US5355749A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control apparatus and control method for motor drive vehicle
Assignee: Hitachi Ltd
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Filing: 1992-12-17
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Granted: 1994-10-18
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Expires: 2012-12-17
Abstract
Abstract A control apparatus of a motor drive vehicle includes a unit for generating a target vehicle speed; a speed instruction unit for generating a target motor rotational speed of the motor based upon a preset motor control pattern in response to the target vehicle speed; a power circuit for operating the motor at the target motor rotational speed upon receipt of the target motor rotational speed; a variable transmission unit for converting a drive output from the motor into a transmission ratio for instructing a rotational speed of the drive output, and transferring the converted transmission ratio to a drive shaft of the motor drive vehicle; and a transmission ratio calculating unit for determining the transmission gear ratio based on the target vehicle speed and the target motor rotational speed thereby to instruct the determined transmission gear ratio to the variable transmission unit. A control method sets a target vehicle speed value; produces a target motor rotational speed based upon the target vehicle speed value and a preset motor control pattern; operates the motor at the target motor rotational speed; determines a transmission gear ratio based upon both of the target vehicle speed and the target motor rotational speed; and converts a rotational speed of a drive output into the transmission ratio and transfers the converted transmission ratio to a drive shaft.
Inventors
- 👤 Sanshiro Obara
- 👤 Ryoso Masaki
- 👤 Toshiaki Okuyama
- 👤 Tsutomu Ohmae
- 👤 Keigo Naoi
- 👤 Makoto Shioya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:38
CPC Classifications
B; B60; B60K; B60K6/00; B60K6/20; B60K6/50; B60K6/54; B60K6/543; B60K31/00; B60K31/02; B60K31/04; B60L; B60L15/00; B60L15/02; B60L15/025; B60L15/20; B60L15/2045; B60L15/2054; B60L50/00; B60L50/50; B60L50/51; B60L8/00; B60L8/003; B60W; B60W10/00; B60W10/04; B60W10/08; B60W10/10; B60W10/101; B60W10/107; B60W30/00; B60W30/18; B60W30/188; B60W30/1882; F; F16; F16H; F16H61/00; F16H61/66; B60W50/00; B60W2050/0001; B60W2050/0002; B60W2050/0008; B60W2050/001; B60W2050/0019; B60W2540/00; B60W2540/10; B60W2710/00; B60W2710/10; B60W2710/1005; B60W2720/00; B60W2720/10; Y; Y02; Y02T; Y02T10/00; Y02T10/60; Y02T10/64; Y02T10/70; Y02T10/7072; Y02T10/72; Y10; Y10S; Y10S903/00; Y10S903/902; Y10S903/903; Y10S903/904; Y10S903/915; Y10S903/917; Y10S903/918
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
217 words
A control apparatus of a vehicle driven by an electric motor, comprising: means for generating a target vehicle speed according to an operator input of an accelerator device; vehicle speed control means, having means for detecting actual speed of said vehicle and means for calculating difference between said target vehicle speed and the actual vehicle speed, for controlling a vehicle speed so as to make the difference zero; motor speed instruction means for receiving an instruction value corresponding to a value of said different and for generating a target motor speed according to a predetermined high efficiency pattern whereon maximum efficiency points are plotted in relation to the motor speed values and motor power values obtained from values of said difference; motor control means for receiving said target motor speed from said motor speed instruction means and driving said electric motor in said target motor speed; variable transmission means for receiving output of said electric motor and varying rotation speed of said output of the motor in a transmission ratio instructed so as to transfer the rotation to a drive shaft of said vehicle; and transmission ratio calculating means for determining said transmission ratio on the basis of said target vehicle speed and said target motor speed and instructing said transmission ratio to said variable transmission means.
Claim 2
Dependent Claim
217 words
A control apparatus of a vehicle driven by an electric motor, comprising: means for generating a target vehicle speed according to an operator input of an accelerator device; vehicle speed control means, having means for detecting actual speed of said vehicle and means for calculating difference between said target vehicle speed and the actual vehicle speed, for controlling a vehicle speed so as to make the difference zero; motor speed instruction means for receiving an instruction value corresponding to a value of said different and for generating a target motor speed according to a predetermined high efficiency pattern whereon maximum efficiency points are plotted in relation to the motor speed values and motor power values obtained from values of said difference; motor control means for receiving said target motor speed from said motor speed instruction means and driving said electric motor in said target motor speed; variable transmission means for receiving output of said electric motor and varying rotation speed of said output of the motor in a transmission ratio instructed so as to transfer the rotation to a drive shaft of said vehicle; and transmission ratio calculating means for determining said transmission ratio on the basis of said target vehicle speed and said target motor speed and instructing said transmission ratio to said variable transmission means.
Claim 3
Dependent Claim
18 words
A control apparatus as claimed in claim 1, wherein said variable transmission means includes a continuously variable transmission.
Claim 4
Dependent Claim
55 words
A control apparatus as claimed in claim 1, wherein said power circuit includes: means for detecting an actual motor output rotational speed; means for obtaining deviation between said target motor rotational speed and said motor output rotational speed; and a feedback loop for controlling said motor along such a direction that said deviation becomes zero.
Claim 5
Dependent Claim
31 words
A control apparatus as claimed in claim 1, wherein said power circuit includes an inverter in which a battery mounted on said motor drive vehicle is used as a power source.
Claim 6
Dependent Claim
32 words
A control apparatus as claimed in claim 1, wherein said transmission gear ratio calculating means includes: means for calculating a ratio of said target vehicle speed to said target motor rotation speed.
Claim 7
Dependent Claim
24 words
A control apparatus as claimed in claim 1, wherein said vehicle speed control means has a variable control constant of a transfer function thereof.
Claim 8
Dependent Claim
45 words
A control apparatus as claimed in claim 6, wherein said vehicle speed control means contains a proportional integral compensating control system, and both of a proportional compensating constant and an integral constant of a transfer function of said proportional integral compensating control system are variable.
Claim 9
Dependent Claim
23 words
A control apparatus as claimed in claim 1, wherein said variable transmission means is constructed by combining a plurality of continuously variable transmissions.
Claim 10
Dependent Claim
29 words
A control apparatus as claimed in claim 1, wherein said vehicle transmission means is constructed by combining a continuously variable transmission with a transmission having a fixed transmission ratio.
Claim 11
Dependent Claim
42 words
A control apparatus as claimed in claim 1, wherein said motor is juxtaposed with said transmission means, said motor drive vehicle further includes a cooling system, and both of said motor and said transmission means are commonly cooled by said cooling system.
Claim 12
Dependent Claim
19 words
A control apparatus as claimed in claim 4, wherein said motor is an induction motor driven by said inverter.
Claim 13
Independent Claim
155 words
A method for controlling a vehicle driven by an electric motor, comprising the steps of: setting a target vehicle speed according to operation amount of an accelerator device; detecting actual speed of said vehicle; calculating difference between said target vehicle speed and the actual vehicle speed; and controlling a vehicle speed to make the difference zero, said vehicle speed controlling step further including the steps of: generating a target motor speed according to a predetermined high efficiency pattern whereon maximum efficiency points are plotted in relation to the motor speed values and motor power values obtained from values of said the difference; driving said electric motor in said target motor speed; determining a translation ratio on the basis of said target vehicle speed and said target motor speed; and varying rotation speed of said output of the motor in said transmission ratio so as to transfer the rotation to a drive shaft of said vehicle.
Claim 14
Independent Claim
155 words
A method for controlling a vehicle driven by an electric motor, comprising the steps of: setting a target vehicle speed according to operation amount of an accelerator device; detecting actual speed of said vehicle; calculating difference between said target vehicle speed and the actual vehicle speed; and controlling a vehicle speed to make the difference zero, said vehicle speed controlling step further including the steps of: generating a target motor speed according to a predetermined high efficiency pattern whereon maximum efficiency points are plotted in relation to the motor speed values and motor power values obtained from values of said the difference; driving said electric motor in said target motor speed; determining a translation ratio on the basis of said target vehicle speed and said target motor speed; and varying rotation speed of said output of the motor in said transmission ratio so as to transfer the rotation to a drive shaft of said vehicle.
Claim 15
Dependent Claim
221 words
A control apparatus of a vehicle driven by an electric motor, comprising: a target vehicle speed generating unit providing a target vehicle speed according to an operator input of an accelerator device; vehicle speed control unit, having an actual speed detection unit and a difference calculating unit for calculating a difference between said target vehicle speed and the actual vehicle speed, for controlling a vehicle speed so as to make the difference zero; motor speed instruction device for receiving an instruction value corresponding to a value of said different and for generating a target motor speed according to a predetermined high efficiency pattern whereon maximum efficiency points are plotted in relation to the motor speed values and motor power values obtained from values of said difference; motor control unit for receiving said target motor speed from said motor speed instruction device and driving said electric motor in said target motor speed; a variable transmission for receiving output of said electric motor and varying rotation speed of said output of the motor in a transmission ratio instructed so as to transfer the rotation to a drive shaft of said vehicle; and transmission ratio calculating unit for determining said transmission ratio on the basis of said target vehicle speed and said target motor speed and instructing said transmission ratio to said variable transmission.
Claim 16
Dependent Claim
221 words
A control apparatus of a vehicle driven by an electric motor, comprising: a target vehicle speed generating unit providing a target vehicle speed according to an operator input of an accelerator device; vehicle speed control unit, having an actual speed detection unit and a difference calculating unit for calculating a difference between said target vehicle speed and the actual vehicle speed, for controlling a vehicle speed so as to make the difference zero; motor speed instruction device for receiving an instruction value corresponding to a value of said different and for generating a target motor speed according to a predetermined high efficiency pattern whereon maximum efficiency points are plotted in relation to the motor speed values and motor power values obtained from values of said difference; motor control unit for receiving said target motor speed from said motor speed instruction device and driving said electric motor in said target motor speed; a variable transmission for receiving output of said electric motor and varying rotation speed of said output of the motor in a transmission ratio instructed so as to transfer the rotation to a drive shaft of said vehicle; and transmission ratio calculating unit for determining said transmission ratio on the basis of said target vehicle speed and said target motor speed and instructing said transmission ratio to said variable transmission.
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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) | 1997-10-17 | 1998-04-18 | 1998-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-17 | 2002-04-18 | 2002-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-17 | 2006-04-18 | 2006-10-18 | $7700.00 | Window Closed / Lapsed |