Engine air/fuel ratio control

Details Engine air/fuel ratio control Engine air/fuel ratio control

1997-09-26

1998-09-22

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Auxiliary control of carburetor fuel metering

123149D, F02M 712, F02P 100

Patent

active

058099719

ABSTRACT:
A method and device for controlling the fuel and/or air supply to an internal combustion engine in the fuel section thereof, such as a carburetor or a fuel injection system, so that the mixture ratio (A/F ratio) is adjusted automatically to a desired level in response to various operational conditions. In a rotational-speed feed back regulating circuit, a feed-back control unit which receives information on the rotational speed from the engine briefly adjusts an adjustment device to provide a brief change of the mixture ratio and, in connection with the brief A/F/ ratio change, a number of revolution times are measured. At least one revolution time refers to a rotational speed that is essentially unaffected by the A/F ratio change and at least one revolution time refers to a rotational speed that is affected by the A/F ratio change. On the basis of these revolution times, at least one difference in revolution times between affected and unaffected rotational speeds is computed. Based on this difference and on stored information, the control unit will, as the case may be, affect the adjustment means to change the A/F ratio in the desired direction.

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