Controller for motor-driven power steering mechanism
AssigneeToyoda Koki Kabushiki Kaisha
InventorsJiro Nakano, Ichiro Nagashima
Life of this patent
Estimating the term…
Abstract
In a controller for a motor-driven power steering mechanism, a motor control section outputs to a drive circuit a control signal corresponding to a torque command output from a torque calculation section. A digital signal processor receives the control signal, calculates an average of values of the control signal during a predetermined period of time, and outputs the average to an anomalous-state monitor section. The anomalous-state monitor section counts the number of times the average deviates from an allowable range. When the number of times has reached a predetermined number, the anomalous-state monitor section judges that the controller has come into an anomalous-state, and outputs a control prohibition signal to the motor control section.
Claims13
A controller for a motor-driven power steering mechanism including a steering mechanism, a steering wheel connected to the steering mechanism, a torque-sensing mechanism for sensing steering torque applied to the steering wheel, and an electric motor for producing an assisting steering torque, the controller comprising:
- a control section for controlling the electric motor on the basis of a control signal corresponding to the steering torque sensed by the torque-sensing mechanism;
- an anomalous-state judgment section which receives the control signal output from the control section, determines a degree of continuity of a state in which the control signal assumes an anomalous level, and judges that the control section is anomalous when the determined degree of continuity reaches a predetermined level;
- and
- wherein the anomalous-state judgment section comprises a control prohibition section for stopping control of the electric motor when the anomalous-state judgment section detects an anomalous-state of the control section.
A controller for a motor-driven power steering mechanism including a steering mechanism, a steering wheel connected to the steering mechanism, a torque-sensing mechanism for sensing steering torque applied to the steering wheel, and an electric motor for producing an assisting steering torque, the controller comprising:
- a control section for controlling the electric motor on the basis of a control signal corresponding to the steering torque sensed by the torque-sensing mechanism;
- an anomalous-state judgment section which receives the control signal output from the control section, determines a degree of continuity of a state in which the control signal assumes an anomalous level, and judges that the control section is anomalous when the determined degree of continuity reaches a predetermined level;
- and
- wherein the anomalous-state judgment section judges that the control section is anomalous when the number of times the received control signal deviates from an allowable range has reached a predetermined number.
A controller for a motor-driven power steering mechanism including a steering mechanism, a steering wheel connected to the steering mechanism, a torque-sensing mechanism for sensing steering torque applied to the steering wheel, and an electric motor for producing an assisting steering torque, the controller comprising:
- a control section for controlling the electric motor on the basis of a control signal corresponding to the steering torque sensed by the torque-sensing mechanism, an anomalous-state judgment section which receives the control signal output from the control section, determines a degree of continuity of a state in which the control signal assumes an anomalous level, and judges that the control section is anomalous when the determined degree of continuity reaches a predetermined level, and wherein the anomalous-state judgment section judges that the control section is anomalous when the number of times the received control signal deviates from an allowable range has reached a predetermined number within a predetermined time period.
Dependencies are inferred from the claim text.