EP0206091A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Method for control of idle rotations of internal combustion engines
Assignee: Honda Motor Co Ltd
•
Filing: 1986-06-10
•
Granted: —
•
Expires: 2006-06-10
Abstract
Abstract An addition correction term (lat) is added to a feedback control term (Ifb) when an internal combustion engine is idling, a control valve (30) is under feedback control, and an automatic transmission is in drive range (D range). The addition correction term (lat) is calculated by multiplying a predetermined constant value (lato) by at least one of the correction coefficients which are decided based on RPM and temperature of the engine and vehicle speed. A learnt value (Pbref) is calculated based on an intake manifold (33) pressure when an internal combustion engine is in idling condition, the control valve (30) is under feedback control, and an automatic transmission is in disengagement condition, for example, neutral range (N range). When the automatic transmission is turned into D range, an existing manifold pressure is detected and the addition correction term (lat) is calculated based on an difference between the learnt value and the detected manifold pressure.
Inventors
- 👤 Akimasa Yasuoka
- 👤 Takeo Kiuchi
- 👤 Takahiro Iwata
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 23:57
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/04; F02D41/08; F02D41/083; F02D31/00; F02D31/001; F02D31/002; F02D31/003; F02D41/14; F02D41/1401; F02D2041/1413; F02D2041/1422
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
109 words
A method for the control of the idling rotational speed of an internal combustion engine provided with a control valve(30) adapted to control the amount of inlet air to said internal combustion engine during an idling operation thereof by allowing the degree of opening of said control valve(30) to be controlled proportionately to the value of a control valve command (Icmd) obtained on the basis of the sum of a feedback control term(Ifb) and an addition correction term(Iat) conforming to the load of an automatic transmission, characterized by obtaining said addition correction term (Iat) as a function of a parameter representing the operating state of said internal combustion engine.
Claim 2
Independent Claim
109 words
A method for the control of the idling rotational speed of an internal combustion engine provided with a control valve(30) adapted to control the amount of inlet air to said internal combustion engine during an idling operation thereof by allowing the degree of opening of said control valve(30) to be controlled proportionately to the value of a control valve command (Icmd) obtained on the basis of the sum of a feedback control term(Ifb) and an addition correction term(Iat) conforming to the load of an automatic transmission, characterized by obtaining said addition correction term (Iat) as a function of a parameter representing the operating state of said internal combustion engine.
Claim 3
Dependent Claim
24 words
A method according to Claim 1, wherein said parameter representing the operating condition of said internal combustion engine is the number of engine rotations(Ne).
Claim 4
Dependent Claim
32 words
A method according to Claim 2, wherein said addition correction term(Iat) is obtained by correcting a prescribed constant number(Iato) based on a first correction coefficient(Kneat) corresponding to the number of engine rotations.
Claim 5
Dependent Claim
22 words
A method according to Claim 1, wherein said parameter representing the operating condition of said internal combustion engine is the vehicle speed(V).
Claim 6
Dependent Claim
30 words
A method according to claim 4, wherein said addition correction term(Iat) is obtained by correcting the prescribed constant number(Iato) based on a second correction coefficient(Lat) corresponding to the vehicle speed(V).
Claim 7
Dependent Claim
40 words
A method according to Claim 4, wherein said addition correction term(Iat) is obtained by correcting the prescribed constant number(Iato) based on the product of the second correction coefficient(Lat) and a first correction coefficient(Kneat) corresponding to the number of engine rotations.
Claim 8
Dependent Claim
25 words
A method according to Claim 1, wherein said parameter representing the operating condition of said internal combustion engine is the temperature of engine cooling water(Tw).
Claim 9
Dependent Claim
31 words
A method according to Claim 7, wherein said addition correction term(Iat) is obtained by correcting the prescribed constant number(Iato) based on a third correction coefficient(Ktwat) corresponding to the temperature of engine.
Claim 10
Dependent Claim
50 words
A method according to Claim 7, wherein said addition correction term(Iat) is obtained by correcting the prescribed constant number(Iato) based on the product of said third correction coefficient(Ktwat), a first correction coefficient(Kneat) corresponding to the number of engine rotations and a second correction coefficient (Lat) corresponding to the vehicle speed.
Claim 11
Dependent Claim
24 words
A method according to Claim 1, wherein said parameter representing the operating condition of said internal combustion engine is an intake manifold pressure (Pba).
Claim 12
Independent Claim
117 words
A method for the control of the idling rotational speed of an internal combustion engine provided with a control valve(30) adapted to control the amount of inlet air to said internal combustion engine during an idling operation thereof by allowing the degree of opening of said control valve to be controlled proportionately to the value of a control valve command(Icmd) obtained on the basis of the sum of the feedback control term(Ifb) and an additional control term conforming to the external load of said internal combustion engine, characterized by obtaining said additional correction term as a function of a parameter depending upon the deviation of intake manifold pressures(Pba) between no-loaded and loaded conditions of said external load.
Claim 13
Independent Claim
117 words
A method for the control of the idling rotational speed of an internal combustion engine provided with a control valve(30) adapted to control the amount of inlet air to said internal combustion engine during an idling operation thereof by allowing the degree of opening of said control valve to be controlled proportionately to the value of a control valve command(Icmd) obtained on the basis of the sum of the feedback control term(Ifb) and an additional control term conforming to the external load of said internal combustion engine, characterized by obtaining said additional correction term as a function of a parameter depending upon the deviation of intake manifold pressures(Pba) between no-loaded and loaded conditions of said external load.
Claim 14
Dependent Claim
95 words
A method according to Claim 1 or Claim 11, characterized by detecting an internal pressure in the intake manifold on the downstream side of the throttle valve (32) while said control valve(30) is under feedback control, calculating a learnt value(Pbref) based on the value of the internal pressure(Pba) in the intake manifold(33) while said internal combustion engine is in a no-load state, and fixing said addition correction term(Iat) based on the difference between said internal pressure(Pba) in the intake manifold and said learnt value (Pbref) while said internal combustion engine is in a loaded state.
Claim 15
Dependent Claim
40 words
A method according to Claim 12, wherein said learnt value(Pbref) is a function of said internal pressure in the intake manifold existing while said internal combustion engine is in a no-load state and a preceding value of said learnt value.
Claim 16
Dependent Claim
48 words
A method according to Claim 12 ,or Claim 13 , wherein the discrimination between said no-load state and said loaded state is decided on the question as to whether the selector of the automatic transmission of fluid coupling is in the neutral range or in the drive range.
Claim 17
Dependent Claim
25 words
A method according to Claim 12, Claim 13, or Claim 14, wherein said internal pressure(Pba) in the intake manifold(33) is an actually measured value thereof.
Claim 18
Dependent Claim
35 words
A method according to Claim :12, Claim 13, or Claim 14, wherein said internal pressure in the intake manifold is the value obtained by subjecting said actually measured value to correction relative to atmospheric pressure.
Claim 19
Dependent Claim
40 words
A method according to Claim 12, Claim 13, Claim 14, or Claim 16, wherein said internal pressure in the intake manifold is the value obtained by subjecting said actually measured value to correction corresponding to the magnitude of electric load.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.