US5714929A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microprocessor-controlled speedometer/odometer
Assignee: LAICHANG TECHNOLOGY Inc
•
Filing: 1994-12-02
•
Granted: 1998-02-03
•
Expires: 2014-12-02
Abstract
Abstract A microprocessor-controlled speedometer/odometer including a single-chip microprocessor which is previously recorded with operation programs according to different requirements. The programs of the microprocessor are changeable in accordance with the requirements of different speedometers. Additional functions of setting adjustable limited speed, speeding warning and automatically controlling the limited speed are provided by the microprocessor to enhance the usage and accuracy of the speedometer/odometer,
Inventors
- 👤 Paul Liu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:53
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/42; G01P3/44; G01P3/48; G01P3/481; G01P3/489; G01C; G01C22/00; G01C22/02; G01P1/00; G01P1/07; G01P1/08; G01P1/10; G01P1/103; G01P21/00; G01P21/02; G01P3/4802
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
73 words
A microprocessor-controlled speedometer/odometer comprising: a power supply circuit; a decay filter circuit; a clamping circuit for avoiding negative and positive pulses; a reversing amplifier circuit; a microprocessor for receiving signals output from said reversing amplifier circuit and calculating the input signals to obtain the input frequency; a differential circuit for driving a counter of the odometer; a quartz oscillation circuit coupled to the microprocessor; a reset circuit; and a frequency-driver speedometer driving circuit.
Claim 2
Dependent Claim
73 words
A microprocessor-controlled speedometer/odometer comprising: a power supply circuit; a decay filter circuit; a clamping circuit for avoiding negative and positive pulses; a reversing amplifier circuit; a microprocessor for receiving signals output from said reversing amplifier circuit and calculating the input signals to obtain the input frequency; a differential circuit for driving a counter of the odometer; a quartz oscillation circuit coupled to the microprocessor; a reset circuit; and a frequency-driver speedometer driving circuit.
Claim 3
Dependent Claim
24 words
A speedometer/odometer as claimed in claim 1, wherein said microprocessor has previously recorded changeable programs according to different specifications and functions of said speedometer/odometer.
Claim 4
Dependent Claim
25 words
A speedometer/odometer as claimed in claim 1, wherein said microprocessor is operably connected with a limited speed adjusting switch for selectively setting a limited speed.
Claim 5
Dependent Claim
18 words
A speedometer/odometer as claimed in claim 1, wherein said microprocessor is operably connected with a speeding warning means.
Claim 6
Dependent Claim
32 words
A speedometer/odometer as claimed in claim 1, wherein said microprocessor is operably connected with a limited speed automatically controlled means for restricting running speed of a vehicle below a set limited speed.
Claim 7
Dependent Claim
16 words
A speedometer/odometer as claimed in claim 4, wherein said speeding warning means is a light-emitting means.
Claim 8
Dependent Claim
16 words
A speedometer/odometer as claimed in claim 4, wherein said speeding warning means is a sound-emitting means.
Claim 9
Dependent Claim
14 words
A speedometer/odometer as claimed in claim 6, wherein said light-emitting means is an LED.
Claim 10
Dependent Claim
14 words
A speedometer/odometer as claimed in claim 7, wherein said sound-emitting means is a buzzer.
Claim 11
Dependent Claim
15 words
A speedometer/odometer as claimed in claim 7, wherein said sound-emitting means is a speech synthesizer.
Claim 12
Dependent Claim
37 words
A speedometer/odometer as claimed in claim 2, wherein said microprocessor is operably connected with multiple selecting switches of parallel resistors, whereby an assembled sequence of the selecting switches is changeable to alternatively set scales of the speedometer.
Claim 13
Independent Claim
110 words
A system for driving a speedometer to output a vehicle speed reading from electrical speed sensor pulses from a sensor, the system comprising: (a) signal treatment means for amplifying and shaping the sensor pulses; (b) a microprocessor coupled to the means for amplifying and shaping, the microprocessor including division-selection means for selecting a frequency-division ratio, means for frequency-dividing the sensor pulses by the frequency-division ratio to produce output pulses at a lower frequency; (c) a speedometer-driving circuit coupled to the microprocessor and to the speedometer; and (d) power supply means for powering the system; whereby in operation the speedometer displays a speed proportional to a frequency of the sub-divided pulses.
Claim 14
Independent Claim
110 words
A system for driving a speedometer to output a vehicle speed reading from electrical speed sensor pulses from a sensor, the system comprising: (a) signal treatment means for amplifying and shaping the sensor pulses; (b) a microprocessor coupled to the means for amplifying and shaping, the microprocessor including division-selection means for selecting a frequency-division ratio, means for frequency-dividing the sensor pulses by the frequency-division ratio to produce output pulses at a lower frequency; (c) a speedometer-driving circuit coupled to the microprocessor and to the speedometer; and (d) power supply means for powering the system; whereby in operation the speedometer displays a speed proportional to a frequency of the sub-divided pulses.
Claim 15
Dependent Claim
14 words
The system according to claim 12, wherein the speedometer-driving circuit includes a frequency-to-voltage converter.
References Cited (Backward Citations)
US3614615A
Cited
US3950700A
Cited
US3704445A
Cited
US4124840A
Cited
US4314232A
Cited
US4539642A
Cited
US4491007A
Cited
US4742297A
Cited
US5105150A
Cited
US5166610A
Cited
US5265468A
Cited
US5475724A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-02-02 | 2001-08-04 | 2002-02-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-02-02 | 2005-08-04 | 2006-02-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-02-02 | 2009-08-04 | 2010-02-03 | $7700.00 | Window Closed / Lapsed |