Central Pneumatic 99792 User Manual download pdf

Introduction If we look at the different suspension systems used in motor vehicles

today, the most apparent difference between them is that they are either

mechanical or air suspension systems.

Both types are, of course, incapable of meeting all technical

requirements. If they are, however, directly compared, it soon becomes

apparent that air suspension offers major benefits compared with

mechanical suspension systems.

As a result air suspension systems are used to an increasing extent in

commercial vehicles.

Benefits of Air Suspension Systems 1. By changing the bellows pressure, depending on the load carried on

the vehicle, the distance between the road surface and the vehicle’s

superstructure addresses the same level. This means that the

boarding or loading height, and the headlight settings, remain

constant.

2. Spring comfort remains almost unchanged across the whole of the

loading range; again this is achieved by changing the bellows

pressure. The passenger on a motor coach will always perceive the

same pleasant type of oscillations. Sensitive loads can thus be

carried without being severely damaged. The well-known “jumping”

of an unladen or partially laden trailer no longer occurs if an air

suspension system is used.

3. The stability of the steering system and the transfer of the braking

forces are improved since all wheels always have good adhesion to

the road surface.

4. The pressure in the air bellows, depending on the load the vehicle

carries, is ideal for use in controlling automatic load-sensitive

braking.

5. In the area of control for interchangeable platforms, air suspension

systems are an excellent basis for cost-effective loading and

unloading of containers.

6. The kneeling effect often required for routine buses can easily be

achieved by venting the nearside air bellows.

Air Suspension Systems Basic Training

1 2 3 4 5 6 ... 18 19

Summary of Contents

Page 1

12Introduction If we look at the different suspension systems used in motor vehiclestoday, the most apparent difference between them is that they are

Page 2

10Lifting Axle Systems (examples)Basic Training152Lifting Axle Circuit electronically operated Pos.UnitsDescription Order number6 1 Pressure limiting

Page 3 - 464 002 ... 0

11Lift Axle Control Valves Basic Training152Setting InstructionAfter the valve has been installedaccording to the fixing instructionand the scheme, th

Page 4

12Picture 1: ECAS parts for vehiclesPicture 2: ECAS parts for trailersElectronically controlled air suspensionsystem (ECAS)Basic Training152

Page 5

13Electronically controlled air suspensionsystem (ECAS)Basic Training152ECAS stands forElectronicallyControlledAirSuspensionECAS is an electronically

Page 6 - Important

14Electronically controlled air suspension system (ECAS)Basic Training152Functional descriptionA height sensor (3) permanentlyevaluates the vehicle´s

Page 7 - Installation recommendation:

15Electronically controlled air suspensionsystem (ECAS)Basic Training152ECAS Electronic (ECU)446 055 . . 0The Electronic Control Unit (ECU)The Electro

Page 8 - (Raising/Lowering)

16Electronically controlled air suspensionsystem (ECAS)Basic Training152ECAS solenoid valve472 900 05 . 0Valve for axle with two height sensorsThe sol

Page 9 - Variants

17Electronically controlled air suspensionsystem (ECAS)Basic Training152This valve is similar to the valvedescribed above but it contains fewerparts.S

Page 10

18Electronically controlled air suspension system (ECAS)Basic Training152By means of the RCU the driver caninfluence the vehicle's level within t

Page 11 - Setting Instruction

19Electronically controlled air suspensionsystem (ECAS)Basic Training152The pressure sensor produces a voltageoutput which is proportional to thepress

Page 12 - Basic Training

2Air Suspension BellowsBasic Training15Purpose Depending on the levelling valve’s control, the air suspension bellowsare designed to take up the requi

Page 13

3Purpose Levelling valves, also called air suspension valves, are used to controlthe suspension in air-sprung vehicles. Their purpose is the sensitive

Page 14

4Levelling ValvesBasic Training15Operation of Levelling Valve 464 002a. Pressurizing Position If the vehicle is pressureless, its superstructure rests

Page 15

5d. When Unloading When the vehicle is unloaded, the levelling valve is controlled in reverseorder. Its superstructure rises, moving the guide (7), to

Page 16

6Adjustment of Levelling ValveBasic Training15After mounting the air levelling valve, the lever length isadjusted following the vehicle manufacturer’s

Page 17

7Rotary Slide Valves Basic Training152Purpose:Control of raising / lowering of airsuspended interchangeableplatforms and semitrailer chassis(lifting d

Page 18

8Air suspension systems (examples)Basic Training15Schematic for Testing and Installation for TrailersPos.UnitsDescription Order number5 1 Drain valve

Page 19

9Lift Axle Control Valves Basic Training152Purpose:The lifting axle compact valve is incharge of lowering or raising thelifting axle(s) manually oraut

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Central Pneumatic 99792 User Manual

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