Patent US4539641A successfully refreshed from Google Patents.
US4539641A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Data processor in automobiles
Assignee: Hitachi Ltd
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Filing: 1982-03-23
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Granted: 1985-09-03
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Expires: 2002-03-23
Abstract
Abstract A data handling system for an automobile comprises an odometric data generator which provides odometric data corresponding to the travel distance of the automobile. A nonvolatile memory stores total odometric data, an adder receives the odometric data provided from the odometric data generator and the previous total odometric data provided from the nonvolatile memory, and a control circuit controls the writing of data into the nonvolatile memory in accordance with the state of a key switch. The adder receives the present odometric data and the previous odometric data, to thereby provide total odometric data up to the present time. This total odometric data is displayed by an appropriate display device. In response to the turn-off of the key switch, the total odometric data provided from the adder is written into the nonvolatile memory. Thus, an odometer can be implemented in electronic circuit form.
Inventors
- 👤 Norishige Kawashimo
- 👤 Joe Nakajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:43
CPC Classifications
G; G01; G01D; G01D9/00; G01D9/28; G07; G07C; G07C5/00; G07C5/08; G07C5/0816; G07C5/0825
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
208 words
For use in a processor-based control system associated with a vehicle, said vehicle having sensors generating signals representative of prescribed conditions of the vehicle, a data handling system comprising: an electrically erasable and programmable read only memory; means, coupled to said electrically erasable and programmable read only memory and said sensors, for generating data indicative of a condition of said vehicle in response to signals generated by said sensors and causing said data to be written into said electrically erasable and programmable read only memory; a control switch, the operation of which governs the operation of said data handling system, wherein said means for generating data comprises means for causing said data to be written into said memory in response to the turning-off of said control switch; switching means for controlling the supply of power for said electrically erasable and programmable read only memory; and control means, coupled to said switch means and responsive to the operation of said control switch, for causing said switching means to supply power to said electrically erasable and programmable read only memory for a prescribed period of time subsequent to the turning-off of said control switch after which prescribed period of time the supply of power to said memory is cut off.
Claim 2
Dependent Claim
208 words
For use in a processor-based control system associated with a vehicle, said vehicle having sensors generating signals representative of prescribed conditions of the vehicle, a data handling system comprising: an electrically erasable and programmable read only memory; means, coupled to said electrically erasable and programmable read only memory and said sensors, for generating data indicative of a condition of said vehicle in response to signals generated by said sensors and causing said data to be written into said electrically erasable and programmable read only memory; a control switch, the operation of which governs the operation of said data handling system, wherein said means for generating data comprises means for causing said data to be written into said memory in response to the turning-off of said control switch; switching means for controlling the supply of power for said electrically erasable and programmable read only memory; and control means, coupled to said switch means and responsive to the operation of said control switch, for causing said switching means to supply power to said electrically erasable and programmable read only memory for a prescribed period of time subsequent to the turning-off of said control switch after which prescribed period of time the supply of power to said memory is cut off.
Claim 3
Dependent Claim
50 words
A system according to claim 1, wherein said means comprises means, responsive to the turning-on of said control switch, for generating data indicative of a condition of the vehicle on the basis of signals generated by said sensors and data stored in said electrically erasable and programmable read only memory.
Claim 4
Dependent Claim
49 words
A system according to claim 1, wherein said sensors include sensor means for generating signals representative of the travel distance of said vehicle and said means includes means for generating data representative of the total travel distance of said vehicle in response to the turning-off of said control switch.
Claim 5
Dependent Claim
58 words
A system according to claim 1, wherein said data writing causing means comprises means, responsive to the turning-off of said control switch for causing a portion of said data to be written into those memory addresses the contents of which provided a basis for the generation of said data in response to the turning-on of said control switch.
Claim 6
Independent Claim
35 words
A system according to one of claims 1 and 2, further comprising display means, coupled to said data generation means, for displaying prescribed information in accordance with the data generated by said data generation means.
Claim 7
Dependent Claim
64 words
A system according to claim 1, wherein said vehicle includes sensor means generating signals representative of preselected operational conditions of the vehicle and wherein said data handling system further comprises additional memory; and means, coupled to said sensor means, for generating further data representative of said preselected operational conditions of the engine and causing said further data to be written into said additional memory.
Claim 8
Dependent Claim
40 words
A system according to claim 6, wherein said further data writing causing means includes means, coupled to said memory, for causing prescribed data stored in said electrically erasable and programmable read only memory to be written into said additional memory.
Claim 9
Dependent Claim
26 words
A system according to claim 11, further comprising display means, coupled to said additional memory, for displaying prescribed information in accordance with the data stored therein.
Claim 10
Dependent Claim
19 words
A system according to claim 8, wherein said prescribed data is representative of the travel distance of said vehicle.
Claim 11
Dependent Claim
22 words
A system according to claim 9, wherein said preselected operational conditions correspond to a condition of fuel remaining in a fuel tank.
References Cited (Backward Citations)
US3780272A
Cited
US4072850A
Cited
US4053749A
Cited
US4184205A
Cited
US4250402A
Cited
US4258421A
Cited
US4371934A
Cited
US4400783A
Cited
US4409663A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |