IR temperature probe and applicable standards

When testing emissions and pollution from light-duty vehicles, regulations require verification of engine temperature. A new technology has recently emerged: remote measurement using an infrared sensor. CAPELEC has developed an innovative solution—a non-contact measurement probe, CAP1320, which can be adapted for use on CAP320x series emissions test benches | Fast and efficient | Accurate | Easy to use | Rugged | This next-generation probe complies with current regulations in France and Europe.

What the standard specifies for the diesel procedure

SRV F9-2 stipulates the following during testing:

Ҥ 4.3: Requirements for temperature measurement:
 Engine oil temperature measurement is  performed using  the device or one of the devices specified by the manufacturer at the time of type approval ”

The LNE annex explains:

“What the type approval certificate LNE-6689 rev. 7 provides as evidence:”

The European directive incorporates these solutions:

2010/48/EU: lists the methods that meet the preconditioning requirements for conducting the test:

“Section 8.2.2.2: Opacity Measurement, Vehicle Conditioning, Requirements for Conditioning:
The engine must be warm: in other words, the engine oil temperature  measured by a sensor in the dipstick tube must be 80°C or correspond to the normal operating temperature if the latter  is lower, or the engine block temperature, measured based on the level of infrared radiation, must reach a value at least equivalent to that”

What the standard specifies for the gasoline procedure

SRV F9-1 stipulates provisions for conditioning during testing but does not specify the methods:

Ҥ 5.1: Preliminary checks:
 The engine is at its normal operating temperature. ”
 
“  § 4.1: The gas analyzer is equipped with—a system for measuring the engine’s operating temperature ”

At the same time, LNE Certificate 6688 notes that the engine temperature sensor is not part of the type examination: this leaves the manufacturer free to choose the most relevant and best-suited technique.