US6006724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine throttle control apparatus
Assignee: Nissan Motor Co Ltd
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Filing: 1998-06-23
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Granted: 1999-12-28
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Expires: 2018-06-23
Abstract
Abstract The invention ensures that a vehicle responds in accordance with a driver's expectations during negative pressure control (or boost control). A negative pressure control target intake air flow rate is calculated. This air flow rate ensures that the pressure in a cylinder does not drop too low (which could increase oil leakage into the cylinder). A greater one of an ISC (idle speed control) target torque and a negative pressure control target intake air flow rate torque-converted value is selected. The selected torque is set as an engine demand torque. The engine demand torque is combined with a driver demand torque to calculate a target torque. The throttle valve is controlled in an electronic manner based on the target torque.
Inventors
- 👤 Nobutaka Takahashi
- 👤 Yoshitaka Deguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:43
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D11/00; F02D11/06; F02D11/10; F02D11/105; F02D31/00; F02D31/001; F02D31/002; F02D31/003; F02D35/00; F02D35/0015; F02D35/0023; F02D41/0002; F02D41/0005; F02D2011/101; F02D2011/102; F02D2200/00; F02D2200/02; F02D2200/04; F02D2200/0402; F02D2200/0406; F02D2200/10; F02D2200/1002; F02D2200/1004; F02D2250/00; F02D2250/18; F02D2250/41; F02D35/02; F02D35/023; F02D41/30; F02D41/3011; F02D41/3017; F02D41/3023; F02D41/3029; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
128 words
An engine throttle controller for a vehicle having an engine, the controller comprising: a driver's demand torque calculation section to calculate a driver's demand torque that corresponds to a driver's request based on at least accelerator position; an engine demand torque calculation section to calculate a first parameter representing a torque that the engine requires irrespective of a driver's accelerator request; a minimum air flow calculation section to calculate a second parameter representing a minimum air flow into the engine; a selection section to select a greater one of the first parameter and the second parameter; and a combination section to combine the driver's demand torque with a torque corresponding to the parameter selected by the selection section to produce a target torque to control engine air intake.
Claim 2
Dependent Claim
128 words
An engine throttle controller for a vehicle having an engine, the controller comprising: a driver's demand torque calculation section to calculate a driver's demand torque that corresponds to a driver's request based on at least accelerator position; an engine demand torque calculation section to calculate a first parameter representing a torque that the engine requires irrespective of a driver's accelerator request; a minimum air flow calculation section to calculate a second parameter representing a minimum air flow into the engine; a selection section to select a greater one of the first parameter and the second parameter; and a combination section to combine the driver's demand torque with a torque corresponding to the parameter selected by the selection section to produce a target torque to control engine air intake.
Claim 3
Dependent Claim
23 words
A controller as set forth in claim 1, wherein the second parameter represents a minimum air flow into the engine for boost control.
Claim 4
Dependent Claim
17 words
A controller as set forth in claim 1, wherein the controller controls an electronically controlled throttle valve.
Claim 5
Dependent Claim
18 words
A controller as set forth in claim 1, wherein the first parameter and the second parameter are torques.
Claim 6
Dependent Claim
20 words
A controller as set forth in claim 1, wherein the first parameter and the second parameter are air flow rates.
Claim 7
Dependent Claim
34 words
A controller as set forth in claim 1, wherein the combination section adds the driver's demand torque to a torque corresponding to the parameter selected by the selection section to produce said target torque.
Claim 8
Dependent Claim
30 words
A controller as set forth in claim 1, wherein the minimum air flow calculation section calculates the second parameter based at least in part on a variable target air-fuel ratio.
Claim 9
Dependent Claim
30 words
A controller as set forth in claim 1, wherein the engine demand torque calculation section calculates the first parameter such that engine idle speed is maintained during engine idle control.
Claim 10
Dependent Claim
30 words
A controller as set forth in claim 2, wherein the minimum air flow calculation section calculates the second parameter based at least in part on a variable target air-fuel ratio.
Claim 11
Dependent Claim
30 words
A controller as set forth in claim 9, wherein the engine demand torque calculation section calculates the first parameter such that engine idle speed is maintained during engine idle control.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-12-27 | 2003-06-28 | 2003-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-12-27 | 2007-06-28 | 2007-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-12-27 | 2011-06-28 | 2011-12-28 | $7700.00 | Window Closed / Lapsed |