Claims
- 1. An idling revolution number control valve for an internal combustion engine, said valve being disposed in a passage which bypasses a throttle valve arranged in an air intake passage of the internal combustion engine, and proportionally controlling the quantity of air flowing in the bypass passage based on an output of an electronic control unit including an idling revolution number control function, said valve comprising:
- a linearly movable valve control member, an electromagnetic actuating coil surrounding the control member, and means for avoiding a performance degradation of the control valve due to I.sup.2 R heating of the coil, said avoiding means comprising:
- a) said coil being made of a brass series alloy wire material having a temperature coefficient of resistance less than one-half that of copper and an electrical conductivity less than one-third that of copper, and
- b) said coil wire having a greater diameter tan a comparable copper wire coil and a shorter length than a comparable copper wire coil such that said brass series alloy wire coil occupies substantially the same space as a comparable copper wire coil and has substantially the same resistance as a comparable copper wire coil.
- 2. A control valve according to claim 1, wherein the temperature coefficient of resistance of the coil wire is approximately 1.7.times.10.sup.-3 degrees.
Priority Claims (1)
Number |
Date |
Country |
Kind |
3-055409 |
Mar 1991 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 07/825,261 filed Jan. 24, 1992.
US Referenced Citations (3)
Number |
Name |
Date |
Kind |
4161306 |
Brune et al. |
Jul 1979 |
|
4989564 |
Cook et al. |
Feb 1991 |
|
5042448 |
Cook et al. |
Aug 1991 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
63-21746 |
Feb 1988 |
JPX |
Continuations (1)
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Number |
Date |
Country |
Parent |
825261 |
Oct 1992 |
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