Internal-combustion engines – Intake manifold – Manifold tuning – balancing or pressure regulating means
Patent
1977-05-12
1978-09-19
Burns, Wendell E.
Internal-combustion engines
Intake manifold
Manifold tuning, balancing or pressure regulating means
123119EC, 123119D, 123124B, F02M 2304, F02M 712
Patent
active
041145780
ABSTRACT:
An air-to-fuel ratio control system, for properly supplying additional air through an additional air passage to the intake port of the internal combustion engine depending on a detected air-to-fuel ratio of the mixture, includes a drive unit having two main pressure chambers divided by a main diaphragm and an auxiliary pressure chamber separated by an auxiliary diaphragm from one of the main chambers. The main and auxiliary diaphragms are connected by a rod to a bypass valve mounted in the additional air passage to increase or decrease the passage area by the movement of the bypass valve. In response to an air-to-fuel ratio detection signal, the intake port vacuum (or the atmosphere) is introduced to either one of the main chamber while the other chamber is occupied with the atmosphere or the intake port vacuum thereby to produce a pressure difference between the two main chambers. Since the third pressure chamber is normally occupied with the intake port vacuum, the movement of the bypass valve is biased in a direction to decrease the passage area of the additional air thereby to eliminate the adverse effect of the variation in the intake port vacuum.
REFERENCES:
patent: 3866588 (1975-02-01), Nakada et al.
patent: 4010722 (1977-03-01), Laprade et al
patent: 4015568 (1977-04-01), Horiye et al.
patent: 4046120 (1977-09-01), Laprade et al.
patent: 4052968 (1977-10-01), Hattori et al.
patent: 4062337 (1977-12-01), Rivere
Hattori Tadashi
Kohama Tokio
Nakase Takamichi
Burns Wendell E.
Nippon Soken Inc.
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