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

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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

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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

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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

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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.

Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 38

Thank you for your attention.