OVMS User Manual page 38

OVMS: Renault Twizy User Guide
Keep in mind, even without considering the battery limits the SEVCON will protect itself and the
motor by limiting continous high currents to short periods of time (see "peak" & "boost"
specification).
Drive and recuperation levels & torque/speed maps
Default drive level is 100% (of the available power), the main tweak here is lowering the level to
increase economy / range or adapt to bad road conditions.
Default recuperation levels are rather low at 18.2% for both neutral and foot braking modes.
For each of the three situations "driving", "neutral braking" and "foot braking", the SEVON uses
both a speed lookup map and the overall level to determine how much of the actually technically
available maximum torque will be used at a given speed.
"Available maximum torque" differs for drive and neutral/brake mode: in drive mode, the available
torque is defined by the power map. In neutral and brake mode, the power map does not apply,
maximum torque equals the configured peak torque (first power parameter) at any speed.
The controller will first consult the drive mode specific torque map. Each of the three maps contains
four speed reference points at (by default) ~33, ~39, ~50 and ~66 kph. The torque level will be
interpolated for the current speed and multiplied with the overall level.
The default drive mode map does no limiting by speed, full power is available at every speed.
The default neutral and footbraking mode maps will limit recuperation power for higher speeds:
100%
80%
60%
40%
20%
0%
30 35 40
recuperation strength by speed and seemlessly integrate with braking. For example:
CFG RECUP 18 40
CFG TSMAP B 80 100 60 40
This will raise braking recuperation to 40% but scale the strength down for low speeds. The effect is
an electrical brake booster that integrates smoothly at every speed. If you want to fine tune the
curve to your torque profile, you can extend any or all of the four percentages by speed coordinates
in kph like this:
CFG TSMAP B 80@20 100 60 40@80
This would move the first 80% point from the default 33 to 20 kph and the last 40% point from 66
to 80 kph.
If you want recuperation free coasting on the highway, just set the 4th level in map "N" to 0.
45 50 55 60
The default power levels are
100 / 80 / 50 / 20 for
33 / 39 / 50 / 66 kph respectively.
So the maximum recuperation of 18.2% (of the
peak torque) will apply up to 33 kph.
If you raise the overall recuperation level, the
65 70
maps will provide the means to shape
38 / 77
2019/05/02 RT3.9.1