Tesla Model 3 Drive Unit PCB Parameters: Difference between revisions

Latest revision as of 18:18, 13 December 2025

The [stm32-sine M3_DU] firmware has additional parameters over the regular stm32-sine Parameters.

The following additional parameters can be configured:

Name	Unit	Min	Max	Default	Description
Motor
encmode		0	6	0	6=High frequency 8.8kHz resolver exciter to support the Tesla M3 resolver
snsm		12	24	12	Motor temperature sensor. 24=TeslaM3. Note: Some drive units are not fitted with a sensor but this should still be selected to ensure correct operation of the inverter firmware.
Inverter
snshs		0	8	0	Heatsink temperature sensor. 12=TeslaM3
Oil Pump
tmpoilmax	°C	70	100	100	Maximum permitted temperature for the oil. As the oil temperature gets within 10°C of the maximum the throttle will be limited to be 10% per °C. For example at 9°C below the limit the throttle cannot exceed 90%.
tmpoilhigh	°C	10	100	45	The upper temperature bound for the oil speed control. If the temperature exceeds this the pump will operate at full speed (255).
tmpoillow	°C	10	100	25	The lower temperature bound for the oil speed control. If the temperature exceeds this the pump speed will vary linearly between pumpspeed or pumpspeedidle and the maximum possible speed.
pumpspeed	dig	0	255	70	The minimum speed (0-255) of the oil pump when the inverter is in run mode. The speed can be higher at elevated temperatures.
pumpspeedidle	dig	0	255	17	The minimum speed (0-255) of the oil pump when the inverter is idle. The speed can be higher at elevated temperatures to pull heat out of the motor after the vehicle has come to a stop.

The following additional values are available for diagnostic purposes:

Name	Unit	Description
tmpoil	°C	The oil temperature as measured by the oil pump in the drive unit. This can be used as a proxy for the motor temperatures for drive units which lack a dedicated sensor.
upmp	V	Supply voltage to the oil pump (typically 12-14V)
pmprev	RPM	The rotational speed of the oil pump in rpm.
oilpres	PSI	The oil pressure measured by the pump
m3_phaseA_hi		The status of the Phase A high-side gate driver chip on the inverter PCB. Anything other than "Ok" indicates a serious fault.
m3_phaseA_lo		The status of the Phase A low-side gate driver chip on the inverter PCB.
m3_phaseB_hi		The status of the Phase B high-side gate driver chip on the inverter PCB.
m3_phaseB_lo		The status of the Phase B low-side gate driver chip on the inverter PCB.
m3_phaseC_hi		The status of the Phase C high-side gate driver chip on the inverter PCB.
m3_phaseC_lo		The status of the Phase C low-side gate driver chip on the inverter PCB.

@@ Line 43: / Line 43: @@
 |°C
 |70
-|300
+|100
-|300
+|100
 |Maximum permitted temperature for the oil. As the oil temperature gets within 10°C of the maximum the throttle will be limited to be 10% per °C. For example at 9°C below the limit the throttle cannot exceed 90%.
 |-
@@ Line 50: / Line 50: @@
 |°C
 |10
-|300
+|100
 |45
 |The upper temperature bound for the oil speed control. If the temperature exceeds this the pump will operate at full speed (255).
@@ Line 57: / Line 57: @@
 |°C
 |10
-|300
+|100
 |25
 |The lower temperature bound for the oil speed control. If the temperature exceeds this the pump speed will vary linearly between pumpspeed or pumpspeedidle and the maximum possible speed.