| 摘要 |
PROBLEM TO BE SOLVED: To provide a throttle valve passing air flow rate calculating device, for accurately calculating a throttle valve passing air flow rate even when EGR gas is introduced. SOLUTION: In this device for calculating a throttle valve passing flow rate mt in an internal combustion engine 1 including an exhaust recirculation passage 21 for letting exhaust gas flow in an intake passage 13 and a control valve 22 for regulating the flow rate of exhaust gas passing through the exhaust recirculation passage 21, when Pm is an intake pipe internal pressure, Pmegr is an intake pipe internal pressure in steady operation, Pa is atmospheric pressure, e, d and r are compatible parameters determined on the basis of the engine rotational frequency, andΦ(Pmegr/Ps) andΦ(Pm/Pa) are coefficients respectively determined depending on the values of Pmegr/Pa and Pm/Pa, the throttle valve passing air flow rate mt is calculated according to the expression: mt = äe(Pmegr-b) + r} xΦ(Pmegr/Pa)/Φ(Pm/Pa). COPYRIGHT: (C)2004,JPO&NCIPI
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