Toyota 86 DI duty cycle vs PI calculation

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For FA20D Direct Injection Injector duty cycle, are they calculate differently than port injector (secondary) since Direct injector injection timing are likely limited to 360 BTDC.

Thanks,

Brian

[Stephen Dean]

Hi Brian,

Essentially the DC on a DI engine being run by an M1 changes based on available injection time, and the Actual Pulse Width at one load site will not relate to the Actual Pulse Width at another load site, even if they have the same DC.

From the M1 Help

Current fuel injector duty cycle as the ratio of the injection angle related to the maximum available injection angle.

The injection angle is calculated from:
•The maximum of Fuel Cylinder N Primary Output Pulse Width 1
•Engine Speed
The maximum available angle for an injection ensues as the difference between Fuel Timing Primary and Fuel Timing Primary Limit.

If the duty cycle comes near 100% this means the whole span between Fuel Timing Primary and Fuel Timing Primary Limit is needed to deliver the fuel. To avoid truncation of the injection, either Fuel Timing Primary or Fuel Timing Primary Limit can be extended to allow for a longer injection, however this must be done with care to not exceed physical limitations of the engine. Apart from using injectors with a higher flow rate also a higher fuel pressure can shorten the injection itself.

In transient conditions this value can be significantly higher than in constant conditions due to temporary compensation of fuel film effects.

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SDean,

Thanks for quick response.

Also other question regarding this package is if GPR-P package can be add this 86 package in future?

Thanks,

Brian

[Stephen Dean]

Hi Brian,

There is a Toyota 86 P/S package that is going through Beta testing at the moment.

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Now, we have 86 ECU kit with C127 display kit. Mainly we going to have ECU do all the datalogging either end have GPS input. How should we have it setup with GPS beacon and have ECU datalogging for driver performance and lap timing?

I don't recall there is GPS beacon sw input on ECU side.

Thanks,

Brian

[Stephen Dean]

Hi Brian,

I have attached the CAN Comm templates for transmitting GPS to the M1 over CAN, you need to setup the M1 in the following manner, just check to make sure that the CAN addresses match in both devices.

GPS decode.JPG (14.65 KiB) Viewed 24105 times

This setting will generate laptimes in the M1, the GPS co-ordinates for all of the main tracks (same as in the Dash) is loaded into the build.

gps laptime.JPG (19.46 KiB) Viewed 24105 times

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On MY FT86 Package, Under GPS doesn't have Interface and CAN ID Setting, as well as Under LAP there are no options on GPS.

Thanks,