Difference between revisions of "Porsche 928 LH Replacement Rev 2"
From Francois Louw
(→To Do list) |
|||
| Line 1: | Line 1: | ||
<metadesc>LH Replacement ECU Revision 2</metadesc> | <metadesc>LH Replacement ECU Revision 2</metadesc> | ||
<metakeywords>Porsche,928,S4,LH,Replacement,ECU,Fuel computer,LH ECU,fuel injection,replacement,replace,fix,bosch lh,bosch,bosch ecu,engine control unit,electronic control unit,porsche ecu repair,jetronic,lh jetronic,porsche lh jetronic,ecu replacement,porsche 928 lh ecu,928 ecu repair,lh replacement,porsche 928,repair ecu,ecu replacement,bosch lh jetronic,928 porsche,porsche ecu rebuild,porsche ecu repair,porsche ecu replace,gt,gts,928 s4,928 gt,928 gts,928 s2,35 pin,25 pin,fuel map,performance,engine control,lh-jetronic,l-jetronic,module repair,module rebuild,ECU repair,ECU rebuild,ECM,EZK repair, EZF repair, fuel injection, Mass Airflow Meter repair, MAF, MAF calibration, Porsche repair, lh test, ECU test, MAF test, LH 2.0, LH 2.2, LH 2.3,MAF, Mass Air Flow Meter, Porsche 928, ECU, Porsche Hammer, ECU Repair, SharkTuner,Fault Find,Fault Diagnosis</metakeywords> | <metakeywords>Porsche,928,S4,LH,Replacement,ECU,Fuel computer,LH ECU,fuel injection,replacement,replace,fix,bosch lh,bosch,bosch ecu,engine control unit,electronic control unit,porsche ecu repair,jetronic,lh jetronic,porsche lh jetronic,ecu replacement,porsche 928 lh ecu,928 ecu repair,lh replacement,porsche 928,repair ecu,ecu replacement,bosch lh jetronic,928 porsche,porsche ecu rebuild,porsche ecu repair,porsche ecu replace,gt,gts,928 s4,928 gt,928 gts,928 s2,35 pin,25 pin,fuel map,performance,engine control,lh-jetronic,l-jetronic,module repair,module rebuild,ECU repair,ECU rebuild,ECM,EZK repair, EZF repair, fuel injection, Mass Airflow Meter repair, MAF, MAF calibration, Porsche repair, lh test, ECU test, MAF test, LH 2.0, LH 2.2, LH 2.3,MAF, Mass Air Flow Meter, Porsche 928, ECU, Porsche Hammer, ECU Repair, SharkTuner,Fault Find,Fault Diagnosis</metakeywords> | ||
| − | + | ||
| + | '''Porsche 928 LH Replacement Revisoin 2 Build Page''' | ||
| + | |||
[[Porsche 928 LH Replacement ECU|Back to Project Page]] | [[Porsche 928 LH Replacement ECU|Back to Project Page]] | ||
| Line 17: | Line 19: | ||
I will mark what is done as I complete it. | I will mark what is done as I complete it. | ||
| − | *Remove LM317 and remove intermediate voltage level | + | *''Remove LM317 and remove intermediate voltage level'' |
| − | *Fix power supply to op-amps | + | *''Fix power supply to op-amps'' |
| − | *Add buffering to analog input signals | + | *''Add buffering to analog input signals'' |
| − | *Add more filtering to input analog signals | + | *''Add more filtering to input analog signals'' |
| − | *Use a divide by 15 * multiply by 3.3 to ensure the input analog signal at CPU pin does not exceed 3.3V | + | *''Use a divide by 15 * multiply by 3.3 to ensure the input analog signal at CPU pin does not exceed 3.3V'' |
| − | *Fix USB power line | + | *''Fix USB power line'' |
| − | *Replace USB connector | + | *''Replace USB connector'' |
| − | *Make board smaller | + | *''Make board smaller'' |
*Add 25-pin connector support | *Add 25-pin connector support | ||
*Add aftermarket connector support | *Add aftermarket connector support | ||
| − | *Add more diagnostic LEDs | + | *''Add more diagnostic LEDs'' |
| − | *Remove serial | + | *''Remove serial line'' |
| − | *Add extra digital and analog inputs for engine mods | + | *''Add extra digital and analog inputs for engine mods'' |
*Add I2C/SPI interface for future expansion | *Add I2C/SPI interface for future expansion | ||
| − | *Add battery voltage analog line | + | *''Add battery voltage analog line'' |
| − | *Remove external EEPROM lines | + | *''Remove external EEPROM lines'' |
| − | *Add header for bootloader | + | *''Add header for bootloader'' |
| − | *Improve Silkscreen labels | + | *''Improve Silkscreen labels'' |
| − | *Optimise layout for faster component placing | + | *''Optimise layout for faster component placing'' |
| − | *Add pull-up resistors to TTL signals (EZK Load and Warning Light) | + | *''Add pull-up resistors to TTL signals (EZK Load and Warning Light)'' |
| − | *Fix protection diodes | + | *''Fix protection diodes'' |
| − | *Add MAF-Burn function at engine shutdown | + | *''Add MAF-Burn function at engine shutdown'' |
*Add test-points | *Add test-points | ||
*Add mounting holes | *Add mounting holes | ||
| − | *Change to switching power supply | + | *''Change to switching power supply'' |
| − | *Change to surface mount protection diodes | + | *''Change to surface mount protection diodes'' |
| − | *Redo FET driver circuitry | + | *''Redo FET driver circuitry'' |
| + | |||
| + | ==Updates done so far 2 April 2013== | ||
| + | |||
| + | SO far I have done major reworking to the second revision of the PCB. All the changes that has been made are marked on the to do list. | ||
| + | |||
| + | Most of the to do list is done. Here are a bit more detail on some of the changes that has been made. | ||
| + | |||
| + | '''3.3V supply''': The supply to the processor has been changed to use a switching supply. The main reason for this change was that the intermediate voltage level of around 8V was no longer used, meaning that using a linear supply to drop straight from 12V to 3.3 was not practical. A simple TI switching circuit is now used. | ||
| + | |||
| + | '''Analog Inputs''': The analog signals has been completely changed and cleaned up. Now there is proper filtering, and the input voltages are managed better allowing better use of the A/D Converter. The changes mainly result from dividing the input voltages by 15 and then multiplying up to a maximum of 3.3V. This will yield more accurate sampling. | ||
| + | |||
| + | '''FET Drivers''': The FET driving circuitry has been optimised. Previosuly a simple NPN transistor was used to pull down the Gate of the FET. Now a proper NPN-PNP pair is used. This results in slightly more ucrrent being drawn, but will yield less heat. The previous circuit heated up the pull up resistors quite a bit. | ||
| + | |||
| + | '''MAF Burn''': The MAF burn has been fixed. Now when the MAF burn signal is sent, the MAF burn will only happen after engine has been shut down. The prototype revision was not able to do this, resulting in no MAF burn feature. | ||
| + | |||
| + | '''Other Changes''': the other changes are general and upon request I can explain in more detail what was done. | ||
| + | |||
| + | After more testing with prototypes I will make a batch of the next revision boards (around 10) and then text to make sure that there are no errors. | ||
