Search found 11 matches

by Реконструктор
Thu Jul 04, 2019 1:08 pm
Forum: Dev: Software
Topic: launch control
Replies: 93
Views: 34222

Re: launch control

Well, it turns out that stm32f4discovery board already have accelerometer on it! :D So, here is even simpler design, it require some empirical data, though. Go some weekend at the drag strip and do some launches. Log the accelerometer stream. Then choose the best result you have. After that, launch ...
by Реконструктор
Thu Jul 04, 2019 8:31 am
Forum: Dev: Software
Topic: launch control
Replies: 93
Views: 34222

Re: launch control

2b requires extra sensors, external to the ECU. The "right" way to do it is by comparing the driven and undriven wheel speeds. This difference gives the amount of slip at the driven tires, which is then controlled by twiddling the power output of the engine up or down. Too much slip -> reduce power...
by Реконструктор
Thu Jul 04, 2019 8:21 am
Forum: Dev: Software
Topic: launch control
Replies: 93
Views: 34222

Re: launch control

The perfect launch occurs not where you are at max power, but on max torque. I'd like to make a clarification here: This is not how you get an ideal launch. The ideal launch is when you ride the peak of the slip % vs. grip curve for your tire for as long as possible. If I tried to launch at peak to...
by Реконструктор
Wed Jul 03, 2019 6:26 pm
Forum: Dev: Hardware
Topic: VR board
Replies: 51
Views: 10731

Re: VR board

kb1gtt wrote:
Wed Jul 03, 2019 6:13 pm
Schematic?
It was long time ago, but luckily, for some reason, my Subaru have VR sensors so I may play with it to reproduce the device once again. :)
by Реконструктор
Wed Jul 03, 2019 6:23 pm
Forum: Dev: Software
Topic: launch control
Replies: 93
Views: 34222

Re: launch control

Not sure if useful, but here is my 5 kopeek. :) The perfect launch occurs not where you are at max power, but on max torque. Which, in most engines, occurs around 4-4500 rpm. So the driver's goal is to work with the gas pedal in order to keep engine revving around it's max torque rpms. If you ever p...
by Реконструктор
Wed Jul 03, 2019 5:46 pm
Forum: Dev: Hardware
Topic: VR board
Replies: 51
Views: 10731

Re: VR board

I remember making such thing based on analog comparator with hysteresis. It was quite universal, worked with hall sensors as well.
by Реконструктор
Wed Jun 26, 2019 11:59 am
Forum: Dev: Hardware
Topic: rusEfi own wide band controller board add-on using CJ125
Replies: 352
Views: 93767

Re: rusEfi own wide band controller board add-on using CJ125

R4 is not the calibration resistor. The calibration resistor is INSIDE the lsu4.9 connector, hence why there are 5 wires from connector to sensor, but 6 pins in the connector. There are some docs here about the cj125 and LSU4.9 if you want to read more: https://github.com/rusefi/rusefi/tree/master/...
by Реконструктор
Mon Jun 24, 2019 11:33 am
Forum: Dev: Hardware
Topic: rusEfi own wide band controller board add-on using CJ125
Replies: 352
Views: 93767

Re: rusEfi own wide band controller board add-on using CJ125

I'm asking about this resistor, what is its function?
rcal.png
rcal.png (24.93 KiB) Viewed 6814 times
by Реконструктор
Sun Jun 23, 2019 8:44 am
Forum: Dev: Hardware
Topic: rusEfi own wide band controller board add-on using CJ125
Replies: 352
Views: 93767

Re: rusEfi own wide band controller board add-on using CJ125

JRD McLAREN wrote:
Sat Jun 22, 2019 1:57 am
Реконструктор wrote:
Fri Jun 21, 2019 1:16 pm
The sensors I have does not have that wire, since the calibration resistor, which is slider-type, is inside the connector, and it is factory soldered at 62 ohms.
Every one LSU sensor have they own unique calibration resistor ...
OK, why is that external resistor, then?
by Реконструктор
Fri Jun 21, 2019 1:16 pm
Forum: Dev: Hardware
Topic: rusEfi own wide band controller board add-on using CJ125
Replies: 352
Views: 93767

Re: rusEfi own wide band controller board add-on using CJ125

Hi all. This is my first post in this forum. :) My goal is to build atMega and CJ125 based stand-alone controller for WBO probe. I had collected several reference schematics across the net, including the one from rusEfi repository. All of them shows the Rcal wire (the green one) is connected to the ...