Patent US5813387A successfully refreshed from Google Patents.
US5813387A
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US
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Change gear control device using acceleration and gear ratio as parameters for automatic transmission in a motor vehicle and the method therefor
Assignee: Hitachi Ltd
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Filing: 1996-12-27
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Granted: 1998-09-29
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Expires: 2016-12-27
Abstract
Abstract A change gear control device is provided for an automatic transmission in a motor vehicle propelled by an internal combustion engine which is operated with an air/fuel mixture having air/fuel ratios ranging from a fuel rich air/fuel ratio to a fuel lean air/fuel ratio depending on driving conditions of the motor vehicle. In this device a first detector detects an engine torque of the internal combustion engine and a second detector detects a vehicle speed of the motor vehicle. A processor processes transmission gear ratios for the automatic transmission. In particular, the processor reads the detected engine torque from the first detector and the detected vehicle speed from the second detector, determines a new transmission gear ratio based upon the engine torque and the vehicle speed, and outputs a signal representing the new transmission gear ratio to the automatic transmission, whereby a gear shifting operation is effected at a timing based on an engine torque variation due to an operating air/fuel ratio change.
Inventors
- 👤 Toshimichi Minowa
- 👤 Hiroshi Kimura
- 👤 Yoshiyuki Yoshida
- 👤 Yoshishige Ohyama
- 👤 Yutaka Nishimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:05
CPC Classifications
F; F16; F16H; F16H59/00; F16H59/48; B; B60; B60W; B60W10/00; B60W10/04; B60W10/06; B60W10/10; B60W10/11; B60W10/115; B60W30/00; B60W30/18; B60W30/1819; F02; F02D; F02D41/00; F02D41/02; F02D41/021; F02D41/0215; F02D41/023; F16H61/00; F16H61/02; F16H61/0202; F16H61/0204; F16H61/0213; B60W2710/00; B60W2710/06; B60W2710/0616; B60W2710/0622; F02D2200/00; F02D2200/50; F02D2200/501; F02D2400/00; F02D2400/12; F02D41/0225; F16H2061/0018; F16H2306/00; F16H2306/40; F16H2306/42; F16H59/14; F16H59/36; F16H59/44; F16H61/16; F16H63/00; F16H63/40; F16H63/50; F16H63/502; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
102 words
A method of controlling an internal combustion engine of a motor vehicle which is operated with air fuel mixture gas having air fuel ratio ranging from a fuel rich air fuel ratio to a fuel lean air fuel ratio depending on driving conditions of the motor vehicle and which is equipped with an automatic transmission of which transmission speed ratio change is determined based on a vehicle speed and an engine torque comprising the steps of: detecting an instant when air fuel ratio is changed; and changing air flow rate for the detected instant to reduce NOx density exhausted from the engine.
Claim 2
Independent Claim
102 words
A method of controlling an internal combustion engine of a motor vehicle which is operated with air fuel mixture gas having air fuel ratio ranging from a fuel rich air fuel ratio to a fuel lean air fuel ratio depending on driving conditions of the motor vehicle and which is equipped with an automatic transmission of which transmission speed ratio change is determined based on a vehicle speed and an engine torque comprising the steps of: detecting an instant when air fuel ratio is changed; and changing air flow rate for the detected instant to reduce NOx density exhausted from the engine.
Claim 3
Dependent Claim
61 words
The method according to claim 1, wherein said step of changing air flow rate for the detected instant to reduce NOx density exhausted from the engine changes the air flow rate as a function of an estimated actual fuel amount in a cylinder of said internal combustion engine, a present target air fuel ratio, and a previous target air fuel ratio.
Claim 4
Independent Claim
159 words
A method of controlling an internal combustion engine of a motor vehicle which is operated with air fuel mixture gas having air fuel ratio ranging from a fuel rich air fuel ratio to a fuel lean air fuel ratio depending on driving conditions of the motor vehicle and which is equipped with an automatic transmission of which transmission speed ratio change is determined based on a vehicle speed and an engine torque comprising the steps of: detecting an instant when air fuel ratio is changed; estimating an actual fuel amount introduced in a cylinder of the engine; calculating a target air flow rate for the detected air fuel ratio changing instant based on the estimated actual fuel amount; and determining opening degree of an idle speed control valve based on the calculated target air flow rate so as to change the air flow rate during detected air fuel ratio changing instant to reduce NOx density exhausted from the engine.
Claim 5
Independent Claim
159 words
A method of controlling an internal combustion engine of a motor vehicle which is operated with air fuel mixture gas having air fuel ratio ranging from a fuel rich air fuel ratio to a fuel lean air fuel ratio depending on driving conditions of the motor vehicle and which is equipped with an automatic transmission of which transmission speed ratio change is determined based on a vehicle speed and an engine torque comprising the steps of: detecting an instant when air fuel ratio is changed; estimating an actual fuel amount introduced in a cylinder of the engine; calculating a target air flow rate for the detected air fuel ratio changing instant based on the estimated actual fuel amount; and determining opening degree of an idle speed control valve based on the calculated target air flow rate so as to change the air flow rate during detected air fuel ratio changing instant to reduce NOx density exhausted from the engine.
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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) | 2001-09-28 | 2002-03-30 | 2002-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-09-28 | 2006-03-30 | 2006-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-09-28 | 2010-03-30 | 2010-09-29 | $7700.00 | Window Closed / Lapsed |