Internal combustion engine and control method therefor
AssigneeIsuzu Motors Limited
InventorsYoshihumi Hanamura, Mitsuhiro Aso
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Abstract
An internal combustion engine includes an Exhaust Gas Recirculation (EGR) system having an EGR valve and a reed valve in an EGR passage, and a control device that expresses a relationship between an opening degree of the EGR valve and a mass flow rate of an EGR gas by using a first volume flow rate of the EGR gas that can be expressed by using an isentropic flow equation of a nozzle of the EGR valve and a second volume flow rate of the EGR gas pumped out by the reed valve. Even if the reed valve (check valve) is provided in the EGR passage, the mass flow rate of the EGR gas can be calculated accurately.
Claims8
An internal combustion engine including an EGR system having an EGR valve and a check valve in an EGR passage, wherein, the internal combustion engine comprises:
- a control device expressing a relationship between an opening degree of the EGR valve and a mass flow rate of an EGR gas by using a first volume flow rate of the EGR gas that can be expressed by using an isentropic flow equation of a nozzle of the EGR valve and a second volume flow rate of the EGR gas pumped out by the check valve.
A control method for an internal combustion engine including an EGR system having an EGR valve and a check valve in an EGR passage, wherein
- when a mass flow rate of an EGR gas is calculated from an opening degree of the EGR valve, or when the opening degree of the EGR valve is calculated from the mass flow rate, the control method uses a first volume flow rate of the EGR gas that can be expressed by using an isentropic flow equation of a nozzle of the EGR valve and a second volume flow rate of the EGR gas pumped out by the check valve.
Dependencies are inferred from the claim text.