This section describes a powertrain testing procedure for simulating a chassis test with a pre-transmission or post-transmission hybrid system to perform A to B testing of Phase 1 vehicles. These procedures may also be used to perform A to B testing with non-hybrid systems. See 40 CFR 1036.545 for Phase 2 and later hybrid systems.
Where:
vcyclei = vehicle speed of the test cycle for each point, i, starting from i = 1.
ka = drive axle ratio, as declared by the manufacturer.
r = radius of the loaded tires, as declared by the manufacturer.
Where:
T = instantaneous measured torque at the transmission output shaft.
Fbrake = instantaneous brake force applied by the driver model to add force to slow down the vehicle.
t = elapsed time in the driving schedule as measured by the dynamometer, in seconds.
Table 1 of § 1037.555 -Statistical Criteria for Validating Duty Cycles
Parameter | Speed control |
Slope, a1 | 0.950 [LESS THAN EQUAL TO] a1 [LESS THAN EQUAL TO] 1.030. |
Absolute value of intercept, |a0| | [LESS THAN EQUAL TO]2.0% of maximum test speed. |
Standard error of the estimate, SEE | [LESS THAN EQUAL TO]5% of maximum test speed. |
Coefficient of determination, r2 | [GREATER THAN EQUAL TO]0.970. |
40 C.F.R. §1037.555