An engine system, comprising: an engine control system configured to: receive a first pressure signal (P 2) transmitted from a first pressure sensor disposed downstream from a throttle valve; receive a first temperature signal (T 2) transmitted from a first temperature sensor disposed downstream from the throttle valve; derive a first pressure representative of the first pressure signal; derive a first temperature representative of the first temperature signal; derive a desired air-fuel mixture flow through the throttle valve; derive a first throttle position using a model, wherein the model is configured to use the desired air-fuel mixture flow, the first pressure (P 2), and the first temperature (T 2) as model input; derive a second throttle position using a map; compare the first throttle position to the second throttle position; and apply the first throttle position to control the throttle valve when the first throttle position and the second throttle position are within one or more calibrated thresholds, wherein the engine control system comprises an engine control unit, and wherein the ECU is configured to: receive a second pressure signal (P 1) transmitted from a second pressure sensor disposed upstream from the throttle valve; receive a second temperature signal (T 1) transmitted from a second temperature sensor disposed upstream from the throttle valve; derive a second pressure (P 1) representative of the second pressure signal; and derive a second temperature (T 1) representative of the second temperature signal, wherein the model is configured to use the first and the second pressure (P 1,P 2) and the first and the second temperature (T 1,T 2) as model input to derive the first throttle position, and wherein the map comprises a lookup table that maps a desired engine torque and an engine speed to the second throttle position. receive a first pressure signal (P 2) transmitted from a first pressure sensor disposed downstream from a throttle valve; receive a first temperature signal (T 2) transmitted from a first temperature sensor disposed downstream from the throttle valve; derive a first pressure representative of the first pressure signal; derive a first temperature representative of the first temperature signal; derive a desired air-fuel mixture flow through the throttle valve; derive a first throttle position using a model, wherein the model is configured to use the desired air-fuel mixture flow, the first pressure (P 2), and the first temperature (T 2) as model input; derive a second throttle position using a map; compare the first throttle position to the second throttle position; and apply the first throttle position to control the throttle valve when the first throttle position and the second throttle position are within one or more calibrated thresholds, receive a second pressure signal (P 1) transmitted from a second pressure sensor disposed upstream from the throttle valve; receive a second temperature signal (T 1) transmitted from a second temperature sensor disposed upstream from the throttle valve; derive a second pressure (P 1) representative of the second pressure signal; and derive a second temperature (T 1) representative of the second temperature signal, wherein the model is configured to use the first and the second pressure (P 1,P 2) and the first and the second temperature (T 1,T 2) as model input to derive the first throttle position,