US5060611A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process and device for influencing the air feed in an internal-combustion engine, in particular during idling and coasting
Assignee: Robert Bosch GmbH
•
Filing: 1988-11-23
•
Granted: 1991-10-29
•
Expires: 2008-11-23
Abstract
Abstract A process and a device for air proportioning during idling or overrun mode of operation in an internal-combustion engine are provided. During idling, the internal-combustion engine is regulated to a nominal speed by means of a PI controller (203, 204) and a preliminary air rate control value is determined as a function of temperature, gear position and air-conditioning state of the vehicle. At the same time, the actual air mass or air intake rate (60) is measured and the difference value of the actual air intake rate and the preliminary air-rate control value is stored in a store (304). During overrun, the air-mass throughput of the internal-combustion engine is regulated to this stored value. Furthermore, the control receives a series of auxiliary variables which make it easier to carry out the control as a function of the particular operating mode.
Inventors
- 👤 Wolfgang Krampe
- 👤 Gunter Braun
- 👤 Helmut Janetzke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:33
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/16; F02D41/0002; F02D41/0005; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
127 words
Process for air proportioning during idling and overrun modes of operation of an internal combustion engine of a motor vehicle including means for electrically controlling an engine-power adjusting member, comprising the steps of measuring the air intake rate of the engine; determining a preliminary air rate control value in dependency on temperature, drive gear position and air conditioning state of the vehicle; detecting the occurrence of the idling mode of engine operating and, during the idling phase, regulating the engine speed to a nominal value; storing the difference of the air intake rate value measured at the regulated nominal engine speed and the preliminary air rate control value; and, during the overrun phase of the engine, adjusting the intake air rate according to the stored difference value.
Claim 2
Dependent Claim
127 words
Process for air proportioning during idling and overrun modes of operation of an internal combustion engine of a motor vehicle including means for electrically controlling an engine-power adjusting member, comprising the steps of measuring the air intake rate of the engine; determining a preliminary air rate control value in dependency on temperature, drive gear position and air conditioning state of the vehicle; detecting the occurrence of the idling mode of engine operating and, during the idling phase, regulating the engine speed to a nominal value; storing the difference of the air intake rate value measured at the regulated nominal engine speed and the preliminary air rate control value; and, during the overrun phase of the engine, adjusting the intake air rate according to the stored difference value.
Claim 3
Dependent Claim
37 words
Processing according to claim 1, characterized in that the intake air rate is corrected during overrun by means of the preliminary control values, and the stored air-rate value is corrected by means of the preliminary control values.
Claim 4
Dependent Claim
20 words
Process according to claim 1, characterized in that the stored air-rate value is limited to a maximum and/or a minimum.
Claim 5
Dependent Claim
14 words
Process according to claim 1, characterized in that storing takes place in an integrator.
Claim 6
Dependent Claim
38 words
Process according to claim 1, characterized in that the integration speed of the integrator, that is the rate of change of the resulting integral with a constant input signal, is dependent on the sign of the input signal.
Claim 7
Dependent Claim
24 words
Process according to claim 5, characterized in that the integration speed is higher for a negative input signal than for a positive input signal.
Claim 8
Dependent Claim
27 words
Process according to claim 1, characterized in that, during overrun, the stored air-rate value is supplemented via the deceleration-air characteristic as a function of the engine speed.
Claim 9
Dependent Claim
32 words
Process according to claim 1, characterized in that, when the vehicle is in motion, a fixed nominal amount is added to the overrun air for variable additional loads, especially the power-assisted steering.
Claim 10
Dependent Claim
64 words
Process according to claim 1, characterized in that a further fixed amount is added to the overrun air during the activation of the fuel cut off and, when the engine speed falls below a speed threshold between the fuel cut off speed and the restoration speed, is regulated to a fixed value originating from a preliminary engine-speed control and dependent on the nominal speed.
Claim 11
Dependent Claim
38 words
Process according to claim 1, characterized in that the overrun-air rate has added to it a limited engine-speed negative feedback value, the maximum of which is dependent on whether the vehicle has an automatic-transmission or a manual-shift vehicle.
Claim 12
Dependent Claim
47 words
Process according to claim 1, characterized in that the preliminary control value for the air rate is generated smoothly, at least as a function of temperature, transmission or gear-lever position, via a timing element and thereafter as a function of at least one air-conditioning system operating signal.
Claim 13
Dependent Claim
31 words
Process according to claim 11, characterized in that the switching on or off of at least the air-conditioning system operating signal takes place at least partially according to a stepped characteristic.
Claim 14
Dependent Claim
92 words
Process according to claim 1, characterized in that the preliminary control value for the idling speed is formed at least as a function of the parameters of temperature or gear-lever position and a multiplicative increase, when the actual speed is significantly higher than the nominal speed from at least the two parameters, and furthermore at least one air-conditioning system operating signal and a following timing filter for smooth transitions, the time constant of which can be controlled at least as a function of the starting signal and the overrun cut off signal.
Claim 15
Dependent Claim
30 words
Process according to claim 13, characterized in that the air-conditioning system operating signal is linked to a gear lever position signal which gives a lower limitation of the nominal speed.
Claim 16
Dependent Claim
39 words
Process according to claim 1, characterized in that the nominal idling speed value minus the actual speed value during idling is fed to the controlling means for the engine-power adjusting member via at least one P-element and on I-element.
Claim 17
Dependent Claim
30 words
Process according to claim 15, characterized in that the nominal overrun-air value is fed to the controlling means for the engine-power adjusting member during overrun via at least one integrator.
Claim 18
Dependent Claim
69 words
Process according to claim 16, characterized in that the engine power adjusting member is controlled from the idling-speed control during idling and from the overrun-air control during overrun via the same integrator, by feeding to the integrator input one of the control variables or a zero signal, depending on the particular operating mode, so that a smooth transition is guaranteed during transition from one operating mode to the other.
Claim 19
Dependent Claim
70 words
Process according to claim 1, characterized in that the preliminary control value for the air rate is fed constantly to the controlling means for the engine power adjusting member and, in the event of a vehicle speed higher than zero, together with the preliminary control value for the air rate additional engine speed value derived from an overrun air characteristic is fed to the controlling means for the adjusting member.
Claim 20
Dependent Claim
18 words
Process according to claim 18, characterized in that an air mass is used instead of the air rate.
Claim 21
Dependent Claim
33 words
Process according to claim 10, characterized in that, to detect the transmission type, the electrical potential at the starter switch (K1 50) is tapped and discriminated on the side remote from the battery.
Claim 22
Dependent Claim
29 words
Process according to claim 20, characterized in that, in vehicles with a manual gear shift, the engine-speed negative feedback value is limited to lower values than in automatic-transmission vehicles.
Claim 23
Dependent Claim
151 words
Device for air proportioning during idling- and overrun modes of operation of an internal combustion engine of a motor vehicle having means for electrically controlling an engine-power adjusting member, comprising inputs for signals corresponding to actual speed, actual air intake, idling phase, overrun phase, drive gear position, air conditioning state of the vehicle and temperature; and means for engine-speed control, comprising means for producing a preliminary air intake rate control signal in dependency on the temperature- drive gear position- and the air conditioning state signals; means for regulating the engine speed to a nominal idling speed value when an idling phase is detected; means for storing the difference of the actual air intake rate during the nominal idling speed and the preliminary air intake rate control signal; and means for adjusting the air intake rate according to the stored difference of the air intake rate when an overrun phase is detected.
Claim 24
Dependent Claim
151 words
Device for air proportioning during idling- and overrun modes of operation of an internal combustion engine of a motor vehicle having means for electrically controlling an engine-power adjusting member, comprising inputs for signals corresponding to actual speed, actual air intake, idling phase, overrun phase, drive gear position, air conditioning state of the vehicle and temperature; and means for engine-speed control, comprising means for producing a preliminary air intake rate control signal in dependency on the temperature- drive gear position- and the air conditioning state signals; means for regulating the engine speed to a nominal idling speed value when an idling phase is detected; means for storing the difference of the actual air intake rate during the nominal idling speed and the preliminary air intake rate control signal; and means for adjusting the air intake rate according to the stored difference of the air intake rate when an overrun phase is detected.
Claim 25
Dependent Claim
28 words
Device according to claim 22, characterized in that the idling speed regulating means and the overrun-air intake adjusting means is carried out by means of a single integration-controller.
References Cited (Backward Citations)
USRE32030E
Cited
US4531489A
Cited
US4401073A
Cited
US4359982A
Cited
US4432317A
Cited
US4481923A
Cited
US4506641A
Cited
US4729354A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-28 | 1995-04-29 | 1995-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-28 | 1999-04-29 | 1999-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-28 | 2003-04-29 | 2003-10-29 | $7700.00 | Window Closed / Lapsed |