Patent Application
20180354467
This disclosure relates to an exemplary apparatus and method of providing a pop-up washer nozzle with a defrost feature.
Vehicles can include a variety of cameras and sensors such as radar and infrared sensors, for example. In order for the cameras and sensors, to work properly, they need to be kept clean and free from dust, mud, or other types of debris. Keeping cameras and sensors clean is especially important for autonomous vehicle applications.
An apparatus according to an exemplary aspect of the present disclosure includes, among other things, a housing and a plunger moveable between a retracted position within the housing and an extended position to spray fluid on a vehicle component. A heater is mounted for movement with the plunger.
In a further non-limiting embodiment of the foregoing apparatus, the plunger includes a nozzle.
In a further non-limiting embodiment of either of the foregoing apparatus, the plunger includes a fluid inlet and a fluid outlet at the nozzle.
In a further non-limiting embodiment of any of the foregoing apparatus, the plunger includes an internal fluid channel extending from the fluid inlet to the fluid outlet, and wherein the heater is positioned to surround at least a portion of the internal fluid channel.
In a further non-limiting embodiment of any of the foregoing apparatus, the plunger includes a head at a distal end from the fluid inlet, and wherein the head is configured to be flush with a vehicle exterior surface when the plunger is in the retracted position.
In a further non-limiting embodiment of any of the foregoing apparatus, the vehicle component is a camera and/or a sensor.
In a further non-limiting embodiment of any of the foregoing apparatus, the apparatus includes a resilient member that biases the plunger to the retracted position.
In a further non-limiting embodiment of any of the foregoing apparatus, the heater comprises a heating element wire.
In a further non-limiting embodiment of any of the foregoing apparatus, the plunger includes a body having an internal flow path extending from a fluid inlet to a fluid outlet, and wherein the heating element wire surrounds at least a portion of the internal flow path.
In a further non-limiting embodiment of any of the foregoing apparatus, the plunger includes a body having an outlet tube positioned between a fluid inlet and a fluid outlet, and wherein the heating element wire is wrapped around the outlet tube.
In a further non-limiting embodiment of any of the foregoing apparatus, the housing includes a fluid inlet to supply washing fluid to a plunger fluid inlet, and wherein the plunger includes a fluid outlet comprising a nozzle.
An apparatus according to another exemplary aspect of the present disclosure includes, among other things, a housing and a plunger mounted within the housing. The plunger comprises a body having an internal channel extending between a fluid inlet and a nozzle at a fluid outlet. The plunger is moveable between a retracted position and an extended position to spray fluid out of the nozzle. A heater surrounds at least a portion of the internal channel.
In a further non-limiting embodiment of any of the foregoing apparatus, the heater comprises a heating element wire that surrounds the internal channel.
In a further non-limiting embodiment of any of the foregoing apparatus, the housing includes an inlet tube to supply washing fluid to the fluid inlet of the plunger, and including an outlet tube forming the internal channel, wherein the heater comprises a heating element that is wrapped around the outlet tube.
In a further non-limiting embodiment of any of the foregoing apparatus, the body has a foot at one end and a head at an opposite end, and including a resilient member positioned between the foot and the head to bias the plunger to the retracted position.
In a further non-limiting embodiment of any of the foregoing apparatus, the housing is enclosed at one end to define a fluid reservoir and is open at an opposite end to allow the head to extend outwardly of a vehicle exterior surface surrounding the opposite end of the housing, and wherein the head is generally flush with the vehicle exterior surface when in the retracted position.
In a further non-limiting embodiment of any of the foregoing apparatus, an autonomous vehicle provides the vehicle exterior surface, and wherein the nozzle is configured to spray fluid towards at least one of a vehicle camera and a sensor.
A method according to another exemplary aspect of the present disclosure includes the steps of, among other things: molding a heater element and a body having an internal channel extending between a fluid inlet and a fluid outlet together to form a plunger configured to spray fluid out of the fluid outlet.
In a further non-limiting embodiment of the foregoing method, the method includes molding connecting wires for the heater element and a nozzle at the fluid outlet as part of the plunger.
In a further non-limiting embodiment of either of the foregoing methods, the molding step comprises an insert molding process.
The embodiments, examples and alternatives of the preceding paragraphs, the claims, or the following description and drawings, including any of their various aspects or respective individual features, may be taken independently or in any combination. Features described in connection with one embodiment are applicable to all embodiments, unless such features are incompatible.
The various features and advantages of this disclosure will become apparent to those skilled in the art from the following detailed description. The drawings that accompany the detailed description can be briefly described as follows.
This disclosure details exemplary apparatus and methods of providing a pop-up washer nozzle with a defrost feature for a vehicle. These and other features are discussed in greater detail in the following paragraphs of this detailed description.
For vehicles such as autonomous vehicles, it is critical that the cameras 12 and sensors 14 remain clean. To ensure that surfaces of the cameras 12 and sensors 14 are free from debris, a pop-up washer nozzle 16 is mounted to the vehicle 10 at each camera and sensor location.
The plunger 30 comprises a body 38 within an internal channel 40 that extends from the fluid inlet 34 to the fluid outlet 36. Fluid can flow directly within the channel 40 or an outlet tube 42 (
The head 18 of the plunger 30 extends outwardly of the opening 28 in the housing 22 when the plunger 30 is moved to the deployed or active position. The housing 22 includes an inlet orifice or port 48 that is in fluid communication with a fluid supply 50. In one example, the fluid supply 50 includes washer or cleaning fluid. When activated, the fluid supply 50 delivers fluid to the housing 22 via an inlet tube 56 and starts to fill an area 52 between the first end 24 of the housing 22 and the foot 44 of the plunger 30. As pressurized fluid is pumped in, the pressure builds up and forces the plunger 30 to move up against the biasing force of the resilient member 46. The resilient member 46 compresses and the plunger 30 moves through the opening 28 in the housing 22 to the deployed position to clean the camera 12 or sensor 14 (
When subjected to cold operating conditions, the washing fluid within the pop-up washer nozzle 16 may freeze and not be able to be sprayed during a cleaning cycle. Additionally, the pop-up washer nozzle 16 can become covered with ice, which can cause the pop-up washer nozzle 16 to be stuck in the retracted position. The pressure force that moves the plunger 30 may not be high enough to break through the ice. This would result in the driver having to dislodge the ice so that the nozzle 16 can operate as intended. However, with autonomous vehicles there is no driver to remove the ice. Thus, the subject pop-up washer nozzle 16 includes a unique defrost feature to heat the fluid and to melt the ice.
In one example, the defrost feature comprises a heater 60 (
As discussed above, in another example, there is an outlet tube 42 that is molded within the plunger body 38 to form the internal channel 40. In this configuration, the heater wire element 62 wraps around the outlet tube 42 and has the connecting wires 64 attached. In this configuration, the nozzle 54 is attached to the outlet tube 42 at an outlet end. In one example, the outlet tube 42, wire elements 62, and nozzle 54 are all insert molded within the body 38 to form the plunger 30.
In one example, the housing 22 is made from glass filled nylon 6 and the plunger 30 is made from a high temperature polyether ether ketone (PEEK) material. PEEK is an organic thermoplastic polymer which can be used to incorporate a molded in heater 60. In one example, the nozzle 54 is also made from a PEEK material. In one example, the inlet tube 56 is made from a reinforced ethylene propylene diene monomer (M-class) rubber (EPDM rubber), and the outlet tube is made from a stainless steel.
In one example, the plunger 30 is injection molded from a high temperature liquid crystal polymer (LCP) that has been modified by adding highly conductive ceramic material. This type of material is effective as it can withstand continuous temperatures of 250 degrees Celsius. LCP is a good electrical and thermal insulator which is crucial to maintaining the desired high electrical resistivity required to ensure the heater 60 does not short out, while also significantly improving thermal conductivity of the material. This type of material also has high melt flow and can fill long and complex flow paths with minimal warpage. The material also has high mechanical strength, excellent dimensional stability and organic solvent resistance, as well as providing fast process cycling.
In one example, the LCP includes an additive of aluminum nitride (AIN) that is added in an amount of approximately 50% by weight or 22% by volume. Another example of an additive material is boron nitride. These additive materials provide a plastic material with significantly improved conductivity, which will allow the heat from the heater 60 to transfer across the entire surface of the plunger 30. It should be understood that while the disclosed materials are preferred, other similar and/or suitable materials could also be used.
As the heater 60 increases in temperature during activation, the thermally conductive plastic will heat the entire volume of the plunger 30 as shown in
The pop-up washer nozzles 16 for each of the cameras 12 and sensors 14 are activated and controlled via a system controller 66 (
The subject invention provides a pop-up washer nozzle that includes an internal heater that will prevent the nozzle from freezing during cold weather conditions. This is especially important for autonomous vehicles, which include multiple cameras, and sensors such as radar, Lidar NIR and infrared sensors. It is vital that cameras and sensors for autonomous vehicles stay clean and free from debris. When activated, the nozzle sprays washing fluid on the camera and/or sensor. The heater is activated below certain specified temperature levels to prevent fluid from freezing within the nozzle. The heater is also able to melt any ice that may build up over a head of the nozzle when retracted. The pop-up washer nozzle is retractable within the vehicle such that the nozzle is hidden from sight unless activated to provide an aesthetically pleasing appearance. In one example, the head 18 of the nozzle 16 includes a layer of material 68 (
Although the different non-limiting embodiments are illustrated as having specific components or steps, the embodiments of this disclosure are not limited to those particular combinations. It is possible to use some of the components or features from any of the non-limiting embodiments in combination with features or components from any of the other non-limiting embodiments.
It should be understood that like reference numerals identify corresponding or similar elements throughout the several drawings. It should be understood that although a particular component arrangement is disclosed and illustrated in these exemplary embodiments, other arrangements could also benefit from the teachings of this disclosure.
The foregoing description shall be interpreted as illustrative and not in any limiting sense. A worker of ordinary skill in the art would understand that certain modifications could come within the scope of this disclosure. For these reasons, the following claims should be studied to determine the true scope and content of this disclosure.
