Internal-combustion engines – Charge forming device – Air/fuel ratio prior to combustion responsive means
Patent
1997-10-31
1999-12-14
Wolfe, Willis R.
Internal-combustion engines
Charge forming device
Air/fuel ratio prior to combustion responsive means
12356816, F02M 2507, F02D 4114
Patent
active
060003855
ABSTRACT:
A combustion engine with an EGR apparatus has an EGR path connecting an exhaust path and an intake path. An EGR control valve is mounted in the EGR path for controlling the amount of flow of an EGR gas flowing from the exhaust path to the intake path. The combustion engine also has an oxygen concentration sensor mounted downstream of a joint of the intake path and the EGR path, and in the intake path, for detecting a concentration of oxygen in an intake air. The intake air contains the EGR gas and an air introduced from an atmosphere via the intake path. The combustion engine also has converted actual EGR ratio calculating means for calculating a converted actual EGR ratio on the basis of the concentration of oxygen in the intake air detected by the sensor. The converted actual EGR ratio is a ratio of an actual EGR ratio to an actual air ratio. The actual EGR ratio is a ratio of the amount of the EGR gas to the amount of the intake air.
REFERENCES:
patent: 4168683 (1979-09-01), Hata et al.
patent: 4614175 (1986-09-01), Asayama
patent: 4727849 (1988-03-01), Nishida et al.
patent: 4794903 (1989-01-01), Suzuki
patent: 5201303 (1993-04-01), Kojima
M. Nishida, et al., "Closed Loop Control of the EGR Rate Using the Oxygen Sensor", SAE International Congress and Exposition, No. 880133, Feb. 29, 1988-Mar. 4, 1988, pp. 6, 168-6, 170, XP002105012, p. 6, 172, col. 2, line 8, p. 6, 171, col. 2, line 52, p. 6, 173, col. 2, line 12-line 26.
Toyota Jidosha & Kabushiki Kaisha
Wolfe Willis R.
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