US5161634A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric vehicle
Assignee: Kubota Corp
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Filing: 1991-03-18
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Granted: 1992-11-10
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Expires: 2011-03-18
Abstract
Abstract An electric vehicle that runs at a speed controlled by adjusting power supply to an electric motor in response to a speed setting signal from a speed setting device including an accelerator lever and a change speed lever. This vehicle comprises a first control unit for producing a target speed value based on the speed setting signal, a second control unit for controlling the electric motor, and a rotary encoder for detecting an actual vehicle speed from rotation of the electric motor and feeding the vehicle speed back to the first and second control units. The first control unit compares the target speed value and actual vehicle speed and, when a difference therebetween exceeds a predetermined value, varies the target speed value for application to the second control unit. The second control unit compares the target speed value and actual vehicle speed and determines an amount of power supply to the electric motor.
Inventors
- 👤 Masahiro Ichihara
- 👤 Shigenori Kimura
- 👤 Yasuhiro Yamamoto
- 👤 Jiro Kuramoto
- 👤 Naoaki Sato
- 👤 Gonshiro Kawabata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:53
CPC Classifications
B; B62; B62K; B62K5/00; B62K5/02; B62K5/023; B62K5/025; B60; B60K; B60K31/00; B60K31/02; B60K31/04; B60K31/042; B60K31/045; B60K31/047; B60L; B60L15/00; B60L15/20; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/72; Y10; Y10S; Y10S180/00; Y10S180/907
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
194 words
An electric vehicle that runs at a speed controlled by adjusting power supply to an electric motor in response to a speed setting signal from speed setting means, comprising: first control means for producing a target speed value based on said speed setting signal from said speed setting means, second control means for adjusting power supply to said electric motor and in which said target speed value produced by said first control means is inputted, vehicle speed detecting means for detecting a vehicle speed and outputting a vehicle speed signal, a first feedback line for transmitting said vehicle speed signal to said first control means, and a second feedback line for transmitting said vehicle speed signal to said second control means, wherein said first control means includes target value varying means for comparing said target speed value and said vehicle speed signal and, when a difference therebetween exceeds a predetermined value, varying said target speed value, and said second control means includes power supply setting means for comparing said target speed value inputted from said first control means and said vehicle speed signal and determining an amount of power supply to said electric motor.
Claim 2
Dependent Claim
194 words
An electric vehicle that runs at a speed controlled by adjusting power supply to an electric motor in response to a speed setting signal from speed setting means, comprising: first control means for producing a target speed value based on said speed setting signal from said speed setting means, second control means for adjusting power supply to said electric motor and in which said target speed value produced by said first control means is inputted, vehicle speed detecting means for detecting a vehicle speed and outputting a vehicle speed signal, a first feedback line for transmitting said vehicle speed signal to said first control means, and a second feedback line for transmitting said vehicle speed signal to said second control means, wherein said first control means includes target value varying means for comparing said target speed value and said vehicle speed signal and, when a difference therebetween exceeds a predetermined value, varying said target speed value, and said second control means includes power supply setting means for comparing said target speed value inputted from said first control means and said vehicle speed signal and determining an amount of power supply to said electric motor.
Claim 3
Dependent Claim
95 words
An electric vehicle as claimed in claim 1, wherein said target value varying means is operable to add a correction value to said target speed value based on said speed setting signal for application to said second control means when said vehicle speed signal is less than said target speed value by a predetermined value, and to subtract the correction value from said target speed value based on said speed setting signal for application to said second control means when said vehicle speed signal is greater than said target speed value by the predetermined value.
Claim 4
Dependent Claim
69 words
An electric vehicle as claimed in claim 2, wherein said speed setting means includes an accelerator lever for setting speeds steplessly, and a change speed lever for selecting a desired one of a plurality of stages, said first control means being operable to vary methods of computing the target speed value and correction value based on a value set by said accelerator lever in accordance with a selected stage.
Claim 5
Dependent Claim
47 words
An electric vehicle as claimed in claim 1, further comprising an auxiliary brake, wherein said first control means is operable to output a target speed value signal for zero speed value and at the same time output a brake operating signal to said auxiliary brake as well.
Claim 6
Dependent Claim
38 words
An electric vehicle as claimed in claim 4, wherein said auxiliary brake is a negative brake releasable by an electromagnetic force and, when the electromagnetic force is removed, operable to apply a braking force by a mechanical means.
Claim 7
Dependent Claim
15 words
An electric vehicle as claimed in claim 5, wherein said mechanical means is a spring.
Claim 8
Dependent Claim
46 words
An electric vehicle as claimed in claim 4, further comprising hand brake means, wherein said hand brake means includes braking operation detecting means connected to said second control means, said brake operating signal being applied to said auxiliary brake simultaneously when a braking operation is detected.
Claim 9
Dependent Claim
16 words
An electric vehicle as claimed in claim 4, wherein said auxiliary brake is a negative brake.
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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) | 1995-11-10 | 1996-05-11 | 1996-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-11-10 | 2000-05-11 | 2000-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-11-10 | 2004-05-11 | 2004-11-10 | $7700.00 | Window Closed / Lapsed |