Control method for wiper apparatus
AssigneeJidosha Denki Kogyo Kabushiki Kaisha
InventorsNoboru Kaneko, Koji Aoki
Life of this patent
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Abstract
The duty ratio of driving voltage-output to each wiper motor is required to be set according to the following conditions; (a) while each wiper blade is moved in an interval from a starting position to a predetermined first wiping position in upward operation, the duty ratio of a wiper motor on the side of a driver's seat is set so that the duty ratio is larger than the duty ratio of a wiper motor on the side of a passenger seat; and (b) while each wiper blade is moved in another interval from each upper return position to a predetermined second wiping position in return operation, the duty ratio of the wiper motor on the passenger seat side is set so that the duty ratio is larger than the duty ratio of the wiper motor on the driver's seat side.
Claims10
A method of controlling a wiper apparatus adapted for a vehicle, the wiper apparatus including:
- a first wiper blade for wiping a first wiped area of a windshield, the first wiper blade being reciprocated between a first starting position set on a side of a lower edge of the windshield and a first upper return position set on a side of a first side edge of the windshield,
- a first wiper motor for driving the first wiper blade,
- a second wiper blade for wiping a second wiped area of the windshield, the second wiper blade being reciprocated between a second starting position set on the lower edge of the windshield and a second upper return position set to a side of a second side edge of the windshield,
- a second wiper motor for driving the second wiper blade, and
- wherein the first and second wiper blades wipe an overlap area defined by an area on which the first wiped area and the second wiped area are overlapped such that the first wiper blade is moved in the overlap area prior to the second wiper blade in an overlapping manner in an upward operation from the starting positions to the upper return positions respectively, and such that the second wiper blade is moved in the overlap area prior to the first wiper blade in a return operation from the upper return positions to the starting positions,
- wherein the wiper apparatus is controlled by changing a mean output level of current to each wiper motor, comprising the steps of:
- (a) setting an output level of current to the first wiper motor so as to be higher than an output level of current to the second wiper motor, when the first wiper blade is moved from the starting position to a predetermined first wiping position in the upward operation;
- and
- (b) setting the output level of current to the second wiper motor so as to be higher than the output level of current to the first wiper motor, when the second wiper blade is moved from the second upper return position to a predetermined second wiping position in the return operation.
A wiper apparatus adapted for a vehicle, comprising:
- a first wiper blade for wiping a first wiped area of a windshield, the first wiper blade being reciprocated between a first starting position set on a side of a lower edge of the windshield and a first upper return position set on a side of a first side edge of the windshield;
- a first wiper motor for driving the first wiper blade;
- a first motor driving circuit for outputting driving voltage input to the first wiper motor so as to rotate the first wiper motor;
- a second wiper blade for wiping a second wiped area of the windshield, the second wiper blade being reciprocated between a second starting position set on the lower edge of the windshield and a second upper return position set to a side of a second side edge of the windshield;
- a second wiper motor for driving the second wiper blade;
- and
- a second motor driving circuit for outputting driving voltage input to the first wiper motor so as to rotate the first wiper motor;
- wherein the first and second wiper blades wipe an overlap area defined by an area on which the first wiped area and the second wiped area are overlapped such that the first wiper blade is moved in the overlap area prior to the second wiper blade in an overlapping manner in an upward operation from the starting positions to the upper return positions respectively, and such that the second wiper blade is moved in the overlap area prior to the first wiper blade in a return operation from the upper return positions to the starting positions,
- wherein each motor driving circuits changes a mean output level of current to each wiper motor so that:
- (a) an output level of current to the first wiper motor is set to be higher than an output level of current to the second wiper motor, when the first wiper blade is moved from the starting position to a predetermined first wiping position in the upward operation;
- and
- (b) the output level of current to the second wiper motor is set to be higher than the output level of current to the first wiper motor, when the second wiper blade is moved from the second upper return position to a predetermined second wiping position in the return operation
Dependencies are inferred from the claim text.