Multi-fuel engine control with oxygen sensor signal reference co

Details Multi-fuel engine control with oxygen sensor signal reference co Multi-fuel engine control with oxygen sensor signal reference co

1989-12-21

1990-08-07

Cross, E. Rollins

Internal-combustion engines

Charge forming device

Fuel injection system

123440, 123 1A, F02D 4114

Patent

active

049458825

ABSTRACT:
A fuel control for an engine using a liquid fuel mixture of two fuels such as gasoline and methanol acts in closed loop on a vehicle exhaust mounted oxygen sensor to maintain a stoichiometric air/fuel ratio. The closed loop portion of the control compares the oxygen sensor output voltage to a reference or reference window in the process of indicating a lean or rich mixture; and the fuel control is responsive to a fuel composition sensor to shift the reference or reference window with changing fuel composition to maintain a consistent relationship between the reference or reference window and stoichiometry as the fuel composition changes.

REFERENCES:
patent: 4369736 (1983-01-01), Ito
patent: 4401081 (1983-08-01), Wessel et al.
patent: 4438749 (1984-03-01), Schwippert
patent: 4445481 (1984-05-01), Aoki et al.
patent: 4470300 (1984-09-01), Kobayashi
patent: 4594968 (1986-06-01), Degobert et al.
patent: 4625698 (1986-12-01), Jamrog
patent: 4706630 (1987-11-01), Wineland et al.
"An On-Board Sensor for Percent Alcohol" IEEE 0018-9545/0800-0142, 1978 (Aug.).
"Vehicle Operation with Variable Methanol/Gasoline Mixtures" Proceedings VI International Symposium on Alcohol Fuels Technology, May '84.

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