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# Guide to Tuning the ETB and VVT PIDs
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Let's discuss the ETB and VVT PID controls and some give techniques for tuning these loops.
$$
u(t) = K_\text{p} e(t) + K_\text{i} \int_0^t e(\tau) \,\mathrm{d}\tau + K_\text{d} \frac{\mathrm{d}e(t)}{\mathrm{d}t}
$$
## More Details
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Wikipedia's PID Controller page's [operational description ](https://en.wikipedia.org/wiki/PID_controller#Fundamental_operation ).
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More details about ETB PID control are found in the Advanced Features section's page [ETB PID and Autotune ](/07-Advanced-Features/ETB/ETB-PID.md ).
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More details about VVT PID control are found in the Advanced Features section's page [VVT PID Control ](/07-Advanced-Features/Variable-Cam-Timing/VVT-PID.md ).