US5033565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor-driven power steering apparatus
Assignee: Hitachi Ltd
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Filing: 1989-10-18
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Granted: 1991-07-23
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Expires: 2009-10-18
Abstract
Abstract A generator generates two voltage outputs which have different voltage levels. One voltage output from the generator is used for operating a power steering apparatus. Another voltage output from the generator is used for charging a battery which supplies current to other loads.
Inventors
- 👤 Toshimi Abukawa
- 👤 Toshiaki Okuyama
- 👤 Kazuo Tahara
- 👤 Katsuji Marumoto
- 👤 Toshiyuki Koterazawa
- 👤 Mitsuyuki Hombu
- 👤 Tadashi Takahashi
- 👤 Hisatugu Ishikura
- 👤 Hiroshisa Yamamura
- 👤 Toru Tatsuzaki
- 👤 Tsutomu Omae
- 👤 Shuichi Takamatsu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:50
CPC Classifications
B; B62; B62D; B62D5/00; B62D5/04; B62D5/0457
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
174 words
A motor driven power steering apparatus for a vehicle which depends on a D.C. power source as an energy source for electrical devices mounted on the vehicle, and which produces an auxiliary steering force in response to the torque applied to the steering column of the vehicle, comprising: means for supplying a first D.C. voltage at a first voltage level; means for supplying a second D.C. voltage at a second voltage level which is lower than said first voltage level; and actuator means for generating an auxiliary steering force for the vehicle, including a motor for supplying the auxiliary steering force and current control means for controlling current supplied to said motor to control said auxiliary steering force; said current control means including a chopper device connected to said motor and said first D.C. voltage supplying means for controlling the current supplied to said motor and a chopper controller connected to said second D.C. voltage supplying means for controlling said chopper device in accordance with torque applied to the steering column of the vehicle.
Claim 2
Dependent Claim
174 words
A motor driven power steering apparatus for a vehicle which depends on a D.C. power source as an energy source for electrical devices mounted on the vehicle, and which produces an auxiliary steering force in response to the torque applied to the steering column of the vehicle, comprising: means for supplying a first D.C. voltage at a first voltage level; means for supplying a second D.C. voltage at a second voltage level which is lower than said first voltage level; and actuator means for generating an auxiliary steering force for the vehicle, including a motor for supplying the auxiliary steering force and current control means for controlling current supplied to said motor to control said auxiliary steering force; said current control means including a chopper device connected to said motor and said first D.C. voltage supplying means for controlling the current supplied to said motor and a chopper controller connected to said second D.C. voltage supplying means for controlling said chopper device in accordance with torque applied to the steering column of the vehicle.
Claim 3
Dependent Claim
25 words
An apparatus according to claim 1, wherein said second D.C. voltage supplying means includes a battery connected to supply energizing voltage to said chopper controller.
Claim 4
Dependent Claim
62 words
An apparatus according to claim 2, further including a diode connected between said battery and said first D.C. voltage supplying means and having a polarity so as to be biased to non-conduction by the higher voltage level of said first D.C. voltage, whereby, in the absence of said first D.C. voltage, said chopper device is powered from said battery via said diode.
Claim 5
Dependent Claim
33 words
An apparatus according to claim 1, wherein said first D.C. voltage supplying means and said second D.C. voltage supplying means are each powered from a generator driven by the engine of the vehicle.
Claim 6
Dependent Claim
34 words
An apparatus according to claim 1, wherein said first D.C. voltage supplying means and said second D.C. voltage supplying means are both powered from the same generator driven by the engine of the vehicle.
Claim 7
Dependent Claim
42 words
An apparatus according to claim 5, wherein said generator includes means for generating a second output having a predetermined voltage level for charging said battery and means for generating a first output having a voltage level higher than said predetermined voltage level.
Claim 8
Dependent Claim
135 words
A motor driven power steering apparatus for a vehicle which depends on a D.C. power source as an energy source for electrical devices mounted on the vehicle, comprising: a battery connected to supply a first voltage at a first level to said electrical devices of the vehicle; a power source supplying a second voltage at a second level which is substantially higher than said first level; and actuator means for generating an auxiliary steering force for the vehicle, including a brushless motor for supplying the auxiliary steering force and current control means connected to said brushless motor for controlling current supplied to said brushless motor to control said auxiliary steering force; said current control means including an inverter connected to said power source and to said brushless motor for supplying current to said brushless motor.
Claim 9
Dependent Claim
135 words
A motor driven power steering apparatus for a vehicle which depends on a D.C. power source as an energy source for electrical devices mounted on the vehicle, comprising: a battery connected to supply a first voltage at a first level to said electrical devices of the vehicle; a power source supplying a second voltage at a second level which is substantially higher than said first level; and actuator means for generating an auxiliary steering force for the vehicle, including a brushless motor for supplying the auxiliary steering force and current control means connected to said brushless motor for controlling current supplied to said brushless motor to control said auxiliary steering force; said current control means including an inverter connected to said power source and to said brushless motor for supplying current to said brushless motor.
Claim 10
Dependent Claim
51 words
An apparatus according to claim 7, further including a diode connected between said battery and said power source with a polarity so as to be biased to non-conduction by said second voltage level, whereby, when said power source is not supplying said second voltage, said inverter is powered from said battery.
References Cited (Backward Citations)
US1782940A
Cited
US2152405A
Cited
US4045718A
Cited
US4207511A
Cited
US4564799A
Cited
JPS59156863A
Cited
US4517507A
Cited
US4653601A
Cited
US4804057A
Cited
US4960178A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-07-22 | 1995-01-21 | 1995-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-22 | 1999-01-21 | 1999-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-22 | 2003-01-21 | 2003-07-23 | $7700.00 | Window Closed / Lapsed |