Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1985-07-29
1986-08-05
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Fuel injection system
123352, F02D 4300
Patent
active
046036750
ABSTRACT:
To sense proper operation of a servo control loop including a fuel control pedal (1) which operates a command control transducer (2), e.g. a potentiometer coupled thereto, to provide a command signal to a controller (3) which energizes an amplifier (4) operating a positioning motor (5) which, in turn, changes the position of a fuel control element (7, 207), the instantaneous position of which is fed back to the controller by a position control transducer (6), a signal processing and logic circuit (9, 13) is provided which has the actual fuel supply signal applied thereto. The actual fuel supply signal is evaluated with respect to predetermined limits, for example at a "rest" or OFF position of the fuel control element. This condition can be sensed, for example, based on operating data of the engine, e.g. when a brake light switch is operated, the engine operates above a certain speed, or the vehicle operates at a certain speed, or the like. Additionally, a position sensing switch (8) coupled to the control pedal (1) can be monitored by determining if the output signal from the command transducer is within a limited range when the switch is in a position indicating that the pedal is at, or close to, OFF or "rest" position. By evaluating the actual signal from the respective transducers at predetermined positions of the elements to which they are coupled, e.g. the fuel control element (7, 207) being against an idle or rest stop (16, 216) or the fuel control pedal (1) being at "rest" position, limit switches, particularly in the engine compartment, can be eliminated.
REFERENCES:
patent: 4426980 (1984-01-01), Eirele et al.
patent: 4438496 (1984-03-01), Ohie
patent: 4470396 (1984-01-01), Hasumi et al.
patent: 4473052 (1984-09-01), Kamiyama et al.
patent: 4524745 (1985-06-01), Tominari et al.
patent: 4552116 (1985-11-01), Kuroiwa et al.
Junginger Erich
Schnaibel Eberhard
Schneider Erich
Nelli Raymond A.
Robert & Bosch GmbH
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