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S60 & V60 '18> / XC60 '17> / S90 & V90 '16> / XC90 '15> General Forum for the SPA-platform 60- and 90-series models |
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Another PowerPulse blowout...Views : 4612 Replies : 41Users Viewing This Thread : |
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Dec 16th, 2019, 00:34 | #11 |
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I think they can go at anytime, regardless of whether the pump is running or not. There must be a safety blow-off valve otherwise we'd be driving around in a potential bomb!
I had one replaced about a month ago. The service manager said that they are now replacing burst pipes with upgraded pipes. So Volvo must have identified a manufacturing fault with the original pipes that is causing them to fail, rather than system over-pressure bursting them.
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Dec 16th, 2019, 09:39 | #12 |
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As Clan mentioned, there's no valve between the receiver tank and hose so whatever pressure is maintained in the tank by the pump is also present in the full length of hose up to the turbo's PP inlet valve next to the engine.
There will be a pressure actuated switch on the receiver which will shut off the pump at 250psi (value quoted by Clan) so unless *that* switch malfunctions, the hose pressure will not exceed 250psi. Clearly the crimped joints between hose and unions are not fit for purpose given the conditions in which they are expected to operate - vibration, rapid temperature changes, heat, and pressure. These conditions are hardly unique, otherwise similar fittings would be failing all over industry. When I booked the car in this morning, the service chap also mentioned Volvo has updated the pipe so time will tell if this recurring problem has been solved once and for all. My only concern now is that my compressor pump will be running continuously until the hose is replaced on Friday. Steve
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Dec 16th, 2019, 10:23 | #13 | |
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Dec 16th, 2019, 10:44 | #14 | |||
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Dec 16th, 2019, 11:29 | #15 | |
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@scw: I have also seen pics of a blown hose (armored rubber part - not the alu joint..) so clearly the whole assembly is not fit for purpose.. And they seem to be replacing it with a same part.. It's quite embarrassing that something that was announced as a revolutionary innovation in turbodiesel technology- has become a synonymous for failure.. And by having discontinued it after 2-3 yrs Volvo has admitted the failure.
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Dec 16th, 2019, 11:52 | #16 | |
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The reason that have now discontinued powerpulse is that there is now an electric motor to help the torque at low rpm instead .. it hasn't admitted failure , technology moves on !
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Dec 16th, 2019, 12:16 | #17 |
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Well, if it blows the hose- it means the pressure exceeded the hose rating - which, I hope, is more than the operating pressure of 19 bar. So I assume it blows because the pump doesn't stop at 19 bar.
Clan, you know that I love Volvos- love the cars, love the brand, love their philosophy in general. But hybrid powertrains have existed loooong before PP was invented- even mild hybrids are older than PP. Volvo introduced PP - and after a 3 yr run- they went mainstream, discontinued the air pump and went hybrid- like virtually all other car manufacturers.. Reminds me of the infamous VW G-ladder saga..
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Dec 16th, 2019, 12:27 | #18 | |
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It is only recently that an electric motor has been added to assist the engine itself ( actually its the high voltage Alternator used as a motor ... ) Volvo also have a motor / generator in the flywheel on the upper hybrids .. Have a trouble free Christmas anyway ! Best wishes 🎅
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Dec 16th, 2019, 12:51 | #19 |
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Some additional info for those interested:
Power Pulse is initiated when the following conditions are met:
Filling the system after a pulse takes about 40 seconds. Time to fill the system from being completely empty (1 bar) to 19 bar takes about 80 seconds. Two successive pulses are normally available. As well as the safety valve, there is a an over-temperature sensor on the compressor which operates at 125C. This isn't a permanent error condition so when the temperature subsequently falls below about 120C the compressor will resume operation. No errors or messages concerning PP are displayed to the driver. _
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Dec 16th, 2019, 13:00 | #20 | |
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