Method for controlling a wiper motor
First Claim
1. A method for controlling a wiper motor equipping a wiper device in order to drive at least one wiper blade moving across a windshield according to an alternating path between a first and second end-of-travel positions, comprising the steps of:
- during a first initialization step,detecting first and second end-of-travel stops such as determined by the construction of the associated wiper device;
thendetermining from the first and second end-of-travel stops first and second end-of-travel test zones, the first end-of-travel test zone located between the first end-of-travel stop and a distance from the first end-of-travel stop toward the opposing second end-of-travel stop, and the second end-of-travel test zone located between the second end-of-travel stop and a distance from the second end-of-travel stop toward the opposing first end-of-travel stop, and in each of the first and second test zones the position of a software stop on which the blade changes wiping direction in normal operation;
during a normal operation step,detecting the position of the wiper blade relative to the first and second end-of-travel test zones, in order to determine the change of wiping direction;
realizing during at least one passage of the wiper blade in a test zone, a variation of the position of one end-of-travel software stop of the wiper blade; and
self-adapting of the end-of-travel software stop in relation to path of the wiper blade.
1 Assignment
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Accused Products
Abstract
A method for controlling a wiper motor of a wiper device for a motor vehicle windshield. A control unit implements the inventive method and a wiper device for a motor vehicle windshield. The control unit controls an electric motor which powers a wiper blade on a windshield sweeping between two end-of-travel zones. In each end-of-travel zone, there is a software end-of-travel stop which is moved by a predetermined value after each passage on the software stop, the latter always remaining in its test zone, thereby providing self-adaptation of the sweeping limits in time. The invention also enables the detection of the presence of obstacles on the wiper blade path.
12 Citations
15 Claims
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1. A method for controlling a wiper motor equipping a wiper device in order to drive at least one wiper blade moving across a windshield according to an alternating path between a first and second end-of-travel positions, comprising the steps of:
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during a first initialization step, detecting first and second end-of-travel stops such as determined by the construction of the associated wiper device;
thendetermining from the first and second end-of-travel stops first and second end-of-travel test zones, the first end-of-travel test zone located between the first end-of-travel stop and a distance from the first end-of-travel stop toward the opposing second end-of-travel stop, and the second end-of-travel test zone located between the second end-of-travel stop and a distance from the second end-of-travel stop toward the opposing first end-of-travel stop, and in each of the first and second test zones the position of a software stop on which the blade changes wiping direction in normal operation; during a normal operation step, detecting the position of the wiper blade relative to the first and second end-of-travel test zones, in order to determine the change of wiping direction; realizing during at least one passage of the wiper blade in a test zone, a variation of the position of one end-of-travel software stop of the wiper blade; and self-adapting of the end-of-travel software stop in relation to path of the wiper blade. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for controlling a wiper motor equipping a wiper device in order to drive at least one wiper blade moving across a windshield according to an alternating path between a first and second end-of-travel positions, comprising the steps of:
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during a first initialization step, detecting first and second end-of-travel stops such as determined by the construction of the associated wiper device;
thendetermining from the first and second end-of-travel stops first and second end-of-travel test zones and in each of the first and second test zones the position of a software stop on which the blade changes wiping direction in normal operation; during a normal operation step, detecting the position of the wiper blade relative to the first and second end-of-travel test zones, in order to determine the change of wiping direction; realization during at least one passage of the wiper blade in a test zone a variation of the position of its end-of-travel software stop such that self-adaptation of the wiping limits is produced in time as a function of forces; detecting the presence of an obstacle on an alternating path of the wiper blade outside of a test zone, while the wiper blade comes from one end-of-travel test zone, then determining a sweeping stop; controlling a reverse return of the wiper blade from a predetermined distance, then performing a stop of a predetermined duration and returning to the position of the obstacle, at least a predetermined number of times; and controlling an initialization step, such that the obstacle placed in the path of the wiper blade is considered as a physical end-of-travel stop and permitting sweeping during the normal operation step according to degraded amplitude.
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11. A control unit for controlling a wiper motor carrying a wiper device to drive at least one wiper blade across a surface in an alternating path between first and second end-of-travel positions comprising:
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means for determining an end-of-travel test zone at a first sweeping end, located between a physical end-of-travel and a distance from the physical end-of-travel toward an opposing physical end-of-travel, the input of the determining means connected to means for detecting the docking of the wiper blade on the physical end-of-travel stop; means for determining an end-of-travel test zone at a second sweeping end, located between a physical end-of-travel stop and a distance from the physical end-of-travel toward an opposing physical end-of-travel, the input of which is connected to means for detecting the docking of the wiper blade on the physical end-of-travel stop; means for determining the position of the end-of-travel stop in each end test zone; and means for controlling the movement of a wiper motor, such that the sweeping direction is reversed during each docking of a software end-of-travel stop and such that the position of each software end-of-travel stop is varied at the end of a determined sweeping, in order for the software end-of-travel stop to stay inside the test zone relative to the associated physical end-of-travel stop. - View Dependent Claims (12, 13, 14)
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15. A control unit for controlling a wiper motor carrying a wiper device to drive at least one wiper blade across a surface in an alternating path between first and second end-of-travel positions comprising:
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means for determining an end-of-travel test zone at a first sweeping end, the input of which is connected to means for detecting the docking of the wiper blade on a physical end-of-travel stop; means for determining an end-of-travel test zone at a second sweeping end, the input of which is connected to means for detecting the docking of the wiper blade on a physical end-of-travel stop; means for determining the position of the end-of-travel stop in each end test zone; means for controlling the movement of a wiper motor, such that the sweeping direction is reversed during each docking of a software end-of-travel stop and such that the position of each software end-of-travel stop is varied at the end of a determined sweeping, in order for the software end-of-travel stop to stay inside the test zone relative to the associated physical end-of-travel stop; and means for detecting the presence of an obstacle outside of an end-of-travel test zone, the output signal of which is transmitted to the activation input of a generator that includes; means for controlling a reverse return of the wiper blade from a predetermined distance; means for controlling a reverse return of the wiper blade until the preceding software end-of-travel stop; means for producing a stop time of a predetermined duration, then a return towards the detected position of the obstacle; first counter means for counting the number of detection of an obstacle from an intermediate stop position producing an active output signal when the number of detections surpasses a predetermined value, such that the means for controlling a reverse return of the wiper blade until the preceding software end-of-travel stop is activated; the counter means being reinitialized for counting the number of detections of an obstacle from an end-of-travel test zone; and producing means for counting an active output signal when the number of detections surpasses a predetermined value, such that at least one of the means of determining an end-of-travel test zone and a software end-of-travel stop are activated by taking the position of the obstacle as end-of-travel stop.
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Specification