Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1984-12-27
1986-09-30
Cox, Ronald B.
Internal-combustion engines
Charge forming device
Fuel injection system
123486, 123432, F02B 300
Patent
active
046141740
ABSTRACT:
An engine intake system having primary and secondary intake passages leading to the same combustion chamber. The secondary intake passage is provided with an auxiliary throttle valve which is opened under a relatively high load engine operation. The primary and secondary intake passages are respectively provided with first and second fuel injection valves which are controlled by an electronic control unit in accordance with engine operating conditions. The electronic control unit functions to determine a basic fuel supply quantity based on the intake airflow and the engine speed and modify the basic quantity by a compensation factor which is obtained from a compensation map. The compensation map is divided into two zones, the first zone substantially corresponding to the engine operating condition wherein the auxiliary throttle is closed, the second zone substantially corresponding to the engine operating condition wherein the auxiliary throttle valve is opened. The compensation factors in the second zone are determined taking into consideration the difference between the suction pressure at the first fuel injection valve and that at the second fuel injection valve. The second fuel injection valve is operated in the engine operating condition wherein the compensation factor in the second zone is selected.
REFERENCES:
patent: 4140088 (1979-02-01), Vulpillieres
patent: 4309971 (1982-01-01), Chiesa
patent: 4359991 (1982-11-01), Stumpp
patent: 4413601 (1983-11-01), Matsuoka
patent: 4418674 (1983-12-01), Hasegawa
patent: 4445483 (1984-05-01), Hasegawa
patent: 4471742 (1984-09-01), Kishi
patent: 4492203 (1985-01-01), Yutaka
Okino Yoshinori
Tanigawa Yoshitaka
Cox Ronald B.
Mazda Motor Corporation
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