Internal-combustion engines – Charge forming device – Auxiliary control of carburetor fuel metering
Patent
1985-12-11
1987-08-11
Dolinar, Andrew M.
Internal-combustion engines
Charge forming device
Auxiliary control of carburetor fuel metering
25112911, 318685, F02D 4100
Patent
active
046854347
ABSTRACT:
In a carburetor having a flow control element axially movable within an air bleed passage in the carburetor body for controlling the cross-sectional area of the passage and a stepper motor on the body for effecting axial movement of the control element, an input circuit produces an electric signal indicative of the operating condition of an engine. A computer determines rotary steps of the motor in response to the electric signal for optimizing the cross-sectional area of the passage in relation to the operating condition of the engine, an a whether the number of the determined rotary steps is more than the actual rotary steps of the motor. A first command signal and a second command signal, and first and second control signals are produced respectively for effecting one rotary step of the motor in a direction defined by each of the command signals. The computer is responsive to one of the control signals to measure a first time duration for one rotary step of the motor to produce a first time signal upon lapse of the first time duration, responsive to change of one of the command signals to the other to measure a second time duration for one reverse rotary step of the motor to produce a second time signal upon lapse of the second time duration, and further responsive to one of the time signals to selectively apply the control signals to the motor.
REFERENCES:
patent: 4229387 (1980-10-01), Rogerson et al.
patent: 4376430 (1983-03-01), Takada et al.
"Internal Combustion Engine", vol. 22, No. 281 (pp. 29 to 36) published by Kabushiki kaisha Sankai-do In Japan on Aug. 1, 1983.
Ando Tsuneo
Asada Yukitoshi
Kasuya Kazusato
Yasuda Takeru
Aisan Kogyo Kabushiki Kaisha
Dolinar Andrew M.
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