WRC Diff controller, how dose this work
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From: barry-south wales
well you got speed sensors on each wheel,, which feed into a control unit!
the control unit (ecu) has scenarios maps, much like a engine ecu,,IF this IS this THAN output that, if you know what i mean!
the output from the diff ecu then controls a hydraulic control valve, which in turn is operating the diff
is that what you want?
the control unit (ecu) has scenarios maps, much like a engine ecu,,IF this IS this THAN output that, if you know what i mean!
the output from the diff ecu then controls a hydraulic control valve, which in turn is operating the diff
is that what you want?
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From: barry-south wales
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Joined: Jul 2004
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From: Lancaster, Lancs
That topic doesn't really cover the wrc active diffs...
The system(s) has input from l/h & r/h wheel speed, front and rear prop speed, brake pressure and throttle position...it looks at pump pressure, and each diff pressure....
Centre diff controlller alters the characteristics the diff displays between the front and rear split, there are times when it is advantageous to lock and unlock the centre diff....handbraking, corner approach, corner exit etc...
Front diff...a little more interesting, we can alter the 'allowance' the amount the diff slips and the 'ramp' this alters the ramp angles in other words how the diff locks and unlock under acceleration and deacceleration.
The escort fully active car only has 2 active diffs, the front and centre. Only the suburu s11 had an active rear diff.
The system is fed by a two stage 100 bar pump, one stage does the power steering the other stage feeds the main valve block.
The main valve block controls the initial pressure bleeding back to the tank at 90 bar and distributing hyd fluid onto the 2 subs valve block...one for each diff.
The sub valve blocks house, pressure transducer, relief valve set at 15 bar and the control valve(generally called a rexroth valve), its these valves that are being controllled by its corresponding ecu (front & centre)
Thats it in a nutshell..most of the gear is in the pic on the bottom r/h side of the engine bay.
Ian
The system(s) has input from l/h & r/h wheel speed, front and rear prop speed, brake pressure and throttle position...it looks at pump pressure, and each diff pressure....
Centre diff controlller alters the characteristics the diff displays between the front and rear split, there are times when it is advantageous to lock and unlock the centre diff....handbraking, corner approach, corner exit etc...
Front diff...a little more interesting, we can alter the 'allowance' the amount the diff slips and the 'ramp' this alters the ramp angles in other words how the diff locks and unlock under acceleration and deacceleration.
The escort fully active car only has 2 active diffs, the front and centre. Only the suburu s11 had an active rear diff.
The system is fed by a two stage 100 bar pump, one stage does the power steering the other stage feeds the main valve block.
The main valve block controls the initial pressure bleeding back to the tank at 90 bar and distributing hyd fluid onto the 2 subs valve block...one for each diff.
The sub valve blocks house, pressure transducer, relief valve set at 15 bar and the control valve(generally called a rexroth valve), its these valves that are being controllled by its corresponding ecu (front & centre)
Thats it in a nutshell..most of the gear is in the pic on the bottom r/h side of the engine bay.
Ian
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Originally Posted by sibster
That topic doesn't really the wrc active diffs...
The system(s) has input from l/h & r/h wheel speed, front and rear prop speed, brake pressure and throttle position...it looks at pump pressure, and each diff pressure....
Centre diff controlller alters the characteristics the diff displays between the front and rear split, there are times when it is advantageous to lock and unlock the centre diff....handbraking, corner approach, corner exit etc...
Front diff...a little more interesting, we can alter the 'allowance' the amount the diff slips and the 'ramp' this alters the ramp angles in other words how the diff locks and unlock under acceleration and deacceleration.
The escort fully active car only has 2 active diffs, the front and centre. Only the suburu s11 had an active rear diff.
The system is fed by a two stage 100 bar pump, one stage does the power steering the other stage feeds the main valve block.
The main valve block controls the initial pressure bleeding back to the tank at 90 bar and distributing hyd fluid onto the 2 subs valve block...one for each diff.
The sub valve blocks house, pressure transducer, relief valve set at 15 bar and the control valve(generally called a rexroth valve), its these valves that are being controllled by its corresponding ecu (front & centre)
Thats it in a nutshell..most of the gear is in the pic on the bottom r/h side of the engine bay.
Ian
The system(s) has input from l/h & r/h wheel speed, front and rear prop speed, brake pressure and throttle position...it looks at pump pressure, and each diff pressure....
Centre diff controlller alters the characteristics the diff displays between the front and rear split, there are times when it is advantageous to lock and unlock the centre diff....handbraking, corner approach, corner exit etc...
Front diff...a little more interesting, we can alter the 'allowance' the amount the diff slips and the 'ramp' this alters the ramp angles in other words how the diff locks and unlock under acceleration and deacceleration.
The escort fully active car only has 2 active diffs, the front and centre. Only the suburu s11 had an active rear diff.
The system is fed by a two stage 100 bar pump, one stage does the power steering the other stage feeds the main valve block.
The main valve block controls the initial pressure bleeding back to the tank at 90 bar and distributing hyd fluid onto the 2 subs valve block...one for each diff.
The sub valve blocks house, pressure transducer, relief valve set at 15 bar and the control valve(generally called a rexroth valve), its these valves that are being controllled by its corresponding ecu (front & centre)
Thats it in a nutshell..most of the gear is in the pic on the bottom r/h side of the engine bay.
Ian
i may come over next week to have a look
Originally Posted by sibster
I need a kick up the arse Mark so feel free to drop in......and dont forget your cheque book 
i'll ring you next week before i come up, are you working during the days away from home ? im off work to do my own car, but might as well come and watch someone else work
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Joined: Jul 2004
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From: Lancaster, Lancs
Seriously Mark, if you are available I might need to have a run up the road in the car with you monitoring the lappy...my gems display aint here yet and im anxious to just try a few things.....give us a bell when you have some time...i can leave work anytime.
Originally Posted by sibster
Seriously Mark, if you are available I might need to have a run up the road in the car with you monitoring the lappy...my gems display aint here yet and im anxious to just try a few things.....give us a bell when you have some time...i can leave work anytime.
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From: Warsaw, Poland
Originally Posted by sibster
The escort fully active car only has 2 active diffs, the front and centre. Only the suburu s11 had an active rear diff.
Xsara WRX 206 and 307WRC, Focus RS WRC 2005 even Skoda Fabia WRC have all 3 active diffs.
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