Claims
- 1. A control system for an electromagnetic valve having a valve element, a pair of solenoids opposed to each other and disposed to drive said valve element in respective directions opposite to each other and between a first extreme position and a second extreme position, and spring means interposed between said solenoids, for biasing said valve element toward a neutral position intermediate between said first and second extreme positions, the control system comprising:
- control means for controlling said solenoids in a manner such that when said valve element is to start moving from one of said first and second extreme positions toward the other extreme position, energization of a corresponding one of said solenoids is terminated, and energization of the other solenoid for a first predetermined time period is started when a predetermined delay time period elapses from said termination of said corresponding one solenoid,
- wherein said control means carries out energization of said corresponding one solenoid over a second time period shorter than said first predetermined time period and within said first predetermined time period.
- 2. A control system as claimed in claim 1, wherein said predetermined delay time period is set to at least a time period from the time said energization of said corresponding one of said solenoids is terminated to a time when an acceleration of said valve element attributable to said spring means becomes almost zero.
- 3. A control system for an electromagnetic valve having a valve element, a pair of solenoids opposed to each other and disposed to drive said valve element in respective directions opposite to each other and between a first extreme position and a second extreme position, and spring means interposed between said solenoids, for biasing said valve element toward a neutral position intermediate between said first and second extreme positions, the control system comprising:
- control means for controlling said solenoids in a manner such that said solenoids are both energized over a predetermined overlapping time period during movement of said valve element from one of said first and second extreme positions toward the other extreme position,
- wherein during said movement of said valve element from one extreme position toward the other extreme position, said control means carries out energization of one of said solenoids over a first predetermined time period, and carries out energization of the other solenoid over a second predetermined time period as said predetermined overlapping time period, which is shorter than said first predetermined time period and within said first predetermined time period.
- 4. A control system as claimed in claim 1, wherein said first and second extreme positions are a fully closed position of said valve element and a fully open position thereof, respectively.
- 5. A control system as claimed in claim 1, 2 or 4, wherein said electromagnetic valve is an intake valve for opening and closing an intake port of an internal combustion engine.
- 6. A control system as claimed in claim 1, 2 or 4, wherein said electromagnetic valve is an exhaust valve for opening and closing an exhaust port of an internal combustion engine.
- 7. A control system for an electromagnetic valve having a valve element, a pair of solenoids opposed to each other and disposed to drive said valve element in respective directions opposite to each other and between a first extreme position and a second extreme position, and spring means interposed between said solenoids, for biasing said valve element toward a neutral position intermediate between said first and second extreme positions, the control system comprising:
- control means for controlling said solenoids in a manner such that said solenoids are both energized over a predetermined overlapping time period during movement of said valve element from one of said first and second extreme positions toward the other extreme position,
- said solenoids being energized to exert forces in opposite directions on said valve element.
- 8. A control system as claimed in claim 7, wherein during said movement of said valve element from one extreme position toward the other extreme position, said control means carries out energization of one of said solenoids over a first predetermined time period, and carries out energization of the other solenoid over a second predetermined time period as said predetermined overlapping time period, which is shorter than said first predetermined time period and within said first predetermined time period.
- 9. A control system as claimed in claim 8, wherein said control means starts said energization of the other solenoid upon lapse of a third predetermined time period after said energization of said one solenoid is started.
- 10. A control system as claimed in claim 7, 8, or 9, wherein said electromagnetic valve is an intake valve for opening and closing an intake port of an internal combustion engine.
- 11. A control system as claimed in claim 7, 8, or 9, wherein said electromagnetic valve is an exhaust valve for opening and closing an exhaust port of an internal combustion engine.
- 12. A control system as claimed in claim 10, including operating condition-detecting means for detecting operating conditions of said internal combustion engine, and wherein said first to third predetermined time periods are set according to said operating conditions of said internal combustion engine detected by said operating condition-detecting means.
- 13. A control system as claimed in claim 11, including operating condition-detecting means for detecting operating conditions of said internal combustion engine, and wherein said first to third predetermined time periods are set according to said operating conditions of said internal combustion engine detected by said operating condition-detecting means.
- 14. A control system as claimed in claim 3, wherein said control means starts said energization of the other solenoid upon lapse of a third predetermined time period after said energization of said one solenoid is started.
Priority Claims (1)
Number |
Date |
Country |
Kind |
6-295895 |
Nov 1994 |
JPX |
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Parent Case Info
This application is a continuation of application Ser. No. 08/448,676, filed May 24, 1995, now abandoned.
US Referenced Citations (10)
Foreign Referenced Citations (1)
Number |
Date |
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6-17642 |
Mar 1994 |
JPX |
Continuations (1)
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Number |
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Parent |
448676 |
May 1995 |
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