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| Document Title | Proposal for a new regulation on time-based tyre pressure loss reminder systems | ||||||||
| Reference Number | TPM-02-03 | ||||||||
| Date |
29 Apr 2008
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| Summary | German informal document GRRF-63-23 proposing a new regulation on "uniform provisions concerning the approval of time-based tyre pressure loss reminder systems (TBW) and tyre-pressure monitoring systems (TPMS) and tyre leak alerting systems for motor vehicles". | ||||||||
| Source(s) | Germany | ||||||||
| Rulemaking Area(s) | UN R64 Spare Tires | ||||||||
| Meeting(s) | |||||||||
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| UNECE server | .pdf format | ||||||||
| Excerpts from session reports related to this document | |||||||||
| TPM | Session 2 | 18-19 Mar 2008 |
Mr. Hesse reported that inf. doc. GRRF-63-23 was produced under time pressure and there is certainly room for improvement. The document is based on the following philosophy: There are two main aspects related to tyre pressure, the environmental aspect (fuel consumption/CO2-emission) and the safety aspect (tyre failure due to low pressure). The environmental aspect could be covered by TBW, a systems which reminds the driver to check his tyre pressure after a certain period and to refill the air which is lost due to natural diffusion. The safety aspect could be covered by a TPMS which warns the driver if the tyre pressure has decreased considerably, e.g. by a tyre defect. Details about the performance of TPMS still need to be discussed. Germany could accept low cost indirect systems when they are in addition to a reminder system like TBW. OICA agreed with this philosophy and presented a diagram which showes that TBW could even lead to less under-inflation than TPMS because TPMS needs bigger warning thresholds in order to avoid false alarms which could have the consequence that the driver disregards the warning completely. In any case the reminder intervals of TBW must be chosen carefully. Too short intervals could have the same consequence as false warnings of TPMS, they could be disregarded by the driver. OICA will look into this this question more deeply and will try to answer the question if TBW could be improved by taking into accout further parameters like driven distances or temperatures. Some delegates could not follow this philosophy because they fear that the driver does not regard the signal of a TBW. Japan proposed to introduce TBW in combination with a TPMS, which is based on US FMVSS 138. The discussion about this item could not be finished during this meeting. In order to make progress it was decided to continue the discussion in a new task force group which will be chaired by OICA. The first meeting of this group will take place on 1st April 2008 in Paris, starting at 11.00 h. OICA will sent the invitation for this meeting to all members of this group. |
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