RELEASE DATE：2022-11-07 15:29
Abstract: UN R79.04 introduces new feature: RMF “Risk Mitigation Function”, meaning an emergency function which can, in the event the driver becomes unresponsive, automatically activate the vehicle steering system for a limited duration to steer the vehicle with the purpose of bringing the vehicle to a safe stop within a target stop area (e.g. emergency lane, hard shoulder, beside the road, slowest lane of traffic, own lane of travel). The RMF function can be divided into two categories. One is RMF with the purpose of bringing the vehicle to a safe stop inside its own lane of travel. The other is the RMF with the purpose of bringing the vehicle to a safe stop outside its own lane of travel. If the vehicle is equipped with RMF function, it should meet the corresponding requirements in UN R79.04.
TECHNICAL REQUIREMENTS
1. Any RMF shall start an intervention only:
- If the driver is either directly (e.g. through a driver monitoring system) or indirectly (e.g. prolonged failed response to a warning, failure to control the vehicle) assessed to be unresponsive; or
- If it is manually activated.
If the system provides a means for manual activation, this means shall be protected against unintentional operation and accessible to the driver and to passengers adjacent to the driver.
2. There shall be an optical and additionally an acoustic and/or haptic (e.g. brake jerks) warning signal before every RMF intervention in order to stimulate the driver to take back control. This warning phase shall start at least 5 seconds before the RMF starts an intervention.
3. The signal to activate the hazard warning lights shall be generated with the start of the intervention.
4. It shall be possible to override the RMF intervention of the function at any time by a distinct action of the driver.The RMF shall implement strategies to provide protection against unintentional override by inputs to the driving controls.
5. During the RMF intervention the vehicle shall slow down with a deceleration demand not greater than 4m/s2.
6. Once the RMF has brought the vehicle to a safe stop in the target stop area, the vehicle shall not move away without manual input.
7. During the lane change manoeuvre, the RMF shall aim to avoid a lateral acceleration of more than 1 m/s2.
8. The lane change manoeuvre shall aim to be one continuous movement.
9. A lane change manoeuvre shall only be started if the manoeuvre is anticipated to be completed before the vehicle comes to a standstill (i.e. in order to avoid coming to standstill while in the middle of two regular lanes due to stopped traffic ahead).
10. A lane change manoeuvre during an intervention shall be indicated in advance to other road users by activating the appropriate direction indicator lamps instead of the hazard warning lights.
11. Once the lane change manoeuvre is completed the direction indicator lamps shall be deactivated in a timely manner, and the hazard warning lights shall become active again.
12. The system shall implement strategies to draw external attention to the emergency situation (e.g. triggering an emergency call, activating the horn, keeping the hazard warning lights active), when the driver remains unresponsive once RMF has brought the vehicle to standstill.
An RMF system shall be subject to the requirements of Annex 6.
TEST PROCEDURE
1. Tests for an RMF, with the purpose of bringing the vehicle to a safe stop inside its own lane of travel:
- The vehicle shall be driven in a way that an intervention is initiated. The test requirements are fulfilled if:
- The ongoing intervention is indicated to the driver by an optical warning signal and additionally an acoustic and/or haptic warning signal.
- The signal to activate the hazard warning lights is generated with the start of the intervention.
- The deceleration demand does not exceed 4m/s2.
- Once RMF has brought the vehicle to a safe stop, the vehicle does not move away without manual input.
2. Tests for an RMF, with the purpose of bringing the vehicle to a safe stop outside its own lane of travel:
2.1. Scenario A:
A lane change manoeuvre is possible.
The vehicle shall be driven in a way that an RMF intervention is initiated while a target stop area outside the current lane of travel is available. In case there is another vehicle in the target lane this shall be positioned in a way not preventing a lane change of the RMF vehicle to the target lane.
- The test requirements are fulfilled if:
- The ongoing intervention is indicated to the driver by at least an optical and acoustic and/or haptic warning signal.
- The signal to activate the hazard warning lights is generated with the start of the intervention.
- The lane change manoeuvre is indicated in advance to other road users.
- The RMF vehicle changes the lane(s).
2.2. Scenario B:
A lane change manoeuvre is not possible.
The vehicle shall be driven in a way that an RMF intervention is initiated while a target stop area outside the current lane of travel is available. At the start of the RMF intervention there shall be another vehicle in the target lane positioned in a way preventing a lane change manoeuvre of the RMF vehicle to the target lane.
- The test requirements are fulfilled if:
- The ongoing intervention is indicated to the driver by at least an optical and acoustic and/or haptic warning signal.
- The signal to activate the hazard warning lights is generated with the start of the intervention.
- The lane change manoeuvre is indicated in advance to other road users.
- The RMF vehicle does not start a lane change manoeuvre as long as the vehicle in the target lane is still positioned in a way preventing a lane change manoeuvre.
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Bruce Chen
Vehicle Homologation Project Engineer
Bruce holds a Master's degree from Nanjing University of Technology, in ATIC, he is the professional driver & racer and type approval testing engineer
Phone: +86 15261862012
Email: bruce.chen@atic-cn.com