Rain sensor capable of compensating for a change of infrared ray transmissivity of a windshield
First Claim
1. A rain sensor for a vehicle including a light emitting device and a light receiving device that receives a portion of light reflected by a windshield, comprising:
- a variable resistor device for realizing a specific resistance that relates to an output value of the rain sensor; and
a control unit configured to calculate infrared ray transmissivity of the windshield based on one or more parameters of the rain sensor, and to control the variable resistor device such that the resistance of the variable resistor device is determined according to the calculated transmissivity.
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Accused Products
Abstract
A rain sensor for a vehicle including a light emitting device and a light receiving device that receives a portion of light reflected by a windshield is provided. The rain sensor comprises a variable resistor device and a control unit. The variable resistor device realizes a specific resistance that relates to an output value of the rain sensor. The control unit is configured to calculate infrared ray transmissivity of the windshield based on one or more parameters of the rain sensor, and to control the variable resistor device such that the resistance of the variable resistor device is determined according to the calculated transmissivity.
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Citations
4 Claims
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1. A rain sensor for a vehicle including a light emitting device and a light receiving device that receives a portion of light reflected by a windshield, comprising:
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a variable resistor device for realizing a specific resistance that relates to an output value of the rain sensor; and
a control unit configured to calculate infrared ray transmissivity of the windshield based on one or more parameters of the rain sensor, and to control the variable resistor device such that the resistance of the variable resistor device is determined according to the calculated transmissivity. - View Dependent Claims (2, 3)
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4. A method for compensating a change of infrared ray transmissivity of a windshield for a rain sensor including a light emitting device, a light receiving device that receives a portion of emitted light reflected by the windshield, and a variable resistor device, the method comprising:
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calculating infrared ray transmissivity of the windshield based on at least one parameter of the rain sensor;
calculating a target resistance of the variable resistor device based on the calculated transmissivity; and
controlling the variable resistor device such that a resistance of the variable resistor device becomes the calculated target resistance.
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Specification