1. A fuel injection control system for a vehicle having a throttle and an automatic engine stopping and starting system comprising:
a throttle sensor for detecting throttle opening,
engine start judging means, for starting the engine in response to throttle opening after automatic stoppage of the engine,
basic injection amount calculating means, for calculating a basic fuel injection amount on the basis of predetermined engine parameters, and
injection amount increasing means for increasing the fuel injection amount at the time of starting the engine from the automatic stoppage state of the engine, based on throttle opening.
2. The fuel injection control system of claim 1, further comprising:
injection amount decreasing means for decreasing the fuel injection amount on the basis of the throttle opening at the time of starting the engine from a state other than from the automatic stoppage state of the engine.
3. The fuel injection control system of claim 2, wherein the injection amount increasing means comprises:
an injection amount increase table comprising the relationship between the throttle opening at the engine starting time and an injection amount increase coefficient,
means for obtaining an injection amount increase coefficient on the basis of the throttle opening and the injection amount increase table, and
calculating means for setting a new basic injection amount as the result of multiplying the basic injection amount by the injection amount increase coefficient.
4. The fuel injection control system of claim 2, wherein the throttle opening at which the increase of the injection amount is started is smaller than the throttle opening at which the decrease of the injection amount is started.
5. The fuel injection control system of claim 4, wherein the throttle opening at which the increase of the injection amount is started is about 25% open and the throttle opening at which the decrease of the injection amount is started is about 50% open.
6. The fuel injection control system of claim 1, wherein the vehicle is a two-wheeled, single-cylinder vehicle.
7. The fuel injection control system of claim 1, further comprising a seat switch, wherein the seat switch has a loaded position and an unloaded position, wherein the engine start judging means only starts the engine in response to throttle opening when the seat switch is in the loaded position.
8. A fuel injection control system for a vehicle with an automatic engine stopping and starting system mounted thereon for automatically stopping an engine in response to a predetermined vehicle stopping condition and thereafter restarting the engine in response to a predetermined vehicle starting operation, the fuel injection control system comprising:
a throttle sensor for detecting the throttle opening,
engine start judging means for starting the engine in response to a throttle opening operation during automatic stoppage of the engine,
basic injection amount calculating means for calculating a basic fuel injection amount on the basis of predetermined engine parameters,
injection amount decreasing means for decreasing the fuel injection amount at the time of starting the engine, and
injection amount decrease prohibition means for prohibiting decrease of the fuel injection amount at the time of starting the engine from an automatic stoppage state of the engine.
9. The fuel injection control system of claim 8, the predetermined engine parameters comprising engine cooling water temperature and engine speed.
10. The fuel injection control system of claim 8, wherein the vehicle is a two-wheeled, single-cylinder vehicle.
11. The fuel injection control system of claim 8, further comprising a seat switch, wherein the seat switch has a loaded position and an unloaded position, wherein the engine start judging means only starts the engine in response to throttle opening when the seat switch is in the loaded position.
12. A method for controlling the injection amount of a fuel supplied to an engine attached to a vehicle having an automatic engine stopping and starting system, comprising:
sensing throttle opening;
sensing pre-determined conditions;
calculating a basic fuel injection amount;
determining the stoppage state of the engine; and
adjusting the basic fuel injection amount at the time of starting the engine from the automatic stoppage state of the engine, based on throttle opening.
13. The method of claim 12, wherein the predetermined conditions comprise engine cooling water temperature and engine speed.
14. The method of claim 12, wherein adjusting the basic fuel injection amount in response to the stoppage state of the engine, comprises increasing the fuel injection amount when an automatic stoppage state is detected.
15. The method of claim 12, wherein adjusting the basic fuel injection amount in response to the stoppage state of the engine, comprises decreasing the fuel injection amount when a non-automatic stoppage state is detected.
16. The method of claim 12, further comprising the step of cranking the engine.
17. The method of claim 16, the vehicle comprising a seat switch having a loaded position and an unloaded position, wherein the step of cranking the engine is only performed when the seat switch is in the loaded position.
18. The method of claim 12, wherein the vehicle is a two-wheeled, single-cylinder vehicle.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A method comprising:
externally injecting narrow-band incoherent light signal generated by a broadband incoherent light source into a light source capable of lasing through a circulator or an optical power splitter;
suppressing any lasing modes outside of a bandwidth of the injected light signal by injecting the narrow-band incoherent light signal into the light source capable of lasing;
locking an output wavelength of the light source capable of lasing within the bandwidth of the injected light
increasing a side mode suppression ratio of the wavelength locked output by increasing a power of the injected incoherent light signal;
modulating data directly onto the output wavelength of the light source capable of lasing that is locked by the injected incoherent light signal to provide a modulated signal so that when a bias current applied to the light source capable of lasing is lower than a threshold current, an output of the light source capable of lasing is a reflected incoherent light; and
inserting a polarization controller between the circulator or the optical power splitter and the light source capable of lasing to increase an extinction ratio of the modulated signal.
2. The method of claim 1, further comprising:
generating the narrow-band injected incoherent light signal from a broadband incoherent light source.
3. The method of claim 2, further comprising:
filtering a broadband wavelength of light from the broadband incoherent light source to generate the injected narrow-band incoherent light signal.
4. The method of claim 3, wherein the filtering is adjustable.
5. The method of claim 3, wherein the filtering includes restricting the bandwidth of the incoherent light signal within a predetermined range.
6. The method of claim 2, wherein the broadband incoherent light source includes an Erbium Doped Fiber Amplifier (EDFA).
7. The method of claim 2, wherein the broadband incoherent light source includes a Light Emitting Diode (LED).
8. The method of claim 2, wherein the broadband incoherent light source includes a superluminescent diode.
9. The method of claim 1, wherein the light source capable of lasing is a Fabry-Perot laser diode.
10. The method of claim 1, wherein the light source capable of lasing is biased above a threshold.
11. The method of claim 1, wherein the light source capable of lasing is biased below a threshold.
12. The method of claim 1, wherein the modulating includes modulating a current of the light source capable of lasing.
13. An apparatus, comprising:
a light source capable of lasing to receive through a circulator or an optical power splitter an externally injected narrow-band incoherent light signal that is selected to suppress one or more lasing modes outside of a bandwidth of the injected narrow-band incoherent light signal when the injected narrow-band incoherent light signal is received and to produce an output wavelength from the light source capable of lasing that is locked within the bandwidth of the injected incoherent light signal, wherein the light source capable of lasing is further configured to increase a side mode suppression ratio of the wavelength locked output by increasing a power of the injected incoherent light signal;
wherein the light source capable of lasing is modulated directly to provide a modulated signal, so that when a bias current applied to the light source capable of lasing is lower than a threshold current, an output of the light source capable of lasing is a reflected incoherent light; and
a polarization controller coupled between the circulator or the optical power splitter and the light source capable of lasing to increase an extinction ratio of the modulated signal.
14. The apparatus of claim 13, wherein the light source capable of lasing is a Fabry-Perot laser diode.
15. The apparatus of claim 13, further comprising:
a tuneable bandpass filter to filter a broadband wavelength of light from a broadband wavelength source to pass a selected band of wavelengths from the broadband wavelength of light to the light source capable of lasing.
16. The apparatus of claim 13, wherein the light source capable of lasing is biased above a threshold.
17. The apparatus of claim 13, wherein the light source capable of lasing is biased below a threshold.
18. The apparatus of claim 13, further comprising
a broadband incoherent light source to generate an incoherent light to inject into the light source capable of lasing.
19. The apparatus of claim 18, wherein the broadband incoherent light source includes an Erbium Doped Fiber Amplifier (EDFA).
20. The apparatus of claim 18, wherein the broadband incoherent light source includes a Light Emitting Diode (LED).
21. The apparatus of claim 18, wherein the broadband incoherent light source includes a superluminescent diode.