UN R79 Supplement 5 (03 series) · UNECE Regulation No. 79 (ECE R79) — Uniform provisions concerning the approval of vehicles with regard to steering equipment.
UN R79 — Supplement 5 to the 03 series of amendments
Supplement 4 → 5
- What changed
- Paragraph 5.6.4.1.2. adds an exception to the lane centring aim of ACSF of Category B1 when ACSF of Category C is in standby mode.
- Paragraph 5.6.4.2.3. adds an exception to automatic deactivation of ACSF of Category C at a transition to a road type where it is not permitted.
- At the request of the manufacturer and with the agreement of the Technical Service, Annex 8 tests may be conducted under deviating test conditions. The performance requirements are still to be met.
- Why
- The lane centring change aims to align with the principle agreed for Automated Lane Keeping Systems (ALKS).
- When changing from one highway to another, the ACSF of Category C should be permitted to remain in stand-by.
- Type approval testing should also be possible during the winter months, on wet surfaces or at lower temperatures.
Q1What changed7 changes
Lane centring when ACSF of Category C is in standby mode (para. 5.6.4.1.2.)
When the ACSF of Category C is in standby mode, the ACSF of Category B1 must aim to centre the vehicle in the lane. This does not apply when a different position in lane is deemed reasonable due to the situation or resulting from driver input. The vehicle manufacturer must demonstrate this to the Technical Service during type approval. Before this supplement, the text had no such exception and did not say who demonstrates it. The text now says “in standby mode” instead of “activated (standby)”.
Automatic deactivation at a road type transition (para. 5.6.4.2.3.)
When the road type changes to one where an ACSF of Category C is not permitted, the system must deactivate automatically (off mode). This does not apply when a missing second lane in driving direction is the only condition not fulfilled. An example is a connector between two highways. Before this supplement, the text had no exception to this automatic deactivation.
System status during overriding (para. 5.6.4.3.)
The system may remain active, provided that priority is given to the driver during the overriding period. Before this supplement, the text said that the system may remain “activated (standby mode)”.
Tests under deviating test conditions (Annex 8, para. 2.)
At the request of the manufacturer and with the agreement of the Technical Service, tests may be conducted under deviating test conditions. Examples are a not dry surface or an ambient temperature below the specified minimum. The performance requirements are still to be met. This option is new.
Direction indicator deactivation in item (j) (Annex 8, para. 3.5.1.2.)
Item (j) of Annex 8, paragraph 3.5.1.2. is one of the conditions under which the test requirements are fulfilled. The time limits for the deactivation of the direction indicator do not change. Before this supplement, item (j) applied in case the lateral movement is initiated automatically. A second condition is new: the direction indicator control was not fully engaged (latched position) during the lane change manoeuvre. The text also says “ACSF of Category B1” instead of “B1”.
New number for the definition of specified maximum RCM operating range (para. 2.4.18.)
Paragraph 2.3.4.18. is renumbered as paragraph 2.4.18. It is the definition of “Specified maximum RCM operating range”. Its text does not change.
Q2Why it changed
- Proposed by
- Experts from the International Organization of Motor Vehicle Manufacturers and the European Association of Automotive Suppliers
- Working party
- GRVA, 9th session (February 2021)
Reasons
The lane centring change aims to align with the principle agreed for Automated Lane Keeping Systems (ALKS). The aim of this provision is to achieve stable vehicle behaviour, not necessarily a vehicle centred in the lane at all times. The driver can adapt the position to a vehicle driving close by in an adjacent lane, or drive with an offset to avoid lane ruts. In these cases, centring the vehicle in lane would not be the appropriate control strategy for ACSF of Category B1.
Sources (2)
“The suggested change aims to align with the principle agreed for Automated Lane Keeping Systems (ALKS), where the aim of this provision is to achieve stable vehicle behaviour”
“adapts the position to a vehicle driving close by in an adjacent lane or drives with an offset to avoid lane ruts, centering the vehicle in lane would not be the appropriate ACSF of Category B1 control strategy.”
When changing from one highway to another, the road can temporarily change down to one lane. In this case, the ACSF of Category C should be permitted to remain in stand-by. Having to reactivate it while ACSF of Category B1 remains active would not be understandable to the driver.
Sources (2)
“When changing from one highway to another, where the road e.g. temporarily changes down to one lane, the ACSF of Category C should be permitted to remain in stand-by”
“while ACSF of Category B1 remains active would not be understandable to the driver.”
The original overriding provision contradicts itself. It refers to the system remaining in standby mode, under the precondition that priority is given to the driver. During standby mode the system would not be allowed to provide any support, so there would be no need to require priority to the driver.
Sources (2)
“The original provision contradicts itself, as it refers to the system remaining in standby mode, under the precondition that priority is given to the driver.”
“During standby mode the system would not be allowed to provide any support, so there wouldn’t be any need to require priority to the driver.”
Type approval testing should also be possible during the winter months. For this, it should be possible to test vehicles also on wet surfaces or at lower temperatures.
Source
“In order to ensure type approval testing also during the winter months it should be possible to test vehicles also on wet surfaces or at lower temperatures.”
The change aims to amend the pass condition in item (j) according to the amended direction indicator provisions adopted at the fifth GRVA session. Under those provisions, automatic deactivation is only required when the LCM is initiated automatically and the direction indicator was not fully latched.
Sources (2)
“This amendment aims to amend the pass condition with regard to direction indicator deactivation according to the amended provisions on direction indicator deactivation as adopted at fifth session of GRVA”
“where automatic deactivation is only required when the LCM is initiated automatically and the direction indicator wasn’t fully latched.”
Document trail
- 2020-11ProposalECE/TRANS/WP.29/GRVA/2021/9Proposal by the experts from OICA and CLEPA
- —Amended in sessionGRVA-09-30Amendments to the proposal in session, by the experts from OICA and CLEPA
- —Working party adoptsECE/TRANS/WP.29/GRVA/9Session report, para. 49
- 2021-04Sent to WP.29ECE/TRANS/WP.29/2021/72Text that GRVA sent to WP.29 and AC.1
- 2021-06WP.29 adoptsECE/TRANS/WP.29/1159Adopted at the 184th session (session report, para. 127)
- 2022-01-07In forceC.N.10.2022.TREATIES-XI.B.16.79UN depositary notification
Q3Who is affected
Vehicle manufacturer
- Be ready to demonstrate the lane centring strategy of paragraph 5.6.4.1.2. to the Technical Service during type approval.
- Decide whether your ACSF of Category C uses the new exception to automatic deactivation at a road type transition.
- Before you ask for tests under deviating test conditions, make sure the performance requirements are still met.
- Check your direction indicator deactivation against the two conditions of item (j).
Component supplier
- Give the vehicle manufacturer the information it needs to demonstrate the lane centring strategy of paragraph 5.6.4.1.2.
- Check the automatic deactivation logic of your ACSF of Category C against the new exception at a road type transition.
- If your system remains active while the driver overrides, make sure that priority is given to the driver.
Technical service / Approval authority
- Be ready for the demonstration of the lane centring strategy of paragraph 5.6.4.1.2. by the vehicle manufacturer.
- Decide whether you agree to manufacturer requests for tests under deviating test conditions.
- Check that the performance requirements are still met in tests under deviating test conditions.
- Use the two conditions of item (j) when you assess the direction indicator deactivation.
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ⓘ This report gives advice only. It is not legal or type-approval advice.
More UN R79 change reports
- 05 series — Supplement 1
- 05 series — Base text
- 04 series — Supplement 12
- 04 series — Supplement 11
- 04 series — Supplement 10
- 04 series — Supplement 9
- 04 series — Supplement 8
- 04 series — Supplement 7
- 04 series — Supplement 6
- 04 series — Supplement 5
- 04 series — Supplement 4
- 04 series — Supplement 3
- 04 series — Supplement 2
- 04 series — Supplement 1
- 04 series — Base text
- 03 series — Supplement 17
- 03 series — Supplement 16
- 03 series — Supplement 15
- 03 series — Supplement 14
- 03 series — Supplement 13
- 03 series — Supplement 12
- 03 series — Supplement 11
- 03 series — Supplement 10
- 03 series — Supplement 9
- 03 series — Supplement 8
- 03 series — Supplement 7
- 03 series — Supplement 6
- 03 series — Supplement 4
- 03 series — Supplement 3
- 03 series — Supplement 2
- 03 series — Supplement 1