Figure 3.

Realization of the internal reference model as a second order relaxation oscillator. Equations that implement the model were used to simulate BP and HR. The model parameters were chosen as:h0 = −40.0, h1 = 19.5, h2 = 35.6, h3 = 46.15, h4 = 140, h5 = −61.4, h6 = −0.05, bias = 30, g0 = −88.05, g1 = −18.5, g2 = 0.9, g3 = 0.1, S = −700, T = −40. The nonlinear function, NL, operated on the derivative of x₂ to generate the output reference signal for controlling the vasculature that controls BP. See text for model equations and detailed description.