Patent Application
20170334284
This disclosure relates generally to airflow control for motor vehicles. In particular, the disclosure relates to a deployable shade for altering exterior airflow supply to a vehicle engine compartment.
Airflow provided to a vehicle engine and/or cooling module as the vehicle is operated provides an effective and convenient means for engine cooling at lower speeds. However, as the speed at which a motor vehicle travels increases, airflow into the vehicle engine compartment may increase vehicle drag and therefore decrease fuel economy. To compensate for this, systems such as Active Grille Shutters (AGS) have been utilized. As is known, AGS typically comprise a series of pivoting shutter-style louvers attached to a vehicle body structure in front of the vehicle engine cooling module. These louvers may be oriented to allow maximum airflow through a grille opening and into the engine compartment to promote cooling as the vehicle is operated at low speeds, but which may be fully or partially closed at higher speeds to block airflow through the grille opening/into the engine compartment to reduce aerodynamic drag. At such higher speeds, reduced airflow into the engine compartment is adequate to provide the desired engine cooling function.
While effective, in conventional systems the AGS louvers are held in a substantially horizontal orientation when fully open and therefore increased packaging space is required to implement AGS in a vehicle. Moreover, the louvers and attendant actuation mechanisms add significant weight, potentially degrading vehicle fuel efficiency.
To solve this and other problems, the present disclosure relates to an active grille shade assembly for a vehicle, configured for vertical translation between a fully stowed and a fully deployed position. Because the active grille shade deploys and retracts vertically rather than rotating between a horizontal and a vertical orientation, less packaging space is required in the vehicle x-axis direction. Moreover, the described assembly provides significant weight savings compared to existing AGS systems, further improving fuel efficiency.
In accordance with the purposes and benefits described herein, in one aspect of the disclosure an active grille shade assembly for a vehicle is described, comprising a deployable flexible grille shade and one or more drive elements for translating the flexible grille shade between a deployed and a stowed position. A motor is operatively connected to the one or more drive elements.
In embodiments, a carrier carrying the deployable flexible grille shade is operatively connected to the one or more drive elements. One or more support struts for supporting the flexible grille shade when translated to the deployed position may be included. In embodiments, the one or more support struts are substantially vertically oriented.
One or more trolley slides configured for engaging a portion of the flexible grille shade and the one or more drive elements may be provided to effect translation of the grille shade between the deployed and retracted position. A lower drive shaft is included for engaging the one or more drive elements.
In embodiments, the assembly is carried by an upper frame rail, a lower frame rail, and a pair of opposed side rails. The pair of opposed side rails may be configured to slidingly receive at least a portion of the one or more drive elements, the one or more trolley slides, and the lower drive shaft in an interior channel thereof, thus reducing packaging space required for the assembly.
A controller is operatively connected to the motor and to one or more sensors. In embodiments, the one or more sensors are from one or more of an engine temperature sensor, a coolant temperature sensor, a vehicle-exterior ambient temperature sensor, a cooling module temperature sensor, and a vehicle speed sensor.
In the following description, there are shown and described embodiments of the disclosed active grille shade assembly. As it should be realized, the devices and systems are capable of other, different embodiments and their several details are capable of modification in various, obvious aspects all without departing from the devices as set forth and described in the following claims. Accordingly, the drawings and descriptions should be regarded as illustrative in nature and not as restrictive.
The accompanying drawing figures incorporated herein and forming a part of the specification, illustrate several aspects of the disclosed active grille shade assembly, and together with the description serve to explain certain principles thereof. In the drawings:
Reference will now be made in detail to embodiments of the disclosed active grille shade assembly, examples of which are illustrated in the accompanying drawing figures.
With reference to
The active grille shade assembly 102 is shown in detail in
The top frame member 114 may include a slot (not visible in this view) through which the grille shade 110 passes. Optionally, the grille shade 110 slot may include an integral or attached cleaning element for cleaning the grille shade 110 during deployment and/or retraction to remove insects, dust, mud, debris, etc. that may have accumulated on the shade during vehicle operation. In an embodiment, the cleaning element is provided by one or more brushes disposed adjacent to the grille shade slot 110 and extending all or a portion of a width dimension of the slot.
The active grille shade assembly 102 further includes one or more drive elements for translating the grille shade 110 vertically between the fully retracted and fully deployed positions. In the depicted embodiments, a pair of drive elements 120a, 120b are provided, at least a portion of each of which is received in an extrusion or internal channel 122 defined in the opposed side frame members 118a, 118b. As will be appreciated, this reduces packaging space required for the active grille shade assembly 102. The drive elements 120a, 120b may in various embodiments be composite belts, chains, or other suitable elements.
In the depicted embodiment, the drive elements 120a, 120b are rotatably carried at a first end by a portion of the carrier 108, whereby rotation of the carrier causes the drive elements to move. A motor assembly 124 is operatively connected to the carrier 108 whereby operation of the motor rotates the carrier to deploy or retract the grille shade 110 as will be described. In alternative embodiments, the motor 124 may be directly operatively connected to gearing (not shown) driving the drive elements 120a, 120b.
As depicted, a motor 124 is provided selectively allowing clockwise and counter-clockwise rotation of the carrier to deploy or retract the grille shade 110. In embodiments, the motor may be a stepper motor of known design which rotates the carrier 108 and/or the drive elements 120a, 120b over a finite number of positions or degree increments, or may not include such restrictions on the degree through which the motor will rotate the carrier. The motor 124 may include a grille shade 110 position sensor (not shown) for determining a position of the grille shade, i.e. fully retracted, fully deployed, or at one or more intermediate positions.
The drive elements 120a, 120b are rotatably carried at a second, opposed end by a drive shaft 126, a portion of opposed ends of which include bearings (not shown) and are received in/attached to the opposed side frame member internal channels 122. One or more support struts 128, in the depicted embodiment being substantially vertically oriented rods, are provided attached at a first end to the upper frame member 114 and at a second, opposed end to the lower frame member 116. As will be appreciated, the support struts 128 provide support to the flexible grille shade 110 when in the partially or fully deployed position.
The active grille shade assembly 102 further includes at least one trolley slide 130, configured for engaging spaced apertures 132 in the drive elements 120a, 120b such as by friction fit pins 134 (see
The active grille shade assembly 102 may be operatively connected to a variety of sensors and vehicle controllers and control modules. By way of non-limiting example,
In an embodiment, the control module 140 may be the vehicle's powertrain control module (“PCM”), which may communicate directly with the motor 124. Alternatively, the control module 140 may communicate with the motor 124 indirectly via a second or third control module communicating with the control module 140 via a vehicle controller area network (CAN), for example, a LIN bus. In the embodiment shown in
The active grille shade system 102 may further include one or more sensors which provide inputs to the control module 140. As examples, the control module 140 may be in direct or indirect communication with a sensor array including one or more of an engine temperature sensor 144, a coolant temperature sensor 146, a cooling module temperature sensor 148, a vehicle-exterior ambient temperature sensor 150, and a vehicle speed sensor 152. As will be appreciated, the sensors provide input relating to temperature and/or vehicle speed, which the control module interprets to select a predetermined grille shade 110 deployment position. This can be accomplished by any number of methods, for example by a simple lookup table stored in the control module 140 or controller 138 memory.
The lookup table may include various temperatures or ranges of temperature for vehicle engine components, and various vehicle speeds or ranges of speeds. Thus, as non-limiting examples, at speeds below 15 mph and/or ambient temperatures of 96° F. or more, the control module 140 may cause the grille shade 110 to fully retract, whereas at speeds of 45 mph or more and/or ambient temperatures of 32° F. or less, the control module 140 may cause the grille shade 110 to fully deploy. Likewise, if the cooling module temperature sensor 148 indicates a temperature of 212° F. or more, the control module 140 may cause the grille shade 110 to fully retract to maximize cooling airflow to the engine compartment 107. Again, as discussed above any number of intermediate deployment positions, all tied to particular vehicle component and/or ambient temperatures and vehicle speeds, are contemplated. Moreover, the skilled artisan will readily appreciate that the above speed and temperature values are representative only, and that particular control module 140 settings may be implemented according to vehicle configuration, intended vehicle use and use conditions, etc.
Thus, by the above-described structures and mechanisms, a similar functionality is provided as that of an AGS system, that is, aerodynamic closure of open engine cooling module cores (radiator, A/C condenser, and other coolers). By the described active grille shade assembly 102, exterior airflow to the engine compartment 107 can be restricted, for example at higher vehicle speeds and/or when situations imposing reduced engine cooling requirements are encountered. The system is simple, robust, and efficient, and provides a significant weight savings over traditional AGS systems.
Still more, an added functionality of the assembly 102 is that the grille shade 110 may be deployed as needed in cold weather even if vehicle speed and cooling module temperatures do not dictate so. For example, consider the situation where the ambient temperature sensor 150 provides an input to the control module 140 that an exterior temperature is sufficiently low (as a non-limiting example, 32° F. or less) to require increased engine warm-up times. Here, even though the vehicle speed is not sufficient and/or the various vehicle component temperature sensors described above would not indicate increased engine, cooling module, coolant, etc. temperatures requiring retraction or deployment of a conventional AGS system tied to vehicle speed and/or vehicle component temperature sensors, the control module 140 can be configured to fully or partially deploy the grille shade according to sensor-provided ambient temperature readings to aid in coolant temperature regulation and in reducing cold weather engine warm-up time.
Obvious modifications and variations are possible in light of the above teachings. For example, rather than the rollup style shade described above, the grille shade 110 could be provided in alternative configurations, for example in a folding “Roman shade” design while still minimizing packaging space required for the active grille shade assembly 102. Likewise, rather than driving the carrier 108, the motor 124 could be configured to directly or indirectly drive the lower drive shaft 126 to then drive the drive elements 120a, 120b. All such modifications and variations are within the scope of the appended claims when interpreted in accordance with the breadth to which they are fairly, legally and equitably entitled.
