Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1987-04-24
1988-05-31
Ostrager, Allen M.
Internal-combustion engines
Charge forming device
Fuel injection system
F02D 502
Patent
active
047473860
ABSTRACT:
The amount of fuel injection is augmented on a hot engine start by prolonging the fuel injection time or boosting the fuel pressure. For extension of the fuel injection time, a basic fuel injection time is prolonged according to a hot start fuel increment coefficient which is obtained from a two-dimentional map based on a intake air temperature stored in a memory during an engine operation (an operating intake air temperature) and the difference between the operating intake air temperature and an intake air temperature detected on restart of the engine. In case of an apparatus for augmenting the fuel injection by boosting the fuel pressure to be supplied to a fuel injector, the control pressure to be admitted into a diaphragm chamber of a pressure regulator is switched according to a two-dimentional map providing switching and unswitching conditions in terms of the difference between the operating intake air temperature and restarting intake air temperature in relation with operating intake air temperature.
REFERENCES:
patent: 3792693 (1974-02-01), Luchaco
patent: 4469072 (1984-09-01), Kobayashi
patent: 4522177 (1985-06-01), Kawai et al.
patent: 4594986 (1986-06-01), Shimoda et al.
Ostrager Allen M.
Toyota Jidosha & Kabushiki Kaisha
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