Model: Configure automatic transmission of 1.5T engine and 6F35.
Travel course of development: 58790km.
Breakdown phenomenon:
Client report car appears the window leaves to be able to be heard after travel receives accelerator quickly " Zhi Zhi " metallic noise.
Breakdown diagnoses:
After receiving Che Weixiu, mix above all client a test-drive, drive via what cross a client the road tries, can hear below the case that opens a window really apparent " Zhi Zhi " metallic noise, car travel arises because of having turn when relying on near side to have a section of a highway that prevents counterfort, sound is more clear. Shut a window not to listen to afore-mentioned abnormal knocking. Rotate speed of the engine in accelerating a process through iteration test-drive discovery receives accelerator quickly after 3000r/min more than, and speed is in 40~60km/h is most apparent.
Speed is exorbitant because wind a confusion of voices is too big not apparent, speed is too low cheer duration of the abnormal knocking after receiving accelerator very short not easy also resolution. And appear inside a paragraph of very short time after test-drive discovers abnormal knocking is receiving accelerator again only, quicken process and divide evenly fast travel abnormal knocking did not appear.
Through analysing abnormal knocking occurrence condition:
① appears when accelerator closes quickly after engine rotate speed exceeds 3000r/min;
② quickens drive a vehicle and divide evenly fast travel abnormal knocking all appears reach abnormal knocking to be in only window ability is heard " Zhi Zhi " ringing metal noise.
Eliminated the possibility of occurrence abnormal knocking of travel system and chassis system, abnormal knocking should be mixed engine system or transmission system are relevant. Whether to matter with transmission system to affirm, block car park P, repeatedly trample quickens footplate to reach receive accelerator quickly, also can hear in engine cabin when accelerator closes quickly after engine rotate speed exceeds 3000r/min " Zhi Zhi " metallic noise. The course is used stethoscopic for many times auscultation affirms, abnormal knocking is in in turbine supercharger most apparent, if pursue,1 is shown.
A powerful person belongs to the pressure release of turbine supercharger exhaust of this engine to often leave model negative pressure control, start namely when working, pressure release a powerful person is in exhaust to often open the position. When engine works, PCM passes the information such as bear of engine rotate speed, engine and speed signal to control reduce pressure of turbine supercharger waste gas a powerful person of door adjustment electromagnetism, decompression door adjusts electromagnetism a powerful person adjusts a powerful person of pressure release of waste gas of control turbine supercharger is carried out implement the bulk that vacuum spends.
Through adjusting waste gas is carried out implement vacuum will control standard of pressure boost pressure. Want to create pressure of the biggest pressure boost, coil of electromagnetism of control valve of door of decompression of waste gas of supercharger of PCM control turbine is carried out to door of decompression of turbine supercharger waste gas implement bring to bear on complete vacuum.
Do not work in engine below condition, door of decompression of turbine supercharger waste gas is carried out implement medium bedspring pressure can acquiesce to move door of decompression of turbine supercharger waste gas the place that reachs to be opened completely.
The system that take energy of life installed by-pass valve of supercharger of a turbine. When solar term door is shut, this by-pass valve is opened, the air after pressure boost will return turbine to pressure boost takes gas side and undertake recycle with air of the side that take energy of life. Such meetings reduce turbine arrearage phenomenon, rise to quicken and optimize the function of engine. Give out from heard turbine supercharger " Zhi Zhi " the working principle that metallic noise integrates turbine supercharger is knowable appear the reason has the possibility of this kind of abnormal knocking: Turbine lamina brings about turbine supercharger unbalance as a result of eyewinker or attaint; Turbine bearing invalidation; Invalidation of turbine supercharger by-pass valve; Space of gate of turbine waste gate passes to wait greatly.
Act on by arrive easily difficult principle, disassemble by-pass valve first, the test-drive after disassembling, abnormal knocking appears as before.
Check by-pass valve to issue can normal open to did not discover phenomenon of unusual card sluggish in the condition of electrify at the same time, the platoon works besides by-pass valve unusual the abnormal knocking that brings about because of vapour lock when receiving accelerator.
Check waste gas reduce pressure next a powerful person of door adjustment electromagnetism is carried out to a powerful person of waste gas pressure release implement the vacuum tube road between also did not see fall off reach craze flat phenomenon, at the same time a powerful person of waste gas pressure release is carried out implement push rod also did not see be out of shape apparently. Tear open next turbine supercharger, examination turbine lamina also did not see be out of shape apparently, the hand moves rotational turbine lamina to also do not have phenomenon of occurrence card sluggish. The mobile clearance that checks waste gate door though the bring into contact with when peace does not have very clear distinction, but can feel really than other a little Song Kuang a few, do not know whether this kind a little the difference can be denied bring about appear the abnormal knocking that narrates in this case, if pursue,2 are shown.
In turbine supercharger the examination is less than apparent breakdown to nod, turbine supercharger charge changes in the meantime bigger also, by waste gas decompression open of control of a powerful person of door adjustment electromagnetism shuts consider this valve, whether can occurrence breakdown of this electromagnetism a powerful person bring about the occurrence of abnormal knocking? Holding trying state of mind in the arms waste gas decompression outlet of a powerful person of door adjustment electromagnetism unplugs below, the car that start, cheer the door to reach repeatedly receive accelerator quickly, for many times test-drive, original abnormal knocking appears no longer. After the waste gas decompression of breakdown car at the same time a powerful person of door adjustment electromagnetism assembles normal car, cheer the door to reach repeatedly receive accelerator quickly, appeared on normal traffic similar a bit small " Zhi Zhi " metallic noise.
Because door of waste gas decompression adjusts,judging abnormal knocking from this is electromagnetism a powerful person works unusual be caused by, change door of waste gas decompression adjusts the breakdown after electromagnetism a powerful person is able to eliminate.
Breakdown summary:
Above all this car appears " Zhi Zhi " because by-pass valve open arrives,metallic noise abnormal knocking is certain level when lid of a powerful person of air current concussion makes a powerful person builds generation to shake, "Zhi Zhi " sound should be the sound that lid of a powerful person shakes. The clearance that the individual thinks influencing factor basically has a powerful person to build (gap is bigger abnormal knocking is more apparent) , car operating mode (urgent quicken urgent decelerate Shi Gengming to show a bit) , the angle of by-pass valve open and athletic speed. Adjust job of electromagnetism a powerful person is unusual, this case a powerful person appeared to build shake to move below the air current function with be in particular after the position that affected open of waste gate door then and traversal speed give out " Zhi Zhi " abnormal knocking. The mobile clearance of the turbine supercharger waste gate of this car is more largish than normal car also at the same time, though have similar abnormal knocking,so outfit of breakdown electromagnetism a powerful person arrives after normal traffic, but noise is done not have so apparent. integrated by-pass valve clearance reachs electromagnetism a powerful person to work to brought about engine unusually finally to appear after receiving accelerator urgently quickly greatly too apparent " Zhi Zhi " metallic noise.
Adjust in door of decompression of the waste gas in this case next the character of service that breakdown of electromagnetism a powerful person has not affected engine apparently, car acceleration can fail to feel apparent unusual, also did not sign up for the malfunction code of engine system. Cannot thinking of waste gas decompression in the begining so the likelihood that breakdown of a powerful person of door adjustment electromagnetism can bring about turbine supercharger occurrence abnormal knocking, because this is discharging cause course took roundabout way.
If,still having is only the mobile gap by waste gate door is bigger and change breakdown of turbine supercharger assembly can not eradicate certainly. Be in so encounter similar course microscope to still be not checked when giving apparent breakdown to nod, think more, try more, probably trouble spot is in corner.
