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EP0274541A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Motor driven power steering controller

Assignee: Mitsubishi Electric Corp
•
Filing: 1987-07-11
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Granted: —
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Expires: 2007-07-11
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Abstract

Abstract A motor driven power steering controller which auxiliary actuates a steering gear of an automobile with motor rotational force in accordance with a transmission position. This controller consists of a transmission position sensor (10) for sensing the transmission position, a torque sensor (3) for sensing the rotational force of a steering wheel (1), a control unit (3) for receiving the signal of each sensor, a D.C. motor (13) for providing auxiliary actuation force and an electromagnetic clutch (16) disposed at a mechanical connection portion between the output of the motor (13) and a rack shaft (6). The control unit (9) controls the rotation of the motor (3) and the engagement and disengagement of the electromagnetic clutch (16) in order to assist or cut off the steering gear. The controller of this invention needs neither complicated input circuit portion nor control program.

Inventors

  • 👤 Mitsuharu; Morishita
  • 👤 Shinichi; Kouge

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-05 14:52
CPC Classifications
B; B62; B62D; B62D5/00; B62D5/04; B62D5/0457; B62D5/046; B62D5/0463; B62D5/0475; B62D5/0478

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 93 words
A motor driven type power steering control device comprising a speed change point sensor for sensing a speed change point, a torque sensor provided on an intermedial portion of a steering shaft for sensing a rotational force applied to a steering wheel, a control unit responsive to output signals of said speed change point sensor and said torque sensor, a d.c. motor driven by a vehicle mounted battery through said control unit and an electromagnetic clutch connected directly to an output shaft of said d.c. motor and on-off controlled by said control unit.
Claim 2
Dependent Claim 93 words
A motor driven type power steering control device comprising a speed change point sensor for sensing a speed change point, a torque sensor provided on an intermedial portion of a steering shaft for sensing a rotational force applied to a steering wheel, a control unit responsive to output signals of said speed change point sensor and said torque sensor, a d.c. motor driven by a vehicle mounted battery through said control unit and an electromagnetic clutch connected directly to an output shaft of said d.c. motor and on-off controlled by said control unit.
Claim 3
Dependent Claim 221 words
The motor driven type power steering control device as claimed in claim 1, wherein said control unit comprises a steering torque measuring means responsive to said output signal of said torque sensor for measuring a steering torque, a speed change point detection means responsive to said output signal of said speed change point sensorfor detecting a speed change point, an assist judge means responsive to an output of said speed change point detector for judging whether or not an assist is possible, a motor current setting means for normally setting a current to a value corresponding to a steering torque, setting the current to zero when an output of said assist judge means indicates a negative decision, setting predetermined delay times for shifts from an assist to an assist cut off and from an assist cut off to an assist, respectively, to increase the motor current to a value corresponding to a steering torque during the assist mode and to decrease the motor current to zero during the assist cut off mode, a motor current control means responsive to an output of said motor current setting means to control the motor current accordingly and an electromagnetic clutch control means responsive to the outputs of said assist judge means and said motor current setting means to engage or disengage said electromagnetic clutch.

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