US4938604A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vehicle speed control device
Assignee: Mitsubishi Electric Corp
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Filing: 1988-06-27
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Granted: 1990-07-03
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Expires: 2008-06-27
Abstract
Abstract A vehicle speed control device for holding a vehicle speed constant includes a control amount integrating means for simulating a variation of driving force by integrating the control amount time and a gear change judging means responsive to a speed deviation between an actual speed and a desired speed and an integrated amount for providing a signal to an automatic transmission means for changing the gear ratio when the deviation or the integrated amount exceeds a predetermined value and returning the gear ratio when the deviation or the integrated amount becomes lower than the predetermined value.
Inventors
- 👤 Yasuo Naito
- 👤 Akihiko Mori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:48
CPC Classifications
B; B60; B60K; B60K31/00; B60K31/06; B60K31/10; B60K31/102; B60K31/105; B60K31/107
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
184 words
A running speed control device for holding a running speed of a vehicle at a constant level, said device comprising: a running speed detector for providing a running speed signal corresponding to said running speed; an acceleration detector for receiving said running speed signal at a predetermined time interval to provide an acceleration signal; means for setting a desired speed signal which corresponds to said desired constant speed level; means for providing a speed deviation signal representing a speed deviation between said running speed and said constant speed level in response to said running speed signal and said desired speed signal; means for providing a control signal based on said acceleration signal and said speed deviation signal; driving force means responsive to said control signal to change a driving power of the vehicle such that the running speed becomes equal to the desired constant speed level; means for integrating said control signal on a time basis to simulate a variation of said driving power; and automatic transmission means for changing a gear ratio in response to said integrating means and said speed deviation signal.
Claim 2
Dependent Claim
184 words
A running speed control device for holding a running speed of a vehicle at a constant level, said device comprising: a running speed detector for providing a running speed signal corresponding to said running speed; an acceleration detector for receiving said running speed signal at a predetermined time interval to provide an acceleration signal; means for setting a desired speed signal which corresponds to said desired constant speed level; means for providing a speed deviation signal representing a speed deviation between said running speed and said constant speed level in response to said running speed signal and said desired speed signal; means for providing a control signal based on said acceleration signal and said speed deviation signal; driving force means responsive to said control signal to change a driving power of the vehicle such that the running speed becomes equal to the desired constant speed level; means for integrating said control signal on a time basis to simulate a variation of said driving power; and automatic transmission means for changing a gear ratio in response to said integrating means and said speed deviation signal.
Claim 3
Dependent Claim
60 words
A running speed control device as claimed in claim 1, wherein said automatic transmission means comprises: means for changing the gear ratio when the speed deviation or the integrated amount exceeds a predetermined value; and means for returning said changed gear ratio to the previous gear ratio when the speed deviation or the integrated amount falls below said predetermined value.
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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) | 1993-07-02 | 1994-01-01 | 1994-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-07-02 | 1998-01-01 | 1998-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-07-02 | 2002-01-01 | 2002-07-03 | $7700.00 | Window Closed / Lapsed |