Toyota VVT solenoid (Oil Control Valve)

[Wolf_Tm]

Hi,
any idea how to connect and drive Toyota VVT/OCV solenoid valves?
On the Toyota electric wiring map, this solenoid valve has 2 pins (OCV+ and OCV-) and both are connected DIRECTLY to the oem ecu.
Thanks
Wolf

[VEMS]

Hello Wolf_TM,

Do you have a bit more info about these solenoids, perhaps oem schematic link or engine code so i review against known configuration ?

Best regards, Dave

[Wolf_Tm]

Hello Wolf_TM,

Do you have a bit more info about these solenoids, perhaps oem schematic link or engine code so i review against known configuration ?

Best regards, Dave

Hi Dave,
I do have the oem wiring diagrams, but there is nothing more than both the 2 wires from the solenoid going to the ecu!




Engine code is 3SGE BEAMS, but almost the same solenoid is also used in other Toyota applications like the 1ZZ-FE engine.
Is there any test I could do on the solenoid to help you help me?
Thanks

[Kamuto]

use + from ignition

[Wolf_Tm]

use + from ignition

Ok, thanks Kamuto.
Any special setting in Vems tune to drive them?

[Kamuto]

you will need diode on this output + select frequency when they works best

[Wolf_Tm]

you will need diode on this output + select frequency when they works best

So you mean OCV+ to a switched 12v and OCV- to diode to a 12V drive ignition output, for example?
What kind of diode?
Thanks

[Denmark]

The diode is in the rescue kit

[Wolf_Tm]

The diode is in the rescue kit

Ok, must ask the customer to look for it... thanks!

[Wolf_Tm]

Hi,
few questions about how VEMS controls the VVT solenoid.

1. is there a function to disable VVT solenoid when engine is warming? At cold oil (higher viscosity) idling is difficult because of the valve timing continuosly changing, as it would need a setup totally different from hot oil.

2. question about VEMS PID.
I noticed that I can't get all the solenoid DC, needed to get to the target VVT angle, just by using the Proportional gain, but it only arrives up to 25% DC.
And to get up to the rest of the needed DC (around 50%) I absolutely need to add some Integral.
It's a very strange PID behaviour, compared to others ecus.

3. is it ok to have the sectrig position +/-1.5° from the camshaft target value? Wasn't able to do any better..

[Kamuto]

Hi,
few questions about how VEMS controls the VVT solenoid.

1. is there a function to disable VVT solenoid when engine is warming? At cold oil (higher viscosity) idling is difficult because of the valve timing continuosly changing, as it would need a setup totally different from hot oil.

2. question about VEMS PID.
I noticed that I can't get all the solenoid DC, needed to get to the target VVT angle, just by using the Proportional gain, but it only arrives up to 25% DC.
And to get up to the rest of the needed DC (around 50%) I absolutely need to add some Integral.
It's a very strange PID behaviour, compared to others ecus.

3. is it ok to have the sectrig position +/-1.5° from the camshaft target value? Wasn't able to do any better..

upload log

[Wolf_Tm]

Hi,
few questions about how VEMS controls the VVT solenoid.

1. is there a function to disable VVT solenoid when engine is warming? At cold oil (higher viscosity) idling is difficult because of the valve timing continuosly changing, as it would need a setup totally different from hot oil.

2. question about VEMS PID.
I noticed that I can't get all the solenoid DC, needed to get to the target VVT angle, just by using the Proportional gain, but it only arrives up to 25% DC.
And to get up to the rest of the needed DC (around 50%) I absolutely need to add some Integral.
It's a very strange PID behaviour, compared to others ecus.

3. is it ok to have the sectrig position +/-1.5° from the camshaft target value? Wasn't able to do any better..

upload log

Hi,
issue #1 solved by lowering target angle.

But now i'm fighting again a worse issue.
VVT solenoid starts to change camshaft timing when around a minimum of 40%, that is to say no angle change from 0 to 40% DC.
Problem is that it gets a pair of seconds to get from 0 to 40%, even with maximum Proportional gain, so it's like VVT disabled in shorter gears.
Would be very handy to have a minimum/maximum allowable DC even for VVT solenoid, so that PID could start working from 40% DC (in my case), or even a Normal Position DC table to help PID to get faster to the target.
Camshaft Angle control/Reference position is already at 50%, but changing it was of no help (changed nothing).
Is there any other way to solve that?

Thanks

[Kamuto]

Hi,
few questions about how VEMS controls the VVT solenoid.

1. is there a function to disable VVT solenoid when engine is warming? At cold oil (higher viscosity) idling is difficult because of the valve timing continuosly changing, as it would need a setup totally different from hot oil.

2. question about VEMS PID.
I noticed that I can't get all the solenoid DC, needed to get to the target VVT angle, just by using the Proportional gain, but it only arrives up to 25% DC.
And to get up to the rest of the needed DC (around 50%) I absolutely need to add some Integral.
It's a very strange PID behaviour, compared to others ecus.

3. is it ok to have the sectrig position +/-1.5° from the camshaft target value? Wasn't able to do any better..

upload log

Hi,
issue #1 solved by lowering target angle.

But now i'm fighting again a worse issue.
VVT solenoid starts to change camshaft timing when around a minimum of 40%, that is to say no angle change from 0 to 40% DC.
Problem is that it gets a pair of seconds to get from 0 to 40%, even with maximum Proportional gain, so it's like VVT disabled in shorter gears.
Would be very handy to have a minimum/maximum allowable DC even for VVT solenoid, so that PID could start working from 40% DC (in my case), or even a Normal Position DC table to help PID to get faster to the target.
Camshaft Angle control/Reference position is already at 50%, but changing it was of no help (changed nothing).
Is there any other way to solve that?

Thanks

for idling leave solenoid in resting position never had issue like yours, especialy with toyotas, + 1.2.36 software has better cam control even perfect controll

[Wolf_Tm]

VVT solenoid starts to change camshaft timing when around a minimum of 40%, that is to say no angle change from 0 to 40% DC.
Problem is that it gets a pair of seconds to get from 0 to 40%, even with maximum Proportional gain, so it's like VVT disabled in shorter gears.
Would be very handy to have a minimum/maximum allowable DC even for VVT solenoid, so that PID could start working from 40% DC (in my case), or even a Normal Position DC table to help PID to get faster to the target.
Camshaft Angle control/Reference position is already at 50%, but changing it was of no help (changed nothing).
Is there any other way to solve that?

Thanks

for idling leave solenoid in resting position never had issue like yours, especialy with toyotas, + 1.2.36 software has better cam control even perfect controll

1.2.31 is the latest fw web tool finds... where can Iind the 1.2.36?!

[Kamuto]

newest vemstune
http://www.vems.hu/download/v3gui/NIGHTLY/VemsTune-Install-2016-10-01.exe
http://www.vems.hu/wiki/index.php?page=GenBoard/UnderDevelopment/FirmwareChanges
put it into webcache/fw folder in vemstune install, install over firmware web tool