DCC自适应底盘控制系统

1、dcc自适应底盘控制系统service trainingself-study manual 406dcc adaptive chassis control systemstructure and functioncomfort modecommon modemovement patterncomfort modecommon modemovement patternthe need to emphasize driving sense has always been emphasized by the suspension systemdynamic performance is achiev

2、ed.in this new system - dcc adaptive chassis control system,the suspension system is responsive to road conditions, driving conditions, and driver requirementsadjust yourself constantly.the adjustable shock absorber is a necessity for the above functions.s406_002the steering system also provides an

3、additional match for the shock absorber.the dcc adaptive chassis control system is the first to be used in the publicpassat cc.this manual will work on the principle of the dcc adaptive chassis control systemline detail explanation.the self taught manual describes the newly developed structures and

4、functions. for current inspection, commissioning and maintenance instructions,its contents will not be updated. please refer to the relevant maintenance information.new techniqueimportantpromptcatalogintroduction. fouroverview of shock absorber systems. . .4adjustable shock absorber. . 5.working pul

5、se spectrum of adjustable shock absorber. . 7.system specification. . 8.dcc adaptive chassis control system. . . . eightoverview of vehicle use components. . . tenthe system is connected to the brakes and the steering gear. . . elevensystem overview. . .12function. . . fourteenshock absorber for dcc

6、 adaptive chassis control system. . . . fourteenregulating valve. . . fifteenelectronic mechanism. . . .20control unit of electronically controlled damping system j250. . . .20vehicle height sensor g76, g78, g289. .21body acceleration sensors g341, g342, g343. . . .24function diagram. . .26maintenan

7、ce. . . . . . .28self test questions. . . . . . thirtyintroductionoverview of shock absorber systemsa shock absorber has a rapid weakening of body and wheel vibration energyeffect。suspension diagramthe alternation of the compression stroke and the stretching stroke is the suspension systembasic char

8、acteristics.generally, the damping force in the compression stroke is less than that in the stretching strokedamping force.the shock absorber can stop the body vibration due to the bumps of the road surfaceand prevent the tires from beating on the road.in addition, the force acting on the shock abso

9、rber in dynamic mode also makesbody stability.by fully investigating the current driving environment, we canwith an adjustable shock absorber, a better shock absorption effect is achieved. electronic control subtractiona control unit for shock damping can determine which wheel in millisecondswhat da

10、mping coefficients need to be adjusted and adjusted?adjust accordingly.the coefficient of damping is the rate at which vibration is damped.it consists of shock absorber, damping force and spring quality specificationdecisive.increasing the mass of a spring reduces the damping coefficient, which mean

11、s vibration reductionthe weak rate slows down.reducing the mass of spring can improve the damping coefficient.low damping coefficientspring travelhigh damping coefficientspring traveladjustable shock absorberbe applied todcc adaptive chassis control system with adjustable shock absorber piston in th

12、e oil chamber1 internal work.double pipe structure is adopted. in oil chamber2, there is an additional air cushion.a shock absorber icon in the extended strokedefoaming coilpiston valvepistonbottom valvefloorpiston rodduct / sealing ringoverflow pipering channelcylinderair cushionthe oil chamberonet

13、he oil chambertworegulating valveintroductionregulating valvein the compression stroke, the direction of the oil flow is adjusted by the following devices:regulating valve,piston, valve andbottom valve restriction mechanism.the function of stretching stroke and compressing strokein the drawing of th

14、e stretching and compression stroke, the piston and the bottom plate can be seenthe regulating valve causes the oil to flow in the specified direction.in the extended stroke and the compression stroke, the oil is supplied by an annular pipethe regulating valve flows in the same direction (one-way fl

15、ow). oil fromthe control valve flows back into the oil chamber2.the control valve controls the oil chamber2 pressure and damping force.stretching strokedefoaming coilring channeloil chamber 2bottom valveduring the stroke, the flow of oil is controlled by the following devices:regulating valve,bottom

16、 valve andpiston valve limit mechanism.the cylinder contains an oil chamber2.the oil tank is partly filled with oil, and there is a gas with defoaming coil on the oil inletgasket, oil chamber2 used to compensate for changes in the amount of oil.the oil flow consists of a shock absorber located on th

17、e piston, oil chamber, base and regulating valvevalve unit control. the damping valve unit is composed of a flat spring, a helical spring and a beltthe valve body of the oil passage.compression strokepiston valveworking pulse spectrum of adjustable shock absorbercompared with the traditional shock a

18、bsorber with fixed pulse spectrum, adjustable shock absorber with adjustable characteristic curve in the same pulse spectrum.traditional shock absorber adjustable shock absorberwork pulse spectrumdamping forceextended travel damping forcecharacteristic curve expansion strokepowerpowercompression str

19、okecompression strokein the "fail safe" mode, the control valve does not work, and the shock absorber will followwork with a default characteristic curve.s406_013the traditional shock absorbers have a characteristic curve to help define the carvehicle handling characteristics.the character

20、istic curve is defined by each vehicle following this suspension graphresults of rows. it depends on the front and rear weights of the vehicle and the engine,vehicle characteristics and vehicle bridge motion.s406_014the damping characteristic curve of the adjustable shock absorber can be changed by

21、the currentadjust the supply status of the control valve. a work pulse spectrum is thus generated.the above adjustments are available in all modes (general, movement, comfort)conduct。in accordance with the current driving conditions, the shock absorption rate can be specified according to the pulse

22、spectrumadjust, even if you have selected a driving mode.system descriptiondcc adaptive chassis control systemthe adjustable dampers are regulated by a control unit that regulates damping based on the control algorithms developed by volkswagen.depending on the input signal, the pulse spectrum of the

23、 adjustable shock absorber can be used. this control algorithm is also enabled by buttons"ordinary", "sports"","comfortable" between three modes of free switching, so as to achieve user needs.the system can be adjusted when the vehicle is stationary or moving.the d

24、cc adaptive chassis control system is always in working order. prompt：it is an intelligent automatic control system based on the following elementsadjust the vehicle damper:the last mode of use, after the ignition switch is closed, opens again,still valid.pavement condition,driving mode can be switc

25、hed on when the vehicle is stationary or moving.different driving conditions (braking, acceleration, cornering) andthe regulating valve does not work when the vehicle is stationary.driver requirements.as a result, the driver is always able to obtain an ideal shock absorber.driver requirementspavemen

26、t conditionj250 shock absorber adjustmentreal time calculation of driving conditions(arithmetic)s406_047optional dcc modethe dcc mode can be customized by the driver by adjusting the button on the right side of the selector lever. press and hold the button until you get the settings you wantpattern。

27、 this operation can be repeated. the system will always switch in the order of "ordinary" - "movement" - "comfort"."ordinary" modelwhen the buttons are "comfortable" and "moving", the two logos are not apparentwhen yellow is shown,dcc modea

28、dditional information, such as:-transmission control unit-engine control unit- abs/esp control unit-driver assistance systems, for example, acctransfer tocan data bus informationcan data bussystem descriptionsystem overviewsensorshock control button e387left front body acceleration sensor g341right

29、front body acceleration sensor g342rear body acceleration sensor g343left front vehicle height sensor g78right front vehicle height sensor g289rear rear vehicle height sensor g76additional information, such as. accelerator pedal positionsteering auxiliary control unit j500(pressure from the driver)s

30、teering angle sensorbrake pressuredata bus diagnostic interface j533actuatorshock absorber valve, left frontn336band indicator in combination instrumentcontrol list for indicating unitelementj285shock absorber valve, right frontn337electronically controlled damping systemcontrol unitj250shock absorb

31、er valve, left rearn338shock absorber valve, right rearn339s406_012functiondcc adaptive chassis controlled shock absorberdouble tube shock absorbers are applied todcc adaptive chassis control system.the electronic control valve is mounted on the outside of the shock absorber to adjust the damping fo

32、rce.by changing the electric current, the damping force set by the damper can be adjustedthe valve is adjusted in milliseconds.three height sensors of the vehicle and three acceleration sensors of the bodya signal is provided to calculate the required shock absorber settings. individual shock absorb

33、ersa control unit for setting the pulse spectrum stored in an electronically controlled damping systemj250in.the ammeter shown in the diagram helps to illustrate the current supplied to the regulating valvethe ammeter is in "ordinary" mode.in the "ordinary", "sports" an

34、d "comfort" modelsthe device does not adopt the fixed current control, but adopts onethe current value within a specified range (see in the ammeteryellow area).the following figures simply show the ammeter pointerpossible adjustments in the central position of the yellow regionvalve mode.a

35、n illustration of a shock absorber in its extended strokeadjustable shock absorberring channeloil chamber 2ammeterregulating valveregulating valvethe regulating valve is mounted on the damper side so that the oil flows from the damper ring passage to the regulating valve. the oil supplied by the reg

36、ulating valve is delivered to the shock absorberthe oil chamber2.the valve is regulated by supplying current to the coil (0.24a to maximum)2.0a) and thereby change the internal oil flow of the regulating valve.according to the position of the control valve of the regulating valve, the oil flowing ou

37、t of the shock absorber pushes the main piston to the corresponding horizontal position so that a certain amount of oil can be obtainedflow back into the shock absorber via the oil return passage. the position of the main piston is achieved by setting the hydraulic pressure difference between the in

38、ternal control volume (and from the shock absorber)the pressure of the oil in the engine is compared. the oil pressure difference is set by the cross section of the channel between the preload head and the control panel. if preloadhasten,a large amount of oil flows through the central hole of the ma

39、in piston, and then the oil is reduced through the annular passage and the control passage. internal control volumethe pressure is increased so that the main piston can only move slightly to the right. this kind of change makes damping behavior become "hard"". if the preload becomes s

40、maller, the system takeson the contrary, the operation tends to make the damping behavior soft".the greater the supply current,the damping behavior tends to be "hard"".electrical interfacecoilelectric rotorpush rodpressure headfail safe valvecontrol panelinternal control volumema

41、in pistonoil return passagelead to the shock absorberfrom shock absorberslead to the shock absorberpressure plateoil return passagecontrol channelring channelfunctionthe regulating valve in the "ordinary" modein the "ordinary" mode, the current supplied by the coil is in the curr

42、ent0.24a andthe middle area of 2.0a. the electric rotor moves with the push rod and the headthe head was slightly pre tightened.the oil that flows out of the shock absorber presses the main piston into the horizontal center so that medium oil can flow back into the shock absorber through the oil ret

43、urn passage.this is accomplished by setting a moderate preload between the press head and the control panel. the oil pressure difference is based on the internal control volume, the main pistonthe position is also located in the horizontal center.therefore, the damping behavior is between "soft

44、" and "hard".electrical interfacecoilelectric rotorpush rodpressure headcontrol panelinternal control volumemain pistonoil return passagelead to the shock absorberfrom shock absorberslead to the shock absorberpressure plateoil return passagecontrol valve in "hard" modein the

45、 "hard" mode, the current supplied to the coil is maximum2.0a. the electric rotor, together with the push rod and press head, is pushed to the left and produces the maximumpretension.thus, there is a small channel cross section between the control panel and the indenter in comparison with

46、the "normal" mode.as the internal control volume, hydraulic pressure difference increases, the main piston is in the horizontal position, so that the oil flow back to the shock absorber is lower than that of the shock absorber through the oil return passageoil return in "ordinary"

47、; mode.as a result, damping behavior tends to "hard" mode.this is the typical state of the valve when it is obviously operated dynamically.electrical interfacecontrol panelinternal control volumecoilmain pistonelectric rotorlead to the shock absorberpush rodfrom shock absorberslead to the

48、shock absorberpressure headoil return passagemain pistonlead to the shock absorbercontrol pistoninternal control volumecontrol panelelectrical interfacecoilelectric rotorpush rodfrom shock absorberslead to the shock absorberpressure headoil return passagecontrol channel ring channeleighteenfunctionr

49、egulating valve in soft modein the "soft" mode, for example, the current of the magnet is0.24a, the push rod and the head have a smaller preload. the press head is the same forcethe control piston is turned left so that the cross section of the annular channel is only slightly smaller. the

50、 oil passes through this passage and is then returned to the control channelshock absorber。the cross section of the channel between the control panel and the indenter increases with the reduction of the preload of the indenter. the pressure difference in the internal control volume decreases. placei

51、n order to,the main piston will be placed horizontally so that the flow of oil back through the oil return line is greater than the "hard" mode.in this way, damping behavior tends to be "soft".this is the typical state of the valve when it is obviously operated dynamically.control valve in "fail safe" modeif a shock absorber, at least there is2 sensors, or control units for electronically controlled damping syst