Load sensing OC steering

Hi. I am installing a 10 l/m valve package with similar features to the pgv16, but from the Hawe brand. I know that each brand behaves differently, but could you tell me what pwm and gain values ​​you use? It is to try something that works and then adjust with use. So far I have used a bang bang valve, it works but does not have a precise operation and a small correction can move the wheels more than desired and therefore the line is straight but not perfect. It is very difficult for such a valve to send just a little oil when necessary. So I change to proportional valve with LS line to install in a JD-7610

Proportional definitely mandatory…

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Hi @nut
Can you tell me if the 10L/min spool is fast enough for U-trun?

I have quoted an Danfoss PVG32 15L/min with PVEA, PVEH or PVEP control.
With PVEA price is 1400 CAD
With PVEH or PVEP 1700 CAD
PVEP works with a PWM for each side (standard code) PWM 10% to 80%, 4% max hysteresis.

It’s a little more than my Hydraforce setup at 700 CAD but would give better flow control I think.
Or maybe current control would give very accurate flow control to?

Pity the money! Proportional Cetop with compensator provides sufficiently accurate control.

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More than enough I’d say. Ran some tests with duals in the summer and it turns really fast.

But agree with @baraki that you get probably good enough control with cetop propo and PWM drive. Benefit of PVE series is the spoom displacement feedback control so you get rid of temperature and viscosity dependence.

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Yeah, but I fund nothing affordable here in Canada. I was quoted over 1300 CAD (1000 US) just for the valve! Atos and Argo Hytos. I saw an Hydac on the Internet for the same price.

Did someone fund Prop cetop valve at decent price in Canada?
@baraki You are in Poland? Prices seem to be great there!
I ordered Corteco seals from Poland last time, was much cheaper and delivered in 5 days! :+1:

An other option is the new Walvoil SDX060 at 900 CAD.

Yeah and I am ready to pay a little more to be able to have precise little movements when driving AB line. The hydraforce is good but I would like it deliver less oil for very small corrections. The min PWM has to be set high enough to move in every condition so the valve movement are not as smooth than manual driving or even compared to a JD autotrack system.

With that info I would say the Hydraforce SP-10 is to big, a SP08-58D is maybe enough (rated 8L/min I think).

I saved more than 5000 CAD on the GPS side for each tractor so I can invest a little in the valve! :wink:

Take a look at the EDL proportional distributor with flow control. Hawe brand (Germany). With spool of 15 l / m or 10 l / m it costs about 850US in europe.

I am puzzled here. You refer to EDL, but to me it seems that proportional type is called PSL. Please explain how the EDL type works.
https://www.google.com/url?sa=t&source=web&rct=j&url=https://www.servi.no/media/kghbiylh/hawe-proportional-directional-spool-valve-type-psl-psv-pslf-psvf-overview.pdf&ved=2ahUKEwihoavmk6zvAhXIwAIHHZe6DYU4ChAWMAJ6BAgIEAI&usg=AOvVaw3CkrFoasqrZHKAq9xqJHTo

Hi
here:
Hawe Hydraulik EDL
It seem to be a great compact valve, similar to the Walvoil SDX060.
Both modular, configurable for open or closed center with LS relief valve if you want.

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in the product image the block with two slides appears, since it is modular, but in our case only one is necessary.
This compact block admits slides up to 48 l / m. I have bought it with a 10 l / m slide. I will receive it next week. When I can assemble it, I will tell you how it works. I think it’s Nut who has worked with 10l / m and it seems to be fine for conventional tractors. the possible disadvantage (I am not saying it will happen) when choosing 10 l / m instead of a higher flow rate, is that it can be a little slow in the U-turns, but instead offers a much more precise and gentle control for small fixes when driving on the AB line. I hope it performs well in both cases, but good steering control while driving on the line is more important to me.

10 l/min flow seems more than fast enough for u-turns even with duals on. Theoretically you get around one turn of steering wheel per second assuming 160 cc orbitrol but the steering feels a lot faster with the EH valve.

Now I have a PVEA-CI actuator on order so I’ll move the controls to canbus for the valve.

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Looking forward to hear from you, what the excact numbers are for the parts.
The last lines in this text is what worries me:
1 Overview proportional directional spool valve type EDL
Proportional directional spool valves are a type of directional valve. They control
the direction of movement and the velocity of individual or multiple hydraulic
consumers actuated simultaneously. Control is independent of the load and
continuous.
The directional spool valve type EDL with series connection is actuated directly.
The flows for the individual consumers can be individually adjusted. By means of
additional functions in the intermediate plates (longitudinal and sandwich valve
combination) and ancillary blocks the proportional directional spool valve can be
flexibly adapted to different control tasks.
The directional spool valve type EDL can be combined directly with the
proportional directional spool valve type PSL and PSV in size 2. It is used in
mobile hydraulics, in particular in civil engineering and hydraulic tools.

It is the same text under part 1 in your d8086-es.pdf.

El distribuidor pilotado EDL esta disponible para caudal fijo y caudal variable, PSL y PSV. Al ser pilotado, debe ser accionado por correderas proporcionales con palanca (tradicionales) o con solenoides. Es en esta parte de las correderas cuando se elije el caudal de funcionamiento, teniendo en cuenta que el maximo para el tipo EDL son 48 L/m.

Esa es la referencia de la valvula del pedido.
Cada linea hace referencia a las configuraciones elegidas. Pedí el de 10 litros (10/10) no el de 16/16 que aparece en la referencia.

I have a hydraulic valve system set up on my tractor. I have a pressure switch on the ls line to the orbital for disengagement. What is the correct place to connect the wiring to? I have thee two wires connected to ground and signal of the encoder pins and set the pulse to one but I can’t get it to disengage.

Version of AOG? This should work.

You can also try this (if you use AOG v5.5 you will have a bar to see the response):
Feed your switch with 3.3 or 5V and connect to A0, pull this side down with something live a 5k resistor.
Then you can use “pressure sensor” in AOG.

It is the latest version 5.5 I think. When the pressure switch is closed it does briefly turn the arrow in the bottom right of the screen from green to red but it always goes back to green after half a second

Auto disengage don’t work with “switch” must be “button”(or the other way around), I think.
Otherwise, this would reengage autosteer as soon pressure drop.
Be sure to also load the v5.5 ino, it’s a new one, slightly different for the switch/steer disengagement management.

Ok that sounds like my problem alright. So I am best to connect it to a0 with a pull down resistor?

It will not solve your problem with reengaging automaticaly.
1- you can try the v5.5 ino, to see how it works

Now I assume you are have a switch that stay closed of autosteer engagement, not an momentary.
So you can:
1-modify the ino to force the engage switch to cycle OFF/ON after an disengagement(maybe a feature request)
2- use an other switch to give just a quick signal (like a spring loaded one).

Can you give more detail about the type of switch you are using?

The switch I used is just a basic on off adjustable pressure switch. I can wire it either normally open or closed. I have it connected normally open. Why would you want it to re engage automatically? I need it to disengage when the steering wheel is turned and only re engage when the autosteer button on the screen is pressed.