Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1989-05-30
1990-03-06
Argenbright, Tony M.
Internal-combustion engines
Charge forming device
Fuel injection system
123489, 204401, 204410, 204412, 204425, G01N 2758, F02D 4122
Patent
active
049056522
ABSTRACT:
A device for detecting and measuring the concentration of a gas in a mixture of gas such as oxygen in the exhaust gas of an internal combustion engine and circuits for using that measurement to control the air-fuel ratio supplied to the engine. The detecting device has two separate gas residence chamber with different diffusion resistance openings for each chamber and separate pairs of electrodes for each chamber whereby the measurement can be separately made in each chamber. The particular chamber selected for measurement may be done on the basis of whether the air-fuel ratio is lean or rich whereby a substantially linear reading results for all ratios or on the basis of the transition-state or steady-state operating condition of the engine to provide either more rapid or more accurate readings. Further, by using the cells from both chambers to compare their readings and standards, the actual readings can be corrected for abnormalties that may occur after a period of use or to indicate the detector has become defective.
REFERENCES:
patent: 4121548 (1978-10-01), Hattori et al.
patent: 4158166 (1979-06-01), Isenberg
patent: 4272329 (1987-06-01), Hetrick
patent: 4272331 (1981-06-01), Hetrick
patent: 4285790 (1981-08-01), Isenberg
patent: 4547281 (1985-10-01), Wang et al.
patent: 4568443 (1986-02-01), Asayama et al.
SAE Technical Paper Series (841250), "Extended Range Air-to-Fuel Ratio Sensor", (1984).
SAE Technical Paper Series (850378), "Multi-Layered Zirconia Oxygen Sensor for Lean Burn Engine Application", (1985).
SAE Technical Paper Series (850380), "Lean Mixture Sensor", (1985).
Mieno Toshiyuki
Nakajima Toyohei
Ohno Nobuyuki
Okada Yasushi
Argenbright Tony M.
Honda Giken Kogyo Kabushiki Kaisha
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