant be assed to rerender it.

Edited by arthurbikemad, 20 June 2016 - 10:07 am.

[adamg]

Nice!!

 

 

 

Phone flipped the vid, cant be assed to rerender it.

[frits44]

I haven't tried fiddling with the TPS, Frits. The bike is with HM Racing today to have a PC3 fuelling map done. I'll let you know where in the rev range my bike required more/less fuel over standard.

 

adamg ok,

 

Today I measured my TPS sensor from my 2010 TDM 900, I measured with full throttle 2,43 K ohm on pin 2 and 3. pin 1 and 2 also 2,43 K ohm.

This is strange because on the side of JBX the value must   be  4 K ohm to 6 K ohm max.( 2002 model )

So I went to my local dealer and measured a new TPS sensor, it is also 2,43 K ohm max.

I think it has to do with the new model and the leaner ECU.

My bike runs great, it is strange these different values on the TPS sensor

Maybe the old models and new models are different, I do not know.

What do you think about this??

 

Greetings, Frits from holland 

[JBX]

2008 to 2010 TDM have the same TPS as the FJR1300 (3P6-85885-00).

It has the same maximum resistance (4k - 6k) than the previous TPS (5PS-85885-01)

 

The YZF-R1 TPS has a max resistance value of 2k - 3k, but I don't know if it can fit on a TDM.

It may be possible that this TPS was wrongly put on your TDM.

 

Anyway the most important thing is that the ECU is able to get a position value from the TPD, no matter the max resistance is exposes, as this is mainly a voltage divider. If the DIAG mode gives you the correct min & max figures then you're ok.

[frits44]

JBX thanks for the answer,

 

I have the TPS sensor nr. 3P6-85885-00 on my bike, and I measured it 3 times and the value is max 2,43 K ohm.

Diag mode is 15 up to 97.

 

Again thanks for the answer.

 

Greetings,Frits from holland

[PeterM91]

Maybe it is useful to set the TPS to the highest possible value, with the throttle closed that is.

This is done with KTM's: http://www.tpstool.com/

It makes them run a bit better they say. More info: http://www.thumperta...ustment-thread/

Just a thought.

Anyway, my 900 is set at 17 in the diag display and it runs pretty smooth

[JBX]

JBX thanks for the answer,

 

I have the TPS sensor nr. 3P6-85885-00 on my bike, and I measured it 3 times and the value is max 2,43 K ohm.

Diag mode is 15 up to 97.

 

Again thanks for the answer.

 

Greetings,Frits from holland

 

You should check the linearity of the TPS, I would have some doubts on a TPS that have half the correct max value.

 

Linearity = output voltage vs rotating angle : it should be linear, no peaks, drops or flats.