Wiper park switch input signal noise rejection circuit
A wiper system is provided and may include a wiper that operates between a parked state and a use state, a motor associated with the wiper that selectively moves the wiper between the parked state and the use state, and a switch that generates a signal identifying whether the wiper is in the parked state or the use state. The wiper system may also include a controller in communication with the switch. The controller may include a second-order filter and a comparator, whereby the controller passes the signal through the second-order filter and the comparator to differentiate between the parked state and the use state.
1. A wiper system comprising:
a wiper operable between a parked state and a use state;
a motor associated with said wiper and operable to selectively move said wiper between said parked state and said use state;
a switch operable to generate a signal that identifies whether said wiper is in said parked state or said use state; and
a controller in communication with said switch and including a second-order filter and a comparator, said controller passing said signal through said second-order filter and said comparator to differentiate between said parked state and said use state.
2. The wiper system of claim 1 , wherein said switch includes a first plate, a second plate, and a conductive grease disposed between said first plate and said second plate.
3. The wiper system of claim 1 , wherein said controller passes said signal through said second-order filter and subsequently passes an output of said second-order filter through said comparator.
4. The wiper system of claim 1 , wherein said controller is a body controller of a vehicle.
5. The wiper system of claim 1 , further comprising a user-input switch selectively supplying said controller with a control signal to direct said wiper between said parked state and said use state.
6. The wiper system of claim 5 , wherein said controller identifies a state of said wiper based on an output of said comparator and controls said wiper based on said control signal.
7. The wiper system of claim 5 , wherein said control signal is one of an ON signal requesting movement of said wiper between said parked state and said use state and an OFF signal requesting said wiper to remain in said parked state.
8. The wiper system of claim 7 , wherein said controller applies dynamic braking to said motor when said wiper is returned to said parked state from said use state in response to said OFF signal.
9. The wiper system of claim 1 , wherein said controller applies dynamic braking to said motor to prevent movement of said wiper from said parked state to said use state when said wiper is returned to said parked state from said use state.
10. The vehicle of claim 1 , wherein said controller applies dynamic braking to said motor to prevent movement of said wiper from said parked state to said use state when said wiper is returned to said parked state from said use state.
11. A vehicle comprising:
a wiper associated with a surface of the vehicle;
a motor operable to selectively move said wiper between a parked state and a use state relative to said surface;
a switch operable to generate a signal that identifies whether said wiper is in said parked state or said use state; and
a controller in communication with said switch and including a second-order filter and a comparator, said controller passing said signal through said second-order filter and said comparator to differentiate between said parked state and said use state.
12. The vehicle of claim 11 , wherein said switch includes a first plate, a second plate, and a conductive grease disposed between said first plate and said second plate.
13. The vehicle of claim 11 , wherein said controller passes said signal through said second-order filter and subsequently passes an output of said second-order filter through said comparator.
14. The vehicle of claim 11 , wherein said controller is a body controller of the vehicle.
15. The vehicle of claim 11 , further comprising a user-input switch selectively supplying said controller with a control signal to direct said wiper between said parked state and said use state.
16. The vehicle of claim 15 , wherein said controller identifies a state of said wiper based on an output of said comparator and controls said wiper based on said control signal.
17. The vehicle of claim 15 , wherein said control signal is one of an ON signal requesting movement of said wiper between said parked state and said use state and an OFF signal requesting said wiper to remain in said parked state.
18. The vehicle of claim 17 , wherein said controller applies dynamic braking to said motor when said wiper is returned to said parked state from said use state in response to said OFF signal.