Patent US224405A successfully refreshed from Google Patents.
Patent EP0141626B1 successfully refreshed from Google Patents.
EP0141626B1
Expired / Lapsed
EP
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Power steering control apparatus
Assignee: Mitsubishi Electric Corp
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Filing: 1984-10-25
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Granted: 1988-08-10
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Expires: 2004-10-25
Abstract
No abstract record available.
Inventors
- 👤 Mitsuharu Morishita
- 👤 Shinichi Kouge
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 21:21
CPC Classifications
B; B62; B62D; B62D5/00; B62D5/06; B62D6/00; B62D6/008; B62D6/02
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
237 words
A power steering control apparatus comprising a vehicle speed sensor (3), a power source (1), an electric control circuit (5) connected to said car speed sensor and said power source, and a proportional solenoid (4), responsive to the output of said electric control circuit, for providing a steering reaction oil pressure, the control circuit (5) being connected to the speed sensor (3) and to the proportional solenoid (4) for reducing the power applied for steering as speed increases and for cutting off the power applied for steering in the event of a circuit failure, characterised in that said electric control circuit (5) includes: first means (501) for producing a command signal in inverse proportion to the output of said car speed sensor; second means (507) for detecting a current signal flowing through said proportional solenoid; third means (502) for comparing said command signal with said current signal as a feedback signal to develop an error signal therebetween; fourth means (505) for developing from said error signal a driving signal for said proportional solenoid; fifth means (508), responsive to said error signal, for detecting a predetermined abnormal condition and holding said abnormal condition; and, sixth means (509), responsive to the output of said fifth means, for passing the electrical energy from said power source (1) to said fourth means (505) in the normal condition while interrupting said electrical energy to said fourth means in said predetermined abnormal condition.
Claim 2
Dependent Claim
237 words
A power steering control apparatus comprising a vehicle speed sensor (3), a power source (1), an electric control circuit (5) connected to said car speed sensor and said power source, and a proportional solenoid (4), responsive to the output of said electric control circuit, for providing a steering reaction oil pressure, the control circuit (5) being connected to the speed sensor (3) and to the proportional solenoid (4) for reducing the power applied for steering as speed increases and for cutting off the power applied for steering in the event of a circuit failure, characterised in that said electric control circuit (5) includes: first means (501) for producing a command signal in inverse proportion to the output of said car speed sensor; second means (507) for detecting a current signal flowing through said proportional solenoid; third means (502) for comparing said command signal with said current signal as a feedback signal to develop an error signal therebetween; fourth means (505) for developing from said error signal a driving signal for said proportional solenoid; fifth means (508), responsive to said error signal, for detecting a predetermined abnormal condition and holding said abnormal condition; and, sixth means (509), responsive to the output of said fifth means, for passing the electrical energy from said power source (1) to said fourth means (505) in the normal condition while interrupting said electrical energy to said fourth means in said predetermined abnormal condition.
Claim 3
Dependent Claim
41 words
A power steering control apparatus as claimed in claim 1 wherein said first means (501) comprises a frequency-voltage converter which converts the speed signal from said car speed sensor (3) into a corresponding voltage in inverse proportion to said speed signals.
Claim 4
Dependent Claim
50 words
A power steering control apparatus as claimed in claim 2 wherein said second means (507) comprises a shunt resistor (506) connected to the output of said solenoid (4) and ground, and a solenoid current detection circuit (507) for detecting the voltage across said shunt resistor corresponding to the solenoid current.
Claim 5
Dependent Claim
53 words
A power steering control apparatus as claimed in claim 3 wherein said third means (502) comprises an error amplifying circuit (502) for comparing said command signal from said frequency-voltage converter (501) with the output voltage of said solenoid current detection circuit (507) as a feedback signal and for developing an error signal therebetween.
Claim 6
Dependent Claim
88 words
A power steering control apparatus as claimed in claim 4 wherein said fourth means (505) comprises a reference wave generator (503), a pulse width modulation circuit (504) for modulating the reference wave from said generator with said error signal from said error amplifying circuit (502) to develop a PWM wave voltage, and a proportional solenoid driving circuit (505) for receiving the electrical energy from said power source (1) through said fifth means (508) to develop a driving current for said solenoid through an electrical wiring in the car.
Claim 7
Dependent Claim
87 words
A power steering control appparatus as claimed in any preceding claim wherein said fifth means (508) comprises an integration portion (508b, c) for integrating said error signal from said error amplification circuit, a comparing portion (508f) for comparing the integrated voltage of said integration portion with a reference voltage corresponding to said predetermined abnormal detective signal and for providing as an output therefrom a signal indicating the abnormal condition, and a holding portion (508h) for holding the integrated voltage of said integration portion in said abnormal condition.
Claim 8
Dependent Claim
121 words
A power steering control apparatus as claimed in claim 6 wherein said integration portion (508b) includes a first resistor (508c) and a capacitor (508b), said comparing portion includes second and third voltage dividing resistors (508d, e) and a comparator (508f) for comparing the integrated voltage with the divided reference voltage and providing as an output therefrom a logic signal (ABN) in the abnormal condition, and said holding portion includes a transistor (Tr) the base of which is connected to the output of said comparator (508f), the collector of which is connected through said sixth means (509) to ground and connected to the output of said integration portion (108b, c), and the emitter of which is connected to said power source (1).
Claim 9
Dependent Claim
24 words
A power steering control apparatus as claimed in claim 7, further including a fourth resistor for discharging the integrated voltage of said integration portion.
Claim 10
Dependent Claim
53 words
A power steering control apparatus as claimed in claim 8 wherein said sixth means (509) comprises a protection relay having a relay coil (509a) connected between the collector of said transistor (Tr) and ground and having a normally closed contact (509b) connected between said power source (1) and said solenoid driving circuit (505).
Claim 11
Dependent Claim
26 words
A power steering control apparatus as claimed in claim 9, further comprising a key switch (2) connected between said normally closed contact and said power source.
References Cited (Backward Citations)
No citation records indexed.
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