Lyndon Sharp Posted February 4, 2008 Report Share Posted February 4, 2008 Are the digital channels assigned to interrupts and how fast (in ms) can the ecu react to a state change, switch maps and would that be a consistant time frame? Lyndon. Quote Link to comment Share on other sites More sharing options...
ashesman Posted February 4, 2008 Report Share Posted February 4, 2008 When used for general purpose switching response time is less than 8ms. When used for time critical stuff like flat shifting they are interrupt driven... Quote Link to comment Share on other sites More sharing options...
ashesman Posted February 6, 2008 Report Share Posted February 6, 2008 Map switching would be done off a GP input so switching would occur within 8ms. Remember that the new tables fuel value cant be used until the next engine cycle. One engine cycle at 15000 RPM takes 8ms so as far as tuning is concerned the maps will switch immediately... Interrupt response time is in the nanoseconds range but processor data sheets will not tell you how much code has to execute and other events that must happen before the effect of your DI switch will be seen... Quote Link to comment Share on other sites More sharing options...
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