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SMG Share thread
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<blockquote data-quote="redhybrid" data-source="post: 671665" data-attributes="member: 24255"><p>ya have a good weekend! all...manual...yeahh..its the best! considering all the headache having to think "whats gonna fail next?"</p><p></p><p>ok...here goes how SMG actuation system works. things might get little confuse with pump hydraulic bla bla bla..</p><p></p><p><img src="http://i1126.photobucket.com/albums/l620/redhybrid/smgPFD.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>thanks bmwfans info for the picture, it shows how the pentosin (hydraulic fluid) been route/tube/hose.</p><p></p><p>the most bottom part under number 6 is actually the real pump that take pentosin from reservoir tank (under item 9). I called the pump electro hydraulic just because its been powered by 12V(electric) to pump hydraulic pentosin to accumulator (item 1 in below picture), creating hydraulic pressure that will kick the clutch actuator(below no 5), and shift actuator (right side of item 4). This accumulator will contains at least 35 bar and maximum 50bar of hydraulic pressure, so only the electro hydraulic pump is doing the pumping.</p><p></p><p>Some mech will call clutch actuator as clutch pump but it doesnt do pumping actually. That big metal hydraulic block on the left side is controlling the pressure from accumulator (using solenoid valve - item 10, 11 and 12 in below picture), once activated, will allow hydraulic pressure to push the piston inside of the clutch actuator.</p><p></p><p>Same for Shift actuator - 2 or maybe 3 solenoid valves been assigned to control to control the pressure going into that shift actuator.</p><p></p><p>So once this pressure inside the accumulator been used, of course there will be reduce of pressure and once it is lower than 30bar, ECU will power up the electro-hydraulic pump again to accumulate the pressure. Think of this accumulator as battery and it needs recharge. And it goes on and on, if the clutch is always using pressure and shifting somemore.</p><p></p><p>after the cycle complete, this hydraulic pressure will not return to accumulator but its been bleed back to the reservoir tank and waiting to be pumped again to the accumulator.</p><p></p><p><img src="http://i1126.photobucket.com/albums/l620/redhybrid/accumulator.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>i give an example. When we start to engage C and as for a 1st gear:-</p><p></p><p>1. ECU will trigger Solenoid valve for clutch actuator and pressure inside acculumator will run to push the clutch actuator.</p><p>2. at the same time, solenoid valve for shift actuator will also be activated and allow the pressure goes in to kick the shift to the first gear.</p><p>3. Pressure will stay inside the clutch actuator until we hit the throttle.</p><p>4. Depending on what is throttle position feedback to ECU, ECU will trigger the solenoid discharged the hydraulic pressure to release the clutch accordingly.</p><p>5. Finally, the hydraulic will return to the reservoir tank.</p><p></p><p></p><p>anybody care for TT this weekend!?</p><p></p><p>Btw infinityKL, i got new clutch when i sent my car for clutch actuator seal kit change (cant afford new clutch actuator, RM4k worr). Ah wai said that the old clutch can t be used since it was spoiled/spilled with hydraulic. </p><p></p><p>Yeah...more spice... following picture is my sketch on schematic diagram - i post this on page 36-37 i cant remember.</p><p></p><p><img src="http://i1126.photobucket.com/albums/l620/redhybrid/SMGhydraulicandsignalschematic.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Cheers and Have a good weekend!!!</p></blockquote><p></p>
[QUOTE="redhybrid, post: 671665, member: 24255"] ya have a good weekend! all...manual...yeahh..its the best! considering all the headache having to think "whats gonna fail next?" ok...here goes how SMG actuation system works. things might get little confuse with pump hydraulic bla bla bla.. [IMG]http://i1126.photobucket.com/albums/l620/redhybrid/smgPFD.png[/IMG] thanks bmwfans info for the picture, it shows how the pentosin (hydraulic fluid) been route/tube/hose. the most bottom part under number 6 is actually the real pump that take pentosin from reservoir tank (under item 9). I called the pump electro hydraulic just because its been powered by 12V(electric) to pump hydraulic pentosin to accumulator (item 1 in below picture), creating hydraulic pressure that will kick the clutch actuator(below no 5), and shift actuator (right side of item 4). This accumulator will contains at least 35 bar and maximum 50bar of hydraulic pressure, so only the electro hydraulic pump is doing the pumping. Some mech will call clutch actuator as clutch pump but it doesnt do pumping actually. That big metal hydraulic block on the left side is controlling the pressure from accumulator (using solenoid valve - item 10, 11 and 12 in below picture), once activated, will allow hydraulic pressure to push the piston inside of the clutch actuator. Same for Shift actuator - 2 or maybe 3 solenoid valves been assigned to control to control the pressure going into that shift actuator. So once this pressure inside the accumulator been used, of course there will be reduce of pressure and once it is lower than 30bar, ECU will power up the electro-hydraulic pump again to accumulate the pressure. Think of this accumulator as battery and it needs recharge. And it goes on and on, if the clutch is always using pressure and shifting somemore. after the cycle complete, this hydraulic pressure will not return to accumulator but its been bleed back to the reservoir tank and waiting to be pumped again to the accumulator. [IMG]http://i1126.photobucket.com/albums/l620/redhybrid/accumulator.png[/IMG] i give an example. When we start to engage C and as for a 1st gear:- 1. ECU will trigger Solenoid valve for clutch actuator and pressure inside acculumator will run to push the clutch actuator. 2. at the same time, solenoid valve for shift actuator will also be activated and allow the pressure goes in to kick the shift to the first gear. 3. Pressure will stay inside the clutch actuator until we hit the throttle. 4. Depending on what is throttle position feedback to ECU, ECU will trigger the solenoid discharged the hydraulic pressure to release the clutch accordingly. 5. Finally, the hydraulic will return to the reservoir tank. anybody care for TT this weekend!? Btw infinityKL, i got new clutch when i sent my car for clutch actuator seal kit change (cant afford new clutch actuator, RM4k worr). Ah wai said that the old clutch can t be used since it was spoiled/spilled with hydraulic. Yeah...more spice... following picture is my sketch on schematic diagram - i post this on page 36-37 i cant remember. [IMG]http://i1126.photobucket.com/albums/l620/redhybrid/SMGhydraulicandsignalschematic.jpg[/IMG] Cheers and Have a good weekend!!! [/QUOTE]
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