Claims
- 1. A device for controlling an electromechanical transducer comprising:
- an electromagnetic valve including an electromagnetic coil and a movable member displaced in proportional relation to an electrical input signal applied to said electromagnetic coil thereby driving a controlled element;
- at least one switching means for chopping the electrical input signal applied to said electromagnetic coil; and
- means for generating an electrical pulse signal for triggering said switching means,
- wherein the electrical pulse signal generated by said pulse generating means and applied to said switching means has a constant period shorter than the minimum response time required for said movable member to make its predetermined full stroke, and the duty cycle of the electrical pulse signal applied to said switching means is varied to cause displacement of said movable member in proportional relation to the variation of the duty cycle, and
- wherein said switching means comprises two switching elements which are arranged so that said movable member is urged in a first direction when one of said switching elements is turned on, while said movable member is urged in a second direction opposite to said first direction when the other of said switching elements is turned on, and one of said switching elements is maintained in its off-state when the other is placed in its on-state.
- 2. A control device as claimed in claim 1, wherein the stroke of said movable member varies in proportional relation to the variation of said duty cycle, and a very small vibratory stroke component is superposed on the stroke of said movable member.
- 3. A control device as claimed in claim 1, wherein each of said two switching elements is a transistor having two major electrodes and one control electrode, said two transistors being connected at their first major electrodes across the two terminals of said electromagnetic coil and also with a power source, at their second major electrodes with ground, and at their control electrodes with the two outputs of said pulse generating means respectively, said two pulse signals having their on-off periods inverted relative to each other appearing from said two outputs of said pulse generating means.
- 4. A control device for controlling fluid flow in an internal combustion engine, comprising:
- a valve for controlling fluid flow;
- means for detecting the operating condition of said internal combustion engine;
- an electromagnetic device including an electromagnetic coil and a movable member to be displaced in proportional relation to electric current applied to said electromagnetic coil thereby driving said valve;
- an electric source for energizing said electromagnetic coil;
- at least one switching means for chopping current supplied from said source to said electromagnetic coil;
- means for generating an electrical pulse signal composed of a plurality of pulses for actuating said switching means, said pulse signal generating means comprising a digital computer for receiving the output signal from said detecting means as an input signal, and for processing quantized digital signals and for converting the quantized digital signals to pulse signals, each of said pulses having a constant period of 5-15 msec, the constant period being shorter than a minimum period of time required for said movable member to be moved by its predetermined full stroke and sufficient for said movable member to be moved; and
- means for changing the duty cycle of each of said pulses applied to said switching means,
- wherein said movable member is displaced in proportional relation to the duty cycle changed by said duty cycle changing means.
- 5. A control device as claimed in claim 4, wherein said valve for controlling fluid flow is disposed for controlling an air flow rate flowing into a carburetor of the internal combustion engine.
- 6. A control device as claimed in claim 4, wherein said movable member is provided with a plunger having at least one needle valve mounted thereon, and a coil spring is provided for energizing said plunger with a constant force.
- 7. A control device as claimed in claim 6, wherein two needle valves are mounted on said plunger.
- 8. A control device as claimed in claim 7, wherein said plurality of pulses for actuating said switching means serve for superimposing a very small vibratory stroke component on the stroke of said movable member.
- 9. A control device as claimed in claim 4 or claim 7, wherein said digital computer is a microcomputer.
- 10. A control device for controlling fluid flow in an internal combustion engine, comprising:
- a valve for controlling fluid flow;
- means for detecting the operating condition of said internal combustion engine;
- an electromagnetic device including an electromagnetic coil and a movable member to be displaced in proportional relation to electric current applied to said electromagnetic coil thereby driving said valve;
- an electric source for energizing said electromagnetic coil;
- at least one switching means for chopping current supplied from said source to said electromagnetic coil;
- means for generating an electrical pulse signal composed of a plurality of pulses for actuating said switching means, said pulse signal generating means comprising a digital computer for receiving the output signal from said detecting means as an input signal, and for processing quantized digital signals and for converting the quantized digital signals to pulse signals, each of said pulses having a constant period, the constant period being shorter than a minimum period of time required for the movable member to be moved by its predetermined full stroke and the constant period being one of equal to and longer than a period for said movable member to be moved without mechanical hysteresis; and
- means for changing the duty cycle of each of said pulses applied to said switching means,
- wherein said movable member is displaced in proportional relation to the duty cycle changed by said duty cycle changing means.
- 11. A control device as claimed in claim 10, wherein the minimum period of time required for said movable member to be moved by its predetermined full stroke is the time T.sub.0 and the period of time for said movable member to be moved without mechanical hysteresis is T.sub.0 /4.
- 12. A control device as claimed in claim 11, wherein the minimum time period T.sub.0 is the time lag of the electromagnetic device which is 15-20 msec, and the time period T.sub.0 /4 for said movable member to be moved without mechanical hysteresis is about 5 msec. .Iadd.
- 13. A control device comprising:
- electromagnetic means including an electromagnetic coil and a movable member to be displaced in proportional relation to electric current applied to said electromagnetic coil thereby driving a control means;
- an electric source for energizing said electromagnetic coil;
- at least one switching means for chopping current supplied from said source to said electromagnetic coil;
- means for generating an electrical pulse signal composed of a plurality of pulses for actuating said switching means, each of said pulses having a constant period shorter than a minimum period of time required for said movable member to be moved by its predetermined full stroke and sufficient for said movable member to be moved; and
- means for changing the duty cycle of each of said pulses applied to said switching means,
- wherein said movable member is displaced in proportional relation to the duty cycle changed by said duty cycle changing means..Iaddend. .Iadd.14. A control device as claimed in claim 13, wherein said plurality of pulses for actuating said switching means serve for superimposing a very small vibratory stroke component on the stroke of said movable member..Iaddend. .Iadd.15. A control device as claimed in claim 13, wherein said constant
- period is a period of 5-15 msec..Iaddend. .Iadd.16. A control device as claimed in claim 13, wherein said control device serves for controlling fluid flow in an internal combustion engine, said control means controlling the fluid flow, means for detecting the operating condition of said internal combustion engine, and said pulse signal generating means including a digital computer for receiving the output signal from said detecting means as an input signal, and for processing quantized digital signals and for converting the quantized digital signals to pulse signals..Iaddend. .Iadd.17. A control device as claimed in claim 16, wherein said control means is disposed for controlling a flow rate of air flowing into a carburetor of the internal combustion engine..Iaddend. .Iadd.18. A control device as claimed in claim 16, wherein said digital computer is a microcomputer..Iaddend. .Iadd.19. A control device as claimed in claim 16, wherein said control means includes a movable element movable in accordance with the movement of said movable member of said electromagnetic means for controlling fluid flow in the internal combustion engine..Iaddend. .Iadd.20. A control device comprising:
- electromagnetic means including an electromagnetic coil and a movable member to be displaced in proportional relation to electric current applied to said electromagnetic coil thereby driving a control means;
- an electric source for energizing said electromagnetic coil;
- at least one switching means for chopping current supplied from said source to said electromagnetic coil;
- means for generating an electrical pulse signal composed of a plurality of pulses for actuating said switching means, each of said pulses having a constant period, the constant period being shorter than a minimum period of time required for the movable member to be moved by its predetermined full stroke and the constant period being one of equal to and longer than a period for said movable member to be moved without mechanical hysteresis; and
- means for changing the duty cycle of each of said pulses applied to said switching means,
- wherein said movable member is displaced in proportional relation to the
- duty cycle changed by said duty cycle changing means..Iaddend. .Iadd.21. A control device as claimed in claim 20, wherein the minimum period of time required for said movable member to be moved by its predetermined full stroke is the time T.sub.0 and the period of time for said movable member to be moved without mechanical hysteresis is T.sub.0 /4..Iaddend. .Iadd.22. A control device as claimed in claim 21, wherein the minimum time period T.sub.0 is the time lag of electromagnetic device which is 15-20 msec, and the time period T.sub.0 /4 for said movable member to be moved without mechanical hysteresis is about 5 msec..Iaddend. .Iadd.23. A control device as claimed in claim 20, wherein said plurality of pulses for actuating said switching means serve for superimposing a very small vibratory stroke component on the stroke of said movable member..Iaddend. .Iadd.24. A control device as claimed in claim 20, wherein said constant
- period is a period of 5-15 msec..Iaddend. .Iadd.25. A control device as claimed in claim 20, wherein said control device serves for controlling fluid flow in an internal combustion engine, said control means controlling the fluid flow, means for detecting the operating condition of said internal combustion engine, and said pulse signal generating means including a digital computer for receiving the output signal from said detecting means as an input signal, and for processing quantized digital signals and for converting the quantized digital signals to pulse signals..Iaddend. .Iadd.26. A control device as claimed in claim 25, wherein said control means is disposed for controlling a flow rate of air flowing into a carburetor of the internal combustion engine..Iaddend. .Iadd.27. A control device as claimed in claim 25, wherein said digital computer is a microcomputer..Iaddend. .Iadd.28. A control device as claimed in claim 25, wherein said control means includes a movable element movable in accordance with the movement of said movable member of said electromagnetic means for controlling fluid flow in the internal combustion engine..Iaddend.
Priority Claims (1)
Number |
Date |
Country |
Kind |
52-35253 |
Mar 1977 |
JPX |
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LIST OF PRIOR ART REFERENCES (37 CFR 1.56 (a))
This is a continuation of application Ser. No. 891,003, filed Mar. 28, 1978, now abandoned.
The following reference is cited to show the state of the art:
US Referenced Citations (6)
Non-Patent Literature Citations (1)
Entry |
"Pulse-Width Modulation of Magnets," T. L. Wells, IBM Tech. Disclosure Bulletin, vol. 21, No. 3, Aug. 1978. |
Reissues (1)
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Number |
Date |
Country |
Parent |
152666 |
May 1980 |
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