Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1983-12-13
1985-10-29
Cox, Ronald B.
Internal-combustion engines
Charge forming device
Fuel injection system
123494, 123488, 123486, F02B 300
Patent
active
045495173
ABSTRACT:
A fuel supply device for internal combustion engines comprising a computer having a memory which stores an air flow quantity characteristic related to a pressure difference between the up- and down-streams of a throttle valve, an air flow quantity to pass the throttle valve and the throttle valve opening degree. A throttle valve actuator is moved by the computer for controlling an air flow quantity to be supplied to an engine. A plurality of sets of throttle valve opening degrees, air flow quantities or pressure differences corresponding to a variety of combinations between a desired air flow quantity and the pressure difference, throttle valve opening degree or air flow quantity at the present time point are read out of memory on the basis of the air flow quantity characteristic, and by an interpolation process the desired throttle valve opening degree, the air flow quantity or pressure difference at the present time point is computed to thereby adjust the throttle valve so as to be in a desired opening degree, the throttle valve opening degree so that the air flow quantity is to be at a desired value or the throttle valve opening degree so that the pressure difference is at a desired value by the throttle valve actuator. This is done in order to enable to a proper supply of an air flow quantity always appropriate to the operating status of the engine without using an air flow sensor. In case the change from the air flow quantity at the present time point to a desired air flow quantity is large, the estimated value of throttle valve opening degree is calculated from the desired value of pressure difference and desired air flow quantity and the throttle valve opening degree is adjusted into this estimated value or desired value.
REFERENCES:
patent: 4335694 (1982-06-01), Mausner
patent: 4359991 (1982-11-01), Stumpp
patent: 4418673 (1983-12-01), Tominari
patent: 4470396 (1984-09-01), Hasumi
Cox Ronald B.
Mikuni Kogyo Kabushiki Kaisha
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