Spedy Posted February 29, 2020 Report Share Posted February 29, 2020 Good afternoon, help me figure out why the speed does not work with 0. car toyota supra jza80 1996 usa. Speed taken with abs sensors speed from 0.llg 09.09.18 supra for link forum.pclr Quote Link to comment Share on other sites More sharing options...
Adamw Posted February 29, 2020 Report Share Posted February 29, 2020 The plug-in ECU digital inputs are quoted as being capable of 500Hz max frequency, in your log you are up at around 1600Hz when the rear wheel speed starts to drop out. ABS sensors typically have too many teeth for the plug-in ecu digital inputs. If you are not using ABS you could possibly grind off half the teeth, or you can make/buy a small frequency divider. Quote Link to comment Share on other sites More sharing options...
Spedy Posted April 15, 2020 Author Report Share Posted April 15, 2020 On 29.02.2020 at 23:58, Adamw said: Цифровые входы подключаемого блока ECU указаны для максимальной частоты 500 Гц, в вашем журнале вы работаете на частоте около 1600 Гц, когда скорость заднего колеса начинает падать. Датчики ABS обычно имеют слишком много зубцов для вставных цифровых входов ecu. Если вы не используете ABS, вы можете отшлифовать половину зуба, или вы можете сделать / купить небольшой делитель частоты. 1. It's not about the peak of the graph, but about the beginning and end. The problem is that my ecu does not see speed from 0 mph. 2. I found DI 11 in the firmware, but no DI 11 in the pinout. Where to look for him? Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 15, 2020 Report Share Posted April 15, 2020 Reluctor sensors will not work down to 0MPH, they will stop working at low speeds when the voltage output is less than about 1V. DI11 is not connected on the Supra ECU. Quote Link to comment Share on other sites More sharing options...
Spedy Posted April 15, 2020 Author Report Share Posted April 15, 2020 24 minutes ago, Adamw said: Reluctor sensors will not work down to 0MPH, they will stop working at low speeds when the voltage output is less than about 1V. DI11 is not connected on the Supra ECU. tell me where else can I get signals from abs sensors to track the speed of the front axle. I need this for traction control Quote Link to comment Share on other sites More sharing options...
Adamw Posted April 16, 2020 Report Share Posted April 16, 2020 You may get slightly lower speed range if you tap into the onditioned signal that comes out of the ABS unit. However I suspect even the OEM ABS doesnot work below about 10kmh. In your log it looks like the wheel speeds are reliable down to about 20kmh, do you really need traction control to work at that speed? Usually you would set the speed lockout above 25kmh as TC is not much use at low speeds where you need very high slip. You can find conditioned wheel speeds here: Quote Link to comment Share on other sites More sharing options...
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