Post on 14-Apr-2018
Validation of Easy Move function
with IPG CarMaker/HIL test bench
IPG Technology Conference 2010
Author : Olivier COLLIN – ALTENVerified by : Philippe LACLEF – PSA Ref : 01554_10_04114
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 2
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 3
Description of Easy Move function
Easy Move System
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.
Easy move system
LRCALIPER
RRCALIPER
ESP SYSTEM
VEHICLE
GR
O
U
N
D
EPB SYSTEM
LFCALIPER
RFCALIPER
YAW RATE
SENSOR
GR
O
U
N
D
PBCOMMAND
WHEEL
WHEEL
WHEEL
WHEEL
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 4
Description of Easy Move function
- ESP is the master ECU of the system :
It requires the EPB tightening and release
It can apply hydraulic pressureIt 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
The Easy Move function is distributed between ESP and EPB :
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 5
ESP
EPB
Longitudinal acceleration sensor
Parking brakecommand
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 6
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 7
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 8
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 9
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 10
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 11
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 12
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 13
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 14
Initial IPG HIL test bench provided for ESP validatio n
Adaptation for EPB :
- Development of a support to hold the EPB with itscables 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 15
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 16
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 17
Example of Hill Assist activation
Simulation of a Hill Assist situation on IPG HIL tes t 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 18
Example of Hill Assist activation
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 19
Detection of Hill Assist situation
The driver releases the brake pedal
The driver presses the accelerator pedal
The system keepsthe pressure applied
Electro Valves activation
Vehicle speed
Example of Hill Assist activation
Brake pressure
The driver stops the vehicle
The system stops the Hill Assist activation
Gas pedal
No vehiclemovement
Vehiclemovement
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 20
Example of EPB activation
Simulation of a situation with EPB use on IPG HIL te st 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’swill 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 21
Example of EPB activation
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 22
The driver stops the vehiculein the downward slope
EPB release
The ESP pilots the EPB release
The driver presses the accelerator pedal
The EPB keeps the vehicle at standstillThe driver releases the brake pedal
EPB tighteningThe ESP pilots the EPB tightening
The driver activatesthe EPB button
Example of EPB activation
Vehicle speed
Gas pedal
Brake pressure
EPB effort
Vehiclemovement
No vehiclemovement
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 23
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 24
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 25
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 26
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 27
Validation of Easy Move function
It takes 40h to 95h to launch all the automatic tests, according to the projects :� several nights are necessary
90,9%11411371251Easy Move tests
%autoManual
testsAutomatic
testsTOTAL
Actual state of Easy Move tests :
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 28
Automatic tests
Development of a specific tool to launch the Easy Move automatic tests :
� To help the users and to make the launch of tests easy and fast
� To allow the change of vehicule configuration (variant coding) and to adaptautomatically the test bench configuration
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 29
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 30
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 31
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 32
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 33
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 34
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 35
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 36
Tests results
Automatic tests are launched by night and results can be analysed the day after.
Example of automatic tests report :
Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 37
Conclusion
Easy Move : complex function that needs a lot of tests to be validated.
With automatic validation on IPG HIL test bench : each software received can be checked systematically, to fulfil the request of the projects.
Next step is the integration of motorized calipers with the Easy Move function : an adaptation of IPG HIL test bench has been already made, the update of the automatic tests will follow.