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§1065.510 Engine mapping. (g ) Mapping engines with an electric hybrid systems

. Map engines that include electric hybrid

systems as described in this paragraph (g). Do not use this procedure for engines used in hybrid vehicles where the hybrid system is c ertified as part of the vehicle rather than the engine. You may ask to apply these provisions to other types of hybrid engines, consistent with good engineering judgment. F ollow the steps for mapping a variable

- speed engine as given in

parag raph (b) of th is section. Note that you are generally required to generate two separate engine maps: one with the hybrid system active, and one with it inactive. Apply the provisions of paragraph (b)(5) of this section as follows: (1) This paragraph (g)(1) specifies h ow to generate a map with the hybrid system inactive. Note that this is generally necessary for engine s subject to steady

- state duty cycles (i.e., discrete

- mode or ramped

- modal) . Operate the engine at warm idle speed until the renewable energy storage

sy stem (RESS) is depleted. Once the RESS is depleted, p erform an engine map as specified in paragraph (b)(5) of this section. Ensure that instantaneous power from the RESS remains less

than 2 % of the instantaneous measured power from the engine at all eng ine speeds

. (2) This paragraph (g)(2) specifies how to generate a map with the hybrid system active using a nominally continuous method or a discrete method. You may use either of the following methods to generate a map with the hybrid system active: (i ) Y ou may perform an engine map by using a series of continuous sweep s of narrow speed

ranges. Note that the purpose of this mapping approach is to determine the maximum torque available at each speed such as might occur during transient operation with a fully charged

RESS. Begin by fully charging the RESS. Perform the sweep as specified in paragraph (b)(5) of this section, but s top the ramp to charg e the RESS when the power measured from the RESS drops below maximum expected RESS power by more than 2 % of total system power (including engine and RESS power). Unless good engineering judgment indicates otherwise, assume that the maximum expected RESS power is equal to the measured RESS power at the start of the ramp. (Note that this assumption is not val id where the RESS is torque limited.) Calculate total system power as a 3 second moving average of total system power

. For example

, if the 3 second moving average of total engine

- RESS power is 200 kW and the power from the RESS at the beginning of the ra mp is 50 kW, once the power from the RESS reaches 46 kW

, stop the ramp to charge the RESS. A fter each charging event, stabilize the engine for 15 seconds at the speed at which you ended the previous segment with operator demand set to maximum

before conti nuing the ramp from that speed

. Repeat the cycle of charging, mapping, and recharging until you have completed the engine map. You may shutdown the system or include other operation between segment s to be consistent with the intent of this paragraph(g)(2 )(i). For example, for systems in which continuous charging and discharging can overheat batteries to an extent that affects performance, you may operate the engine at zero power from the RESS for enough time after the system is recharged to allow the bat teries to cool. Use good engineering judgment to smooth the torque curve to eliminate discontinuities between map intervals. (ii) Y ou may perform an engine map by using discrete speeds. Select map setpoints at intervals defined by the ranges of engine sp eed being mapped. From 95 % of warm idle speed to 90 % of

the manufacture r declared rated speed select setpoints that are 7.5 % of manufacture declaredrated speed apart. From 90 % to 110 % of manufacture r declared rated speed select setpoints

that are 2 .5 % of manufacture declared rated speed apart. From 90 % of manufacture declared rated speed to the highest speed above maximum power at which 50 % of maximum power

occurs select setpoints that are 7.5 % of manufacture declared rated speed apart. We ref er to this 50 % speed as the check point speed as described in paragraph (b)(5)(iii) of this section. At each setpoint, stabilize speed and target torque at about 7 0 % of peak torque of the non

- hybrid assisted engine

. Make sure the engine is fully warmed up and the RESS state of charge is within the normal operating range. Snap the throttle to maximum and stabilize the engine for at least 10

seconds and record the mean feedback speed and torque of the last (4 to 6) seconds

. Use linear interpolation to d etermine intermediate speeds and torques. Use this series of speeds and torques to generate the power map as described in paragraph (e) of this section.



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