Patent ID: 11945477
Assignee: KOREA RAILROAD RESEARCH INSTITUTE
Field: Transport (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. An electric dual-mode wiper system for a railway vehicle, comprising:
a first wiper drive unit that includes a first wiper, a first main motor and a first auxiliary motor for driving the first wiper, a first linkage structure for connecting the first main motor and the first auxiliary motor to the first wiper, a first proximity sensor for sensing a position of the first wiper, and a first encoder for sensing an operation state of the first linkage structure;
a second wiper drive unit that includes a second wiper arranged to be spaced apart from the first wiper, a second main motor and a second auxiliary motor for driving the second wiper, a second linkage structure for connecting the second main motor and the second auxiliary motor to the second wiper, a second proximity sensor for sensing a position of the second wiper, and a second encoder for sensing an operation state of the second linkage structure;
a first current measurement unit that measures a current of the first main motor or the first auxiliary motor in real time;
a second current measurement unit that measures a current of the second main motor or the second auxiliary motor in real time; and
a wiper control device that controls a synchronization operation of the first main motor, the first auxiliary motor, the second main motor and the second auxiliary motor based on information on the operation states of the first linkage structure and the second linkage structure transmitted from the first encoder and the second encoder,
wherein the wiper control device switches a rotation direction of the first main motor or the first auxiliary motor to an opposite direction and moves the first wiper to an initial position thereof when a current value of the first main motor or the first auxiliary motor measured by the first current measurement unit is greater than or equal to a threshold value, and switches a rotation direction of the second main motor or the second auxiliary motor to an opposite direction and moves the second wiper to an initial position thereof when a current value of the second main motor or the second auxiliary motor measured by the second current measurement unit is greater than or equal to a threshold value,
wherein the control unit synchronously control the first main motor, the first auxiliary motor, the second main motor and the second auxiliary motor in order for the first wiper and the second wiper to have the same rotation speed or the same rotation angle based on information transmitted from the first encoder and the second encoder when the first encoder and the second encoder are in a normal operation, and synchronously control the first main motor, the first auxiliary motor, the second main motor and the second auxiliary motor in order for the first wiper and the second wiper to have the same rotation speed or the same rotation angle based on information transmitted from the first proximity sensor and the second proximity sensor when the first encoder and the second encoder are in an abnormal operation state, and
wherein the first auxiliary motor drives the first wiper when the first main motor is in an abnormal state and the second auxiliary motor drives the second wiper when the second main motor is in an abnormal state.