Validation of Easy Move function with IPG CarMaker/HIL test bench - - PowerPoint PPT Presentation

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Validation of Easy Move function with IPG CarMaker/HIL test bench - - PowerPoint PPT Presentation

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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

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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

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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

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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

LR

CALIPER

RR CALIPER ESP SYSTEM

VEHICLE G

R O U N D

EPB SYSTEM LF

CALIPER

RF CALIPER

YAW RATE

SENSOR

G

R O U N D

PB

COMMAND

WHEEL WHEEL WHEEL WHEEL

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Description of Easy Move function

  • 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

The Easy Move function is distributed between ESP and EPB :

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Validation of the Easy Move function with IPG CarMaker/HIL test bench – IPG Technology Conference – 2010 5

ESP EPB Longitudinal acceleration sensor Parking brake command

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Easy Move functionalities

Automatic Parking Brake Management Assisted Parking Brake Management Hill Assist Function Dynamic Braking

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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.

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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.

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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).

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Easy Move functionalities

Dynamic Braking :

  • To decelerate the vehicle by a continuous press on the PB command

and to keep the vehicle stability.

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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

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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

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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

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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

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Example of Hill Assist activation

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Detection of Hill Assist situation The driver releases the brake pedal The driver presses the accelerator pedal The system keeps the 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 vehicle movement Vehicle movement

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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)

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Example of EPB activation

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The driver stops the vehicule in the downward slope EPB release The ESP pilots the EPB release The driver presses the accelerator pedal The EPB keeps the vehicle at standstill The driver releases the brake pedal EPB tightening The ESP pilots the EPB tightening The driver activates the EPB button

Example of EPB activation

Vehicle speed Gas pedal Brake pressure EPB effort Vehicle movement No vehicle movement

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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

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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

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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.

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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% 114 1137 1251 Easy Move tests %auto Manual tests Automatic tests TOTAL

Actual state of Easy Move tests :

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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 adapt automatically the test bench configuration

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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 :

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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.

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Thank you for your attention.