Patent ID: 8428849

Claim:
An engine control method comprising: obtaining a setting value of a fuel injection quantity for an engine having an exhaust gas recirculator (EGR) and a variable nozzle turbo (VNT), a setting value of an engine speed, a measurement value of a manifold air pressure (MAP) of the engine and a measurement value of a mass air flow (MAF) of the engine; and controlling a MAF control system of the engine, a MAP control system of the engine, a first interference compensation system from the MAF control system to the MAP control system and a second interference compensation system from the MAP control system to the MAF control system according to a combination of a reference value of an EGR valve opening degree and a reference value of a VNT nozzle opening degree, which correspond to the setting value of the fuel injection quantity and the setting value of the engine speed or a combination of a control value of the EGR valve opening degree by the MAF control system, which corresponds to the measurement value of the MAF, and a control value of the VNT nozzle opening degree by the MAP control system, which corresponds to the measurement value of the MAP, and wherein the controlling comprises: upon detecting that both of a first condition and a second condition are not satisfied, enabling the MAP control system, the MAP control system, the first interference compensation system and the second interference compensation system, wherein the first condition is a condition that the reference value or the control value of the EGR valve opening degree is within a range considered as being completely closed or completely opened, and the second condition is a condition that the reference value or the control value of the VNT nozzle opening degree is within a range considered as being completely closed or completely opened; upon detecting that the first condition is satisfied and the second condition is not satisfied, disabling the MAF control system, the first interference compensation system and the second interference compensation system or adjusting outputs of the MAF control system, the first interference compensation system and the second interference compensation system, and enabling the MAP control system; and upon detecting that the second condition is satisfied and the first condition is not satisfied, disabling the MAP control system, the first interference compensation system and the second interference compensation system or adjusting outputs of the MAP control system, the first interference compensation system and the second interference compensation system, and enabling the MAF control system.