Method and apparatus for diagnosing electrically operated brake without manual operation of brake operating member
First Claim
1. A method of diagnosing an electrically operated brake for abnormality thereof in an automotive vehicle wherein the brake includes an electric motor as a drive source for generating a friction force upon an operation of a manually operated brake operating member, to brake a wheel of the vehicle, said method comprising the steps of:
- applying an abnormality checking drive signal to said electric motor to operate said electric motor while said manually operated brake operating member is placed in a non-operated position;
detecting a quantity relating to an output of said electric motor while said abnormality checking drive signal is applied to said electric motor; and
determining that said electrically operated brake is abnormal, if the detected quantity does not normally correspond to a magnitude of said abnormality checking drive signal.
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Accused Products
Abstract
A method of diagnosing an electrically operated brake for abnormality thereof in an automotive vehicle wherein a wheel is braked by a friction force generated by an electric motor of the brake upon an operation of a brake operating member, the method comprising the steps of: applying an abnormality checking drive signal to the electric motor to operate the electric motor while the brake operating member is placed in a non-operated position; detecting a quantity relating to an output of the electric motor while the drive signal is applied to the electric motor; and determining that the electrically operated brake is abnormal, if the detected quantity does not normally correspond to a magnitude of the abnormality checking drive signal.
115 Citations
19 Claims
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1. A method of diagnosing an electrically operated brake for abnormality thereof in an automotive vehicle wherein the brake includes an electric motor as a drive source for generating a friction force upon an operation of a manually operated brake operating member, to brake a wheel of the vehicle, said method comprising the steps of:
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applying an abnormality checking drive signal to said electric motor to operate said electric motor while said manually operated brake operating member is placed in a non-operated position; detecting a quantity relating to an output of said electric motor while said abnormality checking drive signal is applied to said electric motor; and determining that said electrically operated brake is abnormal, if the detected quantity does not normally correspond to a magnitude of said abnormality checking drive signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method of diagnosing an electrically operated brake for abnormality thereof in an automotive vehicle having a drive power source, a manually operated vehicle accelerating member for increasing an output of the drive power source for accelerating the automotive vehicle, a manually operated normal brake operating member for operating an electric motor of said electrically operated brake to generate a friction force for braking a wheel of the automotive vehicle, a parking brake, and a manually operated parking brake operating member for activating said parking brake to apply a parking brake to said wheel, and wherein a creep torque is applied from said drive power source to said wheel for slowly starting said automotive vehicle while said vehicle accelerating member is placed in a non-operated position, said method comprising the steps of:
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applying an abnormality checking drive signal to said electric motor of said electrically operated brake when the automotive vehicle is at a stop with said automotive vehicle being braked by said electrically operated brake and said parking brake while said creep torque is applied to said wheel, said driving signal having a magnitude which is determined regardless of an amount of operation of said normal brake operating member such that a braking force generated by said electrically operated brake is larger than said creep torque; and determining that said electrically operated brake is abnormal, if said automotive vehicle is started when said parking brake operating member has been operated to a non-operated position thereof while said normal brake operating member is held in an operated position thereof. - View Dependent Claims (10, 11, 12)
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13. A braking system for an automotive vehicle comprising an electrically operated braking device including (a) a manually operated brake operating member, (b) a braking member having a rotor rotating with a wheel of the vehicle and a friction member which is forced onto said rotor to brake said wheel, (c) an electric motor, (d) a drive force transmitting device for transmitting a drive force of said electric motor to said friction member, (e) an operation amount sensor for detecting an amount of operation of said brake operating member, and (f) a motor controller for controlling said electric motor on the basis of an output of said operation amount sensor, said braking system further comprising:
a diagnosing device for applying an abnormality checking drive signal to said electric motor to operate said electric motor while said manually operated brake operating member is placed in a non-operated position, detecting a quantity relating to an output of said electric motor while said abnormality checking drive signal is applied to said electric motor, and determining that said electrically operated braking device is abnormal, if the detected quantity does not normally correspond to a magnitude of said abnormality checking drive signal. - View Dependent Claims (14, 15, 16, 17, 18)
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19. A braking system for an automotive vehicle, comprising a drive power source, a manually operated vehicle accelerating member for increasing an output of the drive power source for accelerating the automotive vehicle, an electrically operated brake, a manually operated normal brake operating member for operating an electric motor of said electrically operated brake to generate a friction force for braking a wheel of the automotive vehicle, a parking brake, and a manually operated parking brake operating member for activating said parking brake to apply a parking brake to said wheel, said automotive vehicle being arranged such that a creep torque is applied from said drive power source to said wheel for slowly starting said automotive vehicle while said vehicle accelerating member is placed in a non-operated position thereof, said braking system further comprising:
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a diagnosing device for applying an abnormality checking drive signal to said electric motor of said electrically operated brake when the automotive vehicle is at a stop with said automotive vehicle being braked by said electrically operated brake and said parking brake while said creep torque is applied to said wheel, said driving signal having a magnitude which is determined regardless of an amount of operation of said normal brake operating member such that a braking force generated by said electrically operated brake is larger than said creep torque, said diagnosing device determining that said electrically operated brake is abnormal, if said automotive vehicle is started when said parking brake operating member has been operated to a non-operated position thereof while said normal brake operating member is held in an operated position thereof.
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Specification