Patent US4759212A successfully refreshed from Google Patents.
US4759212A
Expired / Lapsed
US
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Abnormality determination device for a vehicle speed sensor
Assignee: Toyota Motor Corp
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Filing: 1986-12-01
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Granted: 1988-07-26
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Expires: 2006-12-01
Abstract
Abstract Provided is an abnormality determination device for a vehicle speed sensor which can prevent a memory unit from storing the erroneous result of abnormality determination of a vehicle speed sensor due to the engine racing when the vehicle is stationary. The device of the invention includes a revolution speed sensor for detecting a revolution speed of an output shaft of an automatic transmission and generating a speed signal, abnormality determination elements for inputting the speed signal of the revolution speed sensor and for determining if the revolution speed sensor is abnormal and for generating an abnormality signal in response to the determined result, a memory for storing the abnormality signal, and halt elements for preventing the memory from storing the abnormality signal when the automatic transmission is set at a neutral position or at a parking position.
Inventors
- 👤 Kazuhisa Sawada
- 👤 Tatsuo Teratani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:39
CPC Classifications
G; G01; G01M; G01M15/00; G01M15/04; G01M15/042; G01M15/046; G01P; G01P21/00; G01P21/02; F; F02; F02D; F02D2200/00; F02D2200/02; F02D2200/10; F02D2200/1015
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
113 words
An abnormality determination device for a vehicle speed sensor, said abnormality determination device comprising: (a) a first revolution speed sensor for detecting a revolution speed of an output shaft of an automatic transmission and for generating a speed signal; (b) abnormality determination means for inputting the speed signal of said first revolution speed sensor, for determining if said first revolution speed sensor is abnormal, and for generating an abnormality signal in response to the determined result; (c) storage means for storing the abnormality signal; and (d) halt means for preventing said storage means from storing the abnormality signal when the automatic transmission is set at a neutral position or at a parking position.
Claim 2
Dependent Claim
113 words
An abnormality determination device for a vehicle speed sensor, said abnormality determination device comprising: (a) a first revolution speed sensor for detecting a revolution speed of an output shaft of an automatic transmission and for generating a speed signal; (b) abnormality determination means for inputting the speed signal of said first revolution speed sensor, for determining if said first revolution speed sensor is abnormal, and for generating an abnormality signal in response to the determined result; (c) storage means for storing the abnormality signal; and (d) halt means for preventing said storage means from storing the abnormality signal when the automatic transmission is set at a neutral position or at a parking position.
Claim 3
Dependent Claim
53 words
An abnormality determination device for a vehicle speed sensor as claimed in claim 1, wherein said first abnormality determination means determines the abnormality of said first revolution speed sensor when the vehicle is determined to be stationary by a vehicle speed sensor and said first revolution speed sensor generates a non-zero speed signal.
Claim 4
Dependent Claim
63 words
An abnormality determination device for a vehicle speed sensor as claimed in claim 2, wherein said first revolution speed sensor comprises a magnet attached to the output shaft of the automatic transmission and a reed switch attached on the body of the vehicle, said reed switch generating a pulse signal with access of a pole of said magnet rotated with the output shaft.
Claim 5
Dependent Claim
65 words
An abnormality determination device for a vehicle speed sensor as claimed in claim 2, wherein said first revolution speed sensor comprises a gear attached to the output shaft of the automatic transmission and an electromagnetic pickup unit attached on the body of the vehicle, said pickup unit generating a pulse signal with an access of a tooth of said gear rotated with the output shaft.
Claim 6
Dependent Claim
23 words
An abnormality determination device for a vehicle speed sensor as claimed in claim 2, wherein said storage means is an electronic memory device.
Claim 7
Dependent Claim
147 words
An abnormality determination device for a vehicle speed sensor, said abnormality determination device comprising: (a) a first revolution speed sensor for detecting a revolution speed of an output shaft of an automatic transmission and for generation a speed signal; (b) a second revolution speed sensor for generating a speed signal; (c) abnormality determination means for inputting the speed signals of said first and second speed sensors, for determining the abnormality of either one of said first and second revolution speed sensors when the difference of the speed signals between said two sensors is greater than a preset value, and for generating an abnormality signal in response to the determined result; (d) storage means for storing the abnormality signal; and (e) halt means for preventing said storage means from storing the abnormality signal when the automatic transmission is set at a neutral position or at a parking position.
Claim 8
Dependent Claim
147 words
An abnormality determination device for a vehicle speed sensor, said abnormality determination device comprising: (a) a first revolution speed sensor for detecting a revolution speed of an output shaft of an automatic transmission and for generation a speed signal; (b) a second revolution speed sensor for generating a speed signal; (c) abnormality determination means for inputting the speed signals of said first and second speed sensors, for determining the abnormality of either one of said first and second revolution speed sensors when the difference of the speed signals between said two sensors is greater than a preset value, and for generating an abnormality signal in response to the determined result; (d) storage means for storing the abnormality signal; and (e) halt means for preventing said storage means from storing the abnormality signal when the automatic transmission is set at a neutral position or at a parking position.
Claim 9
Dependent Claim
63 words
An abnormality determination device for a vehicle speed sensor as claimed in claim 6, wherein said first revolution speed sensor comprises a magnet attached to the output shaft of the automatic transmission and a reed switch attached on the body of the vehicle, said reed switch generating a pulse signal with access of a pole of said magnet rotated with the output shaft.
Claim 10
Dependent Claim
65 words
An abnormality determination device for a vehicle speed sensor as claimed in claim 6, wherein said first revolution speed sensor comprises a gear attached to the output shaft of the automatic transmission and an electromagnetic pickup unit attached on the body of the vehicle, said pickup unit generating a pulse signal with an access of a tooth of said gear rotated with the output shaft.
Claim 11
Dependent Claim
32 words
An abnormality determination device for a vehicle speed sensor as claimed in claim 6, wherein said storage means is a constituent of a self diagnosis device for an electronic controlled automatic transmission.
Claim 12
Dependent Claim
23 words
An abnormality determination device for a vehicle speed sensor as claimed in claim 6, wherein said storage means is an electronic memory device.
Claim 13
Dependent Claim
167 words
An abnormality determination device for a vehicle speed sensor, said abnormality determination device comprising: (a) a first revolution speed sensor for detecting a revolution speed of an output shaft of an automatic transmission and for generating a speed signal; (b) abnormality determination means for inputting the speed signal of said first revolution speed sensor, for determining if said first revolution speed sensor is abnormal, and for generating an abnormality signal in response to the determined result, said abnormality determination means determining the abnormality of said first revolution speed sensor when the vehicle is determined to be stationary by a vehicle speed sensor and said first revolution speed sensor generates a non-zero speed signal; (c) storage means for storing the abnormality signal, said storage means being a constituent of a self diagnosis device for an electronic controlled automatic transmission; and (e) halt means for preventing said storage means from storing the abnormality signal when the automatic transmission is set at a neutral position or at a parking position.
Claim 14
Dependent Claim
167 words
An abnormality determination device for a vehicle speed sensor, said abnormality determination device comprising: (a) a first revolution speed sensor for detecting a revolution speed of an output shaft of an automatic transmission and for generating a speed signal; (b) abnormality determination means for inputting the speed signal of said first revolution speed sensor, for determining if said first revolution speed sensor is abnormal, and for generating an abnormality signal in response to the determined result, said abnormality determination means determining the abnormality of said first revolution speed sensor when the vehicle is determined to be stationary by a vehicle speed sensor and said first revolution speed sensor generates a non-zero speed signal; (c) storage means for storing the abnormality signal, said storage means being a constituent of a self diagnosis device for an electronic controlled automatic transmission; and (e) halt means for preventing said storage means from storing the abnormality signal when the automatic transmission is set at a neutral position or at a parking position.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-26 | 1992-01-25 | 1992-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-26 | 1996-01-25 | 1996-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-26 | 2000-01-25 | 2000-07-26 | $7700.00 | Window Closed / Lapsed |