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extract from service manual
<onlyinclude>
This describes how the [[Gen2/Motor Controller|Sevcon controller]]'s features are used on Zero models.
;Throttle
:[[Sevcon]] provides the [[#Throttle|throttle]] with two mappings:
:# Mapping voltage to value in the first place (separately for forward and reverse)
:# An "input characteristic" profile which has linear, curved, crawl, and user-defined segmented options.
:The controller also supports:
:*Control modes targeting speed (used through 2012) versus torque (used in 2013+).
:*:The control mode translates the throttle signal into motor operation, so it makes the throttle target a speed or a level of torque.
:*Dual throttle inputs.
:*Regen proportional to the throttle.
:*Directional throttle.
:*Speed limit proportional to throttle.
:*Reverse speed limit.
;Regen
:The [[Sevcon]] controller manual refers to regen as braking, and has a number of recommendations and features disabled to help prevent wheel lockup for "on-highway applications".
;Braking
: The Sevcon can also apply reverse torque as braking or a reverse gear, and supports separate speed and torque limits while the motor is rotating in reverse, very important if used on a Zero since motorcycles are unstable when reversed so must operate within human walking speeds.
;OEM Programming
: Zero programs the Sevcon controller for their needs, above and beyond DOT, NHTSA, and EU vehicle manufacturing standards.
: Some of this is a bunch of settings and some of this seems to be a custom version of the firmware code.
: The new IPM motor may have demanded further customization than previous models, where custom firmware code is particularly relevant.
: ''Settings'' can be changed and restored, but not ''code'' without some OEM-supported technical assistance.
</onlyinclude>
[[Category:Explanation]]
This describes how the [[Gen2/Motor Controller|Sevcon controller]]'s features are used on Zero models.
;Throttle
:[[Sevcon]] provides the [[#Throttle|throttle]] with two mappings:
:# Mapping voltage to value in the first place (separately for forward and reverse)
:# An "input characteristic" profile which has linear, curved, crawl, and user-defined segmented options.
:The controller also supports:
:*Control modes targeting speed (used through 2012) versus torque (used in 2013+).
:*:The control mode translates the throttle signal into motor operation, so it makes the throttle target a speed or a level of torque.
:*Dual throttle inputs.
:*Regen proportional to the throttle.
:*Directional throttle.
:*Speed limit proportional to throttle.
:*Reverse speed limit.
;Regen
:The [[Sevcon]] controller manual refers to regen as braking, and has a number of recommendations and features disabled to help prevent wheel lockup for "on-highway applications".
;Braking
: The Sevcon can also apply reverse torque as braking or a reverse gear, and supports separate speed and torque limits while the motor is rotating in reverse, very important if used on a Zero since motorcycles are unstable when reversed so must operate within human walking speeds.
;OEM Programming
: Zero programs the Sevcon controller for their needs, above and beyond DOT, NHTSA, and EU vehicle manufacturing standards.
: Some of this is a bunch of settings and some of this seems to be a custom version of the firmware code.
: The new IPM motor may have demanded further customization than previous models, where custom firmware code is particularly relevant.
: ''Settings'' can be changed and restored, but not ''code'' without some OEM-supported technical assistance.
</onlyinclude>
[[Category:Explanation]]