GS450H Discussion

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slow67
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GS450H Discussion

Post by slow67 »

Kevin Sharpe wrote: Fri Mar 27, 2020 12:02 am People love to speculate but lets bring this thread back on topic and focus on Lexus GS450H VCU Support :)
Question, what is the solenoid pattern for low and high gear? I thought I read that Low/Low is high gear (and that is what is in the current code from Damien).

What is the feedback for PB1, 2, and 3?
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Re: GS450H Discussion

Post by Dilbert »

On the diagrams they show as 3 switches, I believe they are pressure switches for oil pressure.
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Re: GS450H Discussion

Post by slow67 »

Dilbert wrote: Fri Mar 27, 2020 7:07 am On the diagrams they show as 3 switches, I believe they are pressure switches for oil pressure.
Right, but I was wondering if anyone deciphered which switch is active, and when. I have some guesses, but I won't have my plug for the solenoids/pressure switches until sometime next week so I can't test them.

Edit: Here are my guesses looking at the pictures of the valvebody (and my background on valve bodies):
PB2: High unless the electric pump is making pressure
PB3: High unless the mechanical pump is making pressure
PB1: Either High/low based on low or high gear, based on actuator feed pressure (pressure circuit the solenoids use to move the shift valve), or based on lube circuit pressure.

Im very certain TransSP is to control line pressure in the transmission (after the check valves for the 2 pumps).
If TransSL1 Low and TransSL2 Low = high gear, then most likely High/High is high gear. One of them is likely for brake 1, and the other for brake 2. We may need to time the the shift to prevent drag/flare.
RE3Rotor
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Re: GS450H Discussion

Post by RE3Rotor »

I am not an EE. But I do have a GS450h for a daily now. Is there anyway I can help in deciphering some of these mysteries?
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Re: GS450H Discussion

Post by slow67 »

RE3Rotor wrote: Fri Mar 27, 2020 6:32 pm I am not an EE. But I do have a GS450h for a daily now. Is there anyway I can help in deciphering some of these mysteries?
Maybe you could tap into the wires into the trans and see the the status of the solenoids and the pressure switches? Maybe figure out the frequency of the SP Solenoid?


Image
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Re: GS450H Discussion

Post by RE3Rotor »

I will figure out what is the easiest/best way to tap into those signals.
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Re: GS450H Discussion

Post by PacEmaker »

I have a different question about the GS450h transmission - does anyone know what the DC resistance of the motor windings should read in both MG1 and MG2, and what tolerance between windings in any one motor is allowed?

I might start another thread for this question...
Geoff

Is this smoke trying to tell me something ... :twisted:
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Re: GS450H Discussion

Post by Kevin Sharpe »

RE3Rotor wrote: Sat Mar 28, 2020 5:25 am I will figure out what is the easiest/best way to tap into those signals.
That would be a great help, many thanks :)
This is a personal post and I disclaim all responsibility for any loss or damage which any person may suffer from reliance on the information and material in this post or any opinion, conclusion or recommendation in the information and material.
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Re: GS450H Discussion

Post by Dilbert »

RE3Rotor wrote: Sat Mar 28, 2020 5:25 am I will figure out what is the easiest/best way to tap into those signals.
I’m not overly familiar with th gs450h architecture, but I’d imagine these go to the high voltage ecu, usually behind the glove box inside the car.
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Re: GS450H Discussion

Post by slow67 »

Kevin Sharpe wrote: Sat Mar 28, 2020 11:13 am
RE3Rotor wrote: Sat Mar 28, 2020 5:25 am I will figure out what is the easiest/best way to tap into those signals.
That would be a great help, many thanks :)
Yes! Many thanks!
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Re: GS450H Discussion

Post by RE3Rotor »

slow67 wrote: Fri Mar 27, 2020 7:15 pm
Maybe you could tap into the wires into the trans and see the the status of the solenoids and the pressure switches? Maybe figure out the frequency of the SP Solenoid?


Image
Do you happen to have the diagram of where the HV ECU is and which connector has the 5(PB3), 6(PB2), and 7(PB1) wires I need to tap into? I just took a quick look in between work and kids so I didn't want to take the whole dash apart.

Behind the glovebox
Image

Beside the kick panel
Image
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Re: GS450H Discussion

Post by xp677 »

It's in the engine bay, just in front of the LH shock tower. Might be on the other side for LHD market but I don't think so.

Image

Those wires are on connector B as shown in the wiring diagram. That is shown as E77 here. Again, LHD may be different, doesn't look like it for these wires from the diagram though.

Image

Code: Select all

Symbols
(Terminal No.)
Wiring Color
Terminal Description
Condition
Standard Voltage
OPST (A55-2) - E1 (A55-18)
BR - W-B
Oil pump motor
Power switch on (IG) to on (READY)
Pulse generation
(Waveform 1)
OPM1 (A55-3) - E1 (A55-18)
B - W-B
Oil pump motor
Power switch on (READY)
Pulse generation
(Waveform 2)
SMRP (A55-17) - E1 (A55-18)
V - W-B
System main relay
Power switch on (IG) to on (READY)
Pulse generation
(Waveform 3)
BATT (A55-20) - E1 (A55-18)
L - W-B
Constant power source
Always
10 to 14
MREL (A55-21) - E1 (A55-18)
G - W-B
Main relay
Power switch on (IG)
10 to 14
ST2 (A55-22) - E1 (A55-18)
Y-B - W-B
Starter signal
Power switch on (IG)
0 to 1.5
IMI (A55-24) - E1 (A55-18)
LG - W-B
Immobilizer communication
Immobilizer communicating
Pulse generation
(Waveform 4)
IMO (A55-25) - E1 (A55-18)
W-R -W-B
Immobilizer communication
Immobilizer communicating
Pulse generation
(Waveform 4)
ILKI (A55-40) - E1 (A55-18)
W-B - W-B
Interlock switch
Power switch on (IG), inverter cover and service plug grip installed correctly
0 to 1.5
ILKI (A55-40) - E1 (A55-18)
W-B - W-B
Interlock switch
Power switch on (IG), inverter cover and service plug grip detached
10 to14
SMRB (A55-41) - E1 (A55-18)
W - W-B
System main relay
Power switch off to on (READY)
Pulse generation
(Waveform 3)
CANL (A55-42) - E1 (A55-18)
B - W-B
CAN communication system
Power switch on (IG)
Pulse generation
(Waveform 5)
CANH (A55-43) - E1 (A55-18)
W - W-B
CAN communication system
Power switch on (IG)
Pulse generation
(Waveform 5)
CAN- (A55-44) - E1 (A55-18)
B -W-B
CAN communication system
Power switch on (IG)
Pulse generation
(Waveform 6)
CAN+ (A55-45) - E1 (A55-18)
W -W-B
CAN communication system
Power switch on (IG)
Pulse generation
(Waveform 6)
+B (A55-46) - E1 (A55-18)
B-R - W-B
Power source
Power switch on (IG)
10 to14
SFTD (A55-47) - E1 (A55-18)
V - W-B
Transmission Control Switch
Power switch on (IG), shift lever in S position
10 to14
SFTD (A55-47) - E1 (A55-18)
V - W-B
Transmission Control Switch
Power switch on (IG), shift lever in negative (-) side
0 to 1.5
SFTU (A55-48) - E1 (A55-18)
Y-R - W-B
Transmission Control Switch
Power switch on (IG), shift lever in S position
10 to14
SFTU (A55-48) - E1 (A55-18)
Y-R - W-B
Transmission Control Switch
Power switch on (IG), shift lever in positive (+) side
0 to 1.5
M (A55-49) - E1 (A55-18)
W-G - W-B
Transmission Control Switch
Power switch on (IG), shift lever in S position
10 to14
M (A55-49) - E1 (A55-18)
W-G - W-B
Transmission Control Switch
Power switch on (IG), shift lever in except S position
0 to 1.5
GI (A55-52) - E1 (A55-18)
W - W-B
Camshaft position signal
Power switch on (READY), engine started
Pulse generation
(Waveform 7)
NEI (A55-53) - E1 (A55-18)
B - W-B
Crankshaft position signal
Power switch on (READY), engine started
Pulse generation
(Waveform 8)
SPDI (A55-54) - E1 (A55-18)
V - W-B
Vehicle speed signal
Approximately 20 km/h (12 mph)
Pulse generation
(Waveform 9)
NODD (A55-55) - E1 (A55-18)
GR - W-B
DC/DC operation
Converter operating normally
5 to 7
NODD (A55-55) - E1 (A55-18)
GR - W-B
DC/DC operation
Converter not operating normally
2 to 4
NODD (A55-55) - E1 (A55-18)
GR - W-B
DC/DC operation
Power switch on (IG)
0.1 to 0.5
VLO (A55-56) - E1 (A55-18)
L - W-B
DC/DC operation monitor / voltage change signal
Power switch on (IG)
Pulse generation
(Waveform 10)
SIO (A55-57) - E1 (A55-18)
Y - W-B
HV battery blower fan
Power switch on (IG), during active test
Pulse generation
(Waveform 11)
OPM2 (A55-58) - E1 (A55-18)
L-B - W-B
Oil pump motor
Power switch on (IG)
10 to 14
IWP (A55-61) - E1 (A55-18)
Y - W-B
HV water pump signal
Power switch on (READY)
Pulse generation
(Waveform 12)
TC (A55-63) - E1 (A55-18)
G-Y - W-B
Diagnosis terminal
Power switch on (IG)
10 to 14
VCP2 (A55-64) - E1 (A55-18)
B - W-B
Accelerator pedal position sensor power source (for VPA2)
Power switch on (IG)
4.5 to 5.5
VCP1 (A55-65) - E1 (A55-18)
G - W-B
Accelerator pedal position sensor power source (for VPA1)
Power switch on (IG)
4.5 to 5.5
ST1- (A55-70) - E1 (A55-18)
G-W - W-B
Brake cancel switch
Power switch on (IG), brake pedal depressed
0 to 1.5
ST1- (A55-70) - E1 (A55-18)
G-W - W-B
Brake cancel switch
Power switch on (IG), brake pedal released
10 to 14
HSDN (A55-73) - E1 (A55-18)
B - W-B
MG shutdown signal
Power switch on (READY)
0 to 1.5
PMET (A55-78) - E1 (A55-18)
L - W-B
Power meter signal
Power switch on (IG)
Pulse generation
(Waveform 13)
SMRG (A55-81) - E1 (A55-18)
L - W-B
System main relay
Power switch on (IG) to on (READY)
Pulse generation
(Waveform 3)
HTM- (A55-82) - E1 (A55-18)
W - W-B
Communication system HV to MG
Power switch on (READY)
Pulse generation
(Waveform 14)
MTH- (A55-83) - E1 (A55-18)
W - W-B
Communication from MG to HV
Power switch on (READY)
Pulse generation
(Waveform 15)
CLK- (A55-84) - E1 (A55-18)
W - W-B
MG communication clock signal
Power switch on (READY)
Pulse generation
(Waveform 16)
REQ- (A55-85) - E1 (A55-18)
W - W-B
MG communication request signal
Power switch on (READY)
Pulse generation
(Waveform 17)
IGSW (A55-86) - E1 (A55-18)
B-W - W-B
IG signal
Power switch on (IG)
10 to 14
BTH+ (A55-91) - E1 (A55-18)
B - W-B
Communication from battery to HV
Power switch on (IG)
Pulse generation
(Waveform 18)
ABFS (A55-96) - E1 (A55-18)
B - W-B
Airbag activation signal
Power switch on (READY) (2 seconds after ACC ON)
Pulse generation
(Waveform 19)
HTM+ (A55-105) - E1 (A55-18)
B - W-B
Communication system HV to MG
Power switch on (READY)
Pulse generation
(Waveform 14)
MTH+ (A55-106) - E1 (A55-18)
B - W-B
Communication system MG to HV
Power switch on (READY)
Pulse generation
(Waveform 15)
CLK+ (A55-107) - E1 (A55-18)
B - W-B
MG communication clock signal
Power switch on (READY)
Pulse generation
(Waveform 16)
REQ+ (A55-108) - E1 (A55-18)
B - W-B
MG communication request signal
Power switch on (READY)
Pulse generation
(Waveform 17)
WP (A55-109) - E1 (A55-18)
G-Y - W-B
A/C WP relay signal
Power switch on (READY)
Below 2
VPA2 (A55-110) - E1 (A55-18)
R - W-B
Accelerator pedal position sensor (for accelerator pedal position detection)
Power switch on (IG), accelerator pedal released
1.0 to 2.2
VPA2 (A55-110) - E1 (A55-18)
R - W-B
Accelerator pedal position sensor (for accelerator pedal position detection)
Power switch on (IG), engine stopped, shift lever in P position, accelerator pedal fully depressed
3.4 to 5.3
VPA (A55-111) - E1 (A55-18)
L - W-B
Accelerator pedal position sensor (for accelerator pedal position detection)
Power switch on (IG), accelerator pedal released
0.4 to 1.4
VPA (A55-111) - E1 (A55-18)
L - W-B
Accelerator pedal position sensor (for accelerator pedal position detection)
Power switch on (IG), engine stopped, shift lever in P position, accelerator pedal fully depressed
2.6 to 4.5
STP (A55-112) - E1 (A55-18)
R-B - W-B
Stop light switch
Brake pedal depressed
10 to 14
STP (A55-112) - E1 (A55-18)
R-B - W-B
Stop light switch
Brake pedal released
0 to 1.5
BTH- (A55-114) - E1 (A55-18)
W - W-B
Communication from battery to HV
Power switch on (IG)
Pulse generation
(Waveform 18)
THB (A55-115) - E2 (E77-54)
L - W-B
Auxiliary battery temperature sensor signal
Auxiliary battery temperature 25°C (77°F)
1.8 to 2.5
THB (A55-115) - E2 (E77-54)
L - W-B
Auxiliary battery temperature sensor signal
Auxiliary battery temperature 60°C (140°F)
0.7 to 1.3
RDY (A55-117) - E1 (A55-18)
W-L - W-B
READY state
Power switch on (IG) to on (READY)
Pulse generation
(Waveform 20)
SP (E77-1) - E1 (A55-18)
G - W-B
SP solenoid valve signal
During active test
10 to 14
SL1- (E77-2) - SL1+ (E77-3)
L - Y
SL1 solenoid valve signal
During active test
Pulse generation
(Waveform 21)
+BS (E77-4) - E1 (A55-18)
W - W-B
Park / Neutral position switch power source
Power switch on (IG)
10 to 14
PB3 (E77-5) - E1 (A55-18)
G - W-B
Pressure switch 3
Power switch on (READY)
10 to 14
PB2 (E77-6) - E1 (A55-18)
G-W - W-B
Pressure switch 2
Power switch on (READY)
10 to 14
PB1 (E77-7) - E1 (A55-18)
G-R - W-B
Pressure switch 1
Power switch on (READY)
10 to 14
STB (E77-8) - E1 (A55-18)
B - W-B
A/C communication signal
Power switch on (READY), air conditioning system stop
Pulse generation
(Waveform 22)
CLK (E77-9) - E1 (A55-18)
G - W-B
A/C communication signal
Power switch on (READY), air conditioning system stop
Pulse generation
(Waveform 22)
ITE (E77-10) - E1 (A55-18)
W - W-B
A/C communication signal
Power switch on (READY), air conditioning system stop
Pulse generation
(Waveform 22)
ETI (E77-11) - E1 (A55-18)
Y - W-B
A/C communication signal
Power switch on (READY), air conditioning system stop
Pulse generation
(Waveform 22)
MJ (E77-12) - E1 (A55-18)
B - W-B
Park / Neutral position switch signal
Power switch on (IG), shift lever in P, R, N or D position
10 to 14
FD (E77-13) - E1 (A55-18)
L-Y - W-B
Park / Neutral position switch signal
Power switch on (IG), shift lever in D position
10 to 14
FD (E77-13) - E1 (A55-18)
L-Y - W-B
Park / Neutral position switch signal
Power switch on (IG), shift lever in except D position
0 to 1.5
RV (E77-14) - E1 (A55-18)
G-Y - W-B
Park / Neutral position switch signal
Power switch on (IG), shift lever in R position
10 to 14
RV (E77-14) - E1 (A55-18)
G-Y - W-B
Park / Neutral position switch signal
Power switch on (IG), shift lever in except R position
0 to 1.5
D (E77-16) - E1 (A55-18)
Y - W-B
Park / Neutral position switch signal
Power switch on (IG), shift lever in D position
10 to 14
D (E77-16) - E1 (A55-18)
Y - W-B
Park / Neutral position switch signal
Power switch on (IG), shift lever in except D position
0 to 1.5
N (E77-17) - E1 (A55-18)
R - W-B
Park / Neutral position switch signal
Power switch on (IG), shift lever in N position
10 to 14
N (E77-17) - E1 (A55-18)
R - W-B
Park / Neutral position switch signal
Power switch on (IG), shift lever in except N position
1.5 to 3.0
R (E77-18) - E1 (A55-18)
L - W-B
Park / Neutral position switch signal
Power switch on (IG), shift lever in R position
10 to 14
R (E77-18) - E1 (A55-18)
L - W-B
Park / Neutral position switch signal
Power switch on (IG), shift lever in except R position
0 to 1.5
P (E77-19) - E1 (A55-18)
G - W-B
Park / Neutral position switch signal
Power switch on (IG), shift lever in P position
10 to 14
P (E77-19) - E1 (A55-18)
G - W-B
Park / Neutral position switch signal
Power switch on (IG), shift lever in except P position
0 to 1.5
SL2- (E77-21) - SL2+ (E77-22)
W - L-W
SL2 solenoid valve signal
During active test
Pulse generation
(Waveform 23)
FCTL (E77-41) - E1 (E54-18)
BR - W-B
Cooling fan relay
Power switch on (IG)
10 to 14
SP2- (E77-48) - SP2+ (E77-49)
Y - L
Transmission revolution sensor signal
Driving at approximately 55 km/h (34 mph) with power switch on (READY)
Pulse generation
(Waveform 24)
TOPM (E77-53) -E2 (E77-54)
R - W-B
Oil pump motor temperature sensor
Power switch on (IG), ambient temperature 25°C (77°F)
2.4 to 3.1
THO (E77-55) - E2 (E77-54)
G-Y - W-B
Transmission fluid temperature sensor
Power switch on (IG), ambient temperature 25°C (77°F)
2.2 to 2.8
MMT (E77-57) - MMTG (E77-58)
G - GR
Motor temperature sensor
Power switch on (IG), ambient temperature 25°C (77°F)
1.9 to 2.8
MMT (E77-57) - MMTG (E77-58)
G - GR
Motor temperature sensor
Power switch on (IG), ambient temperature 60°C (140°F)
1.1 to 1.8
GMT (E77-59) - GMTG (E77-60)
L - R
Generator temperature sensor
Power switch on (IG), ambient temperature 25°C (77°F)
1.9 to 2.8
GMT (E77-59) - GMTG (E77-60)
L - R
Generator temperature sensor
Power switch on (IG), ambient temperature 60°C (140°F)
1.1 to 1.8
Sorry, the table didn't come out very well. I've attached it as a CSV as well which you can import in to a spreadsheet program, or read "well enough" in notepad.

The bit you care about is:

PB3 (E77-5) - E1 (A55-18)
G - W-B
Pressure switch 3
Power switch on (READY)
10 to 14

PB2 (E77-6) - E1 (A55-18)
G-W - W-B
Pressure switch 2
Power switch on (READY)
10 to 14

PB1 (E77-7) - E1 (A55-18)
G-R - W-B
Pressure switch 1
Power switch on (READY)
10 to 14
Attachments
gs450h hvecu.csv
(11.52 KiB) Downloaded 154 times
RE3Rotor
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Re: GS450H Discussion

Post by RE3Rotor »

Thank you. I'm assuming I'm looking for 10-14v when the switches are activated?
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Re: GS450H Discussion

Post by slow67 »

The pressure switches will probably be +12V when not pressurized and grounded when pressurized. Same with the solendoids, most likely +12v when not active, and grounded when activated. SP will most likely be pulsed.
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Re: GS450H Discussion

Post by xp677 »

RE3Rotor wrote: Wed Apr 01, 2020 7:24 pm Thank you. I'm assuming I'm looking for 10-14v when the switches are activated?
The 10-14v reading is taken when the car is"Power switch on (READY)". It doesn't say any more than that.

This information is outside what you originally asked for, and likely falls outside the scope of your current project, so I would ignore it. Likely the 10-14v is from an input pullup within the HVECU, and what you really want to be looking for is resistance to ground on those pins.
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Re: GS450H Discussion

Post by RE3Rotor »

I was able to locate and access the connector. I was trying to push a solid core wire through the weather seal on the back side of the connector. Is this the best approach to tap into the signal?
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Re: GS450H Discussion

Post by slow67 »

RE3Rotor wrote: Thu Apr 02, 2020 5:26 pm I was able to locate and access the connector. I was trying to push a solid core wire through the weather seal on the back side of the connector. Is this the best approach to tap into the signal?
I'm not sure, I don't know what the connector looks like on that module.
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Re: GS450H Discussion

Post by Kevin Sharpe »

RE3Rotor wrote: Thu Apr 02, 2020 5:26 pm I was able to locate and access the connector. I was trying to push a solid core wire through the weather seal on the back side of the connector. Is this the best approach to tap into the signal?
I would recommend a wire tap product... Posi-Tap are excellent and can be left in place and waterproofed with a blob of sealant when you're finished.

https://www.posi-products.com/posiplug.html
This is a personal post and I disclaim all responsibility for any loss or damage which any person may suffer from reliance on the information and material in this post or any opinion, conclusion or recommendation in the information and material.
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Re: GS450H Discussion

Post by xp677 »

Use wire taps. Even the cheap "t tap" works fine. Or in a pinch, slit the insulation and solder a wire to it (not recommended, but that's how I did the original GS450h data stream!)
RE3Rotor
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Re: GS450H Discussion

Post by RE3Rotor »

slow67 wrote: Thu Apr 02, 2020 6:37 pm I'm not sure, I don't know what the connector looks like on that module.
It is similar to this on the back side. Image
Kevin Sharpe wrote: Thu Apr 02, 2020 6:52 pm
I would recommend a wire tap product... Posi-Tap are excellent and can be left in place and waterproofed with a blob of sealant when you're finished.

https://www.posi-products.com/posiplug.html
Thanks, I will see if I can find it in my local auto-parts store.
slow67
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Re: GS450H Discussion

Post by slow67 »

Ok I think I have some data on the pressure switches and the shift solenoids.

With no pressure anywhere, they are all closed. When oil pressure is sufficient, PB3 opens.
When Low gear is commanded, PB2 switch is opened when pressure is applied (and PB1 remains closed).
When High gear is commanded (during the shift), both PB1 and PB2 close momentarily.
Then when the shift is completed PB1 Opens.

Setting both solenoids Low will get low gear, setting both high will get high gear.
xp677
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Re: GS450H Discussion

Post by xp677 »

When writing code for this, don't forget to set your MG1 and MG2 torque to zero before the shift, and then ramp this back up (don't reapply it all instantly) once the shift is complete.

I'd recommend doing the shifts at around 5000rpm for MG1, so I'd try upshift at 6000 and downshift at 4000. Ratios are 1.9 and 3.9 so this will keep MG1 within 12000rpm.

If SP is purely a line pressure solenoid, then likely this can be ignored, and the pressure controlled with the oil pump speed instead. Or maybe a combination of the two for fine control.

It might be worth looking at what SP does during shifts, likely pressure will be momentarily increased during a shift. Maybe this is a use for SP. I noticed the oil pump controller is a bit slow to react to changing speeds.
slow67
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Re: GS450H Discussion

Post by slow67 »

xp677 wrote: Fri Apr 03, 2020 10:29 am When writing code for this, don't forget to set your MG1 and MG2 torque to zero before the shift, and then ramp this back up (don't reapply it all instantly) once the shift is complete.

I'd recommend doing the shifts at around 5000rpm for MG1, so I'd try upshift at 6000 and downshift at 4000. Ratios are 1.9 and 3.9 so this will keep MG1 within 12000rpm.

If SP is purely a line pressure solenoid, then likely this can be ignored, and the pressure controlled with the oil pump speed instead. Or maybe a combination of the two for fine control.

It might be worth looking at what SP does during shifts, likely pressure will be momentarily increased during a shift. Maybe this is a use for SP. I noticed the oil pump controller is a bit slow to react to changing speeds.
You could set torque to zero during the shift, but that all depends on the capabilities of the transmission. Some transmissions (even ones that are clutch to clutch like this one) are capable of keeping torque applied during the shift. I'm not yet certain if this one is capable of it (I don't yet have it in a car, just a spinning output shaft on a bench).

MG1 rpm should be irrelevent for when to shift MG2, as MG1 rpm won't change. I plan on commanding the shift around 9500rpm to give a little overhead before hitting the rev limit of 10,230rpm. After the shift, rpm will be around 4600 MG2 rpm. I'll probably downshift somewhere around 3750 MG2 rpm when in high gear (and will spike to 7700 rpm on the downshift).

I'll try to do some testing to see if SP is a line pressure solenoid (I'll monitor PB3 and see if I can get it to close while commanding a decent oil pump PWM). I'll also see if I can find a port for line pressure to measure (and then try to find a metric adapter around here).
slow67
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Re: GS450H Discussion

Post by slow67 »

Confirmed. TransSP is a line pressure solenoid. All pressure drops out if it goes high.
Also 60 isn't enough PWM to keep enough pressure to open the switches, so I set 65 as a minimum.
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sfk
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Re: GS450H Discussion

Post by sfk »

TransSP is there to disengage the Electric Oil Pump when the mechanical oil pump is providing oil pressure (when input shaft of gearbox is spinning)?
-< Mazda Eunos JC Cosmo rotary -> EV conversion w/ Lexus GS450H gear >-
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