Validate the execution of your duty cycle according to this section unless the standard-setting part specifies otherwise. This section describes how to determine if the engine's operation during the test adequately matched the reference duty cycle. This section applies only to speed, torque, and power from the engine's primary output shaft. Other work inputs and outputs are not subject to cycle-validation criteria. You must compare the original reference duty cycle points generated as described in § 1065.512 to the corresponding feedback values recorded during the test. You may compare reference duty cycle points recorded during the test to the corresponding feedback values recorded during the test as long as the recorded reference values match the original points generated in § 1065.512 . The number of points in the validation regression are based on the number of points in the original reference duty cycle generated in § 1065.512 . For example if the original cycle has 1199 reference points at 1 Hz, then the regression will have up to 1199 pairs of reference and feedback values at the corresponding moments in the test. The feedback speed and torque signals may be filtered-either in real-time while the test is run or afterward in the analysis program. Any filtering that is used on the feedback signals used for cycle validation must also be used for calculating work. Feedback signals for control loops may use different filtering.
Table 1 to Paragraph (d) of § 1065.514 -Permissible Criteria for Omitting Points From Duty-Cycle Regression Statistics
When operator demand is at its . . . | you may omit . . . | if . . . |
For reference duty cycles that are specified in terms of speed and torque (fnref, Tref) | ||
minimum | power and torque | Tref [LESS THAN] 0% (motoring). |
minimum | power and speed | fnref = 0% (idle speed) andTref = 0% (idle torque) andTref-(2% ·Tmax mapped) [LESS THAN]T [LESS THAN] Tref + (2% ·Tmax mapped). |
minimum | power and speed | fnref [LESS THAN] enhanced-idle speeda and Tref [GREATER THAN] 0%. |
minimum | power and either torque or speed | fn [GREATER THAN]fnref orT [GREATER THAN] Tref but not iffn [GREATER THAN] (fnref· 102%) andT [GREATER THAN] Tref + (2% ·Tmax mapped). |
maximum | power and either torque or speed | fn [LESS THAN]fnref orT [LESS THAN] Tref but not iffn [LESS THAN] (fnref· 98%) andT [LESS THAN] Tref-(2% ·Tmax mapped). |
For reference duty cycles that are specified in terms of speed and power (fnref, Pref) | ||
minimum | power and torque | Pref [LESS THAN] 0% (motoring). |
minimum | power and speed | fnref = 0% (idle speed) andPref = 0% (idle power) andPref-(2% ·Pmax mapped) [LESS THAN]P [LESS THAN] Pref + (2% ·Pmax mapped). |
minimum | power and either torque or speed | fn [GREATER THAN]fnref orP [GREATER THAN] Pref but not iffn [GREATER THAN] (fnref· 102%) andP [GREATER THAN] Pref + (2% ·Pmax mapped). |
maximum | power and either torque or speed | fn [LESS THAN]fnref orP [LESS THAN] Pref but not if fn [LESS THAN] (fnref· 98%) andP [LESS THAN] Pref-(2% ·Pmax mapped). |
a Determine enhanced-idle speed from ECM broadcast or a practice cycle.
Table 2 of § 1065.514 -Default Statistical Criteria for Validating Duty Cycles
Parameter | Speed | Torque | Power |
Slope, a1 | 0.950 [LESS THAN EQUAL TO] a1 [LESS THAN EQUAL TO] 1.030 | 0.830 [LESS THAN EQUAL TO] a1 [LESS THAN EQUAL TO] 1.030 | 0.830 [LESS THAN EQUAL TO] a1 [LESS THAN EQUAL TO] 1.030. |
Absolute value of intercept, |a0| | [LESS THAN EQUAL TO] 10% of warm idle | [LESS THAN EQUAL TO] 2% of maximum mapped torque | [LESS THAN EQUAL TO] 2% of maximum mapped power. |
Standard error of the estimate, SEE | [LESS THAN EQUAL TO] 5% of maximum test speed | [LESS THAN EQUAL TO] 10% of maximum mapped torque | [LESS THAN EQUAL TO] 10% of maximum mapped power. |
Coefficient of determination, r2 | [GREATER THAN EQUAL TO] 0.970 | [GREATER THAN EQUAL TO] 0.850 | [GREATER THAN EQUAL TO] 0.910. |
40 C.F.R. §1065.514