US6063004A
Expired / Lapsed
US
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Control apparatus and control method for an engine powertrain of a vehicle
Assignee: Hitachi Ltd
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Filing: 1997-12-01
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Granted: 2000-05-16
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Expires: 2017-12-01
Abstract
Abstract A control apparatus and control method for an engine powertrain of a vehicle including a CVT type automatic transmission and a lean burn engine. The control apparatus is designed to compute an engine torque in a stoichiometric area or a lean burn area, calculate an output torque from a present transmission ratio and a present torque ratio, calculate a transmission ratio change so that the output torque approximates a target torque, and vary the transmission ratio. With this configuration, shock due to steps in the output torque can be prevented to obtain a comfortable acceleration feeling.
Inventors
- 👤 Masahiko Ibamoto
- 👤 Hiroshi Kuroiwa
- 👤 Kazuhiko Sato
- 👤 Toshimichi Minowa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:32
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/66; F16H61/662; F16H61/66254; F16H59/00; F16H59/14
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
100 words
A control apparatus for an engine powertrain of a vehicle including an engine and a CVT type automatic transmission in which a transmission ratio is continuously variable, wherein said control apparatus is configured to compute a deviation between a target value of an output torque of said vehicle based on an accelerator pedal depression amount and a vehicle speed, and a present value of said output torque based on an engine torque of said engine and a present value of said transmission ratio of said transmission and decide said transmission ratio according to said deviation of said computed output torque.
Claim 2
Dependent Claim
100 words
A control apparatus for an engine powertrain of a vehicle including an engine and a CVT type automatic transmission in which a transmission ratio is continuously variable, wherein said control apparatus is configured to compute a deviation between a target value of an output torque of said vehicle based on an accelerator pedal depression amount and a vehicle speed, and a present value of said output torque based on an engine torque of said engine and a present value of said transmission ratio of said transmission and decide said transmission ratio according to said deviation of said computed output torque.
Claim 3
Dependent Claim
117 words
A control apparatus for an engine powertrain of a vehicle including an engine and a CVT type automatic transmission in which a transmission ratio is continuously variable, wherein said control apparatus recognizes a present value of said transmission ratio, computes a target output torque as a target value of an output torque of said vehicle according to an accelerator pedal depression amount and a vehicle speed, computes an engine torque of said engine, computes a present output torque according to said computed engine torque and said present value of said recognized transmission ratio, and decides said transmission ratio of said transmission according to a deviation between said computed target output torque and said computed present output torque.
Claim 4
Dependent Claim
117 words
A control apparatus for an engine powertrain of a vehicle including an engine and a CVT type automatic transmission in which a transmission ratio is continuously variable, wherein said control apparatus recognizes a present value of said transmission ratio, computes a target output torque as a target value of an output torque of said vehicle according to an accelerator pedal depression amount and a vehicle speed, computes an engine torque of said engine, computes a present output torque according to said computed engine torque and said present value of said recognized transmission ratio, and decides said transmission ratio of said transmission according to a deviation between said computed target output torque and said computed present output torque.
Claim 5
Dependent Claim
51 words
A control apparatus according to claim 2, wherein said control apparatus generates a signal for controlling a combustion condition of said engine to a complete combustion condition corresponding to a stoichiometric air-fuel ratio when said accelerator pedal depression amount exceeds a predetermined value and varies said transmission ratio in decreasing direction.
Claim 6
Dependent Claim
72 words
A control apparatus according to claim 3, wherein said control apparatus further generates a signal for changing the combustion condition of said engine from said complete combustion condition corresponding to said stoichiometric air-fuel ratio to a lean burn condition corresponding to a lean air-fuel ratio when said accelerator pedal depression amount exceeds a predetermined value and a predetermined period of time has elapsed and varies said transmission ratio in its increasing direction.
Claim 7
Dependent Claim
78 words
A control apparatus according to claim 3, wherein said control apparatus further generates a signal for changing the combustion condition of said engine from said complete combustion condition corresponding to said stoichiometric air-fuel ratio to a lean burn condition corresponding to a lean air-fuel ratio when said accelerator pedal depression amount exceeds a predetermined value and a change rate of said vehicle speed becomes a predetermined value or less and varies said transmission ratio in its increasing direction.
Claim 8
Dependent Claim
100 words
A control method for an engine powertrain of a vehicle including an engine and a CVT type automatic transmission in which a transmission ratio is continuously variable, comprising the steps of: computing a deviation between a target value of an output torque of said vehicle based on an accelerator pedal depression amount and a vehicle speed, and a present value of said output torque based on an engine torque of said engine and a present value of said transmission ratio of said transmission; and deciding said transmission ratio of said transmission according to said deviation of said output torque computed.
Claim 9
Dependent Claim
100 words
A control method for an engine powertrain of a vehicle including an engine and a CVT type automatic transmission in which a transmission ratio is continuously variable, comprising the steps of: computing a deviation between a target value of an output torque of said vehicle based on an accelerator pedal depression amount and a vehicle speed, and a present value of said output torque based on an engine torque of said engine and a present value of said transmission ratio of said transmission; and deciding said transmission ratio of said transmission according to said deviation of said output torque computed.
Claim 10
Dependent Claim
122 words
A control method for an engine powertrain of a vehicle including an engine and a CVT type automatic transmission in which a transmission ratio is continuously variable, comprising the steps of: recognizing a present value of said transmission ratio; computing a target output torque as a target value of an output torque of said vehicle according to an accelerator pedal depression amount and a vehicle speed; computing an engine torque according to a combustion condition of said engine; computing a present output torque according to said engine torque computed and said present value of said transmission ratio recognized; and deciding said transmission ratio of said transmission according to a deviation between said target output torque computed and said present output torque computed.
Claim 11
Dependent Claim
122 words
A control method for an engine powertrain of a vehicle including an engine and a CVT type automatic transmission in which a transmission ratio is continuously variable, comprising the steps of: recognizing a present value of said transmission ratio; computing a target output torque as a target value of an output torque of said vehicle according to an accelerator pedal depression amount and a vehicle speed; computing an engine torque according to a combustion condition of said engine; computing a present output torque according to said engine torque computed and said present value of said transmission ratio recognized; and deciding said transmission ratio of said transmission according to a deviation between said target output torque computed and said present output torque computed.
Claim 12
Dependent Claim
53 words
A control method according to claim 7, further comprising the step of generating a signal for controlling the combustion condition of said engine to a complete combustion condition corresponding to a stoichiometric air-fuel ratio when said accelerator pedal depression amount exceeds a predetermined value; said transmission ratio being varied in its decreasing direction.
Claim 13
Dependent Claim
72 words
A control method according to claim 8, further comprising the step of generating a signal for changing the combustion condition of said engine from said complete combustion condition corresponding to said stoichiometric air-fuel ratio to a lean burn condition corresponding to a lean air-fuel ratio when said accelerator pedal depression amount exceeds a predetermined value and a predetermined period of time has elapsed; said transmission ratio being varied in its increasing direction.
Claim 14
Dependent Claim
78 words
A control method according to claim 8, further comprising the step of generating a signal for changing the combustion condition of said engine from said complete combustion condition corresponding to said stoichiometric air-fuel ratio to a lean burn condition corresponding to a lean air-fuel ratio when said accelerator pedal depression amount exceeds a predetermined value and a change rate of said vehicle speed becomes a predetermined value or less; said transmission ratio being varied in its increasing direction.
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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) | 2003-05-16 | 2003-11-15 | 2004-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-05-16 | 2007-11-15 | 2008-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-05-16 | 2011-11-15 | 2012-05-16 | $7700.00 | Window Closed / Lapsed |