Validation of Easy Move function with IPG CarMaker/HIL test bench IPG Technology Conference 2010 Author : Olivier COLLIN – ALTEN Verified by : Philippe LACLEF – PSA Ref : 01554_10_04114
Validation of Easy Move function with IPG CarMaker/HIL test bench 1 – Description of Easy Move function 2 – Adaptation of IPG HIL test bench 3 – Validation of Easy Move function Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 2
Description of Easy Move function The Easy Move system is composed of : - an EPB (Electric Parking Brake) based on “cable puller” system . The EPB system uses the rear brake calipers to apply the braking effort. - an ESP system . The ESP system uses the braking system integrated on the vehicle to perform the Easy Move function. - a parking brake command for the driver. - a longitudinal acceleration sensor to estimate the slope. RF RR Easy Move System WHEEL WHEEL C ALIPER C ALIPER G G ESP SYSTEM R R O O EPB SYSTEM U U Y AW RATE N N SENSOR D D Easy move system LF LR WHEEL WHEEL CALIPER CALIPER PB V EHICLE COMMAND Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 3
Description of Easy Move function The Easy Move function is distributed between ESP and EPB : - ESP is the master ECU of the system : It requires the EPB tightening and release It can apply hydraulic pressure It checks there is no vehicle movement when the EPB is tightened - EPB is a smart actuator and works like a slave ECU : It supervises the parking brake command (button) It must take into account the ESP orders (tightening and release) It supervises the effort applied and can ajust it if necessary - ESP & EPB can also work in degraded mode in case of error detection Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 4
ESP Longitudinal acceleration sensor EPB Parking brake command Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 5
Easy Move functionalities Automatic Parking Brake Management Assisted Parking Brake Management Hill Assist Function Dynamic Braking Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 6
Easy Move functionalities Automatic Parking Brake Management : - To hold automatically the vehicle mechanically when the vehicle is parked. - To release automatically the vehicle upholding and to authorize only the vehicle movement in the direction of driver will. Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 7
Easy Move functionalities Assisted Parking Brake Management : - Assisted « Vehicle Hold Function » Management : To hold the vehicle on activation of the park brake command. - Assisted « Vehicle Release Function » Management : To liberate the vehicle on activation of the park brake command. Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 8
Easy Move functionalities Hill Assist Function : - To help the driver during a drive off on a hill by a vehicle upholding so that the vehicle doesn’t go in opposite side of driver will. The time of upholding is limited (2s max). Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 9
Easy Move functionalities Dynamic Braking : - To decelerate the vehicle by a continuous press on the PB command and to keep the vehicle stability . Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 10
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 11
Validation of Easy Move function with IPG CarMaker/HIL test bench 1 – Description of Easy Move function 2 – Adaptation of IPG HIL test bench 3 – Validation of Easy Move function Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 12
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 13
Initial IPG HIL test bench provided for ESP validation Adaptation for EPB : - Development of a support to hold the EPB with its cables and calipers, respecting the mounting geometry - Simulation of the EPB button (parking brake command) - Update of CAN informations (EPB inputs and outputs) - Update of the hydraulic model to take into account the EPB effort applied on the rear calipers Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 14
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 15
Test bench adaptation - The final IPG HIL test bench can be used in 3 configurations : ESP + EPB together ESP only (EPB simulated) : to test the ESP behaviour in case of EPB failure EPB only (ESP simulated) : to test the EPB behaviour in case of ESP failure Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 16
Example of Hill Assist activation Simulation of a Hill Assist situation on IPG HIL test bench : - The driver stops the vehicle on a hill - The driver releases the brake pedal and presses the accelerator pedal to go away - During this short time interval, the ESP keeps the pressure applied to hold the vehicle, and to avoid a movement in the opposite direction Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 17
Example of Hill Assist activation Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 18
Example of Hill Assist activation Detection of Hill Assist situation The system stops the Electro Valves activation Hill Assist activation The system keeps the pressure applied Brake pressure The driver releases the brake pedal Gas pedal The driver presses the accelerator pedal The driver stops the vehicle Vehicle speed Vehicle No vehicle movement movement Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 19
Example of EPB activation Simulation of a situation with EPB use on IPG HIL test bench : - The driver stops the vehicle on a hill and presses the EPB button to tighten the EPB (manual tightening) - The driver releases the brake pedal, the EPB keeps the vehicle at standstill - The driver presses the accelerator pedal to go away, the system detects the driver’s will and the ESP pilots the EPB release (automatic release) Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 20
Example of EPB activation Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 21
Example of EPB activation The driver activates The ESP pilots the the EPB button EPB release EPB tightening The ESP pilots the EPB tightening EPB release EPB effort The driver releases the brake pedal The EPB keeps the vehicle at standstill Brake pressure Gas pedal The driver presses the accelerator pedal Vehicle speed The driver stops the vehicule in the downward slope No vehicle Vehicle movement movement Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 22
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 23
Validation of Easy Move function with IPG CarMaker/HIL test bench 1 – Description of Easy Move function 2 – Adaptation of IPG HIL test bench 3 – Validation of Easy Move function Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 24
Validation of Easy Move function Objectives : - To verify the system (ESP + EPB) respects the logic specified by PSA � correct relationship between the inputs and the outputs of the system - To check the integration of the system � correct communication between ESP and EPB - Electronic validations only � mechanical performances validated on vehicle Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 25
Validation of Easy Move function Challenges : Currently 6 projects use the Easy Move function. (First project : Citroën C4 Picasso in 2006) All projects have specificities that must be taken into account, for example : - Parking brake command with 2 or 3 states - Coupling with stop & start function - Coupling with hybrid functionalities Constant evolution of the Easy Move logic, with new informations to validate. Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 26
Validation of Easy Move function Actual state of Easy Move tests : Automatic Manual TOTAL %auto tests tests Easy Move tests 1251 1137 114 90,9% It takes 40h to 95h to launch all the automatic tests, according to the projects : � several nights are necessary Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 27
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