BMW I3 Fast Charging LIM Module

The BMW LIM module is a CCS, CHAdeMO and AC charging controller. It is used to communicate between the vehicle and the public charging infrastructure, to allow fast charging to occur.

As these can be found affordably on eBay and from auto wreckers, they have been pursued as an open-source charger project.

External links

Forum discussion

github.com/damienmaguire/BMW-i3-CCS

> CAN logs

> STM32 VCU software

> I3 LIM CAN dbc1

BMW I3 HV components

Design Guide for Combined Charging System (2015)

LIM versions

Only AC_DCO versions work for CCS. (Check if you have a MAC address on the label!)

LIM versions

SN	IEC 61851 J1772 (AC)	DIN 70121	ISO 15118	ISO 15118-20	Cars	Used until	Tested
61 35 9 346 827	x	x			BMW i3
61 35 9 346 820	x	x			BMW i3
61 35 9 353 646	x	x			BMW i3	Jul 2014	x
61 35 9 380 352	x	x	?		BMW i3	Nov 2015
61 35 6 805 847	x	x	?		BMW i3	Jul 2016
61 35 9 494 498	x	x	?		BMW i3	2018?	x
61 35 9 470 199	x	x	?		BMW i3	?
61 35 9 454 319	x	x	x	?	BMW i3 Mini cooper SE	now

The LIM's are available new from BMW spare parts suppliers for € 240 but there is probably some programming necessary. ???

Power Limits

The limits for pre 2017/26 (Week 26 of 2017) are 0V-500V 0A-250A, post 2017/27 (Week 27 of 2017) 0V-1000V -500A-+500A.

This probably indicates when they moved from DIN 70121 only to ISO 15118.

Connectors and Pinouts

BMW i3 LIM CCS Charging Module

Connector Key (left to right)

Label	Description	Compatible Plugs
4B	12 Pin Connector	BMW 61138373632 Audi 4E0 972 713 TE 1534152-1 / 1534151-1
3B	8 Pin Connector (CHAdeMO models only)	BMW 61138364624 Audi 4F0 972 708 TE 1-1534229-1
1B	16 Pin Connector	Hirschmann 805-587-545
2B	6 Pin Connector	BMW 61138383300 Audi 7M0 973 119 TE 1-967616-1
X	Replacement Pins	5-962885-1
X	Rubber Seal	1-967067-1

1B Pinout:

Pin #	Function	Description
1B-1	-
1B-2	-
1B-3	LED_M	Lighting Charge Socket? (Not necessary)
1B-4	LOCK_MOT+	Charge Inlet Lock Motor
1B-5	LOCK_MOT-	Charge Inlet Lock Motor
1B-6	CAN_H	Powertrain CAN
1B-7	CAN_L	Powertrain CAN
1B-8	IGN	Wake up signal +12V (ignition, contact 15)
1B-9	VCC	Constant Power +12V
1B-10	GND	Ground
1B-11	-
1B-12	-
1B-13	-
1B-14	-	Internally connected to GND
1B-15	CHARGE_E	Goes to KLE. Guessing this is charge enabled signal for the in car charger? or drive interlock signal?
1B-16	LOCK_FB	Charge Inlet Lock Feedback (1k unlocked, 11k locked?)

2B Pinout:

Pin #	Function	Description
2B-1	CP	Pilot (Charge Inlet)
2B-2	PP	Proxy (Charge Inlet)
2B-3	Jumper	Connected to Pin 4
2B-4	Jumper	Connected to Pin 3
2B-5	GND	Ground (Charge Inlet)
2B-6		US CCS1 version connected to 2B-2

3B Pinout:

- N/A (for CHAdeMO only)

4B Pinout:

Pin #	Function	Description
4B-1	HV_POS+	Positive Contactor Control (Contactor coil resistance needs to be ~15 ohms)
4B-2	HV_NEG+	Negative Contactor Control
4B-3	HV_POS-	Positive Contactor Control
4B-4	HV_NEG-	Negative Contactor Control
4B-5	U_HV_DC	Charge Inlet DC Voltage (current input 3-20mA?)
4B-6	LED_RT	Charge Status Light
4B-7	LED_GN	Charge Status Light
4B-8	LED_BL	Charge Status Light
4B-9	LED_GND	Charge Status Light Ground
4B-10	COV_MOT-	Charge Inlet Cover Motor (Not necessary)
4B-11	COV_MOT+	Charge Inlet Cover Motor (Not necessary)
4B-12	COV_FB	Charge Inlet Cover Feedback (GND if open)

Wiring Diagram

Wiring LIM electric vehicle charge controller

Required messages

this list has to be cleaned up once we know which messages are actually necessary for the LIM.

Power Train CAN messages [500kbps]

ID	Function	interval	Notes
0x112	BMS msg.	10ms
0x1A1	Vehicle speed	20ms
0x3E9	Main LIM control	200ms
0x431	Battery info	200ms	needed but does not control anything
0x03C	Vehicle status	200ms
0x2A0	Central locking	200ms
0x397	OBD	200ms
0x3F9	Engine info	200ms	Rex?
0x3A0	Vehicle condition	200ms
0x330	Range info	200ms
0x432	BMS SoC	200ms
0x51A	Network management	200ms
0x540	Network management 2	200ms
0x512	Network management edme	200ms
0x560	Network management kombi	200ms
0x510	Network management zgw	200ms
0x328	Counter	1s
0x3E8	OBD reset	1s
0x2FA	Lim DC charge command 3.	1s
0x12F	Wake up	100ms
0x2FC	Charge flap control	100ms
0x2F1	Lim DC charge command 2.	100ms

LIM peripheral boards

Isolated DC charge inlet voltage sense board

The LIM gets the inlet DC voltage from a board in the KLE.

This board needs to produce an isolated 3-20mA current signal from the high voltage DC voltage.

isolated DC Voltage sense board by muehlpower

Large fast charging contactor control board

The LIM probably measures the current draw of the pos and neg fast charging contactors which makes it a bit harder to use large Gigavac contactors with economiser.

We need a relay board with resistors to simulate the original relais coils which have ~15 ohms (@14V ~840mA).

Further investigation is needed to find out if the LIM also detects a contactor failure from the current draw profile.

Duosida inlet lock driver

The i3 has a quite expensive Phoenix CCS inlet and it would be nice to be able to use the cheaper Duosida CCS inlets.

The charge inlet lock should work with the Duosida lock as well but the feedback (1k unlocked, 11k locked) is a bit different which requires some additional resistors.

CCS inlet lock

CCS charging sequence

CCS-Charging-sequence.jpg

This document actually covers Fast and Smart Charging Solutions for Full Size Urban Heavy Duty Applications but since most of the protocols used are similar it has comparable sequence diagrams with description for normal start up, normal shutdown, DC supply initiated emergency stop and EV initiated emergency stop.

https://assured-project.eu/storage/files/assured-10-interoperability-reference.pdf

Observations

VIN Numbers is not required for AC or DC fast charging to function

Functional LIMs have come from vehicles where the Air Bags have deployed, indicating that the module still works after a "Safety" event has occurred.