Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1983-04-14
1985-12-24
Cox, Ronald B.
Internal-combustion engines
Charge forming device
Fuel injection system
F02P 504
Patent
active
045599165
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates particularly to an ignition apparatus based on semiconductors for determining an angular advance of an ignition position by an electronic circuit.
2. Description of the Prior Art
FIG. 1 is a circuit diagram illustrating a conventional ignition apparatus of the type referred to. As shown in FIG. 1, a magnetic rotor 1 is rotated in synchronism with an engine (not shown) and has a protrusion on one portion thereof; a pulser 2 which is composed of a magneto generator for detecting an ignition position of a maximum angular advance is provided; a similar pulser 3 is also provided for detecting an ignition position of a minimum angular advance.
A signal from the pulser 2 is arranged to be applied, as a setting signal, to a setting input S of RS FLIP-FLOP circuit 4 (which is called hereinafter a FF) and a signal from the pulser 3 is arranged to be applied, as a resetting signal, to a resetting input R of the FF 4.
An output Q of this FF 4 is connected through a resistance 5 to an inverting input of an operational amplifier 6 (which is called hereinafter an op-amp) and is also connected to an emitter of a transistor 9. An output end Q of the FF 4 is connected to a base of the transistor 9 through a pulse circuit 8.
This pulse circuit 8 may be a differentiation circuit for generating a pulse with a sufficiently short pulse width during the time that an output signal developed at the output Q of the FF 4 rises from an "L" level to an "H" level.
A non-inverting input of said op-amp 6 is supplied with a second voltage V.sub.2 and an output of this op-amp 6 is connected to a collector of the transistor 9 and is also connected to one input of a comparator 10. The other input of this comparator 10 is supplied with a first voltage V.sub.1. An integrating capacitor 7 is connected between the emitter and collector of the transistor 9.
The following description will be made by using timing charts of FIG. 2 (DIAGRAMS A-G) with respect to the operation of the ignition apparatus of FIG. 1. The waveforms shown by FIG. 2 (DIAGRAMS A-G) expresses signals on those portions shown by (a) to (g) in FIG. 1. A signal shown in FIG. 2(a) is outputted from the pulser 2 and on the other hand a signal shown in FIG. 2(b) is outputted from the pulser 3. Accordingly an output from the output Q of the FF 4 and the output from the output Q are substantially as shown in FIGS. 2(c) and (d) respectively.
First the FF 4 is put in its set state with a signal from the pulser 2 which has detected a maximum ignition advanced position and a discharging circuit is formed of the output Q of the FF 4, the resistance 5, the capacitor 7 and the output of the op-amp 6 to initiate the discharging of the capacitor 7 with a predetermined constant current. That is, the discharge current I.sub.1 results in ##EQU1## where V.sub.OH : Output voltage at its high level from RS FLIP-FLOP 4.
Then, when a signal detecting a minimum ignition advanced position is issued from the pulser 3, the FF 4 is inverted from its set state to its reset state to invert the output from the output Q of the FF 4 from its "L" level to its "H" level. Thus, an output is issued from the pulse circuit 8 as shown in FIG. 2(e).
The transistor 9 receives this output to cause the conduction thereof, causing the capacitor 7 to be shortcircuited. This capacitor 7 is rapidly discharged and the output voltage from the op-amp 6 becomes a set voltage at the non-inverting input thereof, that is, the second voltage V.sub.2. If the output signal from the pulse circuit 8 disappears, then the transistor 9 is cut off. Since the FF 4 has already been in its reset state, a charging circuit is formed which is the output of the op-amp 6, the capacitor 7, the resistance 5 and the output Q of the FF 4. The capacitor 7 is then charged with a predetermined constant current. That is, a charging current I.sub.2 results in ##EQU2## where V.sub.OL : output voltage at its low level from RS FLIP-FLOP 4.
Thereafter, the similar operation is repeated t
REFERENCES:
patent: 3867916 (1975-02-01), Bigalke
patent: 3874351 (1975-04-01), Asler
patent: 3916855 (1975-11-01), Fauser
patent: 4079709 (1978-03-01), Schuette
patent: 4100895 (1978-07-01), Hattori
patent: 4104997 (1978-08-01), Padgitt
patent: 4201163 (1980-05-01), Hattori
patent: 4208992 (1980-06-01), Polo
Cox Ronald B.
Mitsubishi Denki & Kabushiki Kaisha
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