COP/ISC/IUPR
COP/ISC/IUPRm
ISC stands for In-Service Conformity (ISC) andIUPR stands for In-Use Performance Ratio (IUPR).This is a mandatory requirement under Automotive BS-VI / OBD-IIemission regulations for vehicles which are in-service / in-use.
It verifies how well the vehicle’s On-Board Diagnostics (OBD)system and its emission control systems are performing their intended functions, to detect malfunctions and ensure compliance with emission norms throughout the useful life of the vehicle.
Light Duty Vehicles
In-Service Conformity (ISC) for Light Duty Vehicles:
ISC is applicable for BS VI Vehicles. The ISC is conducted on the basis of any relevant information that the manufacturer has, under the same procedures as those for the conformity of production.
The in-service family may be defined by basic design parameters which shall be common to vehicles within the family as defined in AIS 137 Part 3.
The information gathered by the manufacturer shall be sufficiently comprehensive to ensure that in-service performance can be assessed for normal conditions of use. The sampling shall be drawn from at least two regions with substantially different vehicle operating conditions. Factors such as differences in fuels, ambient conditions, average road speeds, and urban/highway driving split shall be taken into consideration in the selection of the regions.
The vehicle shall have been in service for at least 15000 km or 6 months, whichever is the later, and for no more than 100000 km or 5 years, whichever is sooner.
The number of sample lots shall depend on the annual sales volume of an in-service family.
| Sample Size | |
|---|---|
|
- Sales volume - per year (for tailpipe emission tests) - of vehicles of an OBD family with IUPR in the sampling period |
Number of sample lots |
| Up to 100,000 | 1 |
| 100,001 to 200,000 | 2 |
| Above 200,000 | 3 |
The in-service tailpipe emissions conformity tests shall be continuously carried out reflecting the production cycle of applicable vehicles types within a given in-service vehicle family. The maximum time period between commencing two in-service conformity checks shall not exceed 18 months. In the case of vehicle types covered by an extension to the type approval that did not require an emissions test, this period may be extended up to 24 months.
In Use Performance Ratio Monitoring (IUPRM) for Light Duty Vehicles:
IUPRM in-service conformity is applicable from April 2022 for BSVI vehicles approved as per AIS 137 Part 3.
The In-Use Performance Ratio (IUPR) of a specific monitor M of the OBD systems and in-use performance of pollution control devices shall be:
IUPRM = NumeratorM / DenominatorM
The OBD/IUPRM family shall be defined by basic design parameters which shall be common to vehicles within the family as defined in AIS 137 Part 3.
For families consisting of fewer than 5,000 registrations that are subject to sampling within the sampling period, the minimum number of vehicles in a sample lot is six.
For all other families, the minimum number of vehicles in a sample lot to be sampled is fifteen.
The number of sample lots shall depend on the annual sales volume of an in-service family.
| Sample Size | |
|---|---|
|
- Sales volume - per year (for tailpipe emission tests) - of vehicles of an OBD family with IUPR in the sampling period |
Number of sample lots |
| Up to 100,000 | 1 |
| 100,001 to 200,000 | 2 |
| Above 200,000 | 3 |
Vehicles of small series productions with less than 1000 vehicles per OBD/IUPRM family are exempted from minimum IUPR requirements.
Heavy Duty Vehicles
ISC (In-Service Conformity) and IUPR (In-Use Performance Ratio) Period:
After the granting of type-approval for a family the manufacturer shall perform ISC and IUPR testing on this family within 18 months from the date of first registration of a vehicle fitted with an engine from that family or from 1st April 2023 whichever is later.
In case of multistage type-approval first registration means first registration of a completed vehicle. The testing shall be repeated at least every two years for each family periodically on vehicles over their useful life.
ISC
The conformity of in-service vehicles or engines of a family shall be demonstrated by testing vehicles on the road operated over their normal driving patterns, conditions and payloads.
The in-service conformity test shall be representative for vehicles operated on their real driving routes, with their normal load and with the usual professional driver of the vehicle.
| Pollutant | CFpollutant |
|---|---|
| NOx |
1 + margin(5) NOx With margin NOx = 0.43 |
| PN(1) |
1 + margin(6) PN With margin PN = 0.5 |
| CO(2) | - |
| Parameter | Maximum Allowed Conformity Factor (CF) |
|---|---|
| CO | 1.5 |
| THC(1) | 1.5 |
| NMHC(2) | 1.5 |
| CH4(2) | 1.5 |
| NOx | 1.5 |
IUPR
The in-use performance ratio (IUPR) of a specific monitor (m) or group of monitors (g) of the OBD system shall be calculated by the following formula:
IUPR = Numerator / Denominator
where
‘Numerator’ means the numerator of a specific monitor (m) or group of monitors (g) and is a counter indicating the number of times a vehicle has been operated in such a way that all monitoring conditions necessary for that specific monitor (m) or group of monitors (g) to detect a malfunction have been encountered;
and
‘Denominator’ means the denominator of a specific monitor (m) or group of monitors (g) and is a counter indicating the number of vehicles driving cycles that are of relevance to that specific monitor (m) or group of monitors (g) [or, “in which events occur that are of relevance to that specific monitor.”].
The in-use performance ratio (IUPRg) of a group g of monitors on board of a vehicle is equivalent to the lowest IUPR value of specific monitors in that group.
The procedure and requirements prescribed in AIS 137 Part 4 is followed for vehicles with GVW exceeding 3500 kg.