Before respecting aftertreatment breakdown, those who solve is pump of diesel engine urea, nozzle, and SCR box is an important part likewise, its action is the place that mix the azotic oxide in urea fluid and tail gas adequately and produces chemical reaction, block catalysis of SCR of SCR case volume again at present implement with engine exhaust muffler and an organic whole.
Integral material is stainless steel, SCR catalysis is installed inside implement fuse and noise elimination pipeline, surface layer stainless steel board bottom contains heat insulating materials, the surface in moving process is average temperature 200, 250 ℃ . Flange face interface is the entrance, another light is in charge of interface to be exit. Catalysis implement wait of temperature sensor, azotic oxygen sensor (discern when installation catalysis implement position of sensor of temperature of imports and exports) .
Typical breakdown one: SCR box air inlet duct and casing joint craze
Breakdown reason:
1, vent-pipe is too long and without flexible written guarantee and secure prop up, bring about SCR box to suffer force to cross big craze into gas mouth;
2, SCR box itself solders problem of the quality that make.
Handle measure:
1, solder afresh repair or change SCR box, increase proper vent-pipe support to vent-pipe road, reduce bracket to transfer vibration brings about SCR box craze
Typical breakdown 2: SCR box is put in abnormal knocking
Breakdown reason:
1, SCR box interior is crystal, crystallization matter drops interiorly rolls bump.
2, SCR box interior opens solder, abnormal knocking sound and crystallization are different, have the voice of iron forge iron.
3, carrier falls off disintegrate, this breakdown mode is sent less, accompany azotic oxygen to exceed breakdown code.
Handle measure:
Ravel SCR box is examined attribute crystallization problem, cleared and crystal, usable and clean hot water undertakes meticulous till clean,clean end till, the proposal that opens solder and carrier to fall off changes assembly.
Typical breakdown 3: SCR box crystallization jams exhaust back pressure is Wen Gao of tall, platoon, oily tall, motivation is not worth bad news
Breakdown reason
1, nozzle invalidation, eject amount is large, urea uses up freeboard to bring about crystallization serious;
2, oil is tasted reach empty filter is undesirable bring about arrange foreign matter much, urea of foreign matter adsorption, accumulate for long cause crystallization;
3, urea is undesirable bring about nozzle to block gush of usually of sluggish make water, occurrence crystallization.
Handle measure
1, whether is examination urea eligible urea, whether be urea impurity wears away to what nozzle causes reach jam, cause body of a powerful person to close lax or do not close on, clean or change nozzle, clean or change SCR box.
2, examination oil is tasted reach empty filter is eligible, add note eligible oil to taste, change empty filter.
Typical breakdown 4: SCR box is sundry jam
Remarks: Idle of place of this problem car fast, after SCR jams, end base does not have air current to pour out of originally; With idle of new car place fast end provides throughput difference very apparent.
Breakdown reason:
1, oil tastes undesirable existence impurity;
2, empty filter undesirable or maintain bring about the impurity that take energy of life not as good as overmuch
Handle measure:
Check empty filter whether too dirty, change empty filter, add note eligible oil to taste, clear wash manages or change SCR box.
Typical breakdown 5: SCR box exhaust carries amortization cotton emergence
Breakdown reason:
1, hind amortization board solders quality blemish, solder not firm bring about solder.
Handle measure:
Change afresh amortization board undertakes firm solder or change SCR assembly
Sum up: Breakdown of SCR case typical case and eliminate a method with respect to respecting here, car advocate if car is in guarantee coordinate service station inside deadline to change as far as possible assembly, super- guarantee the word of deadline, everybody is OK him rehabilitate can.
