[Code of Federal Regulations]

[Title 40, Volume 31]

[Revised as of July 1, 2006]

From the U.S. Government Printing Office via GPO Access

[CITE: 40CFR1065.125]



[Page 687]

 

                   TITLE 40--PROTECTION OF ENVIRONMENT

 

         CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY (CONTINUED)

 

PART 1065_ENGINE-TESTING PROCEDURES--Table of Contents

 

                   Subpart B_Equipment Specifications

 

Sec.  1065.125  Engine intake air.



    (a) Use the intake-air system installed on the engine or one that 

represents a typical in-use configuration. This includes the charge-air 

cooling and exhaust gas recirculation systems.

    (b) Measure temperature, humidity, and atmospheric pressure near the 

entrance to the engine's air filter, or at the inlet to the air intake 

system for engines that have no air filter. You may use a shared 

atmospheric pressure meter as long as your equipment for handling intake 

air maintains ambient pressure where you test the engine within 1 kPa of the shared atmospheric pressure. You may use a 

shared humidity measurement for intake air as long as your equipment for 

handling intake air maintains dewpoint where you test the engine to 

within 0.5 [deg]C of the shared humidity 

measurement.

    (c) Use an air-intake restriction that represents production 

engines. Make sure the intake-air restriction is between the 

manufacturer's specified maximum for a clean filter and the 

manufacturer's specified maximum allowed. Measure the static 

differential pressure of the restriction at the location and at the 

speed and torque set points specified by the manufacturer. If the 

manufacturer does not specify a location, measure this pressure upstream 

any turbocharger or exhaust gas recirculation system connection to the 

intake air system. If the manufacturer does not specify speed and torque 

points, measure this pressure while the engine outputs maximum power. As 

the manufacturer, you are liable for emission compliance for all values 

up to the maximum restriction you specify for a particular engine.

    (d) This paragraph (d) includes provisions for simulating charge-air 

cooling in the laboratory. This approach is described in paragraph 

(d)(1) of this section. Limits on using this approach are described in 

paragraphs (d)(2) and (3) of this section.

    (1) Use a charge-air cooling system with a total intake-air capacity 

that represents production engines' in-use installation. Maintain 

coolant conditions as follows:

    (i) Maintain a coolant temperature of at least 20 [deg]C at the 

inlet to the charge-air cooler throughout testing.

    (ii) At maximum engine power, set the coolant flow rate to achieve 

an air temperature within 5 [deg]C of the value 

specified by the manufacturer at the charge-air cooler outlet. Measure 

the air-outlet temperature at the location specified by the 

manufacturer. Use this coolant flow rate set point throughout testing.

    (2) Using a constant flow rate as described in paragraph (d)(1)(ii) 

of this section may result in unrepresentative overcooling of the intake 

air. If this causes any regulated emission to decrease, then you may 

still use this approach, but only if the effect on emissions is smaller 

than the degree to which you meet the applicable emission standards. If 

the effect on emissions is larger than the degree to which you meet the 

applicable emission standards, you must use a variable flow rate that 

controls intake-air temperatures to be representative of in-use 

operation.

    (3) This approach does not apply for field testing. You may not 

correct measured emission levels from field testing to account for any 

differences caused by the simulated cooling in the laboratory.