Integrated Vehicle Tire Pressure Monitoring Vehicle tire pressure monitoring system System functions System configuration Instructions for installation and diagnostics 1st. edition 815 000 452 3 8150004523 Revisions of this document are not set up. New versions could be found in INFORM website www.wabco-auto.com Ó Copyright WABCO 2004 Vehicle Control Systems An American Standard Company 8150003993 Changes are reserved Version 001/04.
FCC Notice This device consists of Wheelmodul 960 730 XXX X (SA4-WM730) and Electronic Control Unit 446 220 XXX X (SA4-ECU220) This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause undesired operation.
Contents 1. System functions 1.1 System structure 1.1.1 Example of installation in the bus 1.1.2 Example of installation in the trailer 5 7 8 8 2. Configuration 2.1 Components 2.1.1 Wheel module 2.1.2 Electronic control unit (ECU) 2.1.3 Display 2.2 Wiring 9 10 10 12 13 14 3. Installation instructions 3.1 General instructions 3.2 Overview 3.3 Additional mounting into vehicle/bus 3.3.1 Additional mounting into trailer 3.4 Inflation pressure 3.5 Installation of the control unit in vehicle 3.5.
System functions 1. 1. IVTM System functions IVTMstands for Integrated Vehicle Tire Pressure Monitoring. It is the tire pressure monitoring system, which is installed in the vehicle. IVTM continuously monitors the pressure in all tires. This monitoring is performed by the pressure sensors in all tires, which relays information to the display in the cabin and warns driver about critical pressure drop.
1. IVTM System functions Checks of the car fleets show: Every second tire is under-inflated by more than 10 %. Using of new IVTM system increases profitability : • reduced fuel consumption due to lower rolling resistance • smaller tire wear owing to lower deformation losses => longer tire life cycle • Saving costs of manual tire pressure check (up to 30 minutes for one vehicle) • spare tire is not needed due to low probability of rupture => higher vehicle load.
System functions This requires using sophisticated evaluation algorithm, instead of using simple identification of limit value. exact wheel identification for vehicles with more than 10 wheels or with double wheels • high efficiency of wireless data transport • pressure range 2 - 14 bars 1.1 System architecture 1. • Identification of tire pressure fluctuation based on load and tire wear. This function requires complicated "evaluative algorithm".
1. IVTM System functions 1.1.1 Example of installation in the bus: wheel module Driver display electronic control unit (ECU) 1.1.
Configuration 2. 2. IVTM Configuration In order to display tire pressure and trailer warnings to driver during driving it is in general case necessary to install IVTM to both parts of vehicle, i.e. one control unit to trailer and one unit to motor vehicle. Any vehicle equipped with IVTM could be connected to any trailer equipped with IVTM. Control unit of vehicle identifies control unit of trailer automatically: Synchronization is ensured through the break lights wiring, data are transported wirelessly.
2. IVTM Configuration Possible vehicle configuration: Motor vehicle 4x2 4x2 Super-Single 6x2 with Steering-/ Loading axle 6x2 with Steering-/lifting axle Super-Single 6x2/6x4 6x2/6x4 Super-Single 8x4 Trailer vehicles 1-axle trailer vehicle 2.1 2-axles trailer vehicle 3-axles trailer vehicle Parts 2.1.
Configuration IVTM 2. Special identification code of each wheel allows unique assignment of modules to particular wheels. Possibility of receptions of signals from another vehicle is excluded. Wheel module mounting on front and lifting axle Installation instructions: For wheels 22.5 x 7.5, 22.5 x 8.25, 22.
2. IVTM Configuration Wheel module installation on axle of trailer with single tires and Super-Single 2.1.2 Electronic control unit (ECU) For trailer wheels 22.5 x 11.75 ET 0 and 120; SuperSingle wheels 22.5 x 11.75, 22.5 x 15, 22.5 x 17, 10 holes pitch circle diameter 335 mm Three different types of electronic control unit (ECU) are used: ET 0 1. Motor vehicle (truck) 446 220 000 0 2. Attached vehicle (trailer) 446 220 001 0 3.
Configuration 2. IVTM The system may be extended up to 12 wheel modules for one control unit. All necessary information of IVTM system is shown on display. Connected to particular control unit by CAN bus. Performance of the system may be checked by internal diagnostics memory. These data are among others shown on the display: – All tire pressures could be displayed by pressing the button (Manometer). Manual tire pressure checks are not necessary. 2.1.
2. 2.
Configuration Trailer: Cable set 449 674 051 0 1 IVTM 2.
2.
Installation instructions 3. 3.1 3. IVTM Installation instructions General instructions These installation instructions are for experts, who have knowledge about installation of electronic and electropneumatic equipment in vehicles. It describes on examples mounting of IVTM equipment in motor vehicle and trailer. Respect general and special laws and regulations. Further respect drawings in appendix and particular technical parameters.
Installation instructions 3. Mounting and connection of cable harness to the control unit. 4. Finally: IVTM system configuration with PC diagnostics. light IVTM +24V GND brake Bremslicht 3. diagnostic Diagnosesocket steckdose 3.3 Additional mounting in motor vehicle/ bus Wheel modules are installed first. Elektronik control unit (ECU) (ECU) For the front wheels always one module with connecting hose and counter weight is necessary.
Installation instructions Connect hoses to modules and mount modules on prepared location (removed nuts). Then mount back wheel nuts. Connect hoses to valves. 3.4 3. IVTM Inflation pressure Actual tire pressures and pressures stored in diagnostics should correspond with values given by vehicle or tire manufacturer. Inflation pressure in tires should ideally be set up in ambient drive temperature, i.e. strictly before drive on ”cold” tires.
3. 3.5 IVTM Installation instructions Installation of electronic control unit to motor vehicle The control unit should be installed on such place, which is in same distance from all wheels. It is usually installed in the centre of vehicle. For trailer the control unit should be installed ahead of front axle. Install electronic control unit in such position, that longitudinal axis of unit is parallel with longitudinal axis of vehicle. Apart from that only installation ”terminals up” is allowed.
Installation instructions 3. IVTM Display Chassis Driver cabin DiagnosticsPlug WABCO Diagnostics Interface 446 301 021 0 Diagnostics Wire 446 300 348 0 connection for PC: COM Connection to IVTM-ECU red: +24 grey: ignition (with fuse 5A!) blue: ground yellow: brake light Break lights wiring should be connected only in case of vehicles with trailers, i.e. for example not for buses. Connection provides synchronisation of signals from trailer to motor vehicle.
3. IVTM Installation instructions If possible install IVTM diagnostics plug close to other diagnostics terminals of vehicle. 3.5.2 Cable harness installation Trailer For installation of electronic units into motor vehicle use prepared cable harnesses WABCO. IVTM parts are connected by installed plug-in modules. Adjust location of cables to individual vehicle situation. Respect relevant law regulations. Wiring + 24V must be fused 5A.
Installation instructions IVTM 3. Examples of Vario C wiring: **) + 24 Volt Masse Vario C wiring without additional electronics For connection in Vario C housing are needed auxiliary thread connections : brake light **) + 24 Volt Vario C wiring with auxiliary electronics ECAS Masse brake light with power module 446 107 530 0 **) Remark: For installation of connecting cable IVTM in trailer WABCO is recommending cable socket AK 192 from: Apparatebau Kirchheim-Teck GmbH & Co.
24 960 730 820 4 960 730 056 4 960 730 054 4 960 730 058 4 960 730 052 4 960 730 053 4 960 730 055 4 L-shape hose External hose for rear axle Internal hose for rear axle Single tire hose ET 120 trailer hose ET 0 trailer hose external hose for bus rear axle Super Single for bus 884 014 985 0 960 730 007 0 wheel module L-Shape (front axle) Counter weight 884 623 605 0 960 730 001 0 wheel module Standard 449 674 051 0 Trailer cable 884 650 161 0 446 221 000 0 Display 894 607 295 0 884 906 940 0
Installation instructions IVTM 3. Review of connecting hoses: Super Single 22.5 x 17 960 730 052 4 Trailer 22.5 x 11.75 ET 120 960 730 053 4 Double tires – external 22.5 x 7.5 ET 160 22.5 x 8.25 ET 160 22.5 x 9 ET 160 Trailer Double tires – internal 22.5 x 11.75 ET 0 22.5 x 7.5 ET 160 Super Single 22.5 x 11.75 22.5 x 15 960 730 054 4 960 730 055 4 Independent L-shape wheel 22.5 x 7.5 with protecting ring 22.5 x 8.25 ET 160 22.5 x 9 960 730 056 4 Independent wheel with axle cap 22.5 x 7.
4. IVTM 4. Diagnostics 4.1 System configuration Diagnostics Newly installed IVTM system is configured, i.e. set up, by PC diagnostics of IVTM system. Parts necessary for configuration: Diagnostics connecting cable: 446 300 348 0 Diagnostics interface with cable: 446 301 021 0 Diagnostics software: 446 301 730 0 Remark: Diagnostic could be done only with special diagnostics cable for IVTM, other diagnostics cables WABCO (i.e. cables for EBS, ECAS etc.) could not be used. 4.
Diagnostics 4.3 OPERATING INSTRUCTIONS IVTM 4. If the tire pressures are not exceeding specified values, following data are displayed after initialisation: The system consists of one electronic unit, so called electronic control unit, which receives wireless information from wheel modules. Wheel modules are permanently connected by hoses to tire valves. Pressure information is processed by algorithms stored in control unit. Data are relayed by CAN bus to display.
4. IVTM Diagnostics Example: If the three axles trailer is connected to shown vehicle, Fig. 3 is changed to: 4.4.2 Pressure display This manometer function shows the tire pressures measured by IVTM system, and completely replaces manual pressure measurement through tire valves. The values are displayed after pressing left button ”manometer” in normal mode. IVTM The axle, whose pressures are displayed, is marked. Fig. 4 The display shows IVTM logo (Fig.
Diagnostics If the button ”manometer” is not pressed for 20 seconds, the display also switches to normal display mode. 4. IVTM 4.4.3.2 Extremely high pressure 4.4.3 Error messages All defects found by system could be displayed in order of their importance. bar IVTM This function could be activated by pressing button ”question mark - ?”. Symbol of defect wheel blinks in particular vehicle image (both tires in case of double tires), symbol of detected defect and particular indicator are lighted.
4. IVTM Diagnostics Action: Drive should slow down the vehicle and on first occasion adjust the tire pressure. If the image of vehicle is displayed and you press the button ”pump” for 5 seconds, the control unit of this vehicle is reset. 4.4.3.5 High pressure Switching off of the display confirms successful reset. If the unit is not reset, the display changes to normal operating mode.
Diagnostics 4.5.2 System error IVTM 4. 4.5.3 Interrupted connection between control unit and display If the connection between IVTM and display is interrupted, following information is shown and white line on IVTM logo is flashing. IVTM Fig. 17 IVTM This error message is displayed when IVTM functions or regular tire pressure monitoring fails. All wheels are blinking on display. IVTM logo is crossed. In certain cases the type of vehicle equipped with IVTM is not recognized.
