Taking you to the next level apply & Innovate 2012 , IPG - PowerPoint PPT Presentation

Taking you to the next level „ apply & Innovate 2012“ , IPG Technology Conference, Karlsruhe, 21 and 22 June 2012 iTPMS-in-the-Loop Solution for Comprehensive Validation Tasks for indirect Tire Pressure Monitoring Systems According to the New ECE-R 64 Regulation Oliver Blanco-Hague, Coralie Dandre, MICHELIN Manufacture Française des Pneumatiques Charles Miquet, Bernhard Schick, IPG Automotive GmbH IPG Automotive GmbH 19.09.2012 1

Agenda TPMS-in-the-Loop Solution  Introduction  Direct and indirect TPMS systems  TPMS Test procedure according to ECE R-64  Requirements for indirect TPMS HIL application  iTPMS-in-the-Loop solution for comprehensive Validation Tasks  Conclusion IPG Automotive GmbH 19.09.2012 2

Introduction TPMS Will Be Mandatory by ECE-R 64 from 11/2012 Initial Situation  Today ~ 15% of new vehicles are equipped with Tire Pressure Monitoring Systems (TMPS)  TPMS will be mandatory by the new regulation ECE-R 64 from 11/2012 for vehicle in categories M 1 (<3.5 T) and N 1 equipped with single tyres  Direct and indirect TPMS are existing and could be used  OEMs are motivated to push to the indirect TPMS systems in order to saving money IPG Automotive GmbH 19.09.2012 3

Introduction TPMS Will Be Mandatory by ECE-R 64 from 11/2012 Challenges  Indirect TPMS are cheaper but lead to extreme testing effort  Huge numbers of vehicle variants, loads, driving conditions, road conditions, tire variants etc. must be approved to guarantee a robust system  Sophisticated simulation tools for virtual test drive can support to reduce time and money within the whole validation process.  A powerful simulation platform, a comprehensive test concept as well as reliable models – especially a reliable tire model – are needed IPG Automotive GmbH 19.09.2012 4

Direct and Indirect TPMS Systems Direct TPMS Systems Technology  Tire pressure sensor mounted either on the inside of the rim or on the end of the valve stem inside the tire or outside.  Information transmitted wirelessly to the receiver Source : VDO Source : Dunn Tire module using radio frequency communication Characteristics  Higher costs  Absolute pressure values, sometimes also the tire temperature  Battery of the sensor has to be changed for such systems Source : Continental IPG Automotive GmbH 19.09.2012 5

Direct and Indirect TPMS Systems Indirect TPMS System Wheel speed sensor (*4) Technology  Indirect TPMS are embedded as ESC function  TPMS function uses the wheel speed sensor signals to detect a possible under-inflated tire ESP ESP ABS ASR VDC VAFs Characteristics TPMS  Cheaper  No absolute pressure values, only relative  have to be reset by the driver once the tires are checked and all pressures adjusted correctly  sensitive to the influences of different tires and external influences like road surfaces and driving speed or style IPG Automotive GmbH 19.09.2012 6

Direct and Indirect TPMS Systems Detection Methods of the Indirect TPMS Wheel speed Un-inflated tire detection by wheel circumference comparison sensor (*4) Different tire pressure ESP Lead to different roll radius Circumference Effect  Pressure loss only in one tire detectable  Position of un- inflated tire couldn’t be exactly detected Source : Michelin  Tire slip influences the detection quality Which lead to different wheel speeds IPG Automotive GmbH 19.09.2012 7

Direct and Indirect TPMS Systems Detection Methods of the Indirect TPMS Un-inflated tire detection using spectrum analysis Different tire pressure Tyre mode shapes Source : Michelin Frequency Effect  Eigen-frequency is tire individual 35-50Hz Eigen-frequency oscillation due to Inflation pressure variation  Shift of eigen-frequency could be detected A  Position of inflated tire could be detected P  Pressure loss of more tire are detectable Frequency f IPG Automotive GmbH 19.09.2012 8

Regulation ECE 64 TPMS Test Procedure According to ECE R-64 Ambient and road condition  Ambient temperature between 0 C and 40 C  Road test surface with good grip and dry during the test Vehicle conditions  Usual load condition  Vehicle speed • Speed range from 40 km/h and 120 km/h for puncture test • Speed range from 40 km/h and 100 km/h for the diffusion test and the malfunction test  The whole speed range shall be covered during the test. IPG Automotive GmbH 19.09.2012 9

Regulation ECE 64 TPMS Test Procedure According ECE R-64 Warm-up Procedure and learning phase  Drive the vehicle for a minimum of 20 minutes within the speed range and with an average speed of 80 km/h (+/-10 km/h)  At the discretion of the Technical Service, where the driving test is undertaken on a track (circle/oval) with only turns in a single direction, then the driving test should be equally split (+/-2 minutes) in both directions  Within the 5 minutes of completing the learning phase, measure the warm pressure of the tyre(s) to be deflated. The warm pressure shall be taken as the value P warm . This value will be used for subsequent operations. IPG Automotive GmbH 19.09.2012 10

Regulation ECE 64 TPMS Test Procedure According ECE R-64 Puncture test  Deflation phase • Deflate one of the vehicle's tyres within 5 min until P warm -20% (P test ) or min. of 150 kPa • Stabilization period 2-5 minutes  Low tyre pressure detection phase • TPMS shall illuminate the warning signal < 10 minutes after reducing the pressure Diffusion test  Deflation phase • Deflate all four tyres within 5 minutes until P warm - 20% - 7 kPa (P test ) • Stabilization period 2-5 minutes  Low tyre pressure detection phase • TPMS shall illuminate the warning signal < 60 minutes after reducing the pressure IPG Automotive GmbH 19.09.2012 11

Regulation ECE 64 TPMS Test Procedure According ECE R-64 Malfunction test  Test procedure • Simulate a TPMS malfunction, for example, by disconnecting the power source to any TPMS component, or disconnecting any electrical connection between TPMS components, or installing a tyre or wheel on the vehicle that is incompatible with the TPMS. • Drive the vehicle for up to 10 minutes  Failure detection • TPMS shall Illuminate the warning signal < 10 minutes after generating the failure IPG Automotive GmbH 19.09.2012 12

Requirements for Indirect TPMS HIL Application Context : a Huge Variety of Configurations A huge validation effort is needed due to the large number of variants  Roads  Tire / wheel combination • Uneven  Load conditions • Even  Vehicle variants • Cross-country winding roads  Chassis variants • Autobahn  Speed  …  Ambient conditions (temperature) IPG Automotive GmbH 19.09.2012 13

Requirements for Indirect TPMS HIL Application Requirements : a Powerful HIL Simulation Platform Software & Model Environment HIL Tool Environment HIL Testbench for ESP  Vehicle  FailSafeTester tool  Simulation of all I/O signals  Driver and maneuver  Diagnostic tool support  CAN Communication  Road  CCP/XCP and flash tool  Hydraulic signal acquisition  Analysis tools  CAN/FlexRay/LIN tools  Accurate wheel speed sensor  Test automation  HIL instruments module  …  … IPG Automotive GmbH 19.09.2012 14

Requirements for Indirect TPMS HIL Application Requirements : a Reliable Tire Model A reliable tire model is required  High accurate physical tire model with realistic behavior.  Temperature signal of inflation medium  Tire Pressure modeling • Physical pressure effect • Tire pressure, which is function of tire temperature A • as input quantity of the tire model (not only parameter) P  Tire eigen-frequency modelling, which is pressure dependent Frequency f Wheel speed [rpm] Time IPG Automotive GmbH 19.09.2012 15

iTPMS-in-the-Loop TameTire for iTPMS-in-the-Loop TameTire model structure TameTire Data Base IPG Automotive GmbH 19.09.2012 16

iTPMS-in-the-Loop Wheel Speed Sensor Signal Monitoring Wheel Speed sensor signal Wheel speed Pulse IPG M400 IPG Automotive GmbH 19.09.2012 17

iTPMS-in-the-Loop iTPMS-in-the-Loop Solution Software modules Hardware component User GUI IPG M400 Thermo-mechanical tire model  Temperature effect  Pressure effect TameTire Data Base Tire eigen-frequency module Wheel Speed signal I (A) A P t Pulse Shift Frequency f IPG Automotive GmbH 19.09.2012 18

Conclusion iTPMS-in-the-Loop : the Solution for Indirect TPMS Validation  TPMS system are mandatory for passenger cars from 11/2012 according to the ECE R-64  Indirect TPMS are cheaper but lead to extreme testing and validation effort  A powerful simulation platform, a comprehensive test concept as well as reliable models – especially a reliable tire model – are needed  iTPMS-in-the-Loop module fulfills this sophisticated validation task for indirect TPMS IPG Automotive GmbH 19.09.2012 19