EP0229315A2
Expired / Lapsed
EP
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Automotive engine idle speed control device
Assignee: Hitachi Ltd
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Filing: 1986-12-09
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Granted: —
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Expires: 2006-12-09
Abstract
Abstract Automotive engine idle speed control device meters the flow rate of air supplied to the engine bypassing an intake pipe thereof during engine idle operation to thereby control the engine idle speed. An actuating vacuum is produced in accordance with an electrical signal and acts on a diaphragm (33) fixed to a valve member (25) movable with the diaphragm (33) to meter the bypass air flow. To cancel any external force acting on the valve, compensation means (39 - 43) is provided to control the vacuum on the diaphragm (33) independently of the electrical signal to displace the diaphragm in a direction (44) opposite to the direction (45) of action of the external force on the valve (21, 22, 23).
Inventors
- 👤 Chiaki Niida
- 👤 Tomoo Ito
- 👤 Torazo Nishimiya
- 👤 Takashi Iseyama
- 👤 Koichiro Yamada
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 18:46
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/18; F02M; F02M3/00; F02M3/06; F02M3/07; F02M3/075
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
176 words
An automotive engine idle speed control device for use in a bypass air passage extending in bypassing relationship to an intake pipe of the engine, said device being adapted to control the rate of air flow through said bypass air passage in response to an electrical signal to thereby control the idle speed of the engine, said device including: solenoid means (20) to which said electrical signal is supplied; a diaphragm (33) adapted to be deflected by a force produced by vacuum acting thereon; means (17, 18, 19, 27, 28, 29) for controlling the level of the vacuum on said diaphragm in response to said electrical signal supplied to said solenoid means (20); valve means (21, 22, 23) secured to said diaphragm for movement therewith to vary an air-passage area of said bypass air passage; and compensation means (39, 40, 41, 42, 43) for controlling the level of the vacuum independently of said electrical signal to said solenoid means (20) so as to cancel any effect of external force on said valve means (21, 22, 23).
Claim 2
Dependent Claim
176 words
An automotive engine idle speed control device for use in a bypass air passage extending in bypassing relationship to an intake pipe of the engine, said device being adapted to control the rate of air flow through said bypass air passage in response to an electrical signal to thereby control the idle speed of the engine, said device including: solenoid means (20) to which said electrical signal is supplied; a diaphragm (33) adapted to be deflected by a force produced by vacuum acting thereon; means (17, 18, 19, 27, 28, 29) for controlling the level of the vacuum on said diaphragm in response to said electrical signal supplied to said solenoid means (20); valve means (21, 22, 23) secured to said diaphragm for movement therewith to vary an air-passage area of said bypass air passage; and compensation means (39, 40, 41, 42, 43) for controlling the level of the vacuum independently of said electrical signal to said solenoid means (20) so as to cancel any effect of external force on said valve means (21, 22, 23).
Claim 3
Dependent Claim
167 words
An engine idle speed control device according to claim 1, said vacuum level controlling means includes a plunger (19) adapted to be actuated by said solenoid means, a closure member (29) provided on an end of said plunger (19,) a stem (25) interconnecting said valve means (21, 22, 23) and said diaphragm (33) coaxially therewith to transmit a displacement caused by the deflection of said diaphragm (33) to said valve means (21, 22, 23), said stem (25) being formed therein with a communication passage (30) extending therethrough and having open end (43) directed to said closure member (29) for cooperation therewith, means (32, 34, 36, 38) cooperating with said diaphragm to define a vacuum chamber disposed on the downstream side of said valve means (21, 22, 23), the other end (39) of said communication passage (30) being open in said vacuum chamber, and spring means (42) biasing said diaphragm (33) in a valve-closing direction and against the force produced by the vacuum acting on said diaphragm (33).
Claim 4
Dependent Claim
133 words
An engine idle speed control device according to Claim 1, wherein said vacuum level controlling means includes a plunger adapted to be actuated by said solenoid means, a closure member provided on an end of said plunger, a stem interconnecting said valve means and said diaphragm coaxially therewith to transmit a displacement caused by the deflection of said diaphragm to said valve means, said stem being formed therein with a communication passage extending therethrough and having an end open in said bypass passage downstream of said valve means, means cooperating with said diaphragm to define a vacuum chamber, the other end of said communication passage being open in said vacuum chamber, and spring means biasing said diaphragm in a valve-closing direction and against the force produced by the vacuum acting on said diaphragm.
Claim 5
Dependent Claim
167 words
An engine idle speed control device for use in a bypass air passage extending in bypassing relationship to an intake pipe of the engine, said device being adapted to control the rate of air flow through said bypass air passage in response to an electrical signal to thereby control the idle speed of the engine, said device including: solenoid means to which said electrical signal is supplied; a diaphragm adapted to be deflected by a force produced by vacuum acting thereon; means for controlling the level of the vacuum on said diaphragm in response to said electrical signal supplied to said solenoid means; valve means movable with said diaphragm and operative to control the rate of air flow through said bypass air passage in proportion to the electrical signal supplied to said solenoid means; and compensation means for adjusting the displacement of said diaphragm in accordance with the intake vacuum so as to cancel a force on said valve means produced by the intake vacuum acting thereon.
Claim 6
Dependent Claim
167 words
An engine idle speed control device for use in a bypass air passage extending in bypassing relationship to an intake pipe of the engine, said device being adapted to control the rate of air flow through said bypass air passage in response to an electrical signal to thereby control the idle speed of the engine, said device including: solenoid means to which said electrical signal is supplied; a diaphragm adapted to be deflected by a force produced by vacuum acting thereon; means for controlling the level of the vacuum on said diaphragm in response to said electrical signal supplied to said solenoid means; valve means movable with said diaphragm and operative to control the rate of air flow through said bypass air passage in proportion to the electrical signal supplied to said solenoid means; and compensation means for adjusting the displacement of said diaphragm in accordance with the intake vacuum so as to cancel a force on said valve means produced by the intake vacuum acting thereon.
Claim 7
Dependent Claim
203 words
An engine idle speed control device comprising: a solenoid section including a cylindrical coil, a core and a plunger both disposed in said coil, and a closure member fixed to an end of said plunger, said solenoid section being adapted to convert an electrical input into said coil to a position of said closure member; and a metering section including a body defining therein an air passage for a flow of air to be metered, a valve seat formed on said body, a valve member adapted to cooperate with said valve seat to meter the air flow, a diaphragm fixed to said valve member, and means cooperating with said diaphragm to define a pressure-adjusting chamber; said valve member including a central portion which is formed therein with an axial communication passage providing a communication between an atmospheric side of said air passage and said diaphragm chamber, said communication passage being provided at its one end with a variable orifice having an open area which is progressibly changed in accordance with a change of the position of said valve member relative to said valve seat, the other end of said communication passage being disposed in opposite relationship to said closure member on said plunger.
Claim 8
Dependent Claim
203 words
An engine idle speed control device comprising: a solenoid section including a cylindrical coil, a core and a plunger both disposed in said coil, and a closure member fixed to an end of said plunger, said solenoid section being adapted to convert an electrical input into said coil to a position of said closure member; and a metering section including a body defining therein an air passage for a flow of air to be metered, a valve seat formed on said body, a valve member adapted to cooperate with said valve seat to meter the air flow, a diaphragm fixed to said valve member, and means cooperating with said diaphragm to define a pressure-adjusting chamber; said valve member including a central portion which is formed therein with an axial communication passage providing a communication between an atmospheric side of said air passage and said diaphragm chamber, said communication passage being provided at its one end with a variable orifice having an open area which is progressibly changed in accordance with a change of the position of said valve member relative to said valve seat, the other end of said communication passage being disposed in opposite relationship to said closure member on said plunger.
Claim 9
Dependent Claim
42 words
An engine idle speed control device according to Claim 5, wherein said variable orifice is controlled in accordance with the stroke of said valve member such that the open area of said variable orifice is decreased as the valve stroke is increased.
Claim 10
Dependent Claim
29 words
An engine idle speed control device according to Claim 5, wherein said diaphragm is so disposed as to form a part of an inner surface of said air passage.
Claim 11
Dependent Claim
191 words
An idle speed control device for an automotive engine of a type that inlcudes an intake pipe and a bypass air passage extending in bypassing relationship to said intake pipe, said device including a solenoid, a plunger movable by said solenoid, and a valve means operative to control the rate of air flow through said bypass air passage in accordance with a displacement of said plunger, wherein: said valve means has a stem portion which is formed therein with a communication passage; a diaphragm is disposed on an air inlet side of said bypass air passage and fixed to said valve stem; a vacuum chamber is defined between said diaphragm and a casing enclosing said diaphragm, said vacuum chamber being supplied with vacuum from an air outlet side of said bypass air passage through said communication passage in said valve stem; and vacuum chamber being provided with a vacuum-leak passage formed between said vacuum chamber and said air inlet side of said bypass air passage; and a closure member is porivded on an end of said plunger in opposite relationship to an end of said communication passage in said valve stem.
Claim 12
Dependent Claim
191 words
An idle speed control device for an automotive engine of a type that inlcudes an intake pipe and a bypass air passage extending in bypassing relationship to said intake pipe, said device including a solenoid, a plunger movable by said solenoid, and a valve means operative to control the rate of air flow through said bypass air passage in accordance with a displacement of said plunger, wherein: said valve means has a stem portion which is formed therein with a communication passage; a diaphragm is disposed on an air inlet side of said bypass air passage and fixed to said valve stem; a vacuum chamber is defined between said diaphragm and a casing enclosing said diaphragm, said vacuum chamber being supplied with vacuum from an air outlet side of said bypass air passage through said communication passage in said valve stem; and vacuum chamber being provided with a vacuum-leak passage formed between said vacuum chamber and said air inlet side of said bypass air passage; and a closure member is porivded on an end of said plunger in opposite relationship to an end of said communication passage in said valve stem.
Claim 13
Dependent Claim
26 words
An engine idle speed control device according to Claim 1, wherein said diaphragm is so disposed as to form a part of said bypass air passage.
Claim 14
Dependent Claim
19 words
An engine idle speed control device according to Cliam 8, wherein said vacuum-leak passage is formed in said diaphragm.
Claim 15
Dependent Claim
19 words
An engine idle speed control device according to Cliam 8, wherein said vacuum-leak passage is formed in said diaphragm.
Claim 16
Dependent Claim
40 words
An engine idle speed control device according to Claim 8, wherein a spring means is disposed in said vacuum chamber between said casing and said diaphragm so that said diaphragm is biased by said spring means in a valve-closing direction.
Claim 17
Dependent Claim
30 words
An engine idle speed control device according to Claim 8, wherein said solenoid includes a spring acting on said plunger and a mechanism for adjusting the force of said spring.
References Cited (Backward Citations)
No citation records indexed.
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